Data Aire gForce Ultra - 2.9 Humidifier Piping; 2.10 Leak Testing

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2.10 Leak Testing
WARNING: No installation is complete until the entire system has been thor-
oughly checked for leaks. This includes checking the refrigerant tubing, are
ttings, pressure controls, Schrader ttings and compressor rotolock service
valves. Check both the eld and factory connections.
In addition to the refrigeration system, check all condenser water lines, humidier water makeup
lines, condensate lines, condensate pumps, chilled water lines, centrifugal pumps and uid cooler
(where applicable).
When handling or recovering refrigerant it is not permissible to release refrigerant into the atmosphere.
Many leak-test methods recommended in the past are no longer possible. Current standard practices
must be used.
Pressurize the systems circuit(s) to 150 PSIG (1034 kPa) using dry nitrogen with a trace of refrigerant.
Check the entire system for leaks with a suitable leak nder (per local code) including but not limited
to all braze joints, caps, ttings, and are nuts on both eld and factory furnished components. After
completion of leak testing, release test pressure and pull a vacuum on the system.
WARNING: Tightening of ttings and valves is the responsibility of the
installing contractor.
WARNING: With any uid connection there is risk of leakage. Water leak-
age could result in property damage to mission critical equipment. A water
drain connection is required. Units with optional steam generator humidiers
will require an external potable water supply. Water leakage can result from
improper installation and/or practices.
2.11 Evacuation
Moisture prevents the proper operation of both the compressor and the refrigeration system. Air and
moisture reduces service life and increases condensation pressure, which causes abnormally high dis-
charge temperatures that are capable of degrading the lubricating properties of the oil. The risk of acid
formation is also increased by air and moisture, and it this condition can also lead to copper plating. All
of these phenomena may cause both mechanical and electrical compressor failure. The typical method
for avoiding such problems is to evacuate the system.
It is of the utmost importance that proper system evacuation and leak detection procedures be em-
ployed. Good evacuation processes include frequent vacuum pump oil changes and large diameter,
short hose connections to both high and low sides of the system preferably using copper tubing or
braided hose. If the compressor has service valves, they should remain closed. A deep vacuum gauge
capable of registering pressure in microns should be attached to the system for pressure readings. A
shut-o󰀨 valve between the gauge connection and vacuum pump should be provided to allow the sys-
tem pressure to be checked after evacuation. Do not turn o󰀨 vacuum pump when connected to an
evacuated system before closing shut-o󰀨 valve.