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CB31MV - CozyParts.com

1. ARRANGEMENT 9 EY HE2 52 2 HE gt P e O 32 2 99 5 5 K33 69 gt SX gt K33 7 40A 30A OO DESCRIPTION KEY COMPONENT CBI 2 CIRCUIT BREAKER ELECTRIC HEAT HET 2 ELEMENT ELECTRIC HEAT E P2 PLUG ELECTRIC HEAT L 5 K32 1 2 RELAY SEQUENCER ELECTRIC HEAT K33 1 RELAY SEQUENCER ELECTRIC HEAT 515 ISWITCH LIMIT PRIMARY AUTO RESET 520 ISWITCH LIMIT SECONDARY L INE VOLTAGE FIELD INSTALLED lt DENOTES OPTIONAL COMPONENTS A i 2 22 T gt L2 0 6 L2 A M A CIRCUIT 2 2 E EQUIPMENT G GROUND N CONNECT POWER WIRES FROM UNT LABELED LI AND L2 TO TB2 TERMINAL STRIP ON HEATER PLATE REFER TO UNIT PROTECTION SIZE EQUIPMENT GROUND IS LOCATED IN INDOOR UNIT OTE USE COPPER HE2 N CONDUCTORS ONLY LENNOX sies me WIRING DIAGRAM 11 95 HEATING UNITS ELECTRIC 51 10 1 Supersedes Form New Form No 551 765W 1995 Lennox Industries Inc Litho U S A FIGURE 36 C ECB31 10 10CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 When there is call for heat W1 of the thermostat ener gizes the electric heat relay K32 with 24VAC When K32 1 closes the blo
2. Page 14 29 5 5 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT VESTIBULE PANEL ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT CIRCUIT BREAKER SEQUENCER RELAY K32 CB1 FIGURE 7 ECB29 8 8CB AND ECB31 10 10CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ECB29 8 CIRCUIT BREAKER CB1 ELECTRIC HEAT VESTIBULE PANEL ELECTRIC HEAT ELEMENT HE2 ELECTRIC HEAT ELEMENT HE1 ECB31 10 CIRCUIT BREAKERS CB2 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT ELECTRIC HEAT SEQUENCER RELAY K33 SEQUENCER RELAY K32 FIGURE 8 Page 15 ECB29 8 10 208 230 THREE PHASE ECB29 12 5CB 15CB 208 230 SINGLE amp THREE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT ELECTRIC HEAT VESTIBULE PANEL SEQUENCER RELAY 33 CIRCUIT BREAKER TERMINAL BLOCK TB2 PRIMARY LIMIT S15 CB2 FIGURE 9 ECB31 20CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT ELECTRIC HEAT SEQUENCER RELAY K33 VESTIBULE PANEL PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 CIRCUIT CIRCUIT BREAKER BREAKER CB1 CB2 ELECTRIC HEAT SEQUENCER RELAY K34 FIGURE 10 Page 16 amp SECONDARY LIMIT S20 2K PSS
3. 3 Pins Jumpered Motor runs at 50 for 1 2 minute Motor then runs at 82 for approximately 7 1 2 min utes If demand has not been satisfied after 7 1 2 min utes C Motor runs at 10096 until demand is satisfied D Once demand is met motor ramps down to off D 7 1 2 MIN 82 100 p gt 1 2 MIN 50 COOLING DEMAND 4 Pins Jumpered A Motor runs at 50 for 30 seconds B Motor then runs at 82 for approximately 7 1 2 min utes If demand has not been satisfied after 7 1 2 min utes C Motor runs at 100 until demand is satisfied D Once demand is met motor runs at 50 for 30 seconds then E Motor ramps down to stop C 7 1 2 MIN 82 100 1 2 MIN 50 COOLING DEMAND CB31MV units built February 2003 and later 1 Pins Jumpered A Motor runs at 100 until demand is satisfied B Once demand is met motor ramps down to stop OFF 100 CFM OFF ft DEMAND 2 Pins Jumpered A Motor runs at 100 until demand is satisfied B Once demand is met motor runs at 100 for 45 sec onds C Motor ramps down to stop A B 100 4 100 CFM OFF 45 seconds OFF e COOLING DEMAND CB31MV units date coded prior to 2 2006 will delay 60 seconds 3 Pins Jumpered A Motor runs at 8296 for approximately 7 1 2 minutes If demand has not been
4. N ELEMENT HE1 ELECTRIC HEAT ELEMENT HE3 ELECTRIC HEAT ELEMENT HE2 ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 ELECTRIC HEAT SEQUENCER RELAY K32 ELECTRIC HEAT ELEMENT HE4 ELECTRIC HEAT ELEMENT HE3 _ ELEMENT HE2 PRIMARY LIMIT 15 amp SECONDARY LIMIT S20 ELECTRIC HEAT SEQUENCER RELAY K32 ECB29 20CB 25CB 208 230 THREE PHASE ELECTRIC HEAT ECB29 25CB 208 230 SINGLE PHASE 2 909890 HE2 ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT lt ELEMENT ELECTRIC HEAT ELECTRIC HEAT lt ELEMENT HE4 SEQUENCER RELAY K33 ELECTRIC HEAT VESTIBULE PANEL PRIMARY LIMIT S15 8 SECONDARY LIMIT 520 SS CIRCUIT BREAKER X SIZ V 115537 ELECTRIC HEAT CB2 ELEMENT HE3 CIRCUIT BREAKER PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 ELECTRIC HEAT SEQUENCER RELAY K32 ELECTRIC HEAT SEQUENCER RELAY K35 ELECTRIC HEAT SEQUENCER RELAY K34 ELECTRIC HEAT SEQUENCER RELAY K116 CIRCUIT BREAKER CB3 FIGURE 11 Page 17 V OPTIONAL HUMIDITY CONTROL 20 EfficiencyPlus PARTS IDENTIFICATION lt BASE SECTION CONTROL WIRE ENTRY TERMINAL BLOCK a4 INDICATING LIGHTS HINGES HUMIDITY SENSOR SLIDE ON CIRCUIT BOARD COVER VERTICAL SLIDE 2 control setpoint NOTE TO REMOVE COVER HOLD BASE SECTIO
5. To produce drier air the CB31MV will slow down the speed of the air crossing the indoor coil Because the air is moving much slower than normal the indoor coil is allowed more time to remove moisture from the air a higher percentage of the air passing over the coil is cooled to its dew point re moving more moisture At the same time the two stage outdoor unit will switch to high speed to produce a colder indoor coil The colder indoor coil and slower moving air combine to produce drier supply air NOTE The indoor blower speed is reduced in order to slow the air speed across the indoor coil The supply air exiting the unit may not feel as forceful This is normal Remember that when the unit is in dehumidification mode the comfort level is increased because the unit is producing cooler drier air The exact sequence of operation to produce cooler drier air is described in the following section Other Conditions Which Adversely Affect SignaturetStat Performance Blower speed selection can adversely affect SignatureStat performance Higher blower speeds should be selected to provide maximum sensible cooling while lower blower speeds should be selected to provide maximum humidity removal Refer to CB31MV and SignatureStat installation instructions It is recommended that the indoor blower be left in AUTO mode at all times During dehumidification mode the in door coil and drain pan may become saturated with mois ture If the
6. gt 3 35 000 10 3 36 000 10 5 37 000 10 8 ECB31 10 ECB31 10CB fA FUE prse Output Btuh KW ECB29 12 5CB Capacity i hase TA FU E Output Btuh kW ECB29 15CB TA FU E 70 000 20 5 70 000 20 5 71 000 20 8 Output Btuh kW ECB31 20CB 100 100 100 Output Btuh kW 87 000 25 5 88 000 25 8 29 25 TAnnual Fuel Utilization Efficiency based U S DOE test procedures and according to labeling regulations TTDisposable frame type filter Includes additional blower motor heat capacity 100 100 100 44 000 12 9 45 000 13 2 46 000 13 5 100 100 100 52 000 15 2 53 000 15 5 54 000 15 8 100 100 100 Page 2 CB31MV PARTS ARRANGEMENT ELECTRIC HEAT SECTION CONTROL BOX BLOWER COMPARTMENT BLOWER ACCESS PANEL HORIZONTAL DRAIN PAN COIL COIL ACCESS PANEL CHECK AND EXPANSION VALVE COMPLETE WITH SCREEN UPFLOW DOWNFLOW DRAIN PAN FIGURE 1 CB31MV CONTROL BOX LARGE ELECTRIC HEAT SMALL ELECTRIC HEAT ADDITIONAL KNOCK WE TERMINAL OUT FOR ide 20 30 kW RELAY 20 STRIP TB1 9 TRANSFORMER BDC3 BLOWER CONTROL A15 TERMINAL STRIP GROUNDING TB2 LUGS FIGURE 2 Page 3 I APPLICATION All major blower coil c
7. LENNOX Service Literature YNITINFORMATION CB31MV Corp 9618 L9 Revised 02 2006 CB31MV SERIES UNIT INCLUDING ECB29 31 ELECTRIC HEAT The CB31MV is a high efficiency residential split system blow er coil featuring a variable speed motor VSM controlled by an electronic blower drive control CB31MV series units are designed to be matched with Lennox two speed or single speed condensing units and heat pumps Several models are available in sizes ranging from 3 through 5 tons All units are equipped with factory installed check and ex pansion valve for cooling or heat pump applications ECB29 31 electric heat is available in several voltages and kW sizes and can be field installed in the cabinets Some CB31MV applications may include the optional Effi ciency Plus Comfort Management Control CCB1 The control is installed indoors adjacent to the indoor thermo stat Its purpose is to vary indoor blower speed in response to indoor dehumidification demand When a two speed outdoor unit is used compressor speed can also be con trolled by the CCB1 in response to indoor dehumidification demand The CCB1 can control the compressor speed only if there is a demand for cooling from the indoor thermo stat Information contained in this manual is intended for use by experienced HVAC service technicians only All specifica tions are subject to change Procedures outlined in this manual are presented as a recommendation
8. 5 EQUIPMENT GROUND ECB29 15CB 1Y Li CIRCUIT 2 EA L2 a ON EQUIPMENT IN GROUND OO 1 z USE 60 BREAKER ON ECB29 15CB UNITS FOR COMPLETE CIRCUIT USE DIAGRAM FOR THE Ne ECB29 5 8 amp 10 1Y d HE2 NOTE USE COPPER CONDUCTORS ONLY 11 95 12 95 J LENNOX 5 Inc TB2 USED ON HEATING UNITS E 5 8 4 10KW HEATERS ONLY CB USED ON I5KW HEATER ONLY WIRING DIAGRAM ECTRIC 29 5 8 10 1 ECB29 15CB I Y EQUIPMENT GROUND LOCATED IN INDOOR UNIT Supersedes Form No New Form No 531 706W 1995 Lennox Industries Inc FIGURE 40 Litho U S A G ECB29 8 10 15CB 208 230V THREE PHASE SEQUENCE OF OPERATION When there is a call for heat W1 of the thermostat energizes the electric heat relays K32 and K33 with 24VAC When K32 1 and or K33 1 closes the blower is energized on heating speed and economizer heat relay K20 2 is energized see unit schematic figure 26 When K32 1 K32 2 and K33 2 closes assuming the N C primary 815 and secondary S20 limit switches are closed electric heat elements HE1 HE2 and HE3 are energized Page 38 CIRCUIT
9. SECOND STAGE HEAT remove jumper between W2 and R 4 When K34 1 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relays K33 and K116 with 24VAC THIRD STAGE HEAT remove jumper between W3 R if using third stage 7T When K34 2 closes the unit is ready for a third stage heat demand W3 if available of the thermostat sends a third stage heat demand energizing the electric heat relay K35 with 24VAC 8 When K35 1 and K35 2 close assuming the N C primary 815 and secondary 20 limit switches are closed electric heat elements HE4 and HE5 are energized Page 37 ARRANGEMENT O OR TB2 L2 4 DESCRIPTION COMPONENT CIRCUIT BREAKER ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY TERMINAL BLOCK ELECTRIC HEAT 2 CONNECT WIRES FROM NHEATER LABLED LI L2 L3 TO TB2 TERMINAL STRIP INSIDE INDOOR UNIT LINE VOLTAGE FIELD INSTALLED lt DENOTES OPTIONAL COMPONENTS 73 ne REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE CIRCUIT
10. 29 20 11131 4steps 208 150 51 200 43 47 41 50 60 19168 20 220 168 57300 43 52 46 60 60 1 50A 8 1 60A Circuit breaker 230 184 62700 43 52 46 60 60 240 200 68 200 43 52 46 60 60 THREE PHASE ELECTRIC HEAT CB31MV 41 8 kW ECB29 8 28K42 3steps 208 60 20500 43 26 m 30 NE 5 Ibs Terminal Block 220 6 7 22 900 4 3 29 30 D 280 73 25100 43 29 30 240 80 27300 43 29 30 ees 10 kW ECB29 10 28K43 3 steps 208 75 25 600 43 31 EN 35 ms 6 Ibs Terminal Block 220 8 4 28 700 4 3 35 sw 35 DR 280 92 31400 43 35 35 240 100 34100 43 35 35 15 kW 29 15 28 44 208 11 3 38400 4 3 44 PEN 745 12 Ibs 50A Circuit breaker 220 12 6 43000 43 50 50 DK 230 135 47 000 43 50 50 240 150 51200 43 50 50 Jeg 20 kW ECB29 20CB 28K45 Gsteps 208 15 0 51200 43 31 21 35 730 19 Ibs 2 35A Circuit breaker 220 16 8 57 300 43 35 24 35 35 230 184 62 700 43 35 24 35 35 240 200 68200 43 35 24 35 35 T Electric heater capacity only does not include additional blower motor heat capacity 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted See Optional Circuit Breaker table for catalog numbers NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full
11. 655 JUMPER TO 0 IS USED WITH CONDENSING BLACK gt UNIT REMOVE R TO O JUMPER WHEN HEAT 4 8 io PUMP 15 USED lt 5 REMOVE JUMPER BETWEEN DS AND YI WHEN 5 9 HUMIDITY CONTROL CCBI A20 IS USED L2 ORANGE JUMPER YI TO Y2 IS FOR SINGLE STAGE COOLING gt gt Q 42 REMOVE JUMPER YI TO Y2 FOR TWO STAGE COOLING K20 CB8 USED ON 51 AND 65 UNITS ONLY 9 COMMON BLACK V ORANGE o 5 m 212 gt 3 3 BLOWER SPEED TAP SELECTION olo o 2 o ele 252 F SPEED SELECTION COOL CONDENS 2 ASS BLOWER CONDENS HEAT ING UNIT PUNE WITH 866666 26 8 COIL ING UNIT PUMP WITH gt ELECTRIC a HEAT ONLY 52 LENNOXe coi s BLOWER COIL UNITS COOL COOL HEAT HEAT E 4 4 Pas 41 PIN 3 PIN 3 PIN CB31MV 51 65 2 P CB31MV 41 3 P COOL COOL HEAT HEAT 5I PIN 2 PIN 2 PIN 1 PIN COIL SECTION 1B46 5 upersedes 65 COOL COOL HEAT HEAT PIN 35 PIN 3 PIN 1 PIN 05041534 301W MINIMUM SETTING FOR HEAT eu LINE VOLTAGE FIELD WIRING 534 767W CLASS VOLTAGE FIELD WIRING 2004 Lennox Industries Inc Litho U S A FIGURE 34 A CB31MV 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 Line voltage is routed to transformer T1 and blower 4 Blower motor B3 is energized on heating speed after motor B3 K20
12. 8 9 5 eem oo Evaporator Coil Fins per inch fins per m 12 472 12 472 12 472 Suct vapor line conn in mm sweat 3 4 19 7 8 22 2 1 1 8 28 Liquid line in mm sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate drain connection fpt in 2 3 4 19 2 3 4 19 2 3 4 19 Nominal cooling capacity tons kW 3 10 6 4 14 1 5 17 6 Refrigerant HCFC 22 10 x 8 12 x 9 12 x 9 Blower wheel nominal diameter x width in mm 254 x 203 305 x 229 305 x 229 Blower motor output W 1 2 373 1 746 1 746 5 3 1 20 x 20 x 1 1 20 x 24 x 1 ttNumber and size of filters 1 508 x 508 x 25 1 508 x 610 x 25 Electrical characteristics GOhz 208 230v 1ph Shipping weight Ibs kg 1 package 183 83 212 96 212 96 Optional Accessories Must Be Ordered Extra Side Return Unit Stand Up Flow Only Shipping weight Ibs kg 45 2 6 3 Wall Hanging Bracket Kit Up Flow Only Shipping wt Ibs kg 45K30 3 1 Down Flow Combustible Base Shipping weight Ibs kg 34J73 8 4 e E 5 UD gt 3 18 000 5 3 18 000 5 3 18 000 5 3 ECB29 5 ECB29 5CB 100 100 100 e E 5 Z S U gt 3 29 000 8 5 29 000 8 5 30 000 8 8 ECB29 8 ECB29 8CB 100 100 100 e E 5 Ww Q gt
13. C limits with the ECB31 10CB 1 P 40 30 AMP primary limit being an auto reset limit and the secondary 25 50 AMP limit being a one time limit One time limits must be re placed when opened The limits are factory set and are not 29 15 1 P 30 AMP 60 AMP ECB31 20CB 1 P 40 AMP 30 AMP 5682525051 P 50 AMP 50 AMP 50 AMP 208 230 Volt Electric Heat Sections ECB29 30CB 1 60 AMP 60AMP 60 1 515 amp Secondary S20 Temperature Limits adjustable Each stage of the 208 230 electric heat is protected 60AMP gt by a primary 515 and secondary 520 high temper 40 _ 35AMP ature limit Both S15 and S20 are located in the same 50 AMP 35 AMP housing Each stage uses the same style of limits Both the primary and secondary limits are wired in series with a heat element When either 515 S20 opens the corre sponding heat element is de energized All other 4 Terminal Strip TB2 208 230 volt only Note Do not remove patch plate or insulation on units without circuit breakers heating elements remain energized The primary high temperature limit opens at 150 F 5 F 65 5 2 8 on a temperature rise and automatically resets at 110 F 9 F 43 3 5 0 on a temperature fall The secondary high temperature limit opens at 333 F 10 F 167 2 C 5 6 C on a
14. Y1 to Y2 See table 12 Two Speed Heat Pump 13 CB31MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITHOUT CCB1 WITHOUT SIGNATURESTAT WITH HARMONY UNIT JUMPERS SEQUENCE OPERATION Sinale or Two Speed Harmony controls blower speed according to size g vo Spe O to R of demand through pulse width modulated signal Condensing Unit to DS Single or Two Speed Harmony controls blower speed according to size g p NONE of demand through pulse width modulated signal Heat Pump to DS NOTE If using Harmony kit locate blower relay K20 and remove and tape off any one of four wires CAUTION HIGH VOLT AGE NOTE Continuous fan CFM will be 50 of COOL speed Blower will run on HEAT speed during Heat operation Reduced blower speed is 70 COOL for ALL model units manufactured August 2002 and later Reduced blower speed is 65 of COOL for the 036 UNITS 60 of COOL for 048 and 060 series units manufactured prior to August 2002 1 CB31MV units manufactured January 2002 and later will have factory installed jumpers Remove jumpers not used Page 32 ARRANGEMENT Q O CB OR TB DESCRIPTION KW 5 COMPONENT CIRCUIT BREAKER ELECTRIC HEAT 8 ELEMENT ELECTRIC HEAT FOR USE WIT PLUG ELECTRIC HEAT CIRCUIT BREAKERS L gt RELAY SEQUENCER ELECTRIC HEAT ONLY SWITCH LIMIT PRIMARY AUTO RESET VOLTAGE FIELD INSTALLED TE
15. and G Y1 and Y2 if available are on Note that H is inactive off during dehu midification The D terminal controls dehumidification When a dehumidification demand is present the D terminal becomes de energized Otherwise 24VAC is present in off mode and heating mode unless there is a call for dehumidi fication Tables 12 and 13 show system response to Signa tureStat demand Dehumidify Mode Screen NOTE Basic or Precision mode must be turned on before you can adjust the dehumidify level on the SignatureStat 1 From the home screen press MENU 2 Use the UP or DOWN button to highlight DEHUMIDIFY See figure 14 Setting Humidity Levels MAIN MENU PROGRAM HEAT COOL HUMIDIFY DEHUMIDIFY HOME SELECT FIGURE 14 3 Press SELECT to choose MODE Setting Humidity Levels HUMIDIFY MENU MODE OFF DEHUMIDIFY 45 MAIN MENU SELECT FIGURE 15 4 To turn off dehumidification control entirely select OFF The default setting for dehumidification is OFF To turn on basic dehumidification mode select BASIC To turn on precision dehumidification mode select PRECISION See figure 16 Setting Dehumidify Mode HUMIDIFY MODE BASIC PRECISION HUM MENU SELECT FIGURE 16 5 The Humidity Menu appears Basic BAS is displayed on the right hand of the screen Now you can program the dehumidity percentage that you want Setting Dehumidity Levels HUMIDIFY MENU MODE BAS DE
16. i5 ao Ue P L2 lt lt EQUIPMENT Ave Aum EQUIPMENT EQUIPMENT EQUIPMENT A GROUND 1 E CONNECT POWER VIRES FROM HEATER LABELED LI AX LOCATED IN INDOOR THE NUMBER OF CIRCUITS VARY ior pcm m oq bd UNITS TO TB2 TERMINAL L3 15 n PRESENT ON UNITS TO TERMINAL P ELECTRIC HEATERS FOR ACTUAL NUMBER EMPLOYED J2 gt _ 24V POWER 4 15 R N 2 a DS gt b Q 20 DESCRIPTION g ECON KEY COMPONENT 3 20 2 ATS CONTROL BLOWER DRIVE a BLOWER Y 6 B3 MOTOR BLOWER G U AKER TRANS AUX HEAT LT EL FUSE TRANSFORMER J JACK ELECT HEAT AUX HEAT 2 2 546 JACK QUIPUT A hz 448 JACK MOTOR VAR SPD J49 JACK MOTOR VAR SPD K20 ZIRELAY BLOWER FI 2 P46 PLUG OUTPUT COOL HEAT 2 848 PLUG MOTOR VAR SPD 2 845 PLUG MOTOR VAR SPD 4 GK REV VALVE o TI TRANSFORMER CONTROL TBI TERM STRIP CLASS II p 3 COOL HEAT YI n P REFER TO FACTORY BLOWER SPEED TAP SELECTION gt CHART BELOW BLOWER SPEED INFORMATION 3 85 USE COPPER CONDUCTORS ONLY REFER TO UNIT ZIS gt NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY EQUIP 5 9 AND MAXIMUM OVERCURRENT PROTECTION SIZE GROUND D gt NOTE FOR NON HEAT PUMP APPLICATION ONLY 65 WHEN TWO STAGE THERMOSTAT IS USED SECOND STAGE HEAT BULB TO TERMINAL W2 AND oo SALT 5 DSe REMOVE JUMPER BETWEEN TERMINALS R amp W2 2
17. indoor blower is left in ON mode much of that moisture can be re evaporated into the living space be tween thermostat demands This can create a constant de mand for humidity removal and may cause extended com pressor run times Refer to table 8 for jumpers per application CB31MV units manufactured January 2002 and later will have factory installed jumpers Remove jumpers not used TABLE 8 JUMPERS REQUIRED Single Speed Heat Pump Two Speed DS to Y1 Prud DS to Y1 and OFF Single Speed Y1 to Y2 and Condensing Oto R Unit Control Single Speed Y1 to Y2 and ON Condensing Oto R Unit Humidity Page 20 Operation Dehumidification is provided only when the thermostat is in cool mode Dehumidification D terminal wires to variable speed blower reverse logic active on low signal 24VAC When the unit is in heating mode the dehumidification func tion is off The default mode for dehumidification is OFF and needs to be activated during installation The D terminal is active whenever the SignatureStat is pow ered EXCEPT when there is a dehumidification demand This means that the D terminal has 24V on it even in HEAT and OFF modes Basic Mode Dehumidification only with a cooling demand COOL is on then D is active reverse logic off and G is on if not already on Y1 and Y2 if available is on Precision Mode Dehumidification with or without Cooling demand D is active reverse logic off
18. over setpoint 1 cooling after call for humidity removal Reduced blower speed dehumidification speed begins imme diately with thermostat demand Slightly over setpoint 1 If humidity increases significantly over setpoint or if slide switch is moved unit immediately goes into dehumidification mode in presence of thermostat de mand While unit is not operating no thermo stat demand slide switch is moved down and back up Blower and com pressor operate at high speed until next thermostat demand Significantly over setpoint 2 or more Significantly over setpoint 2 or more Call for cooling after significant increase in humidity 60 65 of COOL Over setpoint 1 or more Change to Acceptable None Humidity demand sat isfied between thermo stat demands unit off cycle Note When changing unit mode of operation from cooling to heating indicating lights that are on will stay on until the first thermostat heating demand IMPORTANT If power to unit is turned on with CCB1 calling for humidity removal outdoor unit may be locked into high speed indefinitely To reset move humidity slide switch all the way down then back up to desired setpoint with unit running Reduced blower speed is 65 of COOL for the 41 units 60 of COOL for 51 and 65 series units f the two speed control on a two speed outdoor unit is set for LATCH 2 15 minutes or LATCH 3 30
19. pressor and indoor blower on low speed Increased cooling demand energizes the compressor and indoor blower on high speed The control is equipped with a row of orange LED lights on its face which indicate the amount of relative humidity de mand present When one or more LEDs are lit the control signals the CB31MV to begin dehumidification mode Tables 10 and 11 show system response to thermostat and CCB1 demand Page 18 Calibration Precautions Extreme care should be taken to avoid exposing the CCB1 to fumes from household chemicals The humidity sensing element in the CCB1 is a precise component which can be damaged or the calibration changed by household chemi cals and cleaning agents Make sure all household chemi cals are stored in a different room in the building Also use only mild diluted soapy water when cleaning the CCB1 cov er or the area surrounding the CCB1 The sensing element cannot be field calibrated The CCB1 contains no field re pairable parts and must be replaced when damaged in this manner Agents which can damage the CCB1 include alcohol ben zene chlorine and chlorine based solutions acetone nail polish remover bug sprays and other household cleaners Calibration can also be adversely affected by the place ment of the CCB1 with respect to the indoor thermostat ex terior doors and windows and supply air registers Most thermostats have anticipation resistors which give off heat If the CCB1 is inst
20. primary 815 and secondary 20 limit switches are closed electric heat elements HE1 and HE3 are energized When K33 2 closes assuming the N C primary S15 and secondary 20 limit switches are closed electric heat element HE4 is energized remove jumper between W2 and R 5 When K33 1 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relay K34 with 24VAC When K34 1 closes the blower if not energized is ener gized on heating speed and economizer heat relay K43 is energized see 208 230VAC CB schematic When K34 2 closes assuming the N C primary 815 and secondary S20 limit switches are closed electric heat element HE2 is energized Page 36 ARRANGEMENT CB3 oo DESCRIPTION COMPONENT CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER ELECTRIC HEAT JELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT 2 RELAY SEQUENCER ELECTRIC HEAT 2 RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO SWITCH LIMIT SECONDARY CIRCUIT 3 A CIRCUIT 2 LI D C
21. satisfied after 7 1 2 minutes B Motor runs at 10096 until demand is satisfied C Once demand is met motor ramps down to stop B C 7 1 2 MIN 82 COOLING DEMAND lt t 100 OFF OFF 4 Pins Jumpered Motor runs at 50 for 30 seconds B Motor then runs at 82 for approximately 7 1 2 min utes If demand has not been satisfied after 7 1 2 min utes C Motor runs at 100 until demand is satisfied D Once demand is met motor runs at 50 for 30 sec onds E Motor ramps down to stop C 7 1 2 MIN 82 CFM 100 CFM OFF 1 2 MIN 50 CFM COOLING DEMAND Page 7 lll Troubleshooting The VSM DO e Check motor controls wiring and connections thoroughly before replacing e Use proper replacement parts for motor and control model numbers e Keep duct static to a minimum e Size equipment properly 9 Check orientation before inserting motor connector DON T Automatically assume the motor is bad e Locate connectors above 7 and 4 o clock positions e Replace a control or motor number with unauthorized replacement e Use high pressure drop filters 9 Use restricted returns 9 Oversize systems then compensate with low airflow MOISTURE CHECK Connectors should point downward 9 Arrange harness with drip loop under motor 9 Check condensate drain plug e Check for airflow too much latent capacity e Ch
22. sticker located on the filter access door specifying the size of the standard throw away filter which is used with the unit TABLE 14 CB31MV FILTER SIZES 25 20 X 20 CB31MV 41 508 X 508mm 20 X 24 CB31MV 51 65 508 X 610mm B Supply Air Blower 1 Check and clean blower wheel 2 Motors are prelubricated for extended life no further lu brication is required C Electrical 1 Check all wiring for loose connections 2 Check circuit breaker located in unit control box 3 Check for correct voltage at unit unit operating 4 Check amp draw using a True RMS ampmeter Typical clamp on ammeters do not read current accurately Motor Nameplate Actual 5 Check to see that heat if applicable is operating D Insulation Outdoor piping insulation should be inspected yearly for deteri oration If necessary replace with same materials Page 30 X WIRING SCHEMATIC AND OPERATION SEQUENCE FIELD WIRING FOR UNITS FIELD WIRING FOR WITHOUT CIRCUIT BREAKERS UNITS WITH CIRCUIT BREAKERS CIRCUIT 4 CIRCUIT 3 CIRCUIT 2 PS 2 fe A A A A
23. temperature rise lf the secondary limit opens it must be replaced 2 Electric Heat Sequencer Relays K32 K33 K34 K35 and K116 208 230 volt only Relays K32 K33 K34 K35 and K116 are N O se quencer relays with a resistive element a coil and a bi metal disk which actuates the contacts The re lays are located on the electric heat vestibule panel and are energized by a 24V heating demand W1 W2 and W3 jack plug 2 J2 which is used to connect electric heat to the blower coil control circuit When energized the internal resistance heats the bi metal disk causing the con For the electric heat sections without circuit breakers or fuses line voltage connections are made to terminal strip TB2 The terminal strip is located in the lower left corner of the electric heat vestibule panel Single phase electric heat uses two pole terminal strips while three phase elec tric heat uses three pole terminal strips 5 Heating Elements HE1 through HE6 Heating elements are composed of helix wound bare nichrome wire exposed directly to the airstream The ele ments are supported by insulators mounted to the wire frame For single phase applications one elementis used per stage Each stage is energized indepen dently by the corresponding relay located on the electric heat vestibule arranged in a three phase del ta Once energized heat transfer is instantaneous High temperature protection is provided by primary and secondar
24. 1 Y1 to Y2 and Control Condensing inge spee OtoR Unit The CCB1 may become indefinitely latched in the dehumid ification mode when power to the unit is turned off This condition can be caused by turning off power while dehu midification demand is present then turning on power when dehumidification demand is satisfied If the CCB1 be comes stuck in this manner it can be reset by removing thermostat demand then moving the CCB1 slide switch all the way down and back up to its setpoint How to unlatch CCB1 1 Force a cooling demand by setting thermostat to COOL mode and by moving thermostat lever to lowest posi tion 2 Move CCB1 slide control down to 40 relative humid ity CCB1 lights should come on 3 Now move CCB1 slide control back up to 60 relative humidity The lights should go off 4 Remove thermostat demand by moving thermostat le ver to cycle unit off Applications with the EfficiencyP us CCB1 humidity control create different CFM volumes For example during a first stage cooling call two speed outdoor unit with no demand from the CCB1 the air volume is 40 of the COOL jumper selection For a normal COOL Pin 2 setting for CB31MV 41 the is 1125 the reduced speed is 450 1125 x 40 450 This arrangement provides for additional dehumidification during first stage cooling See tables 10 and 11 for various scenarios concerning use of the CCB1 humidity control and the CB31MV series unit P
25. 1 closes see electric heat 2 T1 supplies 24VAC to terminal strip TB1 which sup B dE lay K20 2 if used i ized after K32 1 plies 24VAC to the indoor thermostat and electric heat if antar ised closes see electric heat section HEATING 6 K20 2 closes energizing the economizer with 24VAC 3 When there is a call for heat W1 of the thermostat ener gizes the electric heat relay K32 covered in the electric COOLING heat section After K32 closes blower relay K20 1 is energized 7 See Table 15 for cooling sequence of operation Page 31 TABLE 15 1 COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITHOUT CCB1 WITHOUT SIGNATURESTAT WITHOUT HARMONY THERMOSTAT 1 UNIT JUMPERS DEMAND BLOWER SPEED Single Speed Two Speed DS to Y1 60 65 70 of COOL Condensing Unit Oto R 2 COOL DS to Y1 Single Speed Heat Pump Y1 to Y2 COOL _ 60 65 70 of COOL Two Speed Heat Pump DS to Y1 25 COOL CB31MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITH CCB1 WITHOUT HARMONY UNIT JUMPERS THERMOSTAT DEMAND BLOWER SPEED Single Speed Y1 to Y2 Two Speed Single Speed Heat Pump Y1 to Y2 table 11 Two Speed Heat Pump NONE See table 10 CB31MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITH SIGNATURESTAT WITHOUT HARMONY UNIT JUMPERS THERMOSTAT DEMAND amp BLOWER SPEED Single Speed Y1 to Y2 Two Speed Single Speed Heat Pump
26. 40 10 kW 29 10 28 43 3steps 208 7 5 25 600 9 1 37 45 6 Ibs Terminal block 220 8 4 28 700 9 1 41 50 e ST 230 9 2 31 400 9 1 41 50 240 10 0 34 100 9 1 41 50 15 kW 29 15 28 44 3steps 208 11 3 38 400 9 1 50 60 12 Ibs Circuit breaker 220 12 6 43 000 9 1 56 Pe es pn 25 60 SUM 230 13 5 47 000 9 1 56 60 240 15 0 51 200 9 1 56 60 20 29 20 28 45 6steps 208 15 0 51 200 9 1 37 21 4145 4130 19 Ibs 2 35A Circuit breakers 220 16 8 57 300 9 1 41 24 7150 35 S 230 18 4 62 700 9 1 41 24 4150 35 240 20 0 68 200 9 1 41 24 4150 35 25 kW 29 25 28K46 6steps 208 18 8 64 100 9 1 44 27 50 4140 19 Ibs 2 45A Circuit breakers 220 21 0 71 700 9 1 49 30 NM 7160 45 Erou 230 23 0 78 300 9 1 49 30 4160 45 240 25 0 85 300 9 1 49 30 4160 45 T Electric heater capacity only does not include additional blower motor heat capacity 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 75 C 4 Bold text indicates that the circuit breaker on circuit breaker models must be replaced with size noted See Optional Circuit Breaker table for catalog numbers NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps
27. 8 mm OF LINE Trap must be deep enough to offset maximum static difference Generally 2 inches 51mm minimum FIGURE 31 It is recommended that the auxiliary drain be connected to a drain line for all units If auxiliary drain is not connected it must be plugged with provided cap For downflow units the auxiliary drain MUST be connected and routed to a drain See figure 32 for auxiliary and main drain locations LEFT HAND DISCHARGE UPFLOW OR DOWNFLOW RIGHT HAND DISCHARGE AUXILIARY DRAIN ON LEFT FIGURE 32 MAIN DRAIN ON RIGHT The following practices are recommended to ensure con densate removal 1 Drain piping should not be smaller than the drain con nections at drain pan 2 Atrap must be installed in the main drain line 3 The trap must be deep enough to offset the difference in static pressure between drain pan and atmosphere Gen erally two inches is satisfactory for medium static applica tions 4 Horizontal runs must be sloped 1 25mm per 10 feet 3 1m of drain line to offset friction 5 An open vent in drain line will sometimes be required due to line length friction and static pressure 6 Drains should be constructed in a manner to facilitate fu ture cleaning and not to interfere with filler access See fig ure 31 7 Auxiliary drain should run to an area where homeowner will notice it draining Refer to local codes VII START UP OPE
