Installation, Operation and Maintenance Manual
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2.7.1
Leak Test
NOTICE
No installation is complete until the entire system has been thoroughly
checked for leaks. This includes checking the refrigerant tubing, flare fittings,
pressure controls, Schrader fittings and compressor roto-lock service valves.
Check both the field and factory connections.
In addition to the refrigeration system, check all condenser water lines, humidifier water makeup lines, condensate
lines, condensate pumps, chilled water lines, centrifugal pumps and fluid 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 finder (per local code) including but not limited to all braze joints, caps,
fittings, and flare nuts on both field and factory furnished components. After completion of leak testing release
test pressure and pull a vacuum on the system.
NOTICE
Because fitting may loosen during transit, tightening of fittings and
valves is the responsibility of the installing contractor during the installation
process.
NOTICE
With any fluid connection there is risk of leakage. Water leakage could
result in property damage to mission critical equipment. A water drain
connection is required. Units with optional steam generator humidifiers will
require an external potable water supply. Water leakage can result from
improper installation and/or practices.
System Control Setup
Set the dap4 or Mini-dap4 (or thermostat for ceiling units) to the required site specifications so the unit may operate
properly. Adjust the dap4 settings to the required application design conditions. When making these settings and
adjustments, constantly check whether the system is operating normