ClimaCool SHC onDEMAND 30, 50, 70, 85 Manual - Manual (Page 39)

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WARNING
To avoid the release of refrigerant into the atmosphere, the refrigerant
circuit of this unit must be serviced only by technicians who meet local,
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All refrigerant discharged from this unit must be recovered WITHOUT
EXCEPTION. Technicians must follow industry accepted guidelines and
all local, state and federal statutes for the recovery and disposal
of refrigerants.
If a compressor is removed from this unit, system refrigerant circuit oil
will remain in the compressor. To avoid leakage of compressor oil, the
refrigerant lines of the compressor must be sealed after it is removed.
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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
• American National Standard Code for Pressure Piping,
ANSI B31.5
Factory Tested
ClimaCool modular chillers have been pressure-tested,
evacuated, fully charged and run tested at design water
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a refrigerant leak is detected at startup, the following
guidelines should be consulted before reprocessing the
refrigeration systems.
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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
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system with low pressure dry nitrogen while brazing to
prevent oxidation inside the copper piping.
After all of the repairs have been made to the refrigeration
system, a pressure test using refrigerant and nitrogen
should be performed. Pressurize the system with dry
nitrogen to 20 psi and check for any obvious leaks. If no
leaks are present introduce a “trace” amount of refrigerant
to the system (raise system pressure to 30-40 psi). With a
dry nitrogen tank equipped with a regulator set to 150 psi,
continue to pressurize the system to 150 psi. Using a leak
detector, carefully check the system for any remaining leaks.
If the system is free of leaks, you may release the pressure.
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‹•‹ƒ˜ƒ ——ǤThis 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
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 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. The evacuation
process is considered complete ONLY after a successful
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Dz„ŽƒǦ‘ơdz–‡•–‹•†‡Ƥ‡†ƒ•ǣ
• Pulling a vacuum level less than 500 microns on
thesystem and holding it for several hours.
• Record the vacuum level in the system in microns,
–Š‡ Ž‘•‡‘ơ–Š‡˜ƒ ——’—’ˆ”‘–Š‡•›•–‡ˆ‘”
15 minutes, and continue to monitor the micron level
inside the refrigeration system.
• If the vacuum level inside the system does NOT rise
more than 400 microns above the recorded vacuum
level at the start of the 15 minute period, then the
evacuation process is complete.
If the vacuum level rises more than 400 microns in 15
minutes, then continue to evacuate the system for 1-2 hours,
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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 gauge 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
•‹†‡‘ˆ–Š‡•›•–‡Ƥ”•–ǡ—–‹Ž‘ƒ††‹–‹‘ƒŽ”‡ˆ”‹‰‡”ƒ– ƒ
be dispensed. Accurate refrigerant charge per circuit may
be found in the Physical Data information on page 4. Then
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of the system with refrigerant. Close the refrigerant cylinder
charging port, close all gauge 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.