Friedrich MW12C1H, MW09C1H, MR09C1H, MR12C1H manual Procedure

Troubleshooting
Indoor unit	Liquid side
	Clsed	Outdoor unit
	2-way
	valve
	Gas side
	Clsed
	3-way
	valve
Vacuum pump
	Lo
OPEN	CLOSE

* Procedure

(1)Connect the charge hose from the manifold valve to the ser- vice port of the gas side packed valve.

(2)Connect the charge hose to the port of the vacuum pump.

(3)Open fully the low pressure side handle of the gauge mani- fold valve.

(4)Operate the vacuum pump to begin evacuating. Perform evacuating for about 15 minutes if the piping length is 20 meters (15 minutes for 20 meters) (assuming a pump capacity of 27 liters per minute). Confirm that the compound pressure gauge reading is –101 kPa (–76 cmHg).

(5)Close the low pressure valve handle of gauge manifold.

– Check the flare connections for gas leakage.

(6)Use torque wrench to tighten the service port nut to a torque of 1.8kg.cm.

(7)Set the 3-way valve to the back seat.

(8)Mount the valve stem nuts to the 2-way and 3-way valves.

(9)Check for gas leakage.

–At this time, especially check for gas leakage from the 2-way and 3-way valve’s stem nuts, and from the service port nut.

CAUTION:

If gas leakage are discovered in step 5 above, take the following mesures :

If the gas leaks stop when the piping connections are tightened further, continue working from step 6. If the gas leaks do not stop when the connections are retightened, repair the location of the leak, discharge all of the gas through the service port, and then recharge with the specified amount of gas from a gas cylinder.

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