28. BREAKER ELECTRIC HEAT CIRCUIT BREAKERS UNIT 1 CRT 20CB 40A CIRCUIT BREAKER ELECTRIC HEAT NT ELECTRIC HEA ELEMENT ELECTRIC HEA ELEMENT ELECTRIC HEA PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT 2 RELAY SEQUENCER ELECTRIC HEAT 2 RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY CIRCUIT 2 LI LTN L2 5 CB2 EQUIPMENT GROUND im Z REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE 35A 50A NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT EQUIPMENT LENNOX 2 inc WIRING 11 95 HEATING UNITS ELECTRIC 29 20 25 1 551 707 Litho U S A Supersedes Form No 1995 Lennox Industries Inc FIGURE 41 H ECB29 20CB 25CB 208 230V THREE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 When there is call for heat W1 of the thermostat energizes the electric heat relays K32 and K34 with SECOND STAGE HEAT remove jumper between W2 and R 5 When K34 2 closes the unit is ready for a second stage 24VAC heat demand W2 of the thermostat sends a second 2 When K32 1
29. HUMIDIFY 45 MAIN MENU SELECT FIGURE 17 Dehumidity Sensor Settings The dehumidity sensor settings have minimum and mum settings The sensor settings can be adjusted in 1 increments See table 9 TABLE 9 Range Maximum setting 1 On the humidity menu press the up or down button to again highlight DEHUMIDIFY See figure 18 Setting Dehumidity Levels DEHUMIDIFY MENU MODE ORE DEHUMIDIFY 45 MAIN MENU SELECT Figure 18 2 Use the up and down button to adjust the humidity level See figure 19 Setting Dehumidity Levels DEHUMIDIFY CONTROL 45 MAIN MENU SELECT Figure 19 Page 21 TABLE 10 TYPICAL CB31MV CCB1 and TWO SPEED OUTDOOR UNIT OPERATING SEQUENCE OPERATING SEQUENCE System Condition SYSTEM DEMAND Thermostat Demand Relative Humidity EfficiencyPlus Lights RK Compres sor Speed SYSTEM RESPONSE Blower CFM COOL Comments Y1 Acceptable None Low 40 of COOL Normal operation Y2 Y1 Acceptable None Acceptable None High COOL 40 of COOL Call for humidity re moval during 1st Y1 Change to Slightly over setpoint 1 40 of COOL stage thermostat demand Demand Satisfied Slightly over setpoint 1 Off Significant increase Y1 Slightly over setpoint 1 Acceptable None 60 65 40 of COOL in humidity during thermostat demand Chang
30. IRCUIT BREAKERS KW AMPS KW 3 50A T 13180A NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT lt T A gt CB2 EQUIPMENT 7 AE EQUIPMENT GROUND GROUND 2 4 REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE 9 EQUIPMENT GROUND LENNOX WIRING DIAGRAM 10 95 HEATING UNITS ELECTRIC ECB29 25CB 5008 P Supersedes Form No New Form No 531 618W 1995 Lennox Industries Inc Litho U S A FIGURE 39 F ECB29 25CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 5 When K33 1 closes the blower if not energized is ener 1 When there is a call for heat W1 of the thermostat gized on heating speed and economizer heat relay K43 is energizes the electric heat relays K32 and K34 with energized see 208 230VAC CB schematic 24VAC 6 When K33 2 and K116 1 close assuming the N C 2 When K32 1 closes the blower is energized on heat primary 815 and secondary 20 limit switches ing speed and economizer heat relay K20 2 is en are closed electric heat elements HE3 and HE6 are ergized see unit schematic 26 energized 3 When K32 1 and K32 2 closes assuming the N C primary 515 and secondary 520 limit switches are closed electric heat elements HE1 and HE2 are energized
31. Jumper Speed Motor Watts Various External Static Pressures in wg Pa Adjust Jumper at Setting o 07 8 0260 830 84008 85029 os 200 Speed m om om om om om Be om 1 m m tes mper m RR Pow fom ome m ose em 9m 8 CB31MV 51 AND CB31MV 65 BLOWER MOTOR LE a AT NORM BDC3 SETTING BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Adjust Jumper at NORM Setting Speed we es re ro me es es Co soa 0 E74 E pep 25 Tapa 59 on 65 65 5 so CB31MV 51 AND CB31MV 65 BLOWER MOTOR AER AT Minus BDC3 SETTING BDC3 Jumper Speed Motor Watts Various External Static Pressures wg Adjust Jumper at Setting CETUR EA Fc 1 1 5 HEAT er o om pom om po 9 MEE RE ERRORES EN Bes om om om pom om m om pom pom poem pom pom 15 repa oss oe ss ss s ss ew 9e Page 11 IV OPTIONAL 29 31 ELECTRIC HEAT
32. Load Amps Page 13 6 CB31MV 51 AND CB31MV 65 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT CB31MV 51 and CB31MV 65 Blower Number voite KW Motor Full Circuit Ampacity Fuse Size Model Number ps input P Load Amps Circuit 1 Circuit 2 Circuit 3 Circuit1 Circuit 2 Circuit 3 5 kW ECB29 5 28K31 1step 208 3 8 12 800 9 1 34 40 4 Ibs Terminal Block 220 4 2 14 300 9 1 37 NT 2 5 45 EL unis ECB29 5CB 28K32 30A Circuit breaker pose O90 a 42 240 5 0 17 100 9 1 37 45 Dis M 6 kW 29 6 47122 155 208 4 5 15 400 9 1 36 45 E 4 Ibs Terminal Block 220 50 17 100 9 1 43 ME ids 50 eee 29 6 47123 35A Circuit breaker 290 ew 198005 454 43 B 240 6 0 20 500 9 1 43 50 8 kW 29 8 28 33 2steps 208 6 0 20 500 9 1 47 50 5 Ibs Terminal Block 220 6 7 22 900 9 1 53 ONE id 60 XM 29 8 28 4 4 45A Circuit breaker 2 1 594 29 ene 60 eo 527 240 8 0 27 300 9 1 53 60 9 kW 29 9 10111 2steps 208 6 8 23 100 9 1 52 60 5 Ibs 50A Circuit breaker 220 7 6 25 800 9 1 58 rs 60 CENA Lc ECB29EH 9CB 91K67 4 50A Circuit break
33. MEPLATE 3 HES 4 ELEMENT ELECTRIC HEAT MINIMUM CIRCUIT gt P2 PLUG ELECTRIC HEAT AMPACITY AND K32 1 2 RELAY SEQUENCER ELECTRIC HEAT K33 1 2 RELAY SEQUENCER ELECTRIC HEAT MAXIMUM OVER PROTECTION Size NOTE USE COPPER CONDUCTORS ONLY K34 1 2 RELAY SEQUENCER ELECTRIC HEAT 515 SWITCH LIMIT PRIMARY AUTO RESE LINE VOLTAGE FIELD INSTALLED S20 SWITCH LIMIT SECONDARY lt DENOTES OPTIONAL COMPONENTS CIRCUIT 3 CIRCUIT 2 CIRCUIT gt L2 lt 83 SE CB2 ME EQUIPMENT 63 EQUIPMENT EQUIPMENT 8 GROUND N GROUND 509 GROUND _ 4 e x 1 Lc T E m Y 2 9 L L 2 D Be 520 520 520 pe HE2 LENNOX sries me WIRING DIAGRAM 11 95 HEATING UNITS ELECTRIC ECBS 20 1 Supersedes Form ew Form No 764W N 55 1995 Lennox Industries Inc Litho U S A FIGURE 38 E ECB31 20CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION SECOND STAGE HEAT FIRST STAGE HEAT 1 When there is a call for heat W1 of the thermostat energizes the electric heat relays K32 and K33 with 24VAC When K32 1 closes the blower is energized on heat ing speed and economizer heat relay K20 2 is ener gized see unit schematic figure 26 When K32 1 and K32 2 close assuming the N C
34. N AND GENTLY PULL THE COVER OUT AT THE BOT TOM AND PIVOT IT UP AND AWAY FROM BASE FIGURE 12 A CCB1 Optional Comfort Control Board CCB1 A20 may be installed adjacent to the indoor thermostat figure 12 The control monitors indoor humidity conditions and creates a dehumidification demand in response to indoor humidity just as the thermostat creates a cooling demand in re sponse to indoor temperature The CCB1 works in com bination with the indoor thermostat to adjust compressor speed and indoor blower speed Although the control pro vides a dehumidification demand only the thermostat can directly control compressor operation The CCB1 cannot call for a compressor cycle by itself Principles of Cooling with Drier Air The humidity comfort range for humans is between 40 and 60 relative humidity RH A vertical slide on the con trol allows the humidity setpoint to be adjusted within that comfort range 50 RH is the recommended initial setpoint until personal comfort level is established The personal comfort level will vary with humidity as with temperature For example if air at 75 F and 50 RH is changed to 60 RH the air will feel much warmer Likewise if the air is reduced to 4096 RH it will feel much cooler Even when inactive the body evaporates a large amount of moisture away from the skin This evaporation produces a cooling effect during wintertime this phenomenon is called wind chill Dry air is ca
35. RATION A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions 2 Inspect electrical wiring both field and factory installed for loose connections Tighten as required 3 Check voltage at disconnect switch Voltage must be with in range listed on the nameplate If not consult the power company and have voltage condition corrected be fore starting unit 4 Check to ensure that refrigerant lines are in good condition and pipe insulation is intact 5 Inspect condition of condensate drain pan and piping as sembly Disassemble and clean seasonally B Cooling Start Up NOTE The following is a generalized procedure and does not apply to all thermostat control systems Electronic thermostat control systems may operate differently 1 Set fan switch to AUTO or ON and move the system selection switch to COOL Adjust the thermostat to a set ting far enough below room temperature to bring on the compressor Compressor will start and cycle on demand from the thermostat 2 The refrigerant circuit is charged with R 22 refrigerant See condensing unit rating plate for correct charge amount 3 Refer to the correct condensing unit service manual for more information C Heating Start Up 1 fan switch to AUTO or ON and move the sys tem selection switch to HEAT Adjust the thermostat setting above room temperature 2 The indoor blower immediately starts and the electri
36. RIAL lt DENOTES OPTIONAL COMPONENTS NOTE USE COPPER CONDUCTORS ONLY L t CIRCUIT L2 L2 j 2 B2 ECB29 5CB ORN UNITS lt gt y ECB29 2 5 5 8KW UNITS g N EQUIPMENT GROUND 515 AN CONNECT POWER WIRES FROM UNT LABELED LI AND L2 TO TB2 TERMINAL STRIP ON HEATER PLATE REFER TO UNIT NAMEPLATE FOR HE2 5 PROTECTION SIZE C EQUIPMENT GROUND IS LOCATED IN INDOOR UNIT 5KW ONE ELEMENT LENN UXS me WIRING DIAGRA HEATING UNITS ELECTRIC 29 2 5 5 8 1 ECB29 5CB 8CB P Supersedes Form No New Form No 551 616W 1995 Lennox Industries Inc Litho U S A FIGURE 35 B ECB29 5 5CB 8 8CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 of the thermostat ener 3 Assuming the primary 15 and secondary 20 gizes the electric heat relay K32 with 24VAC limit switches are closed electric heat element HE1 is en ergized 2 When 2 1 closes the blower is energized on heat 4 When K32 2 closes assuming the N C primary 815 ing speed and economizer heat relay K20 2 is en and secondary S20 limit switches are closed electric ergized see unit schematic figure 26 heat element HE2 is energized Page 33
37. TABLE 1 FACTORY BLOWER SPEED TAP SELECTION SPEED TAP SELECTION COOL o HEAT Dre HEAT PUMP WITH WITH ELECTRIC ELECTRIC HEAT HEAT ONLY CB31MV BLOWER CONDENS ING UNIT Minimum setting for heat To change jumper positions gently pull the jumper off the pins and place it on the desired set of pins The following section outlines the different jumper selections available and condi tions associated with each one Refer to figure 5 for identifi cation After the CFM for each application has been determined the jumper settings must be adjusted to reflect those given in tables 2 and 3 From tables 2 and 3 determine which row of CFM volumes most closely matches the desired CFM Once a specific row has been chosen NORMAL or CFM volumes from other rows cannot be used Below are the descriptions of each of the jumper selections Page 5 BDC3 VARIABLE SPEED CONTROL SELECTIONS JP1 15 PIN PLUG BOARD TO MOTOR DIAGNOSTIC DS LEDS ACCESSORY RELAY CONTACTS DRIVES OPTIONAL ACCESSORY RELAY OPERATIONAL SELECTOR PINS Affects both heating and cooling modes COOLING SPEED HEATING SPEED SELECTOR PINS SELECTOR PINS FAN DELAY SELECTOR PINS FIGURE 5 ADJUST The ADJUST pins allow the motor to run at normal speed approximately 1096 higher or approximately 1096 lower than normal speed Tables 2 and 3 give three rows NORMAL and with t
