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charts to determine what the 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: (See Fig. 16)
Outdoor Temperature —85°F
Suction Pressure—74 psig
Suction Temperature should be—60°F
Note—Suction Temperature may vary +/- 5°F.
HEATING MODE CHARGE
Do not attempt to adjust charge by cooling methods while in heat
pump heating mode. Recover refrigerant and weigh in according to
unit data plate refrigerant data.
Step 4—Indoor Airflow and Airflow Adjustments
NOTE: For cooling operation, the recommended airflow is 350 to
450 cfm per each 12,000 Btuh of rated cooling capacity.
Table 4 shows dry coil air delivery for horizontal discharge units.
Tables 5-7 show pressure drops.
Fig. 15A—Typical Unit Electrical Diagram (208/230–1–60)
C01022
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