Chapter 2: Installation
3.Referring to Chapter 3, start the A/C system and use the system controller to lower the room temperature setpoint
When fine tuning the charge on cool days, it may be necessary to restrict the airflow across the condenser coil to raise the pres- sure. The fan closest to the header must be running. When fine tuning the charge, ensure the pressures are correct for the type of refrigerant used. Refer to the tables in Section 2.10.3 for the operating temperature and pressure ranges for R410A refrigerant.
4.Block off a portion of the intake air to the condenser until a constant discharge pressure can be obtained. This will lower the possibility of overcharging. Allow the discharge pressure to rise to
5.Slowly meter liquid refrigerant through the suction side while watching the pressure gauges and monitoring superheat and
CAUTION
Add liquid refrigerant slowly to prevent the refrigerant oil from “washing out” of the compressor.
6.Take a superheat temperature reading near the feeler bulb from the auxiliary control module with the temperature measuring device well insulated. The ideal superheat temperature is
CAUTION
Do not exceed 20° F superheat. Exceeding this temperature may cause failure of the compressor.
7.While monitoring the pressure, take a
8.If necessary, (slowly) add liquid refrigerant to the suction side to achieve the correct
CAUTION
Remove the blockage from the air intake of the condenser.
9. Fill out the applicable sections of the Warranty Registration and
2.10.2.4 -30° F Ambient Applications
NOTE: For units designed for
1.Follow Steps
NOTE: Do not exceed 80% of the total condenser and receiver volume to allow room for expansion.
2.A refrigerant level sight glass is located on the side of the receiver to assist the service technician in charging the
3.Keep the air intake to the condenser blocked and maintain the discharge pressure at 445 psig and hold it constant. The condenser fan nearest the condenser header should be operating continuously. All other fans, if additional fans exist, should be off during this time.
4.Add additional refrigerant charge to the receiver as needed until the refrigerant level rises to the center of the sight glass, indicating that the receiver is 80% filled.
When the refrigerant in the receiver reaches the sight glass, the unit is fully charged.
CAUTION
Remove the blockage to the air intake of the condenser.
5. Fill out the applicable sections of the Warranty Registration and
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