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Charging System Low On Refrigerant
1. To add refrigerant with system running, open the low side hand valve (blue).
2. Start the unit. Verify the unit is in an idle state (it should not be in cooling, heating, reheat, or blower
only modes). Occupied scheduling must be disabled.
3. Navigate to
Service > Test Menu > State > Cool/HP
to activate system test. Once the test is active,
you may monitor and adjust settings.
• Set the compressor to run at maximum speed.
• Adjust condensing fans, and monitor the condensing coil maintains a 110°F temperature.
• Verify reheat voltage is set to 0V.
4. Monitor the system until the following conditions are met:
- Refer to
to determine subcool.
- Compressor must be running at 100%, and condenser fan temperature must be 110°F.
- Subcool should be approximately 10-20°F.
NOTE: Subcool readings will vary based on ambient
and condensing fan temperatures
.
- The superheat reading should be 20°F.
5. Check compressor oil level after a repair. Refer to
“Compressor Information” on page 50
for
compressor models and oil type information.
Removing Manifold Gauge Set
1. Make sure the hand valves are closed.
2. Make sure the refrigerant source is closed / the vacuum pump is not running.
3. Disconnect the high side hose and low side hose from the service valve ports.
4. Install the service port caps. Tighten by hand.
