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Quest 185 Cool
Installation, Operation and Maintenance Instructions
13
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5.5 Leak Test Line Set and Dehumidifier
Manifold Gage Set
When checking the system charge, use a manifold gage set that features low loss anti-blow back fittings. Manifold
gage set used with HFC-410A refrigerant systems must be capable of handling the higher system operating
pressures. The gages should be rated for use with high side operating pressures of 0 – 800 psig and low side
operating pressures of 30 inches of vacuum to 250 psig. Dampened gages or anti-flutter gages are recommended.
Gage hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.
CAUTION!
The environmental protection agency (EPA) prohibits the intentional venting of HFC refrigerants
during maintenance, service, repair and disposal of appliance. Approved methods of recovery,
recycling or reclaiming must be followed.
WARNING!
When using a high pressure gas such as dry nitrogen to pressurize refrigeration or air conditioning
system, use a regulator that can control the pressure down to 1 or 2 PSIG.
CAUTION!
Leak detector must be capable of sensing HFC refrigerant.
WARNING!
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
1. Connect the HFC-410A manifold gage set high pressure hose to the service port on the suction gas line.
Note:
Connecting the high pressure hose to the service port
on the gas line will protect the manifold gage set from
high pressure damage during leak testing. Cap liquid line
service port.
2. Make sure all of the valves on the manifold gage set are
closed. Connect a cylinder of HFC-410A refrigerant to
the center port of the manifold gage set.
3. Position the HFC410A refrigerant cylinder to deliver
vapor only. Open the valve on the HFC-410A
refrigerant cylinder.
4. Open the high pressure side of the manifold gage set to
allow HFC-410A into the line set and dehumidifier.
Weigh in a trace amount of HFC-410A [A trace
amount is a maximum of two ounces (57g) of
refrigerant or 3 PSI]. Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold
gage set.
5. Disconnect the HFC-410A refrigerant cylinder from the manifold gage set.
6. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gage set.
LOW
HIGH
MANIFOLD GAUGE SET
NITROGEN
HFC-410A
TO VAPOR
SERVICE
VALVE
OUTDOOR UNIT
