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Uni-P H20 200C DEHUMIDIFIER
Leak Test the Dehumidifier and the Line Set
The Manifold Set
During the process of checking the system charge, you can make use of the manifold gage, which
features low loss of anti-blowback fittings. The manifold gage that is used with the HFC-410A
refrigerant should be able to handle the higher system operating pressures. In general, the gages
should be rated for utility with the high side operating pressure of about 0 to 800 psig, and the low side
operating pressure of thirty inches of the vacuum to 250 psig. Anti-flutter gages and damper gages are
often recommended. The gage hose, on the other hand, should be rated for use of up to 800 psig of
pressure together with an average burst rating of 4000 psig.
Caution:
The EPA (Environmental Protection Agency) prohibits the deliberate venting of HFC refrigeration
during the disposal, repair, service, and maintenance of appliances. The approved methods of
reclaiming, recycling or recovery should be observed.
Warning:
In a case where you are using a high-pressure gas like dry nitrogen to pressurize air conditioning or
refrigeration, it is recommended that you make use of a regulator that can perfectly control the
pressure down to one or two PSIG.
Caution:
The leak detector should be able to sense the HFC refrigerant.
Warning:
The refrigerant gas may be harmful if inhaled. For that reason, the refrigerant must be recovered and
used responsibly. Failure to observe this aspect may result in death or serious bodily injuries.
When it comes to leak-testing the procedure highlighted
below can be of great importance:
Connect the manifold HFC-410A gage set for the high-pressure hose to the
suction gas line using the service port. By connecting the high-pressure hose to
the gas line via the service port you will help to protect the manifold gage from
the negative effects of high pressure during the leak testing process. Ensure
that you cap the liquid line present on the manifold gage service port.
Tel: 888-990-7469
Installation, Operation & Service Instructions
6
Uni-P H20 200C DEHUMIDIFIER
Ensure that all valves present of the manifold gage on the outdoor unit are closed. Connect an
HFC-410A refrigerant cylinder to the center port present on the manifold gage set.
Position the cylinder of the HFC-410A refrigerant in such a way that it delivers vapor only. Open
the valves on the refrigerant and ensure that the HFC-410A amount is at a maximum of 57g
(two ounces) of refrigerant or at maximum 3PSI. Close the valve on the cylinder of HFC-410A
and the valve present on the high-pressure manifold gage set.
Make sure that you disconnect the cylinder of the refrigerant from the manifold gage set.
Next, connect the cylinder of inert gas (dry nitrogen) using a pressure regulating valve to the
middle port of the manifold set.
Adjust the inert gas (dry nitrogen) pressure regulator to averagely 150 psig. Then open the
valve on the side of the manifold gage to pressurize the dehumidifier and line set.
Ensure that you close up the valve on the inert gas cylinder. Then close the valve present on
the high-pressure side of the manifold set.
Give the system some time to rest.
Check all threaded and brazed joints for any possibilities of leaks using the leak detector
designed to sense the HFC refrigerants.
After you complete the leak testing process, you may disconnect the inert gas cylinder from the
middle port of the manifold gauge and also disconnect the high-pressure hose present on the
manifold gage from the suction gas line service port.
Evacuating the Dehumidifier and the Line Set
First of all, remove the valves from the service ports on the gas and liquid line stubs using the no-
loss valve core removal gadgets.
Connect a quarter feet SAE in-line tee unto the gas stub valve core removal
port.
Next, connect the manifold gage set low-pressure side to one of the ports present on the quarter
feet SAE in-line tee.
Forth, connect the micron gage set to the remaining port of the SAE in-line tee.Connect
the manifold gage set high-pressure side to the gas and liquid line stub service port.
Next, connect a vacuum pump to the middle port of the manifold gage set.
Then open the valve core removal tools.
Ensure that you open the low and high-pressure manifold gage set side and
kick-start the vacuum pump.
After you evacuate for several minutes, close up the low and high-pressure sides of the
manifold gage and check out the behavior of the entire micron gage. In a case where
there is a rapid increase in pressure reading of the micron gage, it is evident that there
are leaks in the system. In a case where this condition occurs, you may check the valve
core removal tools, tee, hoses, and manifold gage set for the presence of leaks. It there is
no leak found, ensure that you repeat the leak test process.
7
Installation, Operation & Service Instructions
Tel: 888-990-7469
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