Carrier 42QHF012DS Service Manual page 36

10.6 Re-installation while the indoor unit needs to be repaired
1. Collecting the refrigerant into the outdoor unit
Procedure
1). Confirm that both the 2-way and 3-way valves are set to the opened position
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.
3). Air purging of the charge hose.
Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and
then close it quickly.
4). Set the 2-way valve to the close position.
5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
6). Set the 3-way valve to the closed position immediately
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and tighten the 2-way and 3-way valve's stem nuts.
7) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
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