Carrier 50ZH024-060- Manuals

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 practices. NOTE: Install a liquid-line filte...

charts to determine what the suction temperature should be. Ifsuction temperature is high, add refrigerant. If suction temperatureis low, carefully recover some of the charge. Recheck the suctionpressure as charge is adjusted. Example: (See Fig. 16)Outdoor Temperature —85°FSuction Pressure—74 psigSu...

NOTE: Be sure that all supply- and return-air grilles are open, free from obstructions, and adjusted properly. Disconnect electrical power to the unit and install lockout tagbefore changing blower speed. Electrical shock can causeserious injury or death. Airflow can be changed by changing the lead c...

Table 3—Electrical Data—50ZH UNIT 50ZH SIZE (–SERIES, IF USED) 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 024–311 208/230–1–60 187 254 11.4 56.0 0.9 2.4 -/- 3.8/5.05.6/7.5 7.5/10.0 -/- 18.3/20.826....

NOTE: Some units are equipped with a time-delay relay. On these units, the indoor fan remains on for 30 seconds after G or Yis deenergized. COOLING With the thermostat subbase in the cooling position, the thermostatmakes circuit R-O. This energizes the reversing valve solenoid(RVS) and places the un...

supplemental electric heat. When thermostat is satisfied, contactsopen, deenergizing contactor and relay; motors and heaters deen-ergize. The IFM may be controlled by a time-delay relay that keepsthe fan on for 30 seconds. DEFROST Defrost board (DB) is a time and temperature control, whichincludes a...

mild detergent-and-water-solution. Rinse coils with clear water,using a garden hose. Be careful not to splash water on motors,insulation, wiring or air filter(s). For best results, spray outdoor-coil fins from inside to outside the unit. On units with an outer andinner outdoor coil, be sure to clean...

Step 6—Electrical Controls and Wiring Inspect and check the electrical controls and wiring annually. Besure to turn off the electrical power to the unit and install lockouttag. Remove the top panel to locate all the electrical controls andwiring. Check all electrical connections for tightness. Tight...

Check valves are also located in the liquid lines near the strainers.The Strainers are the larger of the two components. Step 12—High Flow Valves Located on the compressor hot gas and suction tubes are HighFlow Valves. Large black plastic caps distinguish these valveswith O-rings located inside the ...

Fig. 24–Typical Heat Pump Operation, Cooling Mode C95044 STRAINER ACCUMULA T O R COMPRESSOR STRAINER LCS OUTDOOR COIL INDOOR COIL A B D C Check Valves A Closed B Open C Closed D Open LEGEND LCS Loss of Charge Switch Acutrol Metering Device Check Valve (Arrow indicates direction of flow) COOLING CYCL...

Fig. 25–50ZH Balance Point Chart C01038 Balance Point Worksheet 0 10000 20000 30000 40000 50000 60000 70000 80000 -10 0 10 20 30 40 50 60 Outdoor Air Temp (Deg F) 024 030 036 042 048 060 Building Heat Loss, BTUH Unit Integrated Heating Capacity (BTUH) 21

Table 8—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 th...

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

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 practices. NOTE: Install a liquid-line filte...

charts to determine what the suction temperature should be. Ifsuction temperature is high, add refrigerant. If suction temperatureis low, carefully recover some of the charge. Recheck the suctionpressure as charge is adjusted. Example: (See Fig. 16)Outdoor Temperature —85°FSuction Pressure—74 psigSu...

NOTE: Be sure that all supply- and return-air grilles are open, free from obstructions, and adjusted properly. Disconnect electrical power to the unit and install lockout tagbefore changing blower speed. Electrical shock can causeserious injury or death. Airflow can be changed by changing the lead c...

Table 3—Electrical Data—50ZH UNIT 50ZH SIZE (–SERIES, IF USED) 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 024–311 208/230–1–60 187 254 11.4 56.0 0.9 2.4 -/- 3.8/5.05.6/7.5 7.5/10.0 -/- 18.3/20.826....

NOTE: Some units are equipped with a time-delay relay. On these units, the indoor fan remains on for 30 seconds after G or Yis deenergized. COOLING With the thermostat subbase in the cooling position, the thermostatmakes circuit R-O. This energizes the reversing valve solenoid(RVS) and places the un...

supplemental electric heat. When thermostat is satisfied, contactsopen, deenergizing contactor and relay; motors and heaters deen-ergize. The IFM may be controlled by a time-delay relay that keepsthe fan on for 30 seconds. DEFROST Defrost board (DB) is a time and temperature control, whichincludes a...

mild detergent-and-water-solution. Rinse coils with clear water,using a garden hose. Be careful not to splash water on motors,insulation, wiring or air filter(s). For best results, spray outdoor-coil fins from inside to outside the unit. On units with an outer andinner outdoor coil, be sure to clean...

Step 6—Electrical Controls and Wiring Inspect and check the electrical controls and wiring annually. Besure to turn off the electrical power to the unit and install lockouttag. Remove the top panel to locate all the electrical controls andwiring. Check all electrical connections for tightness. Tight...

Check valves are also located in the liquid lines near the strainers.The Strainers are the larger of the two components. Step 12—High Flow Valves Located on the compressor hot gas and suction tubes are HighFlow Valves. Large black plastic caps distinguish these valveswith O-rings located inside the ...

Fig. 24–Typical Heat Pump Operation, Cooling Mode C95044 STRAINER ACCUMULA T O R COMPRESSOR STRAINER LCS OUTDOOR COIL INDOOR COIL A B D C Check Valves A Closed B Open C Closed D Open LEGEND LCS Loss of Charge Switch Acutrol Metering Device Check Valve (Arrow indicates direction of flow) COOLING CYCL...

Fig. 25–50ZH Balance Point Chart C01038 Balance Point Worksheet 0 10000 20000 30000 40000 50000 60000 70000 80000 -10 0 10 20 30 40 50 60 Outdoor Air Temp (Deg F) 024 030 036 042 048 060 Building Heat Loss, BTUH Unit Integrated Heating Capacity (BTUH) 21

Table 8—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 th...

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