ClimaCool IOM FLEX SERIES - Manual (Page 38)

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and sustained for several hours in order for the system to
be considered free from moisture. It is necessary to use a
micron meter equipped with an absolute pressure gauge (or
transducer) to take this reading. ClimaCool recommends
the double evacuation process to ensure the proper removal
of moisture and contaminants from the refrigeration system.
After the initial vacuum is reached and held on the system,
allow dry nitrogen back into the system until the pressure
reaches zero PSIG or slightly higher. Then, repeat the entire
evacuation process described above.
Recharging the System
After all repairs have been completed, the system has been
leak tested, and proper vacuum pressures have been reached
and maintained, refrigerant may be recharged into the system.
With a known weight of refrigerant in the cylinder, use the
gage manifold set to connect the cylinder's liquid charging
port to the charging access port near the refrigerant liquid line
valve. Open the compressor suction and discharge line valves.
Gradually meter the appropriate weight of liquid refrigerant
into the condenser side of the system first, until no additional
refrigerant can be dispensed. Then continue the charging
process by filling the evaporator side of the system with
refrigerant. Close the refrigerant cylinder charging port, close
all gage manifold ports and start the compressor. Be careful
when continuing to charge the balance of the refrigerant,
constantly maintaining a positive compressor suction pressure
(> 25 PSIG) at all times.
Refrigeration System Re-Processing
REFRIGERATION SYSTEM RE-PROCESSING
Conforming to local and national codes is the responsibility
of the service technician or installing contractor. The service
technician should be familiar with the following codes:
ASHRAE Standard Safety Code for Mechanical
Refrigeration, ANSI/ASHRAE 15-1978.
American National Standard Code for Pressure Piping, ANSI
B31.5-1974.
Factory Tested
ClimaCool modular chillers have been leak tested, fully
charged and factory run-tested before shipment. In the
unlikely event that a refrigerant leak is detected at start-
up, the following guidelines should be consulted before
reprocessing the refrigeration systems.
Refrigerant System Reprocessing
Debris and moisture can enter copper tubing in a matter of
minutes. All tubing, coil connections, or any refrigerant
containing portions should be temporarily capped or sealed
to keep contaminants to a minimum. Filter driers should
be opened just prior to brazing into the system to prevent
moisture infiltration whenever possible.
After all of the repairs have been made to the refrigeration
system, a pressure test using refrigerant and dry nitrogen
should be taken. Connect the refrigerant cylinder to the
charging port of the condenser liquid stop valve and bleed
in enough gas to raise the system pressure up to 25 PSI. If
no obvious leaks are present you may proceed. Using a dry
nitrogen supply tank equipped with a pressure regulator set at
150 PSI, continue to raise the pressure up to 150 PSI. Using
a leak detector, carefully check the system for any remaining
leaks. If the system is leak free you may release the pressure.
Evacuating the System
The compressors should never be run while the system is
in a vacuum. This could cause immediate failure to the
compressors. After the system has been leak tested and
sealed, any moisture that entered the system should be
dehydrated and removed. While the pressure is reduced
under a vacuum, the boiling point of moisture trapped
inside the lines is reduced also. A pressure of .0095 PSIA,
or 500 microns absolute pressure or better must be reached
NOTES: Modules are all pre-charged at factory and ready for field
connections. FLEX Modules are refrigerant flexible.