KIRLOSKAR KAC - Adjusting the Refrigerant Charge; Pressure Testing after Service or Repair or Major Leak

KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 36
c) Then start the compressor and complete the refrigerant charge.
d) Check the moisture and liquid indicator, it should show the bubble free liquid refrigerant flow,
also check the refrigerant vapor suction super-heat and liquid refrigerant sub-cool temperature
details for concluding the correct charge of refrigerant.
NOTE: DO NOT DISCHARGE THE REFRIGERANT INTO THE ATMOSPHERE.
To recover it, use empty, clean and dry cylinders OR refrigerant storage vessel. The liquid
refrigerant recovery can be performed with the help of the valve provided on the liquid line. To
facilitate the recovery of refrigerant, place the receiver / cylinder inside a container full of ice.
Weigh the bottle frequently to avoid excessive filling of the containers (70 ~ 80% max by
volume can be stored in the containers). If it is necessary to top-up the refrigerant follow the
same procedure. Before toping-up the refrigerant, find out and attend the cause of refrigerant
loss.
4.2.5.2. Adjusting the Refrigerant Charge
If it becomes necessary to adjust the refrigerant charge to obtain optimum chiller performance,
operate the chiller at design load and then add or remove refrigerant slowly until the refrigeration
parameters reaches design conditions. DO NOT OVERCHARGE. Refrigerant may be added
either through the storage vessel OR directly into the chiller.
4.2.5.3. Pressure Testing After Service or Repair or Major Leak
After attending the repair, the chiller OR equipment OR part of the equipment must be
pressurized and leak tested. Pressurize the system with dry nitrogen and use a soap solution to
determine if leaks are present. The leak test has to be performed only after evacuating the
complete refrigerant from the part OR equipment OR chiller.
IMPORTANT: WHILE CHARGING R410A IN THE CHILLER
ALWAYS CHARGE IN LIQUID FORM IN LIQUID LINE BY
INVERTING THE CYLINDER. CHARING IN VAPOUR FORM WILL
NOT GIVE THE DESIRED PERFORMANCE.
BEFORE MAKING ANY NECESSARY REPAIRS TO A
LEAK, TRANSFER ALL REFRIGERANT FROM THE
LEAKING VESSEL.