SERVICE MANUAL FOR 6795B,C,D SERIES
Contents
1. Do U 5 Q re SB A 8 FIGURE 8 10 OUTDOOR BLOWER MOTOR REMOVAL It will be necessary to remove the top panel of the 7 unit Remove 4 screws that attach scroll housing to basepan See 1 Figure 9 9 Disconnect wiring from motor terminal block 10 Remove scroll motor assembly from the unit Note If at this point only the blower wheel needs replaced then remove 4 screws from inboard venturi Remove and replace blower wheel see note or else go to Step 6 Disconnect wiring at capacitor 14 Remove 4 screws from venturi See 1 Figure 10 Remove 4 screws from motor mount bracket See 2 Figure 10 Remove motor assembly from scroll Remove blower wheel and motor mounting bracket Upon reassembly the references made on Figures 9 and 10 shall be used for proper reassembly BOTTOM VIEW FIGURE 9 1 Wheel must be mounted with a minimum of 1 4 clearance to both venturis 2 Apply grease to motor shaft before assembling wheel 3 Torque set screw on flat of shaft to 150 in Ibs 15 SIDE VIEWS FIGURE 10 1 Position motor with terminal block opposite motor mount clamp 2 Torque nut to 65 in lbs min2. 21 17 Quick Troubleshooting 22 18 Electrical Flow Charts Sequence Of 23 1 WARNINGS IMPORTANT NOTICE These instructions are for the use of qualified individuals specially trained and experienced in installation of this type equipment and related system components Installation and service personnel are required by some states to be licensed PERSONS NOT QUALIFIED SHALL NOT INSTALL NOR SERVICE THIS EQUIPMENT NOTE The words Shall or Must indicate a requirement which is essential to satisfactory and safe product performance The words Should or May indicate a recommendation or advice which is not essential and not required but which may be useful or helpful WARNING SHOCK HAZARD To prevent the possibility of severe personal injury or equipment damage due to electrical shock always be sure the electrical power to the appliance is disconnected CAREFULLY FOLLOW ALL INSTRUCTIONS AND WARNINGS IN THIS BOOKLET TO AVOID DAMAGE TO THE EQUIPMENT PERSONAL INJURY OR FIRE WARNING Improper installation may damage equipment can create a hazard and will void the warranty The use of components not tested in combination with these units will void the warranty may make the equipment in violation of state codes may create a hazard and may ruin the equipment
3. blower to high speed with Comp 2 operation Red light indicates System 2 compressor relay has made and O D blower running on high speed System 32 power Red light indicates O D blower operation low speed System 1 4 L1 Power from System 1 compressor energizes O D blower relay low speed on terminal board T11 115V line L1 power output to O D blower low speed System 1 T5 System 1 common lead L2 to O D blower relay low speed through normally closed contactor on switching relay T13 115V comp L2 power lead output to O D blower high or low speed T8 System 2 common L2 power to switching relay and O D blower relay high speed T12 115V line L1 power output to O D blower high speed System 2 12 VDC coil makes Circuit 2 to Comp 2 Freeze Switch R FY Freeze Switch 12 VDC Exclusion Relay Exclusion Relay Cooling Cooling 12 Compressor 2 Compressor 1 GL W GH Indoor Fan Heat Indoor Fan Low Pump High FIGURE 14 Plug positions on the p c board If no voltage is detected at the p c board connector check for voltage at the thermostat All functions of this air conditioning unit are subject to thermostat time delays according to the operation manual 17 QUICK TROUBLESHOOTING CHART Problems Nothing Runs No Compressors No Fans No Compressor Indoor and Outdoor Fans Run Indoor Fan Runs No Compress
4. 3 Ground wire terminal assembles between screw head and washer Wrap wire around motor mount leg to take up slack 4 Wire tie capacitor wires to mount leg 6795 Model Pillow Block Bearing Outdoor Bearing Bracket 16 11 CAP TUBE REPLACEMENT Remove top panel 7 Unbraze cap tube assembly assemblies from points See 1 and 22 Figure 12 Make note of plumbing Remove indoor blower assembly access panel and cap tube locations the replacement tubes will have to go back to the same locations Remove screws to wirebox See Section A 1 Figure 11 This will allow wirebox to be pulled 8 Cut wire ties holding cap tube assemblies to other slightly away from unit Freeze switch will plumbing and remove assembly probably pull off evaporator when wirebox is moved Be sure to reattach it upon reassembly 9 Unbraze liquid line See 3 Figure 12 from old strainer cap tube and replace with new Remove screws from step panel See Section B 2 Figure 11 Panel can now be pulled slightly away Note Upon reassembly the references made on from cap tubes Figures 11 and 12 shall be used for proper reassembly The assemblies shall be Remove corner panel See Section C Figure 11 secured with wire ties in order to prevent excess chafing and vibration Be certain at this point that the refrigerant charge has been removed from the system systems being
