Heat Controller DMH12SB-0, DMC18SB-1, DMC12SB-0 Evacuation, Finishing the job, Installation

Installation

	Soap water method
		the gas side and liquid side	Suction Line
(1) Remove the caps from
	valves.

(2)Remove the service-port cap from the gas side valve.

(3)	To open the gas side valve turn the valve stem
	counterclockwise approximately 90°, wait for about	Evaporator Line
	2~3 seconds, and close it.	3-way valve
(4)	Apply a soap water or a liquid neutral detergent on
		(Close)
	the indoor unit connection or outdoor unit connec-
	tions by a soft brush to check for leakage of the con-	3-way valve
	necting points of the piping.	(Open)

(5) If bubbles come out, the pipes have leakage.

Evacuation Cap

• Connect the charge hose end described in the			Hexagonal wrench
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.				Indoor unit
The operation time for evacuation varies with tub-
ing length and capacity of the pump. The follow-
ing table shows the time required for evacuation.
Required time for evacuation when 4 CMF vacu-
um pump is used
If tubing length is less	if tubing length is longer
than 10m (33 ft)	than 10m (33 ft)
10 min. or more	15 min. or more			Outdoor unit
• When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the vac-
uum pump.
Finishing the job
• With a service valve wrench, turn the valve stem
of liquid side valve counter-clockwise to fully		Manifold valve
open the valve.
• Turn the valve stem of gas side valve counter-		Pressure	Lo	Hi
clockwise to fully open the valve.		gauge
• Loosen the charge hose connected to the gas
side service port slightly to release the pressure,		Open		Close
then remove the hose.
• Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut securely
with an adjustable wrench. This process is very
important to prevent leakage from the system.
• Replace the valve caps at both gas and liquid		Vacuum pump
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
				Service Manual	31