Gas Charging (After Repair) - Friedrich Floating Air Pro Multi-Zone FPHMR42A3A Service Manual

R-410A SEALED SYSTEM REPAIR

Gas Charging (After Repair)

– 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.
– Open the valve at the bottom of the cylinder and press the
check valve on the charge set to purge the air. (Be careful of
the liquid refrigerant).
- 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.
208
Indoor unit
Gas side
Lo
OPEN CLOSE
Liquid side
3-Way
valve
Open
3-Way
valve
Open
This is di erent 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.
– Stopping partway will allow the gas to be discharged.
– If the system has been charged with liquid refrigerant while
operating the air conditioner turn o the air conditioner before
disconnecting the hose.
– Tighten the service port nut.
– Be sure to check for gas leakage.
Outdoor unit