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Carrier 50HCQ12, Installation Instructions Manual

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Carrier 50HCQ12 Installation Instructions Manual Download Page 45

45

Fig. 56 — 

Belt Drive Motor Mounting

Pre-Start and Start-Up

This completes the mechanical installation of the unit. Refer to the

unit’s Service Manual for detailed Pre-Start and Start-Up instruc

-

tions.  Download  the  latest  versions  from  HVAC  Partners

(www.hvacpartners.com).

BLOWER PULLEY

V-BELT

MOTOR 
PULLEY

MOTOR

MOTOR MOUNTING

PLATE 

MOUNTING

BOLTS (4) 

Summary of Contents for 50HCQ12

Page 1: ...N CONTROLLER FACTORY OPTION CONTROLLER OPTIONS Step 11 Adjust Factory Installed Options 43 SMOKE DETECTORS ECONOMI ER IV OCCUPANCY SWITCH Step 12 Install Accessories 43 Step 13 Check Belt Tension 44 BELT FORCE DEFLECTION METHOD BELT TENSION METHOD Pre Start and Start Up 45 START UP CHECKLIST FOR 50HCQ12 SINGLE PACKAGE ROOFTOP HEAT PUMP REMOVE AND USE FOR JOB FILE 47 START UP CHECKLIST CL 1 SAFETY ...

Page 2: ...PERATION AND SAFETY HAZARD Failure to follow this warning could cause personal injury death and or equipment damage R 410A refrigerant systems operate at higher pressures than standard R 22 systems Do not use R 22 service equipment or components on R 410Arefrigerant equipment WARNING PERSONAL INJURYAND ENVIRONMENTAL HAZARD Failure to follow this warning could cause personal injury or death Relieve...

Page 3: ...Revision Base Unit Controls 0 Electro mechanical Controls can be used with W7212 EconoMi er IV Non Fault Detection and Diagnostic 1 PremierLinkTM Controller 2 RTU Open Multi Protocol Controller 6 Electro mechanical with W7220 Economizer controller Controls Can be used with W7220 EconoMi er X with Fault Detection and Diagnostic Intake Exhaust Options A None B Temperature Economizer w Barometric Rel...

Page 4: ...4 Fig 2 Unit Dimensional Drawing Size 12 Units ...

Page 5: ...5 Fig 2 Unit Dimensional Drawing Size 12 Units cont ...

Page 6: ...DITION A 48 in 1219 mm 18 in 457 mm 18 in 457 mm 12 in 305 mm Unit disconnect is mounted on panel No disconnect convenience outlet option Recommended service clearance Minimum clearance B 42 in 1067 mm 36 in 914 mm Special Surface behind servicer is grounded e g metal masonry wall Surface behind servicer is electrically non conductive e g wood fiberglass Check sources of flue products within 10 ft...

Page 7: ...om O ring Install the fitting body and torque to 96 10 in lbs 10 9 1 Nm Do not exceed 106 in lbs 11 9 Nm when tightening INSTALLATION Jobsite Survey Complete the following checks before installation 1 Consult local building codes and the NEC National Elec trical Code ANSI NFPA 70 for special installation requirements 2 Determine unit location from project plans or select unit location 3 Check for ...

Page 8: ...ns 9 Install other accessories FRAME MOUNTED INSTALLATION Frame mounted applications generally follow the sequence for a curb installation Adapt the sequence as required to suit specific installation plan Step 3 Inspect Unit Inspect unit for transportation damage File any claim with trans portation agency Confirm before installation of unit that voltage amperage and cir cuit protection requirement...

Page 9: ...9 Fig 6 Roof Curb Details REV 50TM500827 ...

Page 10: ...red Rollers may be used to move unit across a roof When the unit is ready to be rigged and no longer will be lifted by a fork truck the wood protector under the basepan must be removed Remove 4 screws from each base rail Wood protector will drop to the ground See instructions on the unit base rails Level by using unit frame as a reference See Table 5 and Fig 8 for additional infor mation Lifting h...

Page 11: ...stall accesso ry CRDUCTCV001A00 to cover the vertical supply duct opening Use the return duct cover removed from the unit end panel to cov er the vertical return duct opening Use the screws to install the covers on vertical duct openings with the insulation side down The panels must be inserted into the notches on the basepan to properly seal The notches are covered by the tape used to secure the ...

Page 12: ... al support tray using plastic stretch wrap Located in the return air compartment the assembly s metal tray is attached to the basepan and also attached to the damper using two plastic tie wraps 1 To gain access to the hood remove the filter access panel See Fig 13 2 Locate the 2 screws holding the metal tray to the basepan and remove In order to remove the screws it may be nec essary to remove th...

Page 13: ...nomizer only 4 Insert the hood divider between the hood sides See Fig 17 and 18 Secure hood divider with 3 screws on each hood side The hood divider is also used as the bottom fil ter rack for the aluminum filter 5 Attach the post that separates the filters with the screws provided 6 Open the filter clips which are located underneath the hood top Insert the aluminum filter into the bottom filter r...

Page 14: ...power from the condenser end of the unit to either the factory option disconnect the bottom of the control box or the single point box accessory One inch conduit is provided be hind the access panel located under the control box For those units that require conduit larger than 1 inch it must be field sup plied Figures 21 23 show the various wire routings If the field disconnect is larger than 100A...

Page 15: ...om the 230 v connection and moving it to the 200 v 1 4 in male terminal on the primary side of the transformer Refer to unit label diagram for additional information Field power wires are connected to the unit at line side pressure lugs at the main terminal block TB1 or at factory installed option non fused disconnect switch See Fig 27 Max wire size is 2 AWG copper only See Fig 26 Fig 26 Power Wir...

Page 16: ...cause damage to electrical components Such operation would invalidate any applicable Carrier warranty NOTE Check all factory and field electrical connections for tight ness UNITS WITHOUT FACTORY INSTALLED NON FUSED DISCONNECT When installing units provide a disconnect switch per NEC Na tional Electrical Code of adequate size Disconnect sizing data is provided on the unit informative plate Locate o...

Page 17: ...et access is through the unit s control box access panel See Fig 30 The primary leads to the convenience outlet transformer are not factory connected Selection of primary power source is a custom er option If local codes permit the transformer primary leads can be connected at the line side terminals on the unit mounted non fused disconnect switch this will provide service power to the unit when t...

Page 18: ... exit the cover Check for full closing and latching Fig 32 Weatherproof Cover Installation FACTORY OPTION THRU BASE CONNECTIONS This service connection kit consists of a 1 2 in electrical bulkhead connector and a 1 1 2 in electrical bulkhead connector all factory installed to the basepan cover plate Remove the cover plate from the shipping bracket and attach to basepan with 8 screws provided The 1...

Page 19: ...uns up to 50 ft 15 m use no 18 AWG American Wire Gage insulated wire 35 C 95 F minimum For 50 to 75 ft 15 to 23 m use no 16 AWG insulated wire 35 C 95 F minimum For over 75 ft 23 m use no 14AWG insulated wire 35 C 95 F minimum Wire sizes larger than no 18 AWG can not be directly connected to the thermostat and will require a junc tion box and splice at the thermostat Fig 34 Typical Low Voltage Con...

Page 20: ...s indicating Stage 1 Cooling Stage 2 Cooling and Stage 1 Heating from the space thermostat or unit control system PremierLink controller or RTU Open control ler it generates commands to start compressors with or without reversing valve operation to produce Stage 1 Cooling one com pressor runs Stage 2 Cooling both compressors run or Stage 1 Heating both compressors run Auxiliary Electric Heat contr...

Page 21: ...B W1 W2 Heat 2 DI 24 vac P2 6 CTB W2 R Power 24 vac P3 1 CONTL BRD 8 C Common 24 vac P3 2 CONTL BRD 4 DFT 1 DI 24 vac DFT 1 to DFT 1 DFT 2 DI 24 vac DFT 2 to DFT 2 OUTPUTS IFO Fan On DO 24 vac P3 9 REHEAT HP 2 OF OD Fan On DO 24 vac OF OFR RVS1 DO 24 vac P3 7 to P3 5 Energize in COOL RVS2 DO 24 vac P3 6 to P3 4 Energize in COOL COMP 1 DO 24 vac P3 10 FPT1 REHEAT HP 6 COMP2 DO 24 vac P3 8 FPT2 REHE...

Page 22: ...box after re moving one of the two knockouts in the corner of the box Using a connector at the control box to protect the wire as it passes into the control box Pull the wires over to the terminal strip at the upper left corner of the Central Terminal Board CTB Use the connec tor at the control box and the wire tie to ensure that the thermostat wire is tight and will not be damaged by contact with...

Page 23: ...t Use the wiring pro cedure listed below for each heater as determined by the number of stages in the heater Single Stage Heaters Single stage heaters will have an orange and a brown control wire Connect these to the orange and brown wires located on TB4 Two Stage Heaters Two stage heaters will have orange purple red and brown wires The orange and the purple are the control wires and the red and b...

Page 24: ...sory Electric Heater Control Connections NOTE Optional Outdoor Temperature Control at One Heater Stage Move either heater wire to this terminal and connect outdoor temperature switch between second and third terminals ...

Page 25: ...25 Fig 42 Typical 50HCQ Control Wiring Diagram ...

Page 26: ...26 Fig 43 Typical 50HCQ Power Wiring Diagram 208 230 3 60 unit shown ...

Page 27: ...27 Fig 44 PremierLink Controller Wiring Schematic ...

Page 28: ...28 Fig 45 RTU Open Controller System Wiring Diagram ...

Page 29: ...vailable with bus sensors User Interface The interface provides status for normal operation setup parame ters checkout tests and alarm and error conditions with a 2 line 16 character LCD display and four button keypad Electrical Rated Voltage 20 to 30 Vac RMS 50 60 Hz Transformer 100 va maximum system input Nominal Power Consumption at 24 Vac 60 Hz 11 5 VA without sensors or actuators Relay Digita...

Page 30: ...NTC and COM Outdoor Air Temperature Sensor Polarity Insensitive Connection S BUS S BUS S BUS Sylk Bus Enthalpy Control Sensor Polarity Insensitive Connection Bottom Left Terminal Block IAQ 2 10 2 10 VDC Air Quality Sensor Input e g CO2 sensor IAQ COM COM Air Quality Sensor Common IAQ 24V 24 VAC Air Quality Sensor 24 VAC Source ACT 2 10 2 10 VDC Damper Actuator Output 2 10 VDC ACT COM COM Damper Ac...

Page 31: ...ig 49 CO2 Sensor Wiring Interface Overview This section describes how to use the EconoMi er X user inter face for Keypad and menu navigation Settings and parameter changes Menu structure and selection User Interface The user interface consists of a 2 line LCD display and a 4 button keypad on the front of the economizer controller Keypad Use the four navigation buttons see Fig 50 to scroll through ...

Page 32: ...LARMS NOTE Some parameters in the menus use the letters MA or MAT indicating a mixed air temperature sensor location before the cooling coil This unit application has the control sensor locat ed after the cooling coil in the fan section where it is designated as Cooling Supply Air Temperature or SAT sensor Setup and Configuration Before being placed into service the W7220 Economizer module must be...

Page 33: ...ected short or out of range DA TEMP _ _ _ F 0 to 140 F DISCHARGE AIR TEMPERATURE after Heating section Displays when Discharge Air sensor is connected and displays measured discharge temperature Displays _ _ _F if sensor sends invalid value if not connected short or out of range OA TEMP _ _ _ F 40 to 140 F OUTSIDE AIR TEMP Displays measured value of outdoor air temperature Displays _ _ _F if senso...

Page 34: ...Displays only if a CO2 sensor is connected Used for Vbz ventilation max cfm setpoint Displays 2 to 10 V if 3 sensors RA OA and MA In AUTO mode dampers controlled by CFM 100 to 9990 cfm increment by 10 If OA MA RA and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode the OA dampers are controlled by CFM and displays from 100 to 9990 CFM 2 to 10 Vdc With 2 speed fan units VENT L low s...

Page 35: ...ncremented by 10 SUPPLY AIR TEMPERATURE LOW LIMIT Temperature to achieve Freeze Protection close damper and alarm if temperature falls below setup value FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITION Damper position when freeze protection is active closed or MIN POS CO2 ZERO 0ppm 0 to 500 ppm Increment by 10 CO2 ppm level to match CO2 sensor start level CO2 SPAN 2000ppm 1000 to 3000 p...

Page 36: ...ected check wiring then replace sensor if the alarm continues CO2 SENS ERR N A N A CO2 SENSOR ERROR CO2 sensor has failed gone out of range or become disconnected check wiring then replace sensor if the alarm continues OA SYLK T ERR N A N A OUTSIDE AIR S BUS SENSOR ERROR Outdoor air enthalpy sensor has failed or become disconnected check wiring then replace sensor if the alarm continues OA SYLK H ...

Page 37: ...ir for the economizer cooling control sensor On these roof top units the economizer control sensor is located downstream of the evaporator indoor coil in the supply fan section where this sensor is designated as Supply Air Temperature SAT sensor 3 SETPOINTS DRYBLB SET This point is not displayed if a Return Air differential temperature sensor or an Outdoor Air enthal py sensor is connected 4 SYSTE...

Page 38: ...CUPIED UNOCCUPIED None No Off Off High 0 v Off 0 v Off MIN POS Closed On Off High 24 v On 0 v Off MIN POS Closed On On High 24 v On 24 v On MIN POS Closed Yes Off Off High 0 v Off 0 v Off MIN POS Closed On Off High 0 v Off 0 v Off MIN POS to Full Open Closed to Full Open On On High 24 v On 24 v Off MIN POS to Full Open Closed to Full Open DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O ...

Page 39: ...No Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 24 v On 0 v Off VENTMIN Closed On On High 24 v On 24 v On VENTMIN Closed Yes Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 0 v Off 0 v Off VENTMIN to Full Open Closed to Full Open On On High 24 v On 0 v Off VENTMIN to Full Open Closed to Full Open Above Set No Off Off High 0 v Off 0 v Off VENTMIN to VENTMAX Closed On Off High 24 ...

Page 40: ...nd Y2 I have not been satisfied DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O OCCUPIED UNOCCUPIED None No Off Off Low 0 v Off 0 v Off MIN POS L Closed On Off Low 24 v On 0 v Off MIN POS L Closed On On High 24 v On 24 v On MIN POS H Closed Yes Off Off Low 0 v Off 0 v Off MIN POS L Closed On Off Low 0 v Off 0 v Off MIN POS L to Full Open Closed to Full Open On On High DELAY 24 v On...

Page 41: ...status to know where to position the OA damper for minimum position for the fan speed The 2 speed fan delay is available when the system is pro grammed for 2 speed fan in the System Setup menu item The 2 speed fan delay is defaulted to 5 minutes and can be changed in theAdvanced Setup menu item When the unit has a call for Y1 In and in the free cooling mode and there is a call for Y2 In the 2 spee...

Page 42: ...Press the Menu Up Exit button to complete the action and return to the previous menu NOTE If the alarm still exists after clearing it it is redisplayed within 5 seconds SMOKE DETECTORS Smoke detectors are available as factory installed options on 50HCQ models Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer or in combination of Supply Air and Return...

Page 43: ...actory Installed Options SMOKE DETECTORS Smoke detector s will be connected at the Controls Connections Board at terminals marked Smoke Shutdown Cut jumper JMP 3 when ready to energize unit ECONOMI ER IV OCCUPANCY SWITCH See Fig 54 for general EconoMi er IV wiring External occupan cy control is managed through a connection on the Controls Con nections Board If external occupancy control is desired...

Page 44: ...st the belt tension as needed Adjust belt tension by loosing the motor mounting plate front bolts and rear bolt see Fig 56 and slide the plate towards the fan to reduce tension or away from the fan to increase tension Ensure the blower shaft and motor shaft are parallel to each other pulleys aligned Tighten all bolts securely when finished BELT TENSION METHOD Requires belt tension gauge that measu...

Page 45: ...s the mechanical installation of the unit Refer to the unit s Service Manual for detailed Pre Start and Start Up instruc tions Download the latest versions from HVAC Partners www hvacpartners com BLOWER PULLEY V BELT MOTOR PULLEY MOTOR MOTOR MOUNTING PLATE MOUNTING BOLTS 4 ...

Page 46: ...right to discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53500282 01 Printed in U S A Form 50HCQ 12 03SI Pg 46 5 2020 Replaces 50HCQ 12 02SI 2020 Carrier ...

Page 47: ...reens are in place Y N _____ Verify that unit is level Y N _____ Check fan wheels and propeller for location in housing orifice and verify setscrew is tight Y N _____ Verify that fan sheaves are aligned and belts are properly tensioned Y N _____ Verify that scroll compressors are rotating in the correct direction Y N _____ Verify installation of thermostat Y N _____ III START UP COOLING CYCLE ELEC...

Page 48: ... for jumper 5 6 7 Jumper 5 6 7 must be cut and open Y N _____ 2 Open humidistat contacts Y N _____ 3 Start unit In cooling Close Y1 Y N _____ OBSERVE AND RECORD A Suction pressure _______________ PSIG B Discharge pressure _______________ PSIG C Entering air temperature _______________ F D Liquid line temperature at outlet or reheat coil _______________ F E Confirm correct rotation for compressor Y...

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