Using The Cooling Charging Charts; Cooling Charging Charts - Bryant Preferred 551J Service And Maintenance Instructions

Electric cooling/optional electric heat with puron (r-410a) refrigerant

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gage to the service port on the suction line. Mount the temperature

sensing device on the suction line and insulate it so the outdoor

ambient temperature does not affect the reading. Indoor-air cfm

must be within the normal operating range of the unit.

SIZE DESIGNATION

Using the Cooling Charging Charts

Take the outdoor coil leaving refrigerant temperature and read the

compressor discharge pressure gage. Refer to the chart to deter-

mine what the leaving temperature should be. If the leaving tem-

perature is high, add refrigerant.

NOMINAL TON REFERENCE

17.5

Fig. 21 — Cooling Charging Chart - 15 Ton

If the leaving temperature is low, carefully recover some of the

charge. Recheck the compressor discharge pressure as the charge

is adjusted.

Select the appropriate unit charging chart from Fig. 21-24.

Note the outdoor coil leaving refrigerant temperature and read the

compressor discharge pressure gage. Refer to the chart to deter-

mine what the leaving temperature should be. If the leaving tem-

perature is high, add refrigerant. If the leaving temperature is low,

carefully recover some of the charge. Recheck the compressor dis-

charge pressure as the charge is adjusted.

For sizes 17-28, perform this procedure once for Circuit A and

once for Circuit B.

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