Carrier WeatherMaker 50TCQ 17-24 Series Service And Maintenance Instructions
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Carrier WeatherMaker 50TCQ 17-24 Series Service And Maintenance Instructions

Single package rooftop unit with heat pump with puron (r-410a) refrigerant
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Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 2
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 3
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . 3
Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Adjustable-Pitch Pulley on Motor . . . . . . . . . . . . . . . 4
Changing the Fan Speed . . . . . . . . . . . . . . . . . . . . . . 5
Aligning Fan and Motor Pulleys . . . . . . . . . . . . . . . . 5
Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DRIVE (VFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Identifying Factory Option . . . . . . . . . . . . . . . . . . . . . 5
Unit Installation with SAV Option . . . . . . . . . . . . . . . 6
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 6
HEAT PUMP REFRIGERATION SYSTEM . . . . . . . . . 6
Outdoor Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Indoor Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Refrigeration System Components . . . . . . . . . . . . . . 8
Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacing TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PURON (R-410A) REFRIGERANT . . . . . . . . . . . . . . 12
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 12
How To Use Cooling Charging Charts . . . . . . . . . . 12
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . 13
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Troubleshooting Cooling System . . . . . . . . . . . . . . 17
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . 19
Installing Weatherproof Cover . . . . . . . . . . . . . . . . . 19
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fuse on Power Type . . . . . . . . . . . . . . . . . . . . . . . . . 20
HEAT PUMP CONTROLS . . . . . . . . . . . . . . . . . . . . . 20
Central Terminal Board . . . . . . . . . . . . . . . . . . . . . . 20
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500229-01
Single Package Rooftop Unit with Heat Pump
Page
Printed in U.S.A.
Form 50TCQ-17-24-02SM
with Puron
®
PROTECTIVE CONTROLS . . . . . . . . . . . . . . . . . . . . .21
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . .21
Supply (Indoor) Fan Motor Protection . . . . . . . . . . .21
Outdoor Fan Motor Protection . . . . . . . . . . . . . . . . .21
Control Circuit, 24v . . . . . . . . . . . . . . . . . . . . . . . . . .21
COMMERCIAL DEFROST CONTROL . . . . . . . . . . . .21
Reversing Valve Control . . . . . . . . . . . . . . . . . . . . . .22
Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . .22
Auxiliary (Electric) Heat Control . . . . . . . . . . . . . . . .22
Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Indoor Fan Off Delay . . . . . . . . . . . . . . . . . . . . . . . . .23
Defrost Speedup Functions . . . . . . . . . . . . . . . . . . .23
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . .23
Completing Heater Installation . . . . . . . . . . . . . . . . .26
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . .26
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . .27
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . 30
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . .32
INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Normal State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Alarm State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
PremierLink™ Control . . . . . . . . . . . . . . . . . . . . . . . .33
RTU Open Control System . . . . . . . . . . . . . . . . . . . .33
ECONOMI$ER SYSTEMS . . . . . . . . . . . . . . . . . . . . . .33
EconoMi$er IV Standard Sensors . . . . . . . . . . . . . . 38
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . .43
PRE-START-UP / START-UP . . . . . . . . . . . . . . . . . . .57
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .57
Additional Installation/Inspection . . . . . . . . . . . . . .57
START-UP, PREMIERLINK CONTROLS . . . . . . . . . .58
START-UP, RTU-OPEN CONTROLS . . . . . . . . . . . . .58
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . .59
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .60
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .61
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . .64
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . .67
LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
Pg 1
8-2020
WeatherMaker
50TCQ*17-24
(R-410A) Refrigerant
Replaces: 50TCQ-17-24-01SM
®

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Summary of Contents for Carrier WeatherMaker 50TCQ 17-24 Series

  • Page 1: Table Of Contents

    WeatherMaker ® 50TCQ*17-24 Single Package Rooftop Unit with Heat Pump with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions CONTENTS PROTECTIVE CONTROLS .....21 Compressor Protection .

  • Page 2: Safety Considerations

    SAFETY CONSIDERATIONS WARNING Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only FIRE, EXPLOSION HAZARD trained and qualified service personnel should install, repair, or service air-conditioning equipment. Failure to follow this warning could result in death, serious personal injury and/or property damage.

  • Page 3: Seasonal Maintenance

    • Check belt tension Installing the return filters and access panel: • Check belt condition Slide the filters into the slide-out racks. • Inspect pulley alignment Place the vertical filter access panel on the unit. • Check fan shaft bearing locking collar tightness Replace the mounting hardware attaching the panel to the unit and tighten securely.

  • Page 4: Belt

    CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this CAUTION can result in premature wear and damage to equipment. Do not use a screwdriver or a pry bar to place the new V-belt in the pulley groove. This can cause stress on the V-belt and the pulley resulting in premature wear on the V-belt and damage to the pulley.

  • Page 5: Changing The Fan Speed

    As the pitch diameter is changed by adjusting the position of the LOCKING COLLAR movable flange, the centerline on this pulley shifts laterally (along the motor shaft). This creates a requirement for a realignment of the pulleys after any adjustment of the movable flange. Reset the belt tension after each realignment.

  • Page 6: Unit Installation With Sav Option

    ® HEAT PUMP REFRIGERATION SYSTEM Cleaner is essential in extending the life of coils. This cleaner is available from Carrier Replacement Components Division (P/N P902-0301 for a one gallon (3.8L) container, and P/N P902-0305 WARNING for a 5 gallon (19L) container). It is recommended that all coils...
  • Page 7 • poor quality water for cleaning Totaline Environmentally Sound Coil Cleaner is non-flammable, hypoallergenic, non bacterial and a USDA accepted biodegrad- able agent that will not harm the coil or surrounding components, such as electrical wiring, painted metal surfaces or insulation. Use of non-recommended coil cleaners is strongly discouraged be- cause coil and unit durability can be affected.

  • Page 8: Refrigeration System Components

    with the cleaner. The optimum solution temperature is 100°F Refrigeration System Components (38°C). Each heat pump refrigeration system includes a compressor, accu- mulator, reversing valve, dual-function outdoor coil with vapor NOTE: Do NOT USE water in excess of 130°F (54°C), as the en- header check valve, cooling liquid line with a filter drier and a zymatic activity will be destroyed.

  • Page 9: Reversing Valve And Check Valve Position

    EVAPORATOR CONDENSING COIL CIRCUIT CIRCUITS FROM FROM TRANSFER LIQUID HEADER HEADER Fig. 16 — Heat Pump Accutrol — Flow as Condenser Fig. 14 — Heat Pump — Flow as Evaporator Function Function/Entering Second Pass OUTDOOR COILS ONLY FROM Converging circuit flow in the condenser-function operation is ac- DFT LOCATION complished with the check valve in the vapor header and the liq- SUBCOOLER...

  • Page 10: Troubleshooting Refrigerant Pressure Problems And

    Troubleshooting Refrigerant Pressure Problems To check the outdoor coil, disconnect the outdoor fan motor. Start the circuit in a Heating Mode (jumper R to W1 or W2) and ob- and Check Valves serve the frost pattern on the face of the outdoor coil. Refer to Fig.

  • Page 11: Thermostatic Expansion Valve (Txv)

    Attach equalizer tube to suction line. If coil has mechanical The needle valve on the pin carrier is spring loaded, exerting connection, then use wrench and back up wrench to attach. If pressure on the underside of the diaphragm. Therefore, the...

  • Page 12: Puron (R-410A) Refrigerant

    Puron (R-410A) refrigerant from the cylinder as a vapor. Refrigerant Charge The amount of refrigerant charge is listed on the unit’s name- plate. Refer to Carrier Publication, “GTAC2-5 Charging, Recov- ery, Recycling and Reclamation Training Manual” and the fol- lowing procedures.

  • Page 13: Cooling Charging Charts

    COOLING CHARGING CHARTS CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 15 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING MODE) - CIRCUIT A Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501614 - A IN HEATING MODE,...
  • Page 14 CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 15 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING MODE) - CIRCUIT B Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501615 - A IN HEATING MODE,...
  • Page 15 CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 20 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING MODE) - CIRCUIT A Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501616 - A IN HEATING MODE,...
  • Page 16 CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 20 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING CODE) - CIRCUIT B Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501617 - A IN HEATING MODE,...

  • Page 17: Compressors

    Compressors On 3-phase units with scroll compressors, it is important to be cer- tain compressor is rotating in the proper direction. LUBRICATION To determine whether or not compressor is rotating in the proper Compressors are charged with the correct amount of oil at the direction: factory.
  • Page 18 Table 5 — Heating and Cooling Troubleshooting PROBLEM CAUSE REMEDY Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Determine root cause. Defective thermostat, contactor, transformer, control relay, or Replace component. capacitor. Compressor and Insufficient line voltage.

  • Page 19: Convenience Outlets

    CONVENIENCE OUTLETS Remove the blank cover plate at the convenience outlet; dis- card the blank cover. Loosen the two screws at the GFCI duplex outlet, until WARNING approximately -in. (13 mm) under screw heads are exposed. ELECTRICAL OPERATION HAZARD 3. Press the gasket over the screw heads. Slip the backing Failure to follow this warning could result in personal injury or plate over the screw heads at the keyhole slots and align death.

  • Page 20: Duty Cycle

    HEAT PUMP CONTROLS Central Terminal Board The Central Terminal Board (CTB) is a large printed circuit board that is located in the center of the unit control box. This printed cir- cuit board contains multiple termination strips and connectors to simplify factory control box wiring and field control connections.

  • Page 21: Protective Controls

    PROTECTIVE CONTROLS typically develop when the unit is operated with an access panel removed, with unfinished duct work, in an economizer-open Compressor Protection mode, or a leak develops in the duct system that allows a bypass back to unit return opening. OVER-CURRENT Outdoor Fan Motor Protection The compressor has internal line-break motor protection.

  • Page 22: Reversing Valve Control

    Table 8 — 50TCQ Defrost Board I/O and Jumper Configurations INPUTS POINT NAME TYPE OF I/O CONNECTION PIN NUMBER UNIT CONNECTION NOTE G Fan DI, 24Vac P2–3 LCTB–G Y1 Cool 1 DI, 24Vac P2–5 LCTB–Y1 Y2 Cool 2 DI, 24Vac P2–4 LCTB–Y2 W1 Heat 1...

  • Page 23: Indoor Fan Off Delay

    Table 9 — Dip Switch Position          90 minutes 60 minutes 30 minutes 120 minutes Fan Delay At the end of the continuous run period, the defrost control will Shorting the jumpers for a period of 5 to 20 seconds bypasses the test for a need to defrost.
  • Page 24 INDOOR BLOWER BLOWER CONTROL BOX FILTER ACCESS PANEL ACCESS ACCESS ACCESS PANEL PANEL PANEL ELECTRIC HEATER SECTION MAIN CONTROL FILTER HEATER ACCESS PANEL MODULE AREA Fig. 34 — Typical Access Panel Location Fig. 35 — Typical Component Location Fig. 36 — Typical Module Installation Table 10 —...

  • Page 25: Single Point Boxes And Supplementary Fuses

    Single Point Boxes and Supplementary Fuses When the unit MOCP device value exceeds 60-A, unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in accessory single point box, with power distri- bution and fuse blocks. The single point kit fuse holder and termi- nal block will be installed into the unit control box-back wall, bot- tom left corner.

  • Page 26: Completing Heater Installation

    Completing Heater Installation FIELD POWER CONNECTIONS Tap conductors must be installed between the base unit’s field power connection lugs and the single point box (with or without fuses). See Fig. 32. Refer to unit wiring schematic. Use copper wire only. For connection using the single point box without fuses, connect the field power supply conductors to the heater power leads and the field-supplied tap conductors inside the single point Duct smoke sensor...

  • Page 27: Smoke Detector Locations

    bracket high on the partition between return filter and controller location. (This sensor is shipped in a flat-mounting location. In- stallation requires that this sensor be relocated to its operating lo- cation and the tubing to the sampling tube be connected. See “Completing Installation of Return Air Smoke Sensor”...
  • Page 28 Locate seal-tight assembly and secure it to the adapter. Snap seal-tight into the smoke sensor. Remove -in. knockout plug in blower side plate. Refer to Fig. 45 for location depending on the configuration of the unit. Snap seal-tight assembly into knockout hole. 10.
  • Page 29 PICK-UP TUBE EMT TO SEAL TIGHT CONNECTOR BRACKET DETAIL A KNOCKOUT LOCATION FOR HORIZONTAL SEE DETAIL A HORIZONTAL ASSEMBLY KNOCKOUT LOCATION FOR VERTICAL VERTICAL ASSEMBLY SEE DETAIL A Fig. 45 — Supply Air Smoke Detector Sensor Location...

  • Page 30: Fiop Smoke Detector Wiring And Response

    Fig. 46 — Typical Smoke Detector System Wiring RTU-OPEN FIOP Smoke Detector Wiring and Response The 24-v signal is conveyed to the RTU-OPEN J1-10 input termi- All units: FIOP smoke detector is configured to automatically shut nal. This signal initiates the FSD sequence by the RTU-OPEN down all unit operations when a smoke condition is detected.
  • Page 31 Verify that the sensor’s Alarm LED turns off. Dirty Sensor Test Procedure Hold the test magnet where indicated on the side of the sensor CONTROLLER ALARM TEST housing for two seconds. The controller alarm test checks the controller’s ability to initiate Verify that the sensor’s Dirty LED flashes.

  • Page 32: Detector Cleaning

    Disconnect power from the duct detector then remove the sensor’s cover. (See Fig. 48.) Using a vacuum cleaner, clean compressed air, or a soft bris- SMOKE DETECTOR tle brush, remove loose dirt and debris from inside the sensor CONTROLLER housing and cover. Use isopropyl alcohol and a lint-free cloth −...

  • Page 33: Resetting Alarm And Trouble Condition Trips

    Table 12 — Detector Indicators CONTROL OR INDICATOR DESCRIPTION Magnetic test/reset switch Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in the normal state. Alarm LED Indicates the sensor is in the alarm state. Trouble LED Indicates the sensor is in the trouble state.
  • Page 34 controller is used for EconoMi$er IV and the W7220 controller is WIRING HARNESS used for EconoMi$er X.system See Fig. 53-56 for EconoMi$er section wiring diagrams. All three economizers use direct-drive damper actuators. OUTSIDE AIR TEMPERATURE SENSOR ECONOMI$ER IV CONTROLLER OUTSIDE AIR WIRING TEMPERATURE SENSOR HARNESS...
  • Page 35 Fig. 53 — RTU Open Overlay for Economizer Wiring...
  • Page 36 Fig. 54 — VFD Overlay for W2770 Controller Wiring...
  • Page 37 FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK LEGEND Potentiometer Defaults Settings: Power Exhaust Middle — Demand Controlled Ventilation Minimum Pos. Fully Closed DCV Max. Middle — Indoor Air Quality DCV Set Middle — Low Ambient Lockout Device Enthalpy C Setting —...

  • Page 38: Economi$Er Iv Standard Sensors

    An outdoor-air temperature is used to determine when the EconoMi$er IV simulator program is available from Carrier to EconoMi$er IV can be used for free cooling. The sensor is facto- help with EconoMi$er IV training and troubleshooting.
  • Page 39 SUPPLY AIR TEMPERATURE (SAT) SENSOR accessories can be added to allow for different types of change- over control and operation of the EconoMi$er IV and unit. The supply air temperature sensor is a 3 K thermistor located at the inlet of the indoor fan. (See Fig. 58.) This sensor is factory in- OUTDOOR DRY BULB CHANGEOVER stalled.
  • Page 40 turn the enthalpy setpoint potentiometer fully clockwise to the D setting. (See Fig. 60.) ECONOMI$ER IV CONTROLLER 24 Vac ECONOMI$ER IV Open GROMMET RETURN AIR Free SENSOR Cool RETURN DUCT (FIELD-PROVIDED) Fig. 62 — Return-Air Temperature or Enthalpy Sensor Mounting Location Fig.
  • Page 41 3. Ensure that the factory-installed jumper is in place across CO SENSOR MAX RANGE SETTING terminals P and P1. If remote damper positioning is being 6000 used, make sure that the terminals are wired according to Fig. 60 and that the minimum position potentiometer is 5000 turned fully clockwise.
  • Page 42 See Table 14. continue to the next variable. Use setting 1 or 2 for Carrier equipment. See Table 14. DEHUMIDIFICATION OF FRESH AIR WITH DCV 1. Press Clear and Mode buttons. Hold at least 5 seconds (DEMAND CONTROLLED VENTILATION) CONTROL until the sensor enters the Edit mode.

