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Carrier 50ZHA024-060 manual

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Table of contents for the manual

  • Page 1

    50ZHA024-060 Packaged Heat Pump Units Installation, Start-Up and Service Instructions NOTE: Read the entire instruction manual before starting the installation. TABLE OF CONTENTS SAFETY CONSIDERATIONS .....................................................1 INTRODUCTION ..........................................................................2 RECEI[...]

  • Page 2

    Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations. FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Before performing service or maintenance opera[...]

  • Page 3

    Fig. 2—Unit Base Dimensions, 50ZHA024-060 A05201 3[...]

  • Page 4

    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. When connecting ductwork to units, do not drill deeper tha[...]

  • Page 5

    Step 7—Install Electrical Connections ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. The unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of an electrical wire connected t[...]

  • Page 6

    Table 3—Minimum Airflow for Safe Electric Heater Operation (CFM) SIZE 024 030 036 042 048 060 Cfm 600 750 900 1050 1200 1500 UNIT DAMAGE HAZARD Failure to follow this caution may result in unit component damage. Operation of unit on improper line voltage consti- tutes abuse and may cause unit damage that could affect warranty. ROUTING POWER LEADS[...]

  • Page 7

    b. Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing connections using electronic leak detector, or liquid-soap solution. If a refrig- erant leak is detected, see following Check for Refrigerant Leaks section. c. Inspect all field- and facto[...]

  • Page 8

    START-UP Use the Start-Up Checklist supplied at the end of this book and proceed as follows: Step 1—Check for Refrigerant Leaks LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS: 1. Using both high- and low-pressure ports, locate leaks and reclaim remaining refrigerant to relieve system pressure. 2. Repair leak following accepted[...]

  • Page 9

    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. 3. Insulate the temperature sensing device so that the outdoor ambient doesn’t affect the reading. 4. Locate the measured suction line pressure in t[...]

  • Page 10

    Fig. 11A—Typical Unit Electrical Diagram (Sizes 024-042) A05199 10[...]

  • Page 11

    A05200 Fig. 11B—Typical Unit Electrical Diagram (Sizes 048-060) 11[...]

  • Page 12

    Fig. 11C—Accessory Electric Heater Wiring A05209 Table 6—Electrical Data—50ZHA UNIT SIZE 50ZHA V-PH-HZ VOLTAGE RANGE COMPRESSOR OFM FLA IFM FLA ELECTRIC HEAT SINGLE POINT POWER SUPPLY MIN MAX RLA LRA Nominal KW* FLA MCA FUSE OR CKT BKR MOCP 024 208/230–1–60 187 253 10.9 54.0 0.9 4.1 —/— 3.8/5.0 7.5/10.0 5.4/7.2 —/— 18.1/20.8 36.1/[...]

  • Page 13

    SIZE RATED AIRFLOW HIGH AIRFLOW Low Stage High Stage Low Stage High Stage 048 Tap 1 Tap 3 Tap 2 Tap 4 060 Tap 1 Tap 3 Tap 2 Tap 4 Step 5—Unit Controls All compressors have the following internal-protection controls. HIGH-PRESSURE RELIEF VALVE This valve opens when the pressure differential between the low and high side becomes excessive. LOSS OF [...]

  • Page 14

    COOLING OPERATION (SIZES 024-042) With a call for cooling (Y/Y2), the indoor fan energizes immedi- ately whereas the contactor energizes afte ra5m inute time delay (in case of initial start-up) starting the compressor and the outdoor fan motor. When the cooling demand is met, Y/Y2 de-energizes, shutting the compressor, indoor fan and the outdoor fa[...]

  • Page 15

    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. FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD F[...]

  • Page 16

    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. d. Tighten the mounting bolts to fasten the motor assembly with the housing. e. Center the wheel in the hou[...]

  • Page 17

    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. Refer to [...]

  • Page 18

    Fig. 14—Typical Heat Pump Operation, Heating Mode C95045 STRAINER ACCUMULA TOR COMPRESSOR STRAINER LCS OUTDOOR COIL INDOOR COIL A B D C Check V alves A Open B Closed C Open D Closed LEGEND LCS Loss of Charge Switch Acutrol Metering Device Check V alve (Arrow indicates direction of flow) HEA TING CYCLE 1. Hot gas from compressor flows through the [...]

  • Page 19

    Table 12—Troubleshooting—Cooling and Heating SYMPTOM CAUSE REMEDY Compressor and outdoor fan will not start. Power Failure Call power company Loss of Charge Switch open Evaluate unit for possible refrigerant leak Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat, contractor, transformer, or control[...]

  • Page 20

    START-UP CHECKLIST (REMOVE AND STORE IN JOB FILE) I. PRELIMINARY INFORMATION Model No ............................................................................................................................................................. Serial No ................................................................................................[...]