5. Replace Thermostat 12 VDC To Pin Connectors GH amp B On P C Board NO Check Pin Connectors And Connection From Thermostat Replace Lifeline If Necessary See Figure 14 o 115 VAC To N O Contact On Relay 4 And T5 On NO Replace P C Board P C Board See Figure 13 o Check Wiring To Motor Check NO Reconnect Wiring Or Capacitor And Motor Windings Replace Capacitor Or Motor If Necessary For Open Or Ground 26 COMPRESSOR 1 CHECKOUT THERMOSTAT CALLING FOR COMPRESSOR Note operating functions subject to thermostat time delays Restore Power Green L E D Light 115 VAC To System 1 NO Also To T amp T5 On P C Board 14 12 VDC To Y1 amp B On Thermostat NO p 12 Remember Time Delays T d tar 5 OK Check All Pin Terminals And Conncctors To NO 12 VDC To Pin Connectors Thermostat Replace Y amp B On P C Board Also T2 Lifeline If Necessary amp T3A See Figure 14 K Q Green L E D Light On Replacc Relay If 12 VDC Is Present And NO Check Compressor 1 Relay Will Not Close Or If Relay If Welded Relay Operation Reconnect Wires Or NO K Check Compressor 1 Start Device Check For Proper Replace Components As Necessary Wiring To Compressor Check Compressor Run Capacilor Check Motor Windings Fo
6. The fan operates continuously at low speed Move the fan switch to HIGH ON The fan operates continuously at high speed Move the fan switch to LOW AUTO the fan will stop Move the fan switch to HIGH AUTO the fan will remain off Adjust the COOL SET setpoint 5 below room temperature and return to ACTUAL if the thermostat has been powered for more than 3 minutes 1 stage cooling and the cooling fan will come on approximately 1 minute later If the thermostat has not been powered for more than 3 minutes 1 stage cooling and the cooling fan will come on anywhere from 30 seconds to minutes later 274 stage cooling will come on approximately 30 seconds after the 1 stage With the fan switch in HIGH AUTO the fan will operate at high speed and cycle with stage 1 compressor Move the fan switch to LOW AUTO The fan will operate at low speed and cycle with stage 1 compressor Once both stages of cooling and both fan speeds have been verified adjust COOL SET setpoint 1 below room temperature and return to ACTUAL After 15 to 30 seconds 2 stage cooling will turn off while 1 stage remains on 4 6795 3451 SERIES THERMOSTAT OPERATIONS AND SPECIFICATIONS SET TEMP RANGE DISPLAY TEMPERATURE SCALE DISPLAY FORMAT RESOLUTION ACCURACY SAMPLING RATE POWER SOURCE OPERATING TEMPERATURE OUTPUT LOAD SAFEGUARDS 55 TO 90 DEGREES F 20 TO 160 DEGREES F DEGREES FAHRENHEIT LIQUID CRYSTAL DISPLAY ONE DEG
7. blower operates continuously at high speed Stage 1 and Stage 2 compressors cycle on and off as needed 4 Momentary Buttons There are three momentary buttons Momentary buttons are activated by depressing the center of the button The buttons are as follows MODE Depressing this momentary button advances the display mode from ACTUAL to COOL SET HEAT SET and back to ACTUAL When using the mode button you are indicating your desire to check or adjust the setpoint temperatures for either COOL SET or HEAT SET The cool setting determines the temperatures at which the air conditioner will start operating The heat setting determines the temperature at which the heating system will start operating For instructions concerning changing these setpoints see Adjusting Setpoint Up Button Increases the temperature setpoint Down Button Decreases the temperature setpoint ADJUSTING SETPOINT To adjust the setpoint of either heating or cooling press the MODE button until the arrow on the left side of the display indicates the desired setpoint to be changed either COOL SET or HEAT SET The display will indicate the current setpoint of the thermostat Press the UP button or the DOWN button to change the setpoint Once the new desired setpoint is displayed press the MODE button until the arrow is pointing to ACTUAL If the thermostat is left in the COOL SET or HEAT SET modes the display will return to ACTUAL in approximat
8. 2 UNIT DIMENSIONS AND SPECIFICATIONS PACKAGE AIR CONDITIONER MODEL NUMBER BREAKDOWN FOLLOWS 1 Single Compressor System 2 Two Compressor System Revision Model Series ERE 2 Right Hand Unit 3 Left Hand Unit 6 Panasonic Compressor s 7 Sanyo Compressor s 8 Tecumseh Compressor s UNIT SPECIFICATIONS AND IDENTIFICATION 6795B832 MODELNUMBER SERIAL NUMBER FOR OUTDOOR USE m USE THERMOSTAT 6795 345 ELECTRICAL RATINGS 115 VAC 60 HZ PHASE CIRCUIT 1 CIRCUIT 2 106 COMPRESSOR RLA 10 6 1450A200 670 LRA MOTOR LRA 67 0 THERMALLY 114 BCSC PROTECTED BCSC 114 24 FLA LD BLOWER FLA N A MOTOR DATA HORSEPOWER 1 5 O D BLOWER HORSEPOWER 1 3 19 5 AMP MINIMUM CIRCUIT CAPACITY 18 0 MAXIMUM OVERCURRENT AMP 20 PROTECTIVE DEVICE 20 215 07 R 22 CHARGE WEIGHT 07 215 MINIMUM EXTERNAL STATIC PRESSURE 4IN H 0 10 25 MIN SUPPLY 0 25 12 CONDUCTOR GAUGE COPPER n H0 25 40 UTILISER DES FILS 25 40 10 D ALIMENTATION EN 8 40 63 CURVE 40 63 48 CAUTION RISK OF ELECTRIC SHOCK DISCONNECT ALL POWER BEFORE OPENING PANEL TWO DISCONNECT SWITCHES REQUIRED ATTENTION DEBRANCHER LE BLOCK D ALIMENTATION INSTALLE A DISTANCE AVANT D ENTREPRENDRE LE DEPANNAGE RV PRODUCTS A DIVIS
9. BUR E 3 2 COuPR START DEVICE gt BLK 2 2 COuPR RUN 25 370 CAPACITOR 1 COMPRESSOR RELAY 12 5 370 OUTDOOR BLOWER COMPRESSOR s 2 COMPRESSOR RELAY IDENTIFIED TERMINAL NOTE HIGH VOLT WIRING 115 V SHOWN BOLD LOW VOLT WIRING 12 V SHOWN FINE P C BOARD CIRCUIT SHOWN DASHED 20 Green L E D Light indicator System 1 line power OK Freeze switch is closed 12 VDC from thermostat OK Exclusion relay energized from System 1 115V power closes FF circuit to thermostat unless freeze switch is open Indoor Blower High K5 12 VDC coil 1 polerelay energized from GH on the thermostat makes Circuit 1 to high speed motor tap 2 12 VDC from Y 1 on thermostat to Compressor 1 relay T3A T3B 12 VDC from thermostat T10 12 VDC from Y2 on thermostat to Compressor 2 relay Indoor Blower Low K6 12 VDC coil 1 pole relay energized from GL on the thermostat makes Circuit 1 to low speed motor tap Supply Ground Terminals FIGURE 13 cas 115 INDOOR HIGH BLOWER T1 System 1 power L1 to indoor blower relays high and low Also power to exclusion relay T9 Energizes O D high speed relay and switching relay power comes from Comp 2 relay gt owen Low Z OY 2 12 VDC coil makes Circuit 1 To Comp 1 21 16 WIREBOX COMPONENT CHECKOUT Switching Relay Switches
10. all preceding steps have been confirmed good Do Not start in the middle of any chart without knowing everything previous upward on the chart is OK or you may replace the wrong part When using a jumper wire to diagnose a low voltage problem Never Short Any Positive Terminal to Ground or the Terminal Marked Serious thermostat or p c board damage may occur 6795B SERIES OPERATION SEQUENCE NO Refer to Checkout em bx No Green L E D Light Thermostat Call Indoor Blower Refer to Indoor NO NO Refer to Indoor Low Checkout High Checkout Comp 2 NO Refer to 2 Operation O D Blower High L E D O D Blower NO Refer to Outdoor Hig Blower High NO Refer To 1 Checkout 1 O D Blower e Low LED Refer to Outdoor NO OD Blower Blower Low Low 23 CHECK NO GREEN L E D LIGHT FY Y CIRCUIT TO THE THERMOSTAT YES Green L E D Light N 115 Circuit 1 High Voltage Board Use Jumper Wire Across Thermister Terminals On P C Board YES OZ Check 12 VDC To Pin Connectors R amp B In P C Board See Figure 14 NO Replace P C Board If All The Above Checks Out OK And Green Light Does Not Come On Refer To 6795B Series Operation Sequence Problem Is Not In FY F Circuit To The Thermostat Restore 115 VAC Power To 1 Circuit If Green Light Comes On Check The Evaporator Coil For Freeze Situation Warm Coil Temperat
