IV. Refrigerant Charge, Replacement Parts

IV. REFRIGERANT CHARGE

Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Unit panels must be in place when unit is operating during charging procedure.

This unit uses a ®xed-ori®ce refrigerant metering device lo- cated in the coil header. There is one ori®ce in each coil cir- cuit. The size of the ori®ce is stamped on the outside of the tube where the ori®ce is located. Ori®ces are factory-selected for optimum performance and are not designed to be changed in the ®eld. To determine if an ori®ce is plugged, disconnect power to the evaporator-fan motor and start the unit in Cool- ing mode. Observe the coil for an uneven frost pattern, indi- cating a plugged ori®ce.

A. No Charge

Use standard evacuating techniques. After evacuating sys- tem, weigh in the speci®ed amount of refrigerant. (Refer to Table 1.)

B. Low Charge Cooling

Using Cooling Charging Charts, Fig. 40-43, vary refrigerant until the conditions of the appropriate chart are met. Note the charging charts are different from type normally used. Charts are based on charging the units to the correct super- heat for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insu- late it so that outdoor ambient temperature does not affect the reading. Indoor-air cfm must be within the normal oper- ating range of the unit.

C. To Use Cooling Charging Charts

Take the outdoor ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine what suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully re- cover some of the charge. Recheck the suction pressure as charge is adjusted.

Example: (Fig. 42)

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . 85 F Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . 80 psig Suction Temperature should be . . . . . . . . . . . . . . . . 68 F (Suction Temperature may vary ± 5 F.)

D. Refrigerant Leaks

Proceed as follows to repair a refrigerant leak and to charge the unit:

1.Locate leak and ensure that refrigerant system pres- sure has been relieved.

2.Repair leak following accepted practices.

NOTE: Install a ®lter drier whenever the system has been opened for repair.

3.Add a small charge of R-22 refrigerant vapor to system and leak-test unit.

4.Evacuate refrigerant system if additional leaks are not found.

5.Charge unit with R-22 refrigerant, using a volumetric- charging cylinder or accurate scale. Refer to unit rating plate for required charge. Be sure to add extra refriger- ant to compensate for internal volume of ®lter drier.

V.REPLACEMENT PARTS

A complete list of replacement parts may be obtained from your distributor upon request.

Fig. 39 Ð Condenser-Fan Adjustment

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558D specifications

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