Friedrich MRM09Y1J, Service & Parts Manual

Page: 74 / 135

74 PB
R-410A SEALED SYSTEM REPAIR
Gas Charging (After Repair)
– Open the valve at the bottom of the cylinder and press the
– 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.
check valve on the charge set to purge the air. (Be careful of
the liquid refrigerant).
–
– Stopping partway will allow the gas to be discharged.
If the system has been charged with liquid refrigerant while
operating the air conditioner turn off the air conditioner before
disconnecting the hose.
– Tighten the service port nut.
– Be sure to check for gas leakage.
Lo
Open
Open
3-Way
valve
Gas side
CLOSE
3-Way
valve
OPEN
Outdoor unit
Liquid side
Indoor unit
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.
- Weigh in the refrigerant amount listed on the rating plate, adding
additional refrigerant as needed for long line set length.
- If the temperature does not allow full liquid charge, run the system
in air conditioning and throttle refrigerant in at 0.2 oz/min. Allow the
system pressure to stabilize each time.