Bryant 558F B. To Use Cooling Charging Charts, Viii. High-Pressureswitch, X. Freezestat

B. To Use Cooling Charging Charts

This method is to be used in Cooling mode only. Take the out- door 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 recover some of the charge. Recheck the suction pressure as charge is adjusted.

EXAMPLE: (Fig. 44; Circuit 1)

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F

Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74 psig

Suction Temperature should be . . . . . . . . . . . . . . . . . . . . 54 F (Suction Temperature may vary ± 3 F.)

VIII. HIGH-PRESSURE SWITCH

Located on the compressor hot gas line is a high-pressure switch. This switch opens at 428 psig and closes at 320 psig. No adjustment is necessary. Refer to Tables 1A and 1B.

IX. LOSS-OF-CHARGE SWITCH

Located on the condenser liquid line is a low-pressure switch which functions as a loss-of-charge switch. This switch con- tains a Schrader core depressor. This switch opens at 7 psig and closes at 22 psig. No adjustment is necessary. Refer to Tables 1A and 1B.

X. FREEZESTAT

Located on the “hair pin” end of the evaporator coil is a bimetal temperature sensing switch. This switch protects the evaporator coil from freeze-up due to lack of airflow. The switch opens at 30 F and closes at 45 F. No adjustment is necessary. Refer to Tables 1A and 1B.

XI. REPLACEMENT PARTS

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

CIRCUITS 1 AND 2

Fig. 41 — Cooling Charging Chart; 558F090

CIRCUIT NO. 1 CIRCUIT NO. 2

Fig. 42 — Cooling Charging Chart; 558F102

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