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Carrier 50ZHA024-060 Installation & Service Instructions Manual

Packaged heat pump units
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Installation, Start-Up and Service Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION ..........................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
Provide Unit Support ................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Place Unit..................................................................................2
Select and Install Ductwork .....................................................2
CHARGE ..................................................................4
Provide for Condensate Disposal .............................................4
Install Electrical Connections...................................................5
HIGH-VOLTAGE CONNECTIONS..................................5
ROUTING POWER LEADS INTO UNIT ........................6
ROUTING CONTROL POWER WIRES ..........................6
ACCESSORY ELECTRIC HEAT WIRING .....................6
PRE-START-UP ............................................................................6
START-UP .....................................................................................7
Check for Refrigerant Leaks ....................................................8
CHARGE THE UNIT AS FOLLOWS: .............................8
Refrigerant Charge....................................................................8
NO CHARGE ......................................................................8
LOW CHARGE COOLING ...............................................9
HEATING MODE CHARGE.............................................9
Indoor Airflow and Airflow Adjustments................................9
FOR 208/230-V .................................................................13
Unit Controls...........................................................................13
HIGH-PRESSURE RELIEF VALVE...............................13
LOSS OF CHARGE SWITCH.........................................13
COMPRESSOR OVERLOAD..........................................13
Sequence of Operation............................................................13
FAN OPERATION............................................................13
COOLING..........................................................................14
HEATING..........................................................................14
CONTINUOUS FAN ........................................................14
DEFROST..........................................................................14
ELECTRIC RESISTANCE HEATING............................14
MAINTENANCE.........................................................................15
Air Filter..................................................................................15
Unit Top Removal (Outdoor-Coil Side) ................................15
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Tab 6 8
Printed in U.S.A.
Catalog No. 50ZHA-1SI
Packaged Heat Pump Units
Fig. 1-Unit 50ZHA
Indoor Blower and Motor.......................................................15
Outdoor Fan ............................................................................16
Electrical Controls and Wiring...............................................16
Refrigerant Circuit ..................................................................17
Indoor Airflow ........................................................................17
Metering Devices ....................................................................17
Lubrication ..............................................................................17
Liquid Line Strainer................................................................17
High Flow Valves...................................................................17
TROUBLESHOOTING ...............................................................17
START-UP CHECKLIST............................................................17
NOTE TO INSTALLER-Before installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User's Manual and Replacement Guide are left with
the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified workers should install, repair, or service
air-conditioning equipment.
Untrained workers can perform basic maintenance functions of
cleaning coils and filters. All other operations should be performed
by trained service people. When working on air-conditioning
equipment, pay attention to precautions in the literature, tags, and
labels attached to the unit, and other safety precautions that may
apply.
Pg 1
50ZHA024-060
A05194
9-05
Replaces: New

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Summary of Contents for Carrier CARRIER 50ZHA024-060

  • Page 1: Table Of Contents

    Visit www.carrier.com Installation, Start-Up and Service Instructions NOTE: Read the entire instruction manual before starting the installation. TABLE OF CONTENTS SAFETY CONSIDERATIONS ...1 INTRODUCTION ...2 RECEIVING AND INSTALLATION ...2 Check Equipment...2 IDENTIFY UNIT ...2 INSPECT SHIPMENT ...2 Provide Unit Support ...2 SLAB MOUNT ...2...

  • Page 2: Introduction

    Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest Carrier Distributor if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.

  • Page 4: Converting Horizontal Discharge Units To Downflow (Vertical) Discharge

    UNIT ELECTRICAL CHARACTERISTICS 50ZHA024 208/230-1-60 50ZHA030 208/230-1-60 50ZHA036 208/230-1-60 50ZHA042 208/230-1-60 50ZHA048 208/230-1-60 50ZHA060 208/230-1-60 are field-installed and must be removed from the indoor blower compartment prior to start-up, even if they are not used for installation. When designing and installing ductwork, consider the following: UNIT DAMAGE HAZARD Failure to follw this caution may result in damage to unit components.

  • Page 5: Install Electrical Connections

    UNIT 50ZHA OPERATING WEIGHT (lbs) COMPRESSOR TYPE REFRIGERANT Charge (lb) REFRIGERANT METERING DEVICE Orifice ID (in.) Orifice OD (in.) CONDENSER COIL Rows...Fins/in. Face Area (sq. ft.) CONDENSER FAN Nominal Cfm Diameter (in.) Motor HP (RPM) EVAPORATOR COIL Face Area (sq. ft.) Evaporator Blower Nominal Airflow (CFM) Size (in.)

  • Page 6: Routing Power Leads Into Unit

    RETURN TOP COVER POWER AND LOW-VOLTAGE ENTRY COMPOSITE RUST-PROOF BASEPAN Power Wiring CONDENSATE DRAIN Control Wiring CONNECTION Condenser Airflow *Separate disconnect per NEC (National Electrical Code) required for electric heater when single- Evaporator Airflow point conection is not used. Fig. 4—Typical installation 1”...
  • Page 7 Model Size 75 (24) 17.5 (9.7) 21 (11.7) Table 5—Required Liquid Line Temperature REQUIRED LIQUID LINE TEMPERATURE FOR A SPECIFIC SUBCOOLING (R-22) Required Subcooling (°F) Pressure (psig) b. Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak.

  • Page 8: Start-Up

    Step 3—Refrigerant Charge Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 2. Refer to Carrier Refrigerant Service Techniques Manual, Refrigerants section. Unit panels must be in place when unit is operating during charging procedure. Unit must C00011 operate a minimum of 15 minutes before checking charge.

  • Page 9: Low Charge Cooling

    Thermostat Unit Control and subbase Fig. 10A—Control Connections (Sizes 024-042) Unit Control Thermostat Power and subbase Fig.10B—Control Connections (Sizes 048-060) LOW CHARGE COOLING 024-042 units: 1. Measure suction line pressure by attaching a gauge to the service port. 2. Measure the suction line temperature by attaching a tempera- ture sensing device to it.
  • Page 10 A05199 Fig. 11A—Typical Unit Electrical Diagram (Sizes 024-042)
  • Page 11 A05200 Fig. 11B—Typical Unit Electrical Diagram (Sizes 048-060)
  • Page 12 VOLTAGE RANGE UNIT SIZE V-PH-HZ 50ZHA 208/230–1–60 208/230–1–60 208/230–1–60 208/230–1–60 208/230–1–60 208/230–1–60 FLA Full Load Amps LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection RLA Rated Load Amps NOTES: 1. In compliance with NEC (National Electrical Code) requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be Power Supply fuse.

  • Page 13: For 208/230-V

    IFR (provided there is not a call for cooling). The contacts open and the IFM is deenergized. The IFM will be energized only when there is a call for cooling, in heat pump heating mode or if the unit is equipped with accessory electric heat, the indoor-fan motor will also run while the accessory electric heat is energized.

  • Page 14: Cooling

    OD Temp. (°F) — — — — — — — — — — — — — — — — OD Temp. (°C) — — — — — — — — — — — — — — — — COOLING OPERATION (SIZES 024-042) With a call for cooling (Y/Y2), the indoor fan energizes immedi- ately whereas the contactor energizes after a 5 minute time delay (in case of initial start-up) starting the compressor and the outdoor...

  • Page 15: Maintenance

    be performed on this equipment. This cooling unit should be inspected at least once each year by a qualified service person. To troubleshoot cooling of units, refer to Troubleshooting chart in back of book. NOTE TO EQUIPMENT OWNER: Consult your local dealer about the availability of a maintenance contract.

  • Page 16: Outdoor Coil, Indoor Coil, And Condensate Drain Pan

    UNIT SIZE .027 .034 .036 .042 a. Slip the wheel back in the housing with the hub set screw parented in the correct direction. b. Install the filler panel. c. Reinsert the motor assembly in the wheel hub and align the mounting legs with the housing mounting hold locations.

  • Page 17: Refrigerant Circuit

    Fig. 13—Outdoor-Fan Adjustment (060 Size) After inspecting the electrical controls and wiring, replace all the panels. Start the unit, and observe at least one complete cooling cycle to ensure proper operation. If discrepancies are observed in operating cycle, or if a suspected malfunction has occurred, check each electrical component with the proper electrical instrumenta- tion.
  • Page 18 2. The refrigerant then feeds the outdoor coil through the Acutrol metering device on each circuit. Fig. 14—Typical Heat Pump Operation, Heating Mode OUTDOOR COIL Check Valves Closed...
  • Page 19 Table 12—Troubleshooting—Cooling and Heating SYMPTOM Compressor and outdoor fan will not start. Compressor will not start but outdoor fan runs. Compressor cycles (other than normally satisfying thermostat). Compressor operates continuously. Excessive head pressure. Head pressure too low. Excessive suction pressure. Suction pressure too low.
  • Page 20 †Measured at liquid line leaving outdoor coil Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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