Trane Unit Ventilator Energy Recovery System Installation and Maintenance Manual
Contents
1. TRANE Installation Library Product Section Product Model Literature Type Sequence Date File No Supersedes VERTICAL FLOOR ENERGY RECOVERY SYSTEM ZU Model ERS Direct Drive Size 050 ERS IOM 1 Service Literature Air Terminal Devices amp Heating Products Unit Ventilators ERS Installation Operation Maintenance 1 APRIL 1997 SV TD UV ERS IOM 1B 0497 SV TD UV ERS IOM 1 A 0895 Table of Contents SECTION 1 RECEIVING AND HANDLING Model Number Description s ic q uu rar EE I greed i ee eee 4 RECEIVING and Handling serberne a ae Ce a pakaq btc qp MERC KU rd 5 SECTION 2 GENERAL INFORMATION VAL DIMENSION SER atu 7 SECTION 3 INSTALLATION AVIOUINLING ee aie enm de Pa DR eee ek EE aa Y d da dcus 9 LnitVVallDOX Lurer oe CB auo dede E ee 10 Wallbox MOUNINO acie x eee ded anu had ME 11 Unit VentERS Mounting Lasse eee 12 End cover Installation se pedcs d eoe ut cR HE Ada 13 SECTION 4 ELECTRICAL INFORMATION Wiring Diagram 3 Speed MOTO Fuiste we ted cera ba dd ica 15 Electrical 2222508 utar ace che Moin o eub Qa a S a A QA 18 SECTION 5 START UP BONO Zu aste xvi dep pe E SR E tue ge Nee Aen e 20 Electric Defrost Fart Air Balancing ae a gin Ardet qa A pee edd ctt bb d packs eae 21 SE2. Unit Electrical Data Without Electric Defrost Supply Volts Minimum Circuit Amps Fuse Size Amps Electrical Data Electric Defrost Minimum Circuit Amps 63 16 88 Fuse Size Amps Electrical Data Electric Defrost Option Element KW Minimum Circuit Amps Lnd MN me o m p CIME NNI NEN an TABLE 1 ELECTRICAL DATA 18 SECTION 5 START UP Start Up and Operation of the Energy Recovery System General Inspect the fit up of the energy recovery unit to make sure it is attached snugly to the wall so that the seal gasket on the back of the unit is compressed Inspect the connection of the recovery unit to the unit ventilator to make sure that the two units are aligned and gasketing is compressed Improper fit up or seal will result in a loss of ventilation capacity Check unit wiring to make sure it is correct per the diagram Field Installed Controls The power relay in the energy recovery unit control box energizes the fresh air fan the exhaust fan and the energy recovery wheel motors Field supplied controls should energize the 24 volt coil on the relay to bring energy recovery unit on at the same time or after the unit ventilator fan is started during occupied periods If an outdoor air damper has been provided the outdoor air damper will open when the power relay is energized It takes approximately 180 seconds for the damper to reach full open ICS Controls The energ
3. Remove the front access panel Using an Allen wrench included with the unit turn the panel camlocks counter clockwise 3 Rotate the fans manually Wheels should move freely and be in proper alignment Visually inspect the fan area for obstructions or shipping damage 4 Move all dampers in the unit to be sure they modulate freely 5 Remove all applicable electrical connection knockouts See Figure 2 page 7 for their location SECTION 2 GENERAL INFORMATION GENERAL INFORMATION 4 375 X 875 SLOTS FOR WALL BACK VIEW NOTE OVERALL DIMENSION DOES NOT INCLUDE END COVERS OR CONNECTING PANEL LITT REAR ALTER ACCESS DOOR 21 25 END COVERS ARE OPTIONAL TOP VIEW 2 MOTORS FOR END COVER OR Mini TE CAN ERI CONNECTING PANEL 2 BLOWERS FALSE FRONT SIDE VIEW FRONT VIEW FIGURE 2 UNIT DIMENSIONS SECTION 3 INSTALLATION ENERGY RECOVERY SYSTEM 0 21 25 L UNIT VENTILATOR ENERGY RECOVERY 4 69 105 OPTIONAL hmi OPTIONAL END COVER PANEL END COVER ROOM AIR PIPE CHASE DISCHARGE AIR FRESH AIR U RETURN AIR ROOM AIR FIGURE 3 TANDEM UNIT INSTALLATION LEFT HAND UNIT DEPICTED UNIT MOUNTING Wall boxes are to be installed prior to mounting the Energy Recovery System unit Refer to the installation instructions provided with the wall boxes TUV IN 3 NOTE For mounting with Unit Ventilator please refer to page 12 Figure 6 amp 7
