DA Data Cool Series Installation, Operation And Maintanance Manual - page 12
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2.5
Humidifier Piping
The optional humidifier offered on Data Cool is a steam generator type with a disposable cylinder. The
humidifier makeup water should be brought to the humidifier through the field connection opening using
1/4" copper tubing. A compression fitting is provided at the humidifier. A shutoff valve should be provided
outside the air conditioner to allow disconnection for service. An in-line water pressure regulator and
strainer should be installed. Water pressure should be set between 30 and 50 PSI.
The humidifier has a drain at the bottom which is factory piped to the main condensate drain line. The
dispersion tube also has a drain line. No additional field piping is required.
2.6
Leak Testing
No installation is complete until the entire system has been thoroughly checked for leaks. This includes
checking refrigerant tubing, flare fittings, pressure controls, shrader fittings and compressor rotolock
service valves.
In addition to the refrigeration system, check all condensate lines, humidifier makeup lines, condensate
lines, condensate pumps, chilled water lines, centrifugal pumps and fluid coolers as applicable.
When handling and 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.
One acceptable method of leak testing air cooled systems does not involve the use of refrigerant. Prior
to charging, pressurize the system to 150 psi with dry nitrogen with all refrigerant valves open. Place a
gauge on the line and allow at least four hours before observing if the pressure reading has changed.
Tightening of fittings and valves is the responsibility of the installing contractor.
2.7
Evacuation
It is of the utmost importance that proper system evacuation and leak detection procedures be employed.
Data Aire recommends a minimum evacuation to 500 microns. 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 bronze 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-off valve between the gauge
connection and vacuum pump should be provided to allow the system pressure to be checked after
evacuation. Do not turn off vacuum pump when connected to an evacuated system before closing shut-
off valve.
Do not apply power to the compressor when in a vacuum.