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38MGRBQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
A220024
Fig. 26 —Manifold Sizes 24-48
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gauge capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water (see Fig. 27).
A220025
Fig. 27 —Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation is the recommended method of dehydration.
Refer to Fig. and proceed as follows:
1. Pump the system down to 1500 microns and allow the pump to
continue operating for an additional 15 minutes.
2. Close the service valves and shut off the vacuum pump.
3. Connect a dry nitrogen cylinder and regulator to the system and
break vacuum until the system reaches 2 psig.
4. Close the service valve and allow the system to stand for 1 hr.
During this time, the dry nitrogen can diffuse throughout the system
absorbing moisture.
5. Pump the system down to 1000 microns.
6. Break the vacuum with dry nitrogen (2 psig).
7. Pump the system down to 500 microns.
8. Perform the hold test for 30 minutes.
A220026
Fig. 28 —Triple Evacuation Method
Final Tubing Check
IMPORTANT: Ensure the factory tubing on both the indoor
and outdoor unit has not shifted during shipment. Ensure
tubes are not rubbing against each other or any sheet metal.
Pay close attention to feeder tubes, making sure wire ties on
the feeder tubes are secure and tight.
START-UP
TEST OPERATION
Perform a test operation after completing a gas leak and electrical
safety check. Review the indoor unit installation instructions and
owner’s manual for additional start up information.
System Checks
1. Conceal the tubing where possible.
2. Ensure the drain tube slopes downward along its entire length.
3. Ensure all tubing and connections are properly insulated.
4. Fasten the tubes to the outside wall, when possible.
5. Seal the hole through which the cables and tubing pass.
OUTDOOR UNIT
1. Are there unusual noises or vibrations during operation?
Explain the Following Items to the Customer (with the
aid of the Owner’s Manual):
2. Explain care and maintenance.
3. Present the installation instructions to the customer.
DO NOT apply power to the outdoor unit if the Master
Service Valves are not fully open. Compressor damage will
occur.
CAUTION
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