38. UNITS ELECTRIC ECB29 12 5CB 15CB 1 P Supersedes Form No New Form No 531 614W 1995 Lennox FIGURE 37 Industries Inc Litho U S A D ECB29 12 5CB 15CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 When there is a call for heat W1 of the thermostat ener gizes the electric heat relay K32 with 24VAC When K32 1 closes the blower is energized on heat ing speed and economizer heat relay K20 2 is en ergized see unit schematic figure 26 Assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 4 Page 35 When K32 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relay with 24VAC When K33 1 and K33 2 close assuming the N C primary 815 and secondary S20 limit switches are closed electric heat elements HE2 and HE3 are energized ARRANGEMENT 2 D 1 2 6 5 CBI 2 23I x OO HE2 X 2 4 404 30A 604 Q 7 C 5 lt E CEO 57 H DESCRIPTION KEY NENT CBI 2 3 CIRCUIT BREAKER ELECTRIC HEAT REFER TO UNIT HEI 2 ELEMENT ELECTRIC HEAT NA
39. age 19 Lennox SignatureStat Signature Stat FIGURE 13 B SignatureStat The Lennox SignatureStat can be installed in place of the indoor thermostat figure 12 The SignatureStat monitors indoor humidity conditions and creates a dehumidification demand in response to indoor humidity just as it creates a cooling demand in response to indoor temperature The SignatureStat adjusts compressor speed and indoor blow er speed to maintain humidity at a comfortable a level Principles of Cooling with Drier Air The humidity comfort range for humans is between 40 and 60 relative humidity RH 50 RH is the recom mended initial setpoint until personal comfort level is estab lished The personal comfort level will vary with humidity as with temperature For example if air at 75 F and 50 RH is changed to 60 RH the air will feel much warmer Likewise if the air is reduced to 4096 RH it will feel much cooler Even when inactive the body evaporates a large amount of moisture away from the skin This evaporation produces a cooling effect during wintertime this phenomenon is called wind chill Dry air is capable of absorbing more moisture away from the skin thereby increasing the cooling effect When the SignatureStat senses that the indoor humidity level is above the control setpoint the control places the CB31MV and outdoor unit in a dehumidification mode in order to take advantage of the dry air cooling effect
40. alled directly above the indoor thermo stat the humidity sensor calibration will be thrown off If the CCB1 is installed directly above the indoor thermostat it should be relocated to the side of the thermostat Refer to CCB1 installation instructions Other Conditions Which Adversely Affect Performance Blower speed selection can adversely affect CCB1 perfor mance Higher blower speeds should be selected to pro vide maximum sensible cooling while lower blower speeds should be selected to provide maximum humidity removal Refer to CB31MV CCB1 installation instructions It is recommended that the indoor blower be left in AUTO mode at all times During dehumidification mode the in door coil and drain pan may become saturated with mois ture If the indoor blower is left in ON mode much of that moisture can be re evaporated into the living space be tween thermostat demands This can create a constant de mand for humidity removal and may cause extended com pressor run times Refer to table 7 for jumpers per application CB31MV units manufactured January 2002 and later will have factory installed jumpers Remove jumpers not used TABLE 7 JUMPERS REQUIRED Single Speed x AM Heat Pump Two Speed DS to Y1 DS to 1 and Single Speed Y1 to Y2 and Condensing OtoR Unit Without CCB1 Humidity Control DS to Y1 and Two Speed OtoR Heat Pump With CCB1 Hu Two Speed None midity Sinale 6066
41. auxiliary drain G Coil CB31MV series units have dual slab coils arranged in an A configuration Each coil has two or three rows of copper tubes fitted with ripple edge aluminum fins A check and expansion valve complete with screen feeds multiple paral lel circuits through the coils The coil is designed to easily slide out of the unit cabinet H Blower Relay K20 All units use SPDT relay to energize the blower motor in re sponse to heating demand The relay coil is energized when the 1st stage electric heat relay closes When K20 is ener gized its contacts close to energize jackplug JP46 pin 2 located on blower drive control A15 When JP46 2 is en ergized the blower drive control immediately energizes the blower on heating speed Heating speed will override cool ing speed K20 2 will energize the economizer if used re fer to wiring diagram Optional electric heating elements are sequenced so blow er relay K20 operates on a first on last off basis 4 1 Speed Blower Motor CB31MV series units use a single phase VSM variable speed motor see figure 4 A solid state controller is at tached to the motor CB31MV MOTOR BLOWER HOUSING ARROW MUST MOTOR CONTROLLER CB31MV BLOWER MOTOR COMPONENTS STATOR WINDINGS BEARING OUTPUT FIGURE 4 J BDC3 Blower Control Board A15 on CB31MV unit is controlled by the BDC3 board A15 located in t
42. ay wait until complete Perform VSM check Current leakage from controls into Y W Check for Triac switched thermostat or solid state relay Air noise Noisy Blower or cabinet Check for proper airflow setting Check replace filter Use low pressure drop filter Check correct duct restrictions Check for loose blower housing panels etc If high static causing noise check for air whistling through seams in ducts cabinets or panels Check cabinet duct for deformation Motor failure has occurred and moisture Replace motor and perform moisture check is present Motor Connectors 5 Pin Power connector 16 Pin Control Connector Out Adjust Y1 Cool Delay Common 2 W W1 Common 1 Cable Half AC Line AC Line Gnd Line 1 and 2 will be con nected for 120 Vac ap plications only Out G fan YIY2 EM ht W2 24Vac R Heat DS Pwn Speed O Rev Valve FIGURE 6 Notes on 5 Pin AC Line Connection See Figure 6 The VSM connects directly to the line Pins 1 amp 2 are jumpered in the harness for 115V operation e Make sure power is off before inserting power connector Plug is polarized Notes on 16 Pin Control Connection See Figure 6 e Control functions Y1 Y2 may be active at greater than 5 x control transformer voltage Do not apply 24vac to either Out pin 8 or16 High voltage
43. c heat will stage on based on sequence timing D Safety or Emergency Shutdown Turn off unit power at circuit breaker E Extended Period Shutdown Turn off thermostat or set to UNOCCUPIED mode Turn off power to unit All access panels and covers must be in place and secured The condensate assembly should be clean and dry for ex tended period shutdown Page 29 VIII TYPICAL OPERATING CHARACTERISTICS A Blower Operation and Adjustment NOTE The following is a generalized procedure and does not apply to all thermostat controls 1 Blower operation is dependent on thermostat con trol system 2 Generally blower operation is set at thermostat sub base fan switch With fan switch in ON position blower operates continuously With fan switch in AUTO posi tion blower cycles with demand 3 In all cases blower and entire unit will be off when the system switch is in OFF position B External Static Pressure 1 Measure tap locations as shown in figure 33 STATIC PRESSURE TEST UNIT SHOWN IN UPFLOW POSITION SUPPLY RETURN FIGURE 33 2 Punch 1 4 6mm diameter hole in supply and return air plenums Insert manometer hose flush with inside edge of hole or insulation in the supply plenum only Seal around the hose with permagum Connect the other end of the hose to the zero end of the manometer Leave the other end of the manometer op
44. cation cooling blower speed is as follows 65 of COOL cfm for 41units 60 COOL cfm for 51 and 61 units n Precision mode Signature thermostat built BEFORE October 2003 will maintain the room temperature up to 3 F 1 8 C cooler than room thermostat setting Precision thermostat built AFTER October 2003 will maintain the room temperature up to 2 1 2 C cooler than the room thermostat setting Page 24 VI CONFIGURATION MODIFICATIONS CB31MV unit may installed the upflow downflow zontal right hand discharge or horizontal left hand discharge orientation The units come from the factory ready for upflow or horizon tal right hand discharge installation If the unit needs to be modified from its original configuration use the following procedures All procedures assume the unit has not been modified from the factory A Disassembly of CB31MV Cabinet For tight applications where a modular design is an ad vantage the CB31MV unit can be easily disassembled and re assembled By removing four screws the coil lifts off so the unit is in two parts To disassemble the CB31MV use the following procedure 1 Remove the two black screws located just above the seam in the top half of the unit 2 Remove the front access panel and remove the two screws on the inside of the top half of the cabinet on both sides 3 Lift the top section apart from the bottom section 4 To lighten the cabinet for lifting the blo
45. closes the bloweris energized on heat stage heat demand energizing the electric heat relays ing speed and economizer heat relay K20 2 is en K33 and K35 with 24VAC ergized see unit schematic figure 26 When K33 1 closes the blower if not energized is 3 When K32 1 and K32 2 closes assuming the N C energized on heating speed and economizer heat primary 815 and secondary S20 limit switches relay K43 is energized see 208 230VAC CB sche are closed electric heat elements HE1 and HE2 are matic energized When K33 1 K35 1 and K35 2 contacts close assum 4 When K34 1 closes assuming the primary 15 ing the primary 15 and secondary S20 limit and secondary S20 limit switches are closed electric heat element HE3 is energized Page 39 switches are closed electric heat elements HE4 HE5 and HE6 are energized
46. e base Set the unit on the additive base so flanges of the unit drop into the base opening and seal against the in sulation strips Seal around the insulation strips with perma gum The unit is now locked in place Install return air plenum and secure with sheet metal screws DONDE COMBUSTIBLE BASE DIMENSIONS SUPPLY AIR OPENING 1 5 8 41 22 118 Lh 562 prt ERG 13 3 8 340 2 51 VIEW FIGURE 25 D Horizontal Right Hand Discharge Application NOTE For horizontal applications a secondary drain pan is recommended Refer to local codes 1 Discard drip shields if applicable The shields are used for downflow applications only 2 Place blower coil on its right side 3 No further adjustment is necessary Set unit so it is sloped toward the drain pan 1 4 6mm See figure 26 4 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is supported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 27 Connect return and supply air plenums as re quired using sheet metal screws NOTE For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan Removal of downflow rail will prevent sweating in high hu midity areas To re
47. e to Significantly over setpoint 2 or more 60 65 of COOL Compressor demand and indoor blower speed follow thermostat demand Dehumidification mode begins with next thermostat demand after initial thermo stat demand is satisfied If humidity increases significantly over set point or if slide switch is moved significant ly unit will immediately go into dehumidifi cation mode in presence of thermostat de mand 60 65 of COOL COOL Over Setpoint T 22 When humidity demand is satisfied blower immediately shifts to the COOL CFM in order to hasten the end of the cycle Unit can only shift out of high speed compressor operation at begin ning of next cycle Change to Acceptable None Humidity demand satisfied during thermostat demand Off 40 of COOL COOL 60 65 of COOL COOL Acceptable None None Acceptable None Acceptable None Change to Slightly over setpoint 1 Call for humidity re moval during 2nd stage thermostat de mand Blower immediately changes speed in response to thermostat demand Acceptable None Off 40 of COOL Call for 1st stage cooling after call for humidity removal Slightly over setpoint 1 Dehumidification mode high speed com pressor begins with next thermostat de mand after initial demand is satisfied Slightly over setpoint 1 Off 60 65 of COOL Off Call for 2nd stage Slightly
48. eal See figure 28 6 Rotate horizontal drip shield 180 front to back 7 Remove plastic plug from left hole on coil front end seal and re install plug in back hole Re install hori zontal drip shield screw in front coil end seal Drip shield should drain downward into horizontal drain pan inside coil 8 Rotate top cap 180 front to back and align with un used screw holes Holes must align with front and back coil end plates Note that top cap has 45 bend on one side and 90 bend on the other The 90 bend must be on the same side as the horizontal drain pan See figures 28 and 29 NOTE Use extreme care when re installing screws into coil end plate engaging holes Coil damage could result by mis alignment FIELD MODIFICATION FOR LEFT HAND DISCHARGE eR CABINET SUPPORT COIL SHOWN IN UP FLOW POSITION FOR EASY CONVERSION FIGURE 28 BACK COIL END SEAL 90 BEND FIGURE 29 9 From the upflow position replace coil assembly Then flip cabinet 90 to the left and set into place Replace coilassembly Secure coil in place by bend ing down tab on cabinet support rail See figures 28 and 30 LEFT HAND DISCHARGE CONFIGURATION HORIZONTAL DRIP SHIELD SECURING TAB ON CABINET SUPPORT RAIL SNL HORIZONTAL DOWNFLOW RAIL DRAIN PAN FIGURE 30 NOTE For horizontal applications in high humidity areas rem
49. eck for undercharged condition e Check for plug leaks in return ducts cabinet VSM CHECK 70J11 can be used to check the VSM The kit is avail able at the Lennox parts center If not using the kit follow the procedure below These settings and jumper place ments will bypass the BDC3 control board and confirm cor rect VSM operation 60 65 70 of Cool speed Disconnect power to the unit Change delay pin setting on the BDC3 board to 1 Remove wires from terminal strips in control box e Install jumpers between R and YT and R and e Turn on power to unit 60 65 7096 of cool speed e When check is complete disconnect power and replace delay setting to original position Reduced blower speed is 6596 of COOL for the 036 UNITS 6096 of COOL for 048 and 060 series units manufactured prior to August 2002 and 70 COOL for ALL units manufac tured August 2002 and later Cool speed Disconnect power to unit Blower should operate on Change delay pin setting on the BDC3 board to 1 Remove wires from terminal strips in control box e Install jumpers between R and R and Y2 R and 5 R and e Turn on power to unit cool speed Blower should operate on e When check is complete disconnect power and replace delay setting to original position Heat Speed Disconnect power to the unit Change delay pin setting on the BDC3 board to 1 e Remove wires fr
50. elec tion until supplemental electric heat is demanded At that time the blower will operate at the HEAT speed selected This arrangement provides for warmer supply air during heat pump operation only HEAT The HEAT jumper is used to determine CFM during a W1 demand for electric heat operation These jumper selec tions are activated when W1 is energized with or without a Y1 demand for heat pump compressor DELAY The DELAY jumper is used to set the specific motor fan mode of operation during cooling Depending on the ap plication one of four fan options may be chosen by moving the jumper pins to the appropriate set of pins Options 1 2 3 or 4 will have an increased dehumidification effect on the system Option 1 will have the least effect and option 4 will have the greatest effect Applications with the EfficiencyPlus CCB1 humidity control create different CFM volumes For example during a first stage cooling call two speed outdoor unit with no demand from the CCB1 the air volume is 40 of the COOL jumper selection For a normal COOL Pin 2 setting for CB31MV 41 the is 1125 the reduced speed is 450 1125 x 40 450 This arrangement provides for additional dehumidification during standard first stage cool ing See tables 10 and 11 for various scenarios concerning use of the CCB1 humidity control and the CB31MV series unit Applications with the Lennox SignatureStat but no demand for dehumid
51. en to the atmosphere 3 With only the blower motor running and the evapora tor coil dry observe and take note of the manometer reading 4 Repeat step 2 for the return air plenum Insert ma nometer hose to the opposite end of the zero side of the manometer Leave the zero side of the manome ter open to atmosphere 5 Repeat step 3 6 Add the absolute values of the supply air reading and the return air reading to get the external static pressure of the unit For example 20 in wg on the return and 7 30 in wg on the supply result in external static pressure of 50 in wg External static should not exceed 80 w g 200Pa Adjust blower motor speed to deliver the air desired ac cording to job requirements 7 Sealaround the holes when the check is complete IX MAINTENANCE At the beginning of each heating cooling season the sys tem should be checked as follows A Filters A IMPORTANT Filter access panel must be in place during unit operation Excessive warm air entering the unit may result in water blow off problems To remove filter loosen the thumb screws holding the fil ter panel in place Slide filter out of the guides on either side of cabinet insert new filter and replace panel Some models come with a spacer so standard size filters can be used Filters should be inspected monthly and must be replaced when dirty to ensure proper blower coil op eration See table 14 for replacement filter sizes or see the
52. er 2995 1 x di 69 cis wane 240 9 0 30 700 9 1 58 60 12 5 kW ECB29 12 5CB 28K37 3steps 208 94 32 000 9 1 30 31 4140 4145 10 16 1 25 amp 1 50A Circuit breaker 220 10 5 35 800 9 1 33 35 7145 50 29 12 5 91 68 j 1 25A amp 1 50A Circuit breaker cud 2d 35 Ser n PER 240 12 5 42 600 9 1 33 35 4145 50 15 kW ECB29 15CB 28 38 208 11 3 38 400 9 1 34 37 40 4 50 12 Ibs 1 30A amp 1 60A Circuit breaker 220 12 6 43000 9 1 37 42 eM 45 60 TEM ECB29EH 15CB 91K69 1 30A 8 1 60A Circuit breaker 230 13 5 47 000 9 1 37 42 45 60 240 15 0 51 200 9 1 37 42 45 60 20 29 20 11131 4 steps 208 15 0 51 200 9 1 53 41 60 60 19 Ibs 1 50A amp 1 60A Circuit breaker 220 16 8 57 300 9 1 58 46 Dew 60 60 Lm ECB29EH 20CB 91K70 1 50A 8 1 60A Circuit breaker 55 98 46 P 55 xd 240 20 0 68 200 9 1 58 46 60 60 25 kW 29 25 28K40 6 208 18 8 64 100 9 1 49 31 31 50 4145 4145 19 lbs 3 50A Breakers 220 210 71 700 9 1 54 35 35 60 50 50 230 23 0 78 300 9 1 54 35 35 60 50 50 240 25 0 85 300 9 1 54 35 35 60 50 50 THREE PHASE ELECTRIC HEAT APPLICATIONS 8 kW ECB29 8 28 42 3steps 208 6 0 20 500 9 1 32 40 5 Ibs Terminal block 220 6 7 22 900 9 1 35 m 40 e 230 7 3 25 100 9 1 35 40 240 8 0 27 300 9 1 35
53. es units use a single line voltage to 24VAC transformer mounted in the control box The transformer supplies power to the control circuits in the indoor and outdoor unit Transformers on all CB31MV 1 units and CB31MV 51 61 2 units are rated at 7 Trans formers CB31MV 41 2 units are rated at 40 208 240VAC single phase transformers use two primary volt age taps as shown in figure 3 208 240 VOLT TRANSFORMER SECONDARY BLUE 8 PRIMARY ORANGE 240 VOLTS RED 208 VOLTS YELLOW FIGURE 3 D Circuit Breaker CB8 1 units All transformers used in the CB31MV 1 series units are equipped with internal secondary voltage overcurrent protection Each transformer uses a manual re set circuit breaker CB8 located on the transformer The circuit breaker is connected in series with the blue secondary volt age wire and is rated at 3 5 Amps E Fuse F1 2 units The transformer used in all CB31MV 2 units is protected by an inline fuse F1 The fuse is rated at 32 volts and 3 amps F Plastic Drain Pans Both upflow downflow and horizontal drain pans are pro vided and installed on the CB31MV units The drain pans are made from fiberglass filled plastic The drain hole is used for right hand air discharge only and must be plugged when the unit is configured for left hand air discharge see page 24 for horizontal left hand application Each pan has a set of connections one for a primary drain and one for an
54. ghts that are on will stay on until the first thermostat heating demand Reduced blower speed is 65 of COOL for the 41 units 60 of COOL for 51 and 65 series units TABLE 12 CB31MV SignatureStat and SINGLE STAGE OUTDOOR UNIT OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Demand Relative Relative Humidity System NO CALL FOR DEHUMIDIFICATION 24 Compressor and indoor Normal Operation 1 On On Acceptable VAC High 10096 blower follow thermostat demand BASIC MODE only active on a Y1 thermostat demand 24 Y1 and de energizes D on a PRECISION MODE operates independent of a Y1 thermostat demand 24 Dehumidification 0 Dehumidification 0 SignatureStat will to setpoint by allowing the Jumpers at indoor unit with a single stage outdoor unit room space to maintain a With Condensing unit Y1 to Y2 and R to O cooler room thermostat With Heat Pump Y1 to Y2 setpoint Lennox SignatureStat used for these applications are 51M26 1 heat 1 cool or 51M28 2 heat 2 cool heat pump During dehumidification cooling blower speed is as follows 6596 of COOL cfm for 41units 60 COOL cfm for 51 and 61 units n Precision mode Signature thermostat built BEFORE October 2003 will maintain the room temperature up to 3 F 1 8 C cooler than room thermostat setting Precision thermostat built AFTER October 2003 will maintain the room temperature to 2 F 1 2 co
