104
Monitoring with Gauge Set
1. Close the high side hand valve (red) and low side hand valve (blue).
2. Connect vacuum rated manifold service hoses, refer to
• Red service hose to the high side service port.
• Blue service hose to the low side service port.
• Verify the yellow service hose is capped when not connected to a refrigerant tank, recovery tank, or
vacuum pump.
3. Connect a standard pressure gauge set to the service port located on the leaving side of the outdoor
4. Start the system.
5. If the service hoses have a manual turn valve, open the valve. Monitor the following:
• The low side and high side gauges.
• The superheat reading should be 20°F.
6. 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
.
7. Determining the readings:
- If the readings are correct, close the gauge set and shut down the system. Disconnect the gauge
set, refer to
“Removing Manifold Gauge Set” on page 107
- If the readings are incorrect, follow the
“System Troubleshooting Chart” on page 108
and repair the problem.
Recovering Refrigerant from the System
1. Connect vacuum rated manifold service hoses, refer to
• Red service hose to the high side service port.
• Blue service hose to the low side service port.
• Connect the yellow service hose to the inlet port of the recovery machine.
• Connect a hose from the discharge port of the recovery machine to the recovery tank.
2. Purge all hoses of non-condensables before starting the system.
3. Place the system in ‘Evacuation Mode’. Enter HMI menu function by pressing the top two buttons
simultaneously. Navigate to
Service > Test Menu > Evacuation Mode > Enable
.
4. When the system is in ‘Evacuation mode’, the EEV and reheat valve (if applicable) will open and allow
full access to the system via the high and low side service ports. Ensure the compressor does not run
by pressing ‘OFF/Reset’ on the compressor VFD HMI.
5. Open the connected valve on the recovery tank.
6. Turn the recovery unit on.
7. Open the low side and high side hand valves.
8. Monitor the gauge set until all refrigerant has been recovered and the system is under a proper
vacuum.