11. serviced Indoor Blower Indoor 2 3 3 ee Section A Section Outdoor Coil Section C FIGURE 11 17 12 EVAPORATOR REPLACEMENT Refer to cap tube replacement Steps 1through 7 Unbraze discharge lines from points See 4 Figure 12 and remove condenser coil from unit Remove screws from bottom of step panel See 6 Figure 12 Unsnap freeze switch located on indoor blower side of evaporator coil pull top of indoor blower assembly outward if necessary Pull step panel slightly off to one side Unbraze suction lines from points See 5 Figure 12 Protect wiring and insulation from torch flame 18 T Remove screws See 7 8 amp 9 Figure 12 Evaporator coil can now be removed Note Upon reassembly the references made on Figures 11 and 12 shall be used for proper reassembly The assemblies shall be secured with wire ties in order to prevent excess chafing and vibration If additional sealant is needed to seal coil header to drain pan notched end a silicone or perma gum sealant is adequate Do not use solvent base sealers that would harm the ABS plastic drain pan 13 CONDENSER REPLACEMENT Remove top panel Remove screws along wirebox side of coil See 10 Figure 12 Remove corner panel See Section C Figure 11 Be certain at this point that the refrigerant charge has been r
12. D AFTER 2 MINUTES DEFAULT VALUES OF 68 F HEATING 78 F COOLING ARE AUTOMATICALLY PROVIDED UPON RESTORATION OF POWER THERMOSTAT CONTROL PANEL DISPLAY DELAYED MINUTE AT TURN ON ACTUAL s LA HEAT ov SET TEMPERATURE MODE UP DOWN SYSTEM COOLING COOL HIGH AUTO HEAT LOW OFF HIGH ON A OPERATION Your air conditioner is operated from the control panel 2 located on the electronic wall mounted thermostat When the furnace is connected to this thermostat it will be operated from the same control panel Identification and operational descriptions for all control panel switches and display are listed below 1 Liquid Crystal Display We will start with the display because the display will be illuminated any time the system is in operation The display will remain illuminated as long as either a the system switch hasn t been placed into the off position for longer than 2 minutes b the power to the thermostat hasn t been disconnected for longer than 2 minutes The display shows the operator both the mode of the display indicated by the arrow at the left side of the display and the temperature for that mode There are three display modes they are ACTUAL COOL SET and HEAT SET The operator may choose the mode they desire to view by depressing the MODE switch Each time the MODE switch is depressed the display advances to the next mode If the display is lef
13. ION OF AIRXCEL INC WICHITA KS 67204 LISTED ROOM AIR CONDITIONER D 5K09 C DESIGN PRESSURES HI SIDE 300 PSIG LO SIDE 150 PSIG 6795B832 X MODEL NUMBER SERIAL NUMBER 3 6795 6651 SERIES THERMOSTAT OPERATION AND SPECIFICATIONS SET TEMPERATURE RANGE DISPLAY TEMPERATURE SCALE DISPLAY FORMAT RESOLUTION ACCURACY SAMPLING RATE POWER SOURCE OPERATING TEMPERATURE OUTPUT LOAD SAFEGUARDS DEFAULT MODE The control panel is built into the wall mounted thermostat The thermostat and control panel are operated from a 12 VDC electrical circuit The control panel contains the following switches A Liquid Crystal Display 2 Slide Switches 1 System Switch 1 Cooling Fan Switch 3 Momentary Buttons 1 Up Button 1 Down Button 1 Mode Button 40 TO 90 F 14 TO 135 9 F DEGREES FAHRENHEIT LIQUID CRYSTAL DISPLAY 1 10 DEGREES FAHRENHEIT 1 OF DISPLAY TEMPERATURE RANGE EVERY 10 TO 15 SECONDS 12 VDC NON REGULATED NON FILTERED 2 VOLTS 10 TO 55 DEGREES CELSIUS 40 mA MINIMUM TO 1 5 AMP MAXIMUM FOR EACH OUTPUT T STATIC ELECTRICITY PROTECTION TO END USER AFTER INSTALLATION ANTI STATIC PACKAGING TO BE USED FOR SHIPMENT REVERSE POLARITY PROTECTION ON AND B TERMS SPIKE PROTECTION TO 400 VDC ON TERMINAL CONFORMAL COATING ON P C BOARD PROTECTION FROM MOISTURE X X USER SELECTED SETPOINTS TO BE RETAINED MINIMUM 2 MINUTES AFTER POWER HAS BEEN REMOVE
14. Psp RV Products A Division of AIRXCEL Inc SERVICE MANUAL FOR 6795B C D SERIES PACKAGED AIR CONDITIONERS TABLE OF CONTENTS 1 Warnings ese Pom 2 2 Unit Dimensions And 3 3 6795 6651 Series Thermostat Operation And Specifications 5 4 6795 3451 Series Thermostat Operation And Specifications 8 5 Unit Depiction 10 6 Blower Performance Chart 12 7 Wiring Diagram Electric 12 8 Accessibility Of 13 9 Indoor Blower Motor Removal 13 10 Outdoor Blower Motor 1 14 11 Tube Replaceme ntsc xs 34 e s e Rer ee RR Ros e xs SS oe bone 17 12 Evaporator Coil 18 13 Condenser Coil 19 14 Compressor 19 15 Wiring Diagram 20 16 Wirebox Component