55. gures 22 and 23 side view 1 Apply two pieces of foam tape provided down both ends of each shield The tape should measure 4 3 4 X 2 120 X 25 mm Ensure that the tape covers both sides of the shield equally 2 Apply the longer piece of foam tape between the pieces on each end This piece of tape is 1 wide FIGURE 22 DOWNFLOW DRIP SHIELDS N Drip Shield FIGURE 23 6 Replace coil assembly and blower if removed Re place coil access panel If horizontal drain pan is not re moved depress tab in cabinet support rail to hold hori zontal drain pan in place See figure 21 7 Set unit so that it is level Connect return and supply air plenums as required using sheet metal screws WARNING If electric heat section with circuit breakers ECB29 ECB31 is applied to downflow CB31MV unit the circuit breakers must be rotated 180 to the UP position See ECB29 ECB31 installation in structions for more details NOTE For downflow application metal or class supply and return air plenums must be used For downflow installation on combustible flooring an addi tive base must be used See figure 24 COMBUSTIBLE FLOOR ADDITIVE BASE PROPERLY SIZE FLOOR OPENING FIGURE 24 Page 26 Cut an opening appropriately sized for combustible base Base dimensions are shown in figure 25 After opening has been cut set the additive base into opening Connect outlet air plenum to the additiv
56. he control box CFM can be obtained by positioning jumpers COOL HEAT and ADJUST on the BDC3 board The jumpers are labeled 1 2 3 and 4 Each enables a different air volume Diagnostic LEDs are pro vided as an aid in identifying the unit s mode of operation The LEDs are labeled RUN and CFM See figure 5 BLOWER SPEED ADJUSTMENTS Diagnostic LEDs RUN RUN indicates there is a demand for the blower motor to run LED indicates the the unit is operating according to the jumper settings The light flashes once for approximately every 100 CFM For example if the unit is operating at 1000 CFM CFM LED will flash 10 times If the CFM is 1150 LED will flash 11 full times plus one fast or half flash At times the light may appear to flicker or glow This takes place when the control is communicating with the motor be tween cycles This is normal operation The appropriate speed according to application and CFM need is selected by moving jumper pins Jumper Settings IMPORTANT Before changing jumper setting make sure the motor has completely stopped Any jumper set ting change will not take place while the motor is running Table1 shows the recommended factory blower speed tap selections for CB31MV series units These settings are for nominal tonnage match ups with the CB31MV When matched with other sizes it is recommended that the CFM be adjusted to approximately 400 CFM per ton
57. heir respective CFM volumes Notice that the normal adjustment setting for heat speed position 3 is 1315 The adjustment setting for that position is 1445 and for the adjustment setting is 1185 CFM After the ad justment setting has been determined chose the remainder speed jumper settings from those offered in the table in that row The TEST pin is available to bypass the BDC3 control and run the motor at approximately 70 to test that the motor is operational This is beneficial primarily in troubleshooting G must be energized for motor to run COOL The COOL jumper is used to determine the CFM during ei ther 1 cooling or 2 heat pump operation without a call for electric heat These jumper selections are activated for cooling when Y2 and DS terminals in CB31MV ener gized and for heating when Y2 is energized Applications without the Lennox SignatureStat or Effi ciency Plus CCB1 humidity control will provide 70 of the COOL CFM during first stage cooling for two speed outdoor units Units built prior to August 2002 will provide either 60 51 amp 65 series units or 65 41 series units of the COOL CFM during first stage cooling for two speed outdoor units 100 of COOL CFM is provided for systems with a single speed outdoor unit NOTE For two speed heat pumps blower will operate at 60 65 or 70 of COOL selection For single speed heat pumps blower will operate at 100 of COOL s
58. ification will operate as follows during a first stage cooling call two speed outdoor unit the air volume is 7096 of the COOL jumper selection For a normal COOL Pin 2 setting for CB31MV 41 the is 1125 the re duced speed is 788 1125 x 70 450 This arrange ment provides for additional dehumidification during stan dard first stage cooling See tables 12 and 13 for various scenarios concerning use of the SignatureStat and the CB31MV series unit For applications with Harmony 119 zone control the blower volume is determined by the Harmony control cen ter The minimum blower speed is predetermined at 650 CFM for 41 series units and 850 CFM for 51 and 65 series units This speed is not adjustable See footnotes in tables 2 and 3 With the thermostat set for Continuous Fan and without a call for heating or cooling the CB31MV will pro vided 5096 of the COOL CFM selected Page 6 CB31MV units built prior to February 2003 1 Pins Jumpered A Motor runs at 10096 until demand is satisfied B Once demand is met motor ramps down to stop A B OFF 100 COOLING DEMAND 2 Pins Jumpered A Motor runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes B motor runs at 100 until demand is satisfied C Once demand is met motor ramps down to stop B 7 1 2 82 COOLING DEMAND a 100 CFM OFF OFF
59. just Jumper at Setting Positions 0 0 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 Speed 185 210 240 265 285 330 360 385 1 1 om om Tom Tom w p Tom Tom Tom Tom us oo om pom oo me um omm pom 10 TABLE 3 BLOWER DATA CB31MV CB31MV 51 AND CB31MV 65 BLOWER PERFORMANCE 0 through 0 80 in w g 0 Through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions Jumper seg 1 10 3 a Tt us us em us em us em us em us em vs e sm se voe wes we m ues o 2146 we aa The effect of static pressure filter and electric heater resistance is included in the air volumes listed First Stage two speed units only cooling is approximately 70 60 for units built prior to August 2002 of COOL speed rating Production units September 2005 and later continuous blower speed for is approximately 38 of COOL speed setting Earlier production units continuous blower speed is approximately 50 of COOL speed setting Lennox Harmony II Zone Control Applications Minimum blower speed is approximately 850 cfm 400 L s CB31MV 51 AND CB31MV 65 BLOWER MOTOR WATTS AT Plus BDC3 SETTING BDC3
60. minutes the compressor will latch into high speed after a Y1 demand has occurred for that period of time Page 22 TABLE 11 TYPICAL CB31MV CCB1 and SINGLE SPEED OUTDOOR UNIT OPERATING SEQUENCE OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System Thermostat Relative Humidity Blower CFM Condition Demand EfficiencyPlus Lights COOL Comments Compressor demand and indoor blower Normal operation Y1 Acceptable None COOL speed follow thermostat demand Call for humidity re Acceptable None COOL Dehumidification mode begins moval during call Change amp no JRRO when relative humidity is for cooling over setpoint EH 2527 greater setpoint 60 65 When humidity demand is satisfied of COOL blower immediately shifts to the COOL CFM in order to hasten the end of the cycle Humidity demand Over Setpoint satisfied during ther mostat demand Change to Acceptable None COOL Call for cooling Over setpoint Off Dehumidification mode begins after call for when relative humidity is humidity removal Over setpoint 2 greater than setpoint o Over setpoint While unit is not operating no thermo 1 or more stat demand slide switch is moved down and back up Blower operates at COOL CFM Humidity demand sat isfied between thermo stat demands unit off Change to cycle Acceptable None Note When changing unit mode of operation from cooling to heating indicating li
61. move rail remove screw from rail at back of unit and at cabinet support rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air RIGHT HAND DISCHARGE CONFIGURATION UPFLOW DOWNFLOW HORIZONTAL DRAIN PAN DRIP SHIELD poser m 7 HORIZONTAL DOWNFLOW RAIL DRAIN PAN FIGURE 26 HANGING HORIZONTAL UNIT 1 2 13mm Screws max Electrical Inlet Clearance ANGLE IRON 4 in 102 mm SHEET METAL FRONT VIEW END VIEW FIGURE 27 CAUTION Danger of equipment damage and personal injury Take care when removing coil assembly from unit installed in right or left hand applications Coil may tip into drain pan once clear of cabinet Sup port coil when removing Page 27 E Horizontal Left Hand Discharge Application NOTE For horizontal applications above the ceiling a sec ondary drain pan is recommended Refer to local codes 1 Discard drip shields if applicable The shields are used for downflow applications only 2 Pull coil assembly from unit Pull off the horizontal drain pan 3 Remove drain plugs from back drain holes on horizon tal drain pan and re install them on front holes 4 Rotate drain pan 180 front to back and install it on the opposite side of coil 5 Remove screws from top cap Remove horizontal drip shield screw located in the center of the back coil end s
62. oler than the room thermostat setting Page 23 TABLE 13 CB31MV SignatureStat and TWO STAGE OUTDOOR UNIT OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Relative Humidity System x Ste Compressor Comments NO CALL FOR DEHUMIDIFICATION Normal Operation 24 N 6 54 blower follow thermostat ormal Operation demand ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING BASIC MODE only active on a Y1 thermostat demand 24 2 de energizes D 24 VAC PRECISION MODE operates independent of a Y1 thermostat demand Dehumidification 0 one we nay is SignatureStat will try to maintain room humidity Dehumidification 0 A Setpoint by allowing the call ONLY 1 On On On On Demand VAC High 603 69 room space to maintain a cooler room thermostat setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand 24 Dehumidificati 0 2 de energizes D PRECISION operates independent of a 1 thermostat demand 24 Dehumidification 0 Dehumidification 0 SignatureStat will try to setpoint by allowing the Jumpers at indoor unit with a two stage outdoor unit room space to maintain a With Condensing unit R to O cooler room thermostat With Heat Pump none setpoint Lennox SignatureStat used for these applications are 51M27 2 heat 2 cool or 51M28 2 heat 2 cool heat pump During dehumidifi
63. om terminal strips in control box e Install jumper between R and W1 e Turn on power to unit heat speed Blower should operate on e When check is complete disconnect power and replace delay setting to original position Page 8 Symptom Cause Procedure Motor rocks slightly when starting This is normal start up for the VSM Motor will not start no movement Check power at motor Check low voltage 24vac R to C at motor Check low voltage connection G Y R C at motor Check for unseated pins on motor harness Test with temporary jumper between R G Check motor for tight shaft Run moisture check Check for loose or compliant motor mount Motor qoot DUE WORE Sta Make sure blower wheel is tight on shaft Motor starts but varies up and down or intermittent Check line voltage for variation or sag Check low voltage connections Y at motor Check for unseated pins in motor hamess Check DS on terminal strip for CFM command Check system controls thermostat Perform moisture check Motor Hunts or Puffs at high CFM If removing panel or filter reduces Puffing reduce restriction or reduce max airflow Stays at low CFM despite system call for cool or heat CFM Stays at high CFM Check low voltage thermostat wires and connections Verify fan is not in delay mode Check R missing not connected to motor Perform VSM check Check R connection at motor Check fan del
64. omponents must be matched ac cording to Lennox recommendations for the unit to be covered under warranty Refer to the Engineering Handbook for approved system matchups A misapplied system will cause erratic operation and can result in early unit failure The units come with factory installed check and expansion valve for all applications It has been installed internally and is accessible if required II UNIT COMPONENTS A Control Box The CB31MV control box is shown in figure 2 Line voltage and electric heat connections are made in the control box Optional electric heat fits through an opening located in the center of the control box When electric heat is not used knockout plates cover the opening The electric heat control arrangement is detailed in the electric heat section of this manual B Terminal Strips TB1 and TB2 CB31MV units are equipped with two low voltage termi nal strips TB1 and TB2 located in the control box See fig ure 2 The strips are used for making up all indoor thermo stat wires On Board Jumpers CB31MV units manufactured January 2002 and later CB31MV units manufactured January 2002 and later will have factory installed jumpers connecting DS to Y1 R to O and Y1 to Y2 These jumpers will have to be removed in certain unit application See the table below Harmony Il CCB1 or DS to Y1 SignatureStat Heat Pump RtoO Two Stage Cooling Y1 to Y2 C Transformer T1 CB31MV seri
65. on control pins will destroy motor Make sure pins are fully seated in connector and housing 9 Verify common connection from transformer C or to C1 C2 Pin 1 and Pin 3 e Once common is verified test motor by applying 24vac R to control pins Page 9 TABLE 2 BLOWER DATA CB31MV CB31MV 41 BLOWER PERFORMANCE 0 through 0 80 in w g 0 Through 200 Pa External Static Pressure Range BDC3 Jumper Speed Positions umper Seting 2 3 J 4 1 2 5 4 pem ue om us o em ue em e 0 em e accom The effect of static pressure filter and electric heater resistance is included in the air volumes listed First Stage two speed units only cooling is approximately 7096 6596 for units built prior to August 2002 of the COOL speed rating Production units September 2005 and later continuous blower speed for is approximately 3896 of COOL speed setting Earlier production units continuous blower speed is approximately 5096 of COOL speed setting Lennox Harmony Zone Control Applications Minimum blower speed is approximately 650 cfm 305 L s I aer BLOWER MOTOR WATTS Plus BDC3 SETTING 897288 Watts Various External Static wg Adjust Jumper at Setting Speed COOL Speed HEAT Speed COOL Speed BDC3 Jumper Speed Motor Watts Various External Static Pressures in wg Pa Ad
66. only and do not supersede or replace local or state codes TABLE OF CONTENTS IntroductioN 2 eee eee 1 Specifications 2 l Application 4 Il Unit Components 4 Ill Troubleshooting the 8 IV Optional Electric Heat 12 V Optional Humidity Control 18 VI Configuration Modifications 25 VII Start Up Operation 29 VIII Operating Characteristics 30 XI Maintenance 30 X Wiring and Operation Sequence 31 Publications Page 1 ELECTROSTATIC DISCHARGE ESD Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components Take precautions during unit instal lation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the control and the technician at the same electrostatic potential Neutralize electro static charge by touching hand and all tools on an unpainted unit surface before performing any service procedure 1996 Lennox Industries Inc SPECIFICATIONS CB31MV Net face area 1 2 m2 5 0 0 46 7 22 0 67 7 22 0 67 Tube outside diameter in mm 3 8 9 5 3 8 9 5 3
67. ove the downflow rail closest to the drain pan To remove rail remove screw from rail at back of unit and at cabinet support rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air 10 Flip access door Knock out the portion of door for the drain pipes and attach to the cabinet with screw pro vided Replace access door on the unit 11 Set unit so it is sloped toward the drain pan 1 4 6mm Connect return and supply air plenums as quired using sheet metal screws 12 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is sup ported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 27 Connect return and supply air plenums as required using sheet metal screws Page 28 F Condensate Drain 5 127mm section of PVC pipe is provided with the unit Cut the pipe in half and use to route the auxiliary and main drains Connect main condensate drain and route downward to an open drain or sump Do not connect drain to a closed waste system Refer to figure 31 for typical condensate trap configuration TYPICAL CONDENSATE DRAIN CONNECTION PIPE DIAMETER DIFFERENCE MINIMUM 1 INCH 25 mm PITCH PER 10 FEET 304
68. pable of absorbing more moisture away from the skin thereby increasing the cooling effect When the CCB1 senses that the indoor humidity level is above the control setpoint the control places the CB31MV and outdoor unit in a dehumidification mode in order to take advantage of the dry air cooling effect To produce drier air the CB31MV will slow down the speed of the air crossing the indoor coil Because the air is moving much slower than normal the indoor coil is allowed more time to remove moisture from the air a higher percentage of the air passing over the coil is cooled to its dew point re moving more moisture At the same time the two speed outdoor unit will switch to high speed to produce a colder indoor coil The colder indoor coil and slower moving air combine to produce drier supply air NOTE The indoor blower speed is reduced in order to slow the air speed across the indoor coil The supply air exiting the unit may not feel as forceful This is normal Remember that when the unit is in dehumidification mode the comfort level is increased because the unit is producing cooler drier air The exact sequence of operation to produce cooler drier air is described in the following section Operation The CCB1 operates only during cooling mode During nor mal cooling operation when there is no indoor humidity de mand the unit operates as a straight two speed cooling system First stage thermostat demand energizes the com
69. tacts to close When the relay is de energized the disk cools and the contacts open The relays energize A Matchups and Ratings different stages of heat as well as the blower The blower is always first on and last off 3 Circuit Breaker CB1 CB2 and CB3 208 230 volt only Tables 5 and 6 show all approved CB31MV to ECB29 ECB31 matchups and electrical ratings Line voltage connections are made to circuit breakers B Electric Heat Components CB2 in the electric heat sections with circuit breakers designated by CB in the model numbers Table 4 shows the amp rating for each circuit breaker used Single phase electric heat uses two pole circuit breakers while three phase electric heat uses three pole circuit breakers ECB29 31 parts arrangement is shown in figures 7 through 11 All electric heat sections consist of components mounted to the electric heat vestibule panel and electric heating elements ex posed directly to the airstream 208 230V electric heat sec tions may be equipped with circuit breakers The circuit breakers are designated by CB in the model number TABLE 4 ECB29 31CIRCUIT BREAKERS Both the primary S15 and secondary S20 limits lo cated the electric heat vestibule panel and exposed 29 5 P directly to the airstream through an opening the panel 29 8 1 P 50AMP The high temperature limits are SPST N
70. wer and coil as semblies can also be removed 5 Reassemble once the cabinet is in place B Upflow Application 1 Discard drip shields if applicable The shields are used for downflow applications only and are located with the foam pads on top of unit For best efficiency and air flow the horizontal drain pan should be removed from units in upflow configu rations 3 After removing horizontal drain pan place unit in de sired location Set unit so that it is level Connect return and supply air plenums as required using sheet metal screws See figure 20 UPFLOW CONFIGURATION HORIZONTAL DRAIN PAN UPFLOW DOWNFLOW DRAIN PAN a FOR OPTIMUM PERFORMANCE REMOVE HORIZONTAL DRAIN PAN FIGURE 20 Page 25 C Downflow Application 1 Remove drip sheilds shipped with the foam pads from top of unit The shields are used for downflow applica tions only and may need to be field fabricated if no longer with unit 2 Remove coil assembly from unit 3 Remove horizontal drain pan See figure 21 DOWNFLOW DISCHARGE CONFIGURATION FOR OPTIMUM PERFORMANCE REMOVE HORIZONTAL DRAIN PAN DOWNFLOW DRAIN PAN FIGURE 21 4 Rotate cabinet 180 from upright It may be neces sary to first remove the blower assembly to lighten the cabinet for lifting 5 Install downflow drip shield firmly in place on inside of coil slab from under drain pan See fi
71. weris energized on heat ing speed and economizer heat relay K20 2 is en ergized see unit schematic figure 26 Assuming the N C primary 815 and secondary S20 limit switches are closed electric heat element HE1 is en ergized SECOND STAGE HEAT remove jumper between W2 and R 4 5 When K32 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relay K33 with 24VAC When K33 1 closes assuming the N C primary 815 and secondary S20 limit switches are closed electric heat element HE2 is energized Page 34 ARRANGEMENT DESCRIPTION COMPONENT CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER ELECTRIC HEAT ELEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT SWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY A a fox L2 CB2 EQUIPMENT GROUND r CIRCUIT a Y L2 EQUIPMENT GROUND LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT T gt gt O REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT PROTECTION SIZE NOTE USE COPPER CONDUCTORS ONLY WIRING DIAGRAM 10 95 HEATING
72. y high temperature limits Page 12 5 CB31MV 41 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT CB31MV 41 Number Vols KW Bh Fuse Size Model Number Load Amps Circuit 1 Circuit 2 Circuit 1 Circuit 2 5 kW ECB29 5 28K31 1step 208 38 12 800 43 28 ME 30 4168 220 42 14300 43 31 E 35 30A Circuit breaker 230 46 15700 43 31 s 35 o 240 5 0 17 100 43 31 m 35 One 6 kW ECB29 6 47L22 1step 208 45 15400 43 32 x 35 ee 4 lbs 220 50 17100 43 37 mi 40 35A Circuit breaker 230 55 18800 43 37 se 40 Ho 240 6 0 20500 43 37 TAE 40 8 kW 29 8 28833 2 steps 208 60 20500 43 41 m 45 Re 5155 220 67 22900 43 47 m 50 45A Circuit breaker 280 73 25400 43 47 50 e 240 80 27300 43 47 m 50 kW 299 10111 25565 208 68 23 100 43 46 50 m aes AKEN 220 76 25 800 43 52 60 Zo 50A Circuit breaker 230 83 28 200 43 52 60 240 90 30700 43 52 dM 60 125 kW 29 12 5 28037 3steps 208 94 32000 43 24 4 220 105 35 800 43 27 35 30 50 1 25 8 1 50A Circuit breaker 230 115 39 200 43 27 35 30 50 240 125 42600 43 27 35 30 50 15 kw 29 15 28 38 3steps 208 113 38400 4 3 28 37 30 750 12168 1 220 126 43 000 43 31 42 35 60 1 30A amp 1 60A Circuit breaker 230 138 47000 43 31 42 35 60 240 150 51200 43 31 42 35 60 20 kW

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