4. 32 35 5 5 2 3 _ 212 _ PI 32 q 42 15 1 SP2 1 213 Biel NOTE TB1 3 IS USED FOR ELECTRIC BLOWER MOTOR TA RELE CANAMETEREQUE WA RNING NECT ELECTRIC POWER E FAN SPEED SWITCH _ OUE TO ELECTRICAL SHOCK RAPERO TSIDE AIR DAMP RC RUN CAPACITOR m EAN Er ASPAS A CAUTION COPPER CONDUCTORS ONLY B1 182 18 F1 MI IM2 39 Si S2 RC TO ACCEPT ANY OTHER WIRING FIGURE 10 WIRING DIAGRAM FOR 3 SPEED MOTOR 16 WIRING ELECTRIC DEFROST SUPPLY POWER Power supply wiring is to be connected to Terminals 1 and 4 at the junction box in the left hand pocket ELECTRICAL WARNING DISCONNECT ALL ELECTRICAL POWER SWITCHES AND SECURE IN THAT POSITION BEFORE SERVICING THE UNIT FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH FROM ELECTRICAL SHOCK SUPPLY POWER Power supply wiring is to be connected to the following line terminals 1 1 Phase 2 Wire L1 L2 from TB1 Unit Vent NOTE The supply neutral wire must be connected to the neutral terminal blocks INSET A 120V CONTACTOR rz SERT TESWT EWITRH DES 0 OUTSIDE AIR THERMOSTAT kr css RS TERMINAL BLOCK Ax WARNING PPY Va ELECTRIC POWER SUPPLY BEFORE SERVICING TO PREVENT INJURY OR DEATH DUE TO ELECTRICAL SHOCK LIBI TB2 sg L 1 A CAUTION USE COPPER CONOUCTORS ONLY FIGURE 11 WIRING DIAGRAM TERMINALS ARE NOT DESIGNE 17
5. to outdoor air temperature The purpose of the defroster is to just get the incoming air temperature above the threshold Inside the energy recovery unit is a defrost thermostat The thermostats setting should be determined from the graph in Figure 12 page 22 Care should be taken in this temperature selection and setting Setting the setpoint higher than necessary wastes energy Typical defrost thermostat settings are between 20 F to 30 F Fan Air Balancing The air balancing of the fans is necessary to maintain proper room pressurization and to assure proper ventilation rate The performance of the fans will be determined by the external static pressures present in the installation Each fan has a three speed motor switch to allow for capacity modulation To balance the system you may follow these steps 1 Table 2 page 22 is a chart of air flow rates at the different fan speeds for the energy recovery unit These flow rates are to be used as a reference to speed start up From Table 2 page 22 select the fan speeds that are equal to or greater than the design ventilation rate 2 With the unit ventilator and the energy recovery unit operating measure the intake air at the outside air wallbox with a flow hood 3 Measure the exhaust air being discharged with a flow hood 4 If the air flow is too low and the energy recovery unit is not set to high speed set it to a higher speed and repeat steps 2 and 3 If the system has been equipped w
6. 6 J2 4 P2 4 211 P1 4 2 3 P2 3 212 P1 3 J2 1 12 P2 1 213 P1 1 lt NOTE 1 3 IS USED FOR ELECTRIC HEAT amp FAN INTERLOCK WARNING DISCONNECT ELECTRIC POWER E ATH R OUE TO ELECTRICAL SHOCK CAUTION COPPER CONDUCTORS ONLY TO ACCEPT ANY OTHER WIRING FIGURE 9 WIRING DIAGRAM FOR 3 SPEED MOTOR 15 WIRING 208 240 277V 1 PHASE SUPPLY POWER Power supply wiring is to be connected to Terminals 1 and 2 at the junction box in the left hand end pocket ELECTRICAL WARNING DISCONNECT ALL ELECTRICAL POWER SWITCHES AND SECURE IN THAT POSITION BEFORE SERVICING THE UNIT FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH FROM ELECTRICAL SHOCK SUPPLY POWER Power supply wiring is to be connected to the following line terminals 1 1 Phase 2 Wire L1 L2 from TB1 Unit Vent NOTE The supply neutral wire must be connected to the neutral terminal block 208 230 WHT J7 1 100 _ J8 P8 1 200 J9 1 277 RED DET 101 J38 2 25 P8 2 201 Jj9 4 WIRE HARNESS 2 BLK 3 J7 3 102 J8 3 35 P8 3 202 9 5 gt 24V i lu 204 9 3 I l 205 J9 2 I E 2 E GRN 104 104 03 45 y P3 4 204 E Avia 105 105 43235 3 P3 3 205 WE 117 43 2 9 P3 2 27 Pht l i 53 15 5 P3 1 Pant MOTOR 1 M2 GRN O O 115 P5 3 3 BLK ERS 114 PS 1 4 REDI M1 GRN T 106 P6 6 107 P6 4 108 P6 3 109 P6 1 J2 6 P2 6 210 P1 6 6 gt nn 6 92 45 45 P2 4 211 _ PIS
