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Quest 185 Cool
Installation, Operation and Maintenance Instructions
14
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7. Adjust the dry nitrogen pressure regulator to 150 psig. Open the valve on the high pressure side of the manifold gage set
to pressurize the line set and dehumidifier.
8. Close the valve on the dry nitrogen cylinder. Close the valve on the high pressure side of the manifold gage set.
9. Allow the system to rest for a few minutes.
10. Check all (brazed and threaded) joints for leaks using a leak detector designed to sense HFC refrigerants.
11. After leak testing is complete, disconnect the dry nitrogen cylinder from the center port of the manifold gage set and
disconnect the high pressure hose of the manifold gage set from the suction gas line service port.
5.6 Evacuating the Line Set and The Dehumidifier
1. Remove the valve cores from the service ports on the liquid and gas line stubs using no-loss valve core removal
tools.
2. Connect a 1/4” SAE in-line tee to the gas line stub valve core removal tool.
3. Connect the low pressure side of the manifold gage set to one of the ports on the 1/4” SAE in-line tee.
4. Connect a micron gage to the remaining port of the 1/4” SAE in-line tee.
5. Connect the high pressure side of the manifold gage set to the liquid line stub service port.
6. Connect a vacuum pump to the center port on the manifold gage set.
7. Open the valve core removal tool valves.
8. Open the high and low pressure sides of the manifold gage set and start the vacuum pump.
9. After evacuating for a few minutes, close the high and low pressure sides of the manifold gage set and observe the
behavior of the micron gage. A rapid rise in the micron gage reading (pressure) indicates a leak in the system. If this
occurs, check the manifold gage set, hoses, tee, and valve core removal tools for leaks. If no leak is found, repeat the
leak test procedure on Page 15.
10. Evacuate the line set and dehumidifier for a minimum of 15 minutes and check that the micron gauge reads
below 500 microns.
11. Close the low and high pressure sides of the manifold gage set and stop the vacuum pump.
12. Wait 10 minutes.
13. If the micron gage reading rises above 800 microns, check for leaks and return to step 9.
14. If the micron gage reading remains below 800, close the valves on the valve core removal tools.
15. Remove the tee from the gas line stub valve core removal tool. Connect the low pressure side of the manifold
gage set to the gas line stub valve core removal tool.
16. Install the valve core into the liquid line stub service port.
17. Remove the vacuum pump from the center port of the manifold gage set and proceed to the next section to
charge the system.
