Heat Controller DMC18SB-1 Gas Charging, 48Room Air Conditioner, Troubleshooting Guide, Procedure

Troubleshooting Guide

Gas Charging

(After Evacuation)

Indoor unit Liquid side

Open Outdoor unit

3-Way valve

Gas side

Open

	3-Way
Check valve	valve

Charging cylinder

Lo

(1) OPEN CLOSE

• Procedure

(1)Connect the charge hose to the charging cylinder.

–Connect the charge hose which you dis- connected from the vacuum pump to the valve at the bottom of the cylinder.

–If you are using a gas cylinder, also use a scale and reverse the cylinder so that the system can be charged with liquid.

(2)Purge the air from the charge hose.

–Open the valve at the bottom of the cylin- der and press the check valve on the charge set to purge the air. (Be careful of the liquid refrigerant). The procedure is the same if using a gas cylinder.

(3)Open the valve (Lo side on the charge set and charge the system with liquid refrig- erant.

–If the system can not be charged with the specified amount of refrigerant, it can be charged with a little at a time (approximate- ly 0.33 lb each time) while operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approxi- mately 1 minute and then repeat the pro- cedure (pumping down-pin).

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This is different from previous procedures. Because you are charging with liquid refrigerant from the gas side, absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner.

(4)Immediately disconnect the charge hose from the 3-way valve’s service port.

–Stopping partway will allow the gas to be discharged.

–If the system has been charged with liquid refrigerant while operating the air condi- tioner turn off the air conditioner before disconnecting the hose.

(5)Mount the valve stem nuts and the service port nut.

–Use torque wrench to tighten the service port nut to a torque of 13 lb·ft.

–Be sure to check for gas leakage.

This unit is charged with R-410A.

Pay attention not to charge R-22.

48Room Air Conditioner