7. CTION 6 TROUBLESHOOTING Foer New Xon coe catis AS eee D peke 24 SECTION 7 MAINTENANCE Energy Recovery Wheel Removal and Installation 26 Filter TT a Ge IPRC 27 American Standard 1997 2 SECTION 1 RECEIVING AND HANDLING MODEL NUMBER DESCRIPTION Trane products are identified by a multiple character model number that precisely identifies a particular type of unit An explanation of the multiple character number is shown below It will enable the owner or Service Engineer to define operation components and accessories UNIT MODEL IDENTIFIER WALL BOX AND WALL BOX FINISH 00 NO WALL BOX ERS ENERGY RECOVERY SYSTEM CA CLEAR ANODIZED FINISH LB LIGHT BRONZE FINISH MB MEDIUM BRONZE FINISH DEVELOPMENT SEQUENCE DB DARK BRONZE FINISH B1 BRICK BR 1 FINISH FIRST DEVELOPMENT B3 BRICK BR FINISH B5 BRICK BR 5 FINISH WH WHITE FINISH BL BLACK FINISH SS SPECIAL SIZE FINISH UNIT SIZE 050 500 CFM SSS SPECIAL SIZE SUBBASES 0 NO UNIT SUBBASE OPERATING POWER SUPPLY 1 2 SUBBASE 1 120V 1 PHASE un 2 208V 1 PHASE S SPECIAL SUBBASE 3 240V 1 PHASE 4 277V 1 PHASE END COVERS ETL LISTING 0 NO END COVERS A 2 21 1 4 DEEP W STD CUTOUT 0 NO ETL LISTING B 21 1 4 DEEP W STD CUTOUT 1 ETL LISTING C 2 21 1 4 DEEP W EXTENDED CUTOUT S SPECIAL END COVERS DESIGN SEQUENCE UNIT COLOR SELECTION DESIGN SEQ
8. Figure 2 page 7 illustrates the 375 x 875 slots in the back of the unit Two mounting slots are provided at each end of the unit All mounting fasteners are to be furnished by the installer 1 Set the Unit Vent in place and pull tightly against the wall to compress the gasket on the back edge of the unit Anchor the unit to the wall using the mounting holes in both end pockets 2 When tightening the mounting fasteners keep the unit level and resting evenly on the floor NOTE Unit must be level 3 Before starting the unit refer to START UP in SECTION 5 TOP EDGE OF WALLBOX NO HIGHER THAN 17 FROM FLOOR LEVEL WALLBOX MUST LINE UP SUPPLY AIR W EDGE OF UNIT TO UNIT VENTILATOR EXHAUST SIDE SUPPLY AIR SIDE WALL SECTION BLOCKOFF BLOCKOFF MUST BE SUPPLIED BY FIELD IF WALLBOX IS PURCHASED FROM ANOTHER SOURCE EXHAUST SPLITTER FIELD SUPPLIED BACKDRAFT DAMPER ENERGY RECOVERY UNIT FIGURE 4 UNIT WALLBOX UNIT AND WALLBOX MOUNTING 14 00 WALLBOX 2 PIPE WALLBOX AT 14 ABOVE FLOOR LEVEL MAX 2 PIPE 6 SUBBASE ELEVATION FIGURE 5 WALLBOX INSTALLATION ALL POSSIBLE INSTALLATIONS NOT SHOWN INSTALLATION NOTES 1 SPLITTER IS TO BE FIELD SUPPLIED AND COMPLETELY BLOCK EXHAUST AIR FROM FRESH AIR TO PREVENT CROSS CONTAMINATION WALL BOXES ARE NOT SLEEVED WALL BOX OPENING MUST BE DUCTED OR FINISHED OUT BY FIELD INSTALLERS WALLBOX END SHOULD LINE UP WITH ERS EXHAUST END AND BOTTOM OF WALL BOX S
9. HOULD BE BETWEEN FLOOR LEVEL AND 3 INCHES MAXIMUM ABOVE FLOOR LEVEL FOR 4 PIPE ENERGY RECOVERY SYSTEM 2 PIPE ENERGY RECOVERY SYSTEM WITH OR WITHOUT SUBBASE MUST HAVE A CUT OUT IN FRONT OF BACKDRAFT DAMPER IN ORDER FOR BLADES AND AIR FLOW TO MOVE FREELY UNIT MOUNTING WITH UNIT VENTILATOR To fasten the Energy Recovery Unit to the Unit Ventilator use 1 4 20 x 2 000 bolts and 1 4 x 20 spin nuts Figure 7 from the plastic hardware bag provided with shelf unit Put fasteners only in the two front holes Do not tighten After all units are fastened together in this manner recheck for proper alignment and leveling When properly aligned and level tighten all fasteners Attach end opposite from Unit Ventilator to the wall UNIT VENTILATOR CONNECTING PANEL ENERGY RECOVERY UNIT TWO FRONT HOLES FIGURE 6 UNIT VENTILATOR ENERGY RECOVERY SYSTEM ALIGNMENT ENERGY RECOVERY SYSTEM END COVER UNIT VENTILATOR END COVER CONNECTING PANEL HEX SCREW Take Fasteners Take Fasteners from Bag with from Bag with End Cover ERS Unit FIGURE 7 FASTENING THE SECTIONS 12 END COVERS End covers must be installed on the Energy Recovery System unit after all piping wiring and accessory installation is complete With the unit front access panel removed set the end covers against the ends of the unit and attach with 1 4 20 x 88 machine screws shipped with the end covers Cage nuts are provided on the inside of t
10. UENCE AO 1 DELUXE BEIGE CABINET 2 CAMEO WHITE CABINET 3 SOFT DOVE CABINET ELECTRIC DEFROST 4 STONE GREY CABINET E T Roce MAUVE CANET T R NT Hs N vm Pee MARKETING 7 BRONZE TONE CABINET 3 2 00 KW 208V 1 PHASE S SPECIAL COLOR CABINET 4 2 44 KW 208V 1 PHASE PA D DU RE SUPPLY AIR FILTER SIZE 7 3 25 KW 240V 1 PHASE a 148 KW 240071 PHASE 1 1 FESS Meda A 3 25 KW 277V 1 PHASE S SPECIAL S SPECIAL FILTER SUPPLY AIR INLET TO UV CONTROLS A LEFT HAND INLET TO UV 4 PIPE CHASE 1 FIELD SUPPLIED STANDARD 2 FIELD SUPPLIED W ECONOMIZER B RIGHT HAND INLET TO UV 4 PIPE CHASE 3 TUC CONTROLS C LEFT HAND INLET TO UV 2 PIPE CHASE 4 TUC CONTROLS W ECONOMIZER D RIGHT HAND INLET TO UV 2 PIPE CHASE S SPECIAL CONTROLS S SPECIAL SUPPLY AIR INLET TO UV DAMPER CONFIGURATION 0 DAMPERS 1 BACKDRAFT DAMPER ON EXHAUST 2 SHUT OFF DAMPER ON SUPPLY 3 BACKDRAFT DAMPER ON EXHAUST amp SHUT OFF DAMPER ON SUPPLY S SPECIAL DAMPERS RECEIVING AND HANDLING Energy Recovery System ERS units are packaged in a protective top panel rugged corner posts and stretch wrapped for shipping as illustrated in Figure 1 CARTON FIGURE 1 Shipping Carton Inspect the unit carefully for shipping damage Claims must be made with the delivery carrier Before installing the unit complete the following checks and procedures 1 Remove shipping brackets from skid 2
11. against the face of the wheel Rotate wheel to confirm free movement Retighten screws Apply power and confirm rotation ERS CASSETTE ERS WHEEL BELTS CENTER SUPPORT SCREW FIGURE 13 ENERGY RECOVERY WHEEL MAINTENANCE 26 FILTERS Each unit is equipped with 2 filters The outside air filter is a 1 inch thick throwaway filter which can be easily removed from the top of the unit The energy recovery unit also has a 1 inch thick throwaway filter located in the door panel Filter sizes 14x 20x 1 only Front panel exhaust 14 x 25 x 1 Rear supply 27 The Trane Company Water Source Heat Pump Systems P O Box 7916 ERS IOM 1 Waco TX 76714 7916 Since The Trane Company has a policy of continuous April 1997 product improvement it reserves the right to change Supersedes ERS IOM 1 An American Standard Company design and specification without notice August 1995 28
12. en the bolt in the center of the wheel Remove the bolt and cover plate Remove the belts on front of the wheel Grasp the wheel at locations diametrically opposite each other Pull wheel straight off the shaft Wheel may be cleaned with water only The wheel is immersible B INSTALLATION 1 2 Install 6 32 slotted screw into end of wheel shaft DO NOT INSTALL PLATE AT THIS TIME Install wheel in the same fashion that it was removed The pin in the hub sleeve must line up with the flat on the shaft Using a flat bladed screwdriver in the 6 32 screw in the shaft end The shaft can be rotated until the matching of the pin and flat is insured The wheel will then slip into final position Remove 6 32 screw from end of shaft Slip screw through hole in cover plate and install assembly to shaft Reinstall the two wheel belts Turn the wheel by hand to confirm that the belts are tracking parallel to each other and no binding can be felt C AIR SEAL ADJUSTMENT Pile type air seals are located in the front and rear of the energy wheel Air seals are factory adjusted for close clearance to prevent cross contamination of air flows Removal of the wheel for maintenance will require readjustment as follows 1 2 3 Loosen the four screws on the adjustment angle located on the front center support Adjust air seal to wheel and slightly tighten screws Check seal clearance by placing two pieces of paper typically 004 thick
13. he end cover flanges NOTE Align top and back edges of the covers and unit before tightening screws CAUTION DO NOT RUN UNITS FOR ANY LENGTH OF TIME WITHOUT ALL PANELS PROPERLY INSTALLED FAILURE TO DO SO WILL RESULT IN EVENTUAL EQUIPMENT FAILURE NOTE ALIGN TOP OF END COVER 1 8 ABOVE UNIT TOP AND ALIGN BACK EDGE OF END COVER WITH BACK OF UNIT SLOT IN END OF UNIT END COVER FIGURE 8 END COVER INSTALLATION SECTION 4 ELECTRICAL INFORMATION WIRING 120V 1 PHASE SUPPLY POWER Power supply wiring is to be connected to Terminals 1 and 2 at the junction box in the left hand end pocket ELECTRICAL WARNING DISCONNECT ALL ELECTRICAL POWER SWITCHES AND SECURE IN THAT POSITION BEFORE SERVICING THE UNIt FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH FROM ELECTRICAL SHOCK SUPPLY POWER Power supply wiring is to be connected to the following line terminals 1 1 Phase 2 Wire L1 L2 from TB1 Unit Vent NOTE The supply neutral wire must be connected to the neutral terminal block 120V WHT 4 7 1 100 J8 1 15 P8 1 200 J9 1 gt RED J7 2 101 J8 2 P8 2 201 J9 4 WIRE HARNESS 2 2 DAMPER BLK 3 27 3 102 483 35 P8 3 202 J9 5 2 L2 L1 204 J9 3 4 4v i I I 205 J9 2 I GRN 104 104 J3 4 4 P3 4 204 1 I 117 J3 2 2 P3 2 217 4 1 BLK RX BA DP T r ERS l 116 J3 1 1 P3 1 216 P4 1 1 RED MOTOR i gt lt M2 z MEI nS 5 3 T 106 107 108 109 2 63 q P2 6 210 PIB
14. ith the TUC and the damper option fine adjustment of the ventilation air can be made with the minimum outside air damper position For example if on start up the outside air fan is blowing 490 CFM and only 450 is required the outside air damper could be used to restrict the air flow down to 450 Using the service tool or TRACER the minimum outside air damper position can be adjusted down until the correct air flow is achieved 21 INDOOR RELATIVE FROST THRESHOLD inn ING ES ee BER IRE mer pe SE FO jp O Eq gll pq pp OUTDOOR TEMPERATURE degrees F 75 85 RH FIGURE 12 FROST THRESHOLD Fan Speed Low Med High CFM 350 390 490 TABLE 2 TYPICAL AIR FLOWS Typical air flows for the energy recovery unit in a typical installation with the wallbox and 1 inch filters REFERENCE ONLY STATIC PRESSURES WILL VARY 22 SECTION 6 TROUBLESHOOTING Troubleshooting Symptom Possible Problem ERS fans will not run Supply Voltage too low min 90 nominal Crossover wire plug between unit vent and ERS misconnected Fuse in the ERS unit control box blown TUC not allowing exhaust fan operation i e not configured or not allowed because of deviation from setpoint too great Energy recovery wheel not turning Seal brushes too tight restricting wheel motion Wheel drive belt is off Economizer relay erroneously energized Ventilation capacity not to rating Wall box misalig
15. ned Wall box restricting air flow ERS improperly sealed to wall ERS unit not properly sealed to unit ventilator Splitter missing or improperly installed Damper not opening check crossover wire plug connection Damper wiring reversed Filter blocked Exhaust capacity not to rating Wall box misaligned Wall box restricting air flow ERS improperly sealed to wall Splitter missing or improperly installed Damper not opening cut out in wall not allowing damper to open Filter blocked Electric Defrost not operating Front Panel must be in place Fan interlock switch not making Outdoor air temp too high Humidity problems Assure that Energy Recovery unit is off during unoccupied periods Assure that Energy Recovery is off during morning warm up cool down to within 3 F of setpoint Refers to optional equipment that may not be on all units 24 SECTION 7 MAINTENANCE MAINTENANCE MOTOR BEARINGS Trane uses permanently lubricated sleeve type bearings DO NOT OIL MOTOR IT CAN CAUSE PREMATURE FAILURE ENERGY RECOVERY WHEEL REMOVAL AND INSTALLATION The wheel is removable for cleaning and should be cleaned every 6 months Tools required flat blade screwdriver suitable for 6 32 screw A REMOVAL N 01 O Remove the front panel with the allen key provided with the unit Remove the center support by loosening the fasteners located at the top and bottom of the unit See Figure 13 on this page Loos
16. ovided a economizer control relay will be found in the energy recovery control box This relay breaks the flow of electricity to the heat wheel motors On a call for cooling a 24 VAC signal should be supplied to the relay coil to disable energy recovery If this TUC option has been selected the signal will come from the TUC Rev 14 0 or later in the unit ventilator The energy recovery fans will continue to run in the economizer mode only the wheel motors will be stopped With the field supplied controls option an outdoor air thermostat will be supplied The thermostat is located inside the energy recovery unit and is used to set the economizing outdoor air temperature below which economizing will be allowed With the TUC option this setting will be factory configured and will be field adjustable with the service tool or TRACER Electric Defrost Control Frost may form on the surface of the energy recovery wheel during times of very low outside air temperatures Frost will interrupt the air flow reducing or stopping ventilation The electric defrost option is available to prevent frost from coating the wheel The electric defroster is located in front of the fresh air section of the energy recovery wheel When the defroster is energized it raises the air temperature before it enters the wheel Refer to Figure 12 page 22 to determine the frost threshold for applicable conditions Frost threshold is determined by the relationship of indoor relative humidity
17. y recovery system has been design specifically to work with Terminal Unit Controller TUC When the TUC option is ordered on the unit ventilator and the energy recovery unit connection is made easy by the factory supplied connection J9 plug on wire diagrams and factory supplied crossover wires The TUC mounted in the unit ventilator will be factory configured for the appropriate control sequence if it was ordered with the energy recovery unit option If the energy recovery unit is being installed as a retrofit the TUC will have to be reconfigured The general configuration of the TUC is as follows The exhaust fan output is enabled and used as the input for the power relay on the energy recovery unit 9 Exhaust fan on point should be set to 10 percent The Outdoor Air OA damper stroke time is set to 180 seconds and is used to operate the OA damper in the Energy recovery unit when present Minimum OA damper position should be set to 100 percent The operating sequence for the unit when configured as above should follow these steps 1 On power up the TUC goes through an auto calibration 2 The unit ventilator fan comes on 3 The OA damper starts to open if present 4 The energy recovery unit fans come on 5 When the unit ventilator goes unoccupied or the system switch on the zone sensor is switched off the energy recovery fans go off and the damper closes if present 20 Economizer Control If this option has been pr
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