Pumping Down - Heat Controller B-MMC09FA-1 Service Manual

2-way, 3-way Valve

(1) Pumping down

Procedure
•
1. Confirm that both the gas side and liquid side
valves are set to the open position.
- Remove the valve stem caps and confirm that the
valve stems are in the raised position.
- Be sure to use a hexagonal wrench to operate
the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then con-
nect the manifold gauge to the service port of the
gas side valve.
- Connect the hose of the gauge with the push pin
to the service port.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.
76 Multi type Air Conditioner
Liquid side
Indoor unit
Gas side
Liquid side
Indoor unit
Gas side
manifold gauge
Low-
handle
Hi- handle
(CLOSE)
(CLOSE)
Outdoor unit
Close
2-Way
valve
Open
3-Way
valve
Close
2-Way
valve
Open
3-Way
valve
6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indicat-
ing 1kg/
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service port
nut.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.(156.2 lbf·in) [4.2kg.m (364.5
- Be sure to check for gas leakage.
g.
lbf·in)/5.5kg.m (477.4 lbf·in)]
g.
2