Replacing The Outdoor Unit; Evacuation For The Whole System - Heat Controller A-VMH18DC-1 Service Manual

VMH SerieS
Service Manual Heat Controller, Inc.
2-way valve approximately 45° until the gauge indicates 0.3 to 0.5 Mpa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position
Be sure to use a hexagonal wrench to operate the valve stems.
7). Replace the valve stems nuts and the service port cap that were previously removed.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
Be sure to check the gas leakage using soap water.

7.7 Replacing the outdoor unit

1. Evacuation for the whole system

Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the open position.
2). Connect the vacuum pump to 3-way valve's service port.
3). Evacuate for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.
4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge
needle does not move (approximately 5 minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the vacuum pump.
6). Remove the defective outdoor unit and install the new unit. See the following instructions for
re-charging the new unit.
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