15. R AIR OPENING CABINET DOOR FIGURE 5 CONDENSER COIL ELECTRICAL BOX DOOR CONDENSER DISCHARGE AIR OPENING A C BOTTOM CONDENSATE DRAIN OPENING FIGURE 6 11 6 PACKAGED AIR CONDITIONER BLOWER PERFORMANCE DATA TEST CONDITION 115 VAC 60 HZ 1 PH DRY COIL EXTERNAL STATIC PRESSURE INCHES OF WATER COLUMN 5 ES Pa m un E EXTERNAL STATIC PRESSURE INCHES OF WATER COLUMN HIGH SPEED OPERATION TO FURNACE CONTROL ORG CHART 1 7 WIRING DIAGRAM ELECTRIC THERMOSTAT Electronic Wall Thermostat Assembl 12 VDC SYSTEM 5 SWITCH N Ist STAGE COOL Li COOL 6795 5451 n FAN WALL THERMOSTAT 2 UE ASSEMBLY c x HEAT 2nd STAGE COOL o o 9 d BU 30 SEC 2 MIN ir DELAY ON DELAY ON 1 A MAKE BREAK INO MEE 2 5 3 B T 4 _2 MIN 30 SEC DELAY ON DELAY ON Ww BREAK MAKE W R B F Y2 mE 12 12 L WHT BLK e 6795B4 351 LIFELINE FAN SWITCH 8 ACCESSIBILITY OF APPLIANCE The accessibility of this appliance will vary from one technicians judgement the best method of attaining access to installation to another It shall be left to the service perform se
16. REE F 2 OF DISPLAY TEMPERATURE RANGE EVERY 30 SECONDS 12 VDC NON REGULATED NON FILTERED 2 VOLTS 10 TO 55 DEGREE C 40 mA MINIMUM TO 1 5 AMP MAXIMUM FOR EACH OUTPUT STATIC ELECTRICITY PROTECTION TO END USER AFTER INSTALLATION ANTI STATIC PACKAGING TO BE USED FOR SHIPMENT SPIKE PROTECTION TO 400 VDC ON R TERMINAL CONFORMAL COATING ON P C BOARD PROTECTION FROM MOISTURE THERMOSTAT CONTROL PANEL 6795B3451 Thermostat Sub base Coleman 85 Hach 75 HIGH 15 COOL FAN LOW aTa 65 OFF LOW ON HEAT HIGH 60 SYSTEM E BUILT IN TIME DELAYS AND FUSE PROTECTION 2 FIGURE 1 A OPERATION 1 System Switch The system switch has four positions to control the operation of the heating and air conditioning systems They are as follows COOL When in the COOL position 1 and 2 stage cooling will cycle from the cooling system setpoint Blower operation will be controlled by the position of the Cooling Fan switch HEAT When in the HEAT position the heating system will cycle from the heating system setpoint The heating blower will operate per the heating system manufacturer specifications OFF When in the OFF position no thermostat or system operation will occur The liquid crystal display will indicate room temperature until backup power is depleted ap
17. blower will operate per the heating system manufacturer specifications OFF When in the OFF position no thermostat of system operation will occur The liquid crystal display will indicate room temperature until backup power is depleted approximately 2 minutes FAN When in the FAN position the cooling blower will operate continuously at high speed Cooling Fan Switch The fan switch has four positions from which to control the operation of the cooling blower The fan switch controls operation of the cooling blower only after the system switch is placed into the COOL position With the system switch in any other position the fan switch will have no effect on the operation of the cooling blower Fan switch positions and their resulting function are listed below HIGH AUTO When in the HIGH AUTOMATIC position the cooling blower operates at high speed and cycles off and on with the 1 stage compressor 2 stage cooling will cycle on and off as needed having no effect on cooling blower operation LOW AUTO When in the LOW AUTOMATIC position the cooling blower operates at low speed and cycles off and on with the 1 stage compressor 2 stage cooling will cycle on and off as needed having no effect on cooling blower operation LOW ON When in the LOW ON position the cooling blower operates continuously at low speed Stage 1 and Stage 2 compressors cycle on and off as needed HIGH ON When in HIGH ON position the cooling
18. ely three minutes After the display has been returned to ACTUAL it takes 15 to 30 seconds for the thermostat to recognize the changes made to the setpoints B TESTING Place the thermostat system switch into the OFF position Once all safety precautions have been met reinstate power to all systems thermostat cooling and heating OFF Starting with the system switch in the OFF position the display will be blank and no part of either the cooling or heating systems will be operating FAN Move the system switch to FAN The display indicates room temperature The cooling system fan operates continuously at high speed No other components or systems are operating HEATING Move the system switch to HEAT The display will indicate room temperature Adjust the HEAT SET setpoint of the thermostat above the room temperature displayed and return the arrow to the ACTUAL position After 15 to 30 seconds the heat circuit of the thermostat will activate the heating controls Once the heat has turned on and is running adjust the HEAT SET setpoint below the room temperature displayed and return the arrow to the ACTUAL position After 15 to 30 seconds the heat circuit of the thermostat will turn off and deactivate the heating controls COOLING Move the system switch to COOL The display will indicate room temperature Adjust the COOL SET setpoint to 3 to 5 above room temperature and return to actual Move the fan switch to LOW ON
19. emoved from the systems Make note of plumbing locations The plumbing will have to go back to the same locations on the new coil Unbraze discharge and liquid lines at points 2 and 4 Figure 12 Remove condenser coil 14 COMPRESSOR REPLACEMENT Remove compressor access panel The top panel may be removed at this point if it allows technician better access to perform service Remove refrigerant charge from system systems being serviced Remove terminal caps See 13 Figure 12 Remove wiring from compressor terminal block cut wire ties on suction line 19 Unbraze plumbing at points 11 and 12 Figure 12 protect any wiring and insulation from torch flame Remove mounting nuts and washers See 14 Figure 12 Remove compressor from unit Note Upon reassembly compressor wires shall be wire tied to suction lines to prevent excess chafing 15 WIRING DIAGRAM THERMOSTAT Wiring Diagram Electronic Thermostat Page 12 PRINTED CIRCUIT CONTROL BOARD 2 SEC DELAY ON MAKE RATS 2 SEC FTIR SS DELAY S 1 1 RED V7 L E D E D 1 0 HIGH BLOWER BLK 1 0 LOW BLOWER M J lt YEL x x 1 BLK WT BLK WHT CIRCUIT 1 CIRCUIT 2 WHT HIGH VOLT TERM BOARD FREEZE SWITCH BRN WHT RED CAPACITOR 7 5 370 INDOOR BLOWER COMPRESSOR 2 DD 1 COMPR START DEVICE sI COMPR RUN CAP 25 370 BRN WHT
20. f the thermostat has not been powered for more than 3 minutes 1 stage cooling and the cooling fan will come on anywhere from 30 seconds to 3 minutes later 244 stage cooling will come on approximately 30 seconds after the 1 stage With the fan switch to HIGH AUTO the fan will operate at high speed and cycle with stage 1 compressor Move then fan switch to LOW AUTO The fan will operate at low speed and cycle with stage 1 compressor Once both stages of cooling and both fan speeds have been verified adjust setpoint 1 below room temperature After 15 to 30 seconds 2 stage cooling will turn off while 1 stage remains on Adjust COOL SET setpoint to a temperature above room temperature and return to ACTUAL After 15 to 30 seconds both 1 stage cooling and the cooling fan will cycle off 1 stage cooling cannot be restarted until a 3 to 3 1 2 minute time delay has occurred 5 UNIT DEPICTION FIGURES LONG GASKETS RETURN GASKET SUPPLY GASKET CONTROL WIRI RECEPTACLE NG POWER WIRING ENTRIES P DOOR amp RETURN AIR GASKET MAY BE INTERCHANGED TO ACCOMODATE A SIOE INLET RETURN FIGURE 1 5 165 OVERALL FIGURE 3 10 FIGURE 2 35 A C TOP TOP RETURN AIR OPENING T 26 SUPPLY AIR o un DISCHARGE FIGURE 4 RETURN AIR OPENING COVER ELECTRICAL BOX SIDE SIDE RETURN COMPRESSO
21. lose Or If Relay Is Welded Reconnect Wiring Or Replace Components As Necessary Outdoor Blower System 1 Red L E D Low Speed See Figure 13 Line Volts 115 VAC To Terminal T4 amp T5 On P C Refer To Compressor 1 Board L1 Line Power From P Compressor 1 Relay 115 VAC To T11 amp T13 On P C Board Replace P C Board Check Wiring To O D Blower Check Capacitor Check Motor For Ground Or Open Rewire To Motor Or Replace Components As Necessary 29 Outdoor Blower System 2 Red L E D 3 High Speed See Figure 13 Line Volts 115 VAC To Terminal T8 amp T9 On P C Board L1 Line Power From Compressor 2 Relay Replace P C Board 115 VAC To T12 amp T13 On P C Board Check Wiring To O D Blower Check Capacitor Check Motor pies PEN For Open Or Ground 30 1976 188 1 99 e RV Products A Division of AIRXCEL Inc RV Products A Division of Airxcel Inc P O Box 4020 Wichita KS 67204
22. nstate power to all systems thermostat cooling and heating OFF Starting with the system switch in the OFF position the display will be blank and no part of either the cooling or heating systems will be operating FAN Move the system switch to FAN The display indicates room temperature The cooling system fan operates continuously at high speed No other components or systems are operating HEATING Move the system switch to HEAT The display will indicate room temperature Adjust the setpoint of the thermostat above the room temperature displayed After 15 to 30 seconds the heat circuit of the thermostat will activate the heating controls Once the heat has turned on and is running adjust the setpoint below the room temperature displayed After 15 to 30 seconds the heat circuit of the thermostat will turn off and deactivate the heating controls COOLING Move the system switch to COOL The display will indicate room temperature Adjust the setpoint above room temperature Move the fan switch to LOW ON The fan operates continuously at low speed Move the fan switch to HIGH ON The fan operates continuously at high speed Move the fan switch to LOW AUTO the fan will stop Move the fan switch to HIGH AUTO the fan will remain off Adjust the setpoint 5 below room temperature if the thermostat has been powered for more than 3 minutes 1 stage cooling and the cooling fan will come on approximately 1 minute later I
23. or No Outdoor Fan Compressor Runs Outdoor Fan Runs No Indoor Fan Compressor Runs Indoor Fan Runs No Outdoor Fan Compressor Runs Indoor and Outdoor Fans Run Insufficient Cooling 22 Possible Solutions No A C Voltage Thermostat Wiring P C Board Insufficient Voltage to Unit Wiring P C Board Start Device Run Capacitors Open Overload Compressor Refer to Compressor Flow Chart Wiring Thermostat Freeze Thermister Insufficient Air Flow Compressor Contactor P C Board Refer to No Green L E D Flow Chart Wiring P C Board Fan Motor Fan Capacitor Refer to O D Blower Flow Chart Wiring P C Board Fan Motor Fan Capacitor Refer to I D Blower Flow Chart Air Flow Restrictions Too Much Heat Gain Refrigerant Systems Little or no Refrigerant Charge If You Have Not Been Trained in Refrigerant Sealed System Repairs Do Not Attempt To Break Into Systems 18 ELECTRICAL FLOW CHARTS 6795B SERIES With the use of these flow charts you will be able to quickly To use these flow charts start at the top left corner Using a identify a non working problem Determine if the problem is volt ohm meter check what is indicated in that box If the high or low voltage and then solve the problem answer to what is indicated is No work horizontally until you find the problem When the answer is Yes or OK work IMPORTANT NOTICE the chart downward until you locate the problem Do Not Move Downward on any chart until
24. proximately 2 minutes FAN When in the FAN position the cooling blower will operate continuously at high speed 2 Cooling Fan Switch The fan switch has four positions from which to control the operation of the cooling blower The fan switch controls operation of the cooling blower only after the system switch is placed into the COOL position With the system switch in any other position the fan switch will have no effect on the operation of the cooling blower Fan switch positions and their resulting function are listed below HIGH AUTO When in the HIGH AUTOMATIC position the cooling blower operates at high speed and cycles off and on with the 1 stage compressor 2 stage cooling will cycle on and off as needed having no effect on cooling blower operation LOW AUTO When in the LOW AUTOMATIC position the cooling blower operates at low speed and cycles off and on with the 1 stage compressor 2 stage cooling will cycle on and off as needed having no effect on cooling blower operation LOW ON When in the LOW ON position the cooling blower operates continuously at low speed Stage 1 and Stage 2 compressors cycle on and off as needed HIGH ON When in the HIGH ON position the cooling blower operates continuously at high speed Stage 1 and Stage 2 compressors cycle on and off as needed B TESTING Place the thermostat system switch into the OFF position Once all safety precautions have been met rei
25. r Open Or Ground 27 FY F Circuit Continuity NO K Restore 12 VDC 115 VAC To System 1 NO Restore 115 VAC NO Freeze Sensor Closed Tf Open Refer To Freeze Sensor Checkout K Check Pin Terminals And Connections From Thermostat To P C Board Check 12 VDC To R amp B At P C Board See Figure 14 K Everything Above Checks Out Replace P C Board COMPRESSOR 2 CHECKOUT THERMOSTAT CALLING STAGE 2 Note All Operating Functions Subject To Thermostat Time Delays Check 115 VAC To System 2 To Compressor 2 Relay And Common 2 K K K 12 VDC To Pin Connectors Y2 amp B On P C Board Also System 1 Compressor Operating 12 VDC To Y2 amp B At Thermostat T10 amp T3B See Figure 14 Check Compressor 2 Relay Operation K Check Compressor Start Device Check For Proper Wiring To Compressor 2 Check Compressor Run Capacitor Check Compressor Motor Windings For Open Or Ground NO NO NO NO NO NO 28 Restore 115 VAC See Compressor 1 Checkout Replace Thermostat If System 2 Should Be Calling And Is Not According To Operation Manual Check Pin Terminals And Connections From Thermostat Replace Lifeline If Necessary Replace Relay If 12 VDC Is Present And Relay Won t C
26. rvice 9 INDOOR BLOWER MOTOR REMOVAL Remove indoor blower access panel 4 Remove motor assembly from scroll 1 Disconnect wiring from motor terminal block and 5 Remove blower wheel and motor mounting bracket capacitor Note Upon reassembly the references made on 2 Remove 4 screws from venturi See 1 Figure 7 Figures 7 and 8 shall be used for proper reassembly 3 Remove 3 screws from motor mount bracket See 2 Figure 7 SIDE VIEW Section 2 Section 5 Su IL ou Q UNS Sg Qe Q OS 5 1 4 2 e Section 1 Section 4 Section 6 Section 3 FIGURE 7 Section 1 Position motor with terminal block parallel to motor mount leg opposite motor clamp Assemble motor mount into scroll in orientation shown Section 2 Torque nut to 65 in Ibs min Section 3 Ground wire terminal assemblies between screw head and washer Section 4 Motor rotation wires to be connected Yellow to Yellow and Orange to Orange 6795X822 Yellow to Orange and Yellow to Orange 6795X832 Section 5 Alternate capacitor 1499 546 Section 6 Bundle the rotation and capacitor wires up and wire tie together 13 TOP VIEW Wheel must be mounted with a minimum of 5 16 clearance to scroll sides Apply grease to motor shaft before assembling wheel Torque set screw on flat of shaft to 110 10 in Ibs
27. t in either COOL SET or HEAT SET the thermostat will automatically return the display to ACTUAL in approximately three minutes A description of the three modes follows ACTUAL When in ACTUAL mode the display is indicating current room temperature COOL SET When in COOL SET mode the display is indicating the current cooling system setpoint temperature At this time the cooling system setpoint temperature may be adjusted up or down to meet individual comfort needs See Adjusting Setpoint for further instructions HEAT SET When in the HEAT SET mode the display is indicating the current heating system setpoint temperature At this time the heating system setpoint temperature may be adjusted up or down to meet individual comfort needs See Adjusting Setpoint for further instructions All three display modes can be accessed without affecting the operation of the system System operation will remain normal unless a change in a setpoint temperature forces a change in system operation System Switch The system switch has four positions to control the operation of the heating and air conditioning systems They are as follows COOL When in the COOL position 1 2 stage cooling will cycle from the cooling system setpoint Blower operation will be controlled by the position of the Cooling Fan switch HEAT When in the HEAT position the heating system will cycle from the heating system setpoint The heating
28. ure Above 60 F OZ If Green L E D Will Still Not Remain On After Coil Temperature Is OK Check Thermister For Continuity Caution It May Have A Very High Resistance Replace Thermister If Open Check for 12 VDC To YES R amp B At The Thermostat Restore 12 VDC To Thermostat 24 Check All Pin Connectors at Thermostat Lifeline and P C board Replace Defective Parts As Necessary LD BLOWER LOW SPEED THERMOSTAT ON LOW FAN Note AIl operating functions subject to thermostat time delays 115 VAC To System 1 T1 amp T5 On P C Board Restore Power Check 12 VDC to R amp B At Thermostat Restore 12 VDC RG BO 12 VDC To GL amp B At Thermostat Replace Thermostat 12 VDC To Pin Connector GL amp B On P C Board See Figure 14 Check All Pin Connectors And Connections From Thermostat Replace Lifeline If Necessary 115 VAC To N O Contact Relay 3 And T5 On P C Board t Replace P C Board See Figure 13 Check Wiring To Motor Check Reconnect Wires or Replace Capacitor And Motor Windings Capacitor or Motor For Open Or Ground As Necessary 25 LD BLOWER HIGH SPEED THERMOSTAT ON HIGH FAN Note operating functions subject to thermostat time delays NO 115 VAC To System 1 Restore Power TI amp T5 On P C Board BOW 12 VDC To GH amp B NO Check 12 VDC To NO Restore 12 VDC At Thermostat R amp B At Thermostat RBC O O K K
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