KIRLOSKAR KAC - Liquid Refrigerant Drier Replacement; Refrigerants; Vacuum; Dehydration Procedure

KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 34
4.2.2. Liquid Refrigerant Filter Drier Replacement
KAC units are equipped with high capacity replaceable filter drier in liquid line. The purpose of
the filter drier is to keep the refrigeration circuit clean of solid contaminants, water and acid.
Contamination can cause corrosion and ice building as well as malfunction of the unit. The filter
drier cartridge is specially made out of Molecular sieves and Activated alumina. To change the
filter drier follow the procedure given below:
i) Isolate the filter drier by closing ball valve and 100% closing EEV
ii) Drain out the liquid refrigerant available in the filter drier area.
iii) Gradually reduce the pressure to 0.0 kg /cm2(g).
iv) Open solder joint and braze new filter drier.
v) For injection line, replace the existing drier with the new drier. Use wet clothe on both side to
avoid heat dissipation.
vi) Vacuum the isolated line. Break the vacuum with refrigerant and connect the filter drier
assembly to the system.
4.2.3. Refrigerants
Kirloskar Chillers make KAC units are designed to work with refrigerant R-410A. All units shall
be shipped factory charged. For details of approximate refrigerant charge, refer the design data
sheet. In case, if moisture is noticed in the system, remove the refrigerant from the system,
evacuate the system and charge the refrigerant through the high capacity filter drier cores to
eliminate cause of trouble. Contact Kirloskar Chillers for further details.
4.2.4. Vacuum/ Dehydration Procedure
After performing leak test, the chiller OR part OR equipment shall be subjected to vacuum and
dehydration
1. Triple vacuum method is recommended.
2. Use vacuum pump of capacity approximately 0.5 cu.ft/min  2 cu.ft/min.
A suitable calibrated vacuum micron gauge OR a mercury manometer shall be connected to the
system. For vacuuming, follow the steps given hereunder:
1. Evacuate the system to a pressure of 500 μm Hg( 0.5 mm of Hg) /(0.67 mbar) absolute.