  • Page 43: Economi$Er® X (Factory Option)

    7. If connected, remove sensor from terminals SO and +. DCV MINIMUM AND MAXIMUM POSITION Connect 1.2 kilo-ohm 4074EJM checkout resistor across To check the DCV minimum and maximum position: terminals SO and +. 1. Make sure EconoMi$er IV preparation procedure has been 8.
  • Page 44 • Relay Digital Output Rating at 30 vac (maximum power from Class 2 input only) — 1.5A run: 3.5A inrush at 0.45PF (200,000 cycles) or 7.5A inrush at 0.45PF (100,000 cycles) • External Sensors Power Output — 21 vdc ± 5% at 48mA IMPORTANT: All inputs and outputs must be Class 2 wiring.
  • Page 45 NOTE: The four terminal blocks are removable. Slide out each Table 16 — Economizer Module terminal block, wire it, and then slide it back into place. (Right Hand Terminal Blocks) LABEL TYPE DESCRIPTION Top Right Terminal Blocks AUX2 I 24 vac IN The first terminal is not used.
  • Page 46 To use the keypad when working with menus: Table 17 — HH57AC081 Sensor Wiring Terminations • Press the ▲ (Up arrow) button to move to the previous menu. TERMINAL TYPE DESCRIPTION • Press the ▼ (Down arrow) button to move to the next NUMBER LABEL menu.
  • Page 47 NOTE: Some parameters in the menus use the letters MA or The setup process uses a hierarchical menu structure that is easy to MAT, indicating a mixed air temperature sensor location before use. Press the ▲ and ▼ arrow buttons to move forward and back- the cooling coil.
  • Page 48 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DEMAND CONTROLLED VENTILATION STATUS DCV STATUS — ON/OFF Displays ON if above set point and OFF if below set point, and ONLY if a CO sensor is connected.
  • Page 49 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DCV MINIMUM DAMPER POSITION 2 to 10 vdc or 100 Displays only if a CO sensor is connected. Used for Va to 9990 cfm (ventilation min cfm) set point.
  • Page 50 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † COOLING STAGE 3 DELAY 0 min, 5 min, Delay after stage 2 cool has been active. Turns on second stage 15 min, then 15 min of cooling when economizer is first stage call and mechanical STG3 DLY...
  • Page 51 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † RA SYLK T ERR — — RETURN AIR S-BUS SENSOR ERROR Return air enthalpy sensor has failed or become disconnected - RA SYLK H ERR —...
  • Page 52 Table 20 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED VENTILATION FAN SPEED SETPOINTS CHECKOUT SENSOR) MIN POS VMAX–HS — — MIN POS H VMAX–HS MIN POS L VMAX–LS VENT MIN VMAX–HS VENT MAX VMAX–HS VENT MIN H VMAX–HS VENT MAX H VMAX–LS...
  • Page 53 Table 23 — Enthalpy Operation without DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED VENTILATION (DCV) ECONOMIZE High 0-v/Off 0-v/Off MIN POS Closed High 24-v/On 0-v/Off MIN POS Closed High 24-v/On...
  • Page 54 Table 26 — Dry Bulb Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
  • Page 55 Table 28 — Enthalpy Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed 0v/Off...
  • Page 56 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 71 — Single Enthalpy Curve Boundaries Table 30 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 57: Pre-Start-Up / Start-Up

    If one or more alarms are present and there has been no keypad ac- Proceed as follows to inspect and prepare the unit for initial start- tivity for at least 5 minutes, the Alarms menu displays and cycles through the active alarms. Remove all access panels.

  • Page 58: Start-Up, Premierlink Controls

    UNIT PREPARATION COOLING Ensure the unit has been installed in accordance with installation Set space thermostat to OFF position. To start unit, turn on main instructions and applicable codes. power supply. Set system selector switch at COOL position and fan switch to AUTO. position. Adjust thermostat to a setting be- RETURN-AIR FILTERS low room temperature.

  • Page 59: Fastener Torque Values

    FASTENER TORQUE VALUES Table 31 — Torque Values LOCATION TORQUE VALUES Supply fan motor 120 in.-lb (13.6 Nm) ± 12 in.-lb (1.4Nm) mounting Supply fan motor 120 in.-lb (13.6 Nm) ± 12 in.-lb (1.4Nm) adjustment plate Motor pulley setscrew 72 in.-lb (8.1 Nm) ± 5 in.-lb (0.6 Nm) Fan pulley setscrew 72 in.-lb (8.1 Nm) ±...

  • Page 60: Nomenclature

    APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packing 50 - Electric Heat 0 = Standard Packaged Rooftop Electrical Options Model Series - WeatherMaker ® A = None TC - Standard Efficiency C = Non-Fused Disconnect G = 2-Speed Indoor Fan (VFD) Controller...

  • Page 61: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling), 15 and 20 Tons — Round Tube/plate Fin (RTPF) Coil Design 50TCQD17 50TCQD24 REFRIGERATION SYSTEM # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 Scroll R-410A charge A/B (lbs) 16.0 / 16.5 23.4 / 23.4...
  • Page 62 APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling), 15 and 20 Tons — Round Tube/plate Fin (RTPF) Coil Design (cont) 50TCQD17 50TCQD24 EVAP. FAN AND MOTOR — HORIZONTAL Motor Qty. / Drive Type 1 / Belt — Max BHP —...
  • Page 63 APPENDIX C — FAN PERFORMANCE Table B — 50TCQD17 — 15 TON VERTICAL SUPPLY/RETURN AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 4500 0.60 0.89 1.20 1.54 1.90 4900 0.72 1.02 1.36 1.72 2.09 5250 0.85 1.16 1.51 1.88 2.27 5650 1.01 1.33 1.70 2.09...

  • Page 64: Appendix C - Fan Performance

    APPENDIX C — FAN PERFORMANCE Table C — 50TCQD17 — 15 TON HORIZONTAL SUPPLY/RETURN AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 4500 1.04 1.12 2.03 2.59 3.19 1.26 1.40 2.30 2.89 3.51 4900 1.48 1.60 2.57 3.18 3.82 5250 1.76 1.82 2.90 3.54 4.21...
  • Page 65 APPENDIX C — FAN PERFORMANCE Table D — 50TCQD24 — 20 TON VERTICAL SUPPLY/RETURN AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 6000 1.13 1.48 1.80 2.13 2.46 6500 1.36 1.75 2.11 2.46 2.82 7000 1.63 2.06 2.45 2.83 3.21 7500 1.93 2.40 2.83 3.24...
  • Page 66 APPENDIX C — FAN PERFORMANCE Table E — 50TCQD24 — 20 TON HORIZONTAL SUPPLY/RETURN AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 6000 2.04 2.61 3.22 3.88 4.58 6500 2.49 3.09 3.74 4.44 5.17 7000 3.01 3.65 4.33 5.06 5.82 7500 3.60 4.28 5.00 5.76...

  • Page 67: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS Table H — Unit Wiring Diagrams UNIT SIZE VOLTAGE CONTROL POWER 50HE500894 - L 208/230-3-60 (page 69) 50HE500937 - G 460-3-60 (page 68) 50HE500895 - L (page 70) 575-3-60 50HE500894 - L 208/230-3-60 (page 69) 50HE500937 - G 460-3-60 (page 68)
  • Page 68 APPENDIX D — WIRING DIAGRAMS Fig. B — 50TCQD17-24 Control Wiring Diagram...
  • Page 69 APPENDIX D — WIRING DIAGRAMS Fig. C — 50TCQD17-24 Power Wiring Diagram (208/230-3-60 Units)
  • Page 70 APPENDIX D — WIRING DIAGRAMS Fig. D — 50TCQD17-24 Power Wiring Diagram (460-3-60, 575-3-60 Units)
  • Page 71 APPENDIX D — WIRING DIAGRAMS Fig. E — RTU-Open Overlay...
  • Page 72 APPENDIX D — WIRING DIAGRAMS Fig. F — PremierLink Overlay...

  • Page 73: Appendix E - Motormaster Sensor

    APPENDIX E — MOTORMASTER SENSOR LOCATION SENSOR LOCATION Fig. G — 50TCQD17-24 Motormaster Sensor Location...
  • Page 74 © 2020 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500229-01 Printed in U.S.A. Form 50TCQ-17-24-02SM Pg 74 8-2020 Replaces: 50TCQ-17-24-01SM...

  • Page 75: Start-Up Checklist

    START-UP CHECKLIST — 50TCQ 17-24 SINGLE PACKAGE ROOFTOP WITH HEAT PUMP/ELECTRIC COOLING WITH PURON (R-410A) REFRIGERANT ® NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sec- tions of this Installation Instruction document.
  • Page 76 GENERAL Economizer minimum vent and changeover settings to job requirements (if equipped) (Y/N) _____ © 2020 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500229-01 Printed in U.S.A.

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