mrcool 13seer r410 cond install manual 4web

Unitary Ducted Split AC & HP

port of the manifold gauge set. Open the valve on the HFC−410A cylinder (vapor only).

2). 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.

3). Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the

manifold gauge set.

4). 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.

5). 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.

6). After leak testing disconnect gauges from service ports.

6.5 Evacuating Line Set and Indoor Coil

Fig.15—Evacuating System

6.5.1 Connect Gauge Set

NOTE : Remove cores from service valves (if not already done).

1). Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve

2). Connect high side of manifold gauge set to liquid line service valve

3). Connect micron gauge available connector on the 1/4 SAE in−line tee.

4). Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge

set.

The center port line will be used later for both the HFC−410A and nitrogen containers.

6.5.2 Connect Gauge Set

1). Open both manifold valves and start the vacuum pump.

2). Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01

inches of mercury).

NOTE : During the early stages of evacuation, it is desirable to close the manifold gauge valve

at least once. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak

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