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506238−01 06/09
TO SUCTION
SERVICE VALVE
HFC−410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
1
2
HIGH
LOW
NITROGEN
NOTE
Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the suction port better protects the manifold
gauge set from high pressure damage.
1. Connect an HFC−410A manifold gauge set high pressure hose to the suction valve service port.
2. With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set.
NOTE Later in the procedure, the HFC−410A container will be replace by the nitrogen container.
3. With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. Open the valve on
the HFC−410A cylinder (suction only).
4. Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A.
[A trace
amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure].
Close the valve on the HFC−410A cylinder and the valve
on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.
5. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
6. Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and
the indoor unit.
7. After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector
.
8. After leak testing disconnect gauges from service ports.
USE REGULATOR TO
FLOW NITROGEN AT 1
TO 2 PSIG.
LEAK TESTING THE SYSTEM
After the line set has been connected to the indoor unit and air conditioner, check the line set connections and indoor unit for leaks. Use
the following procedure to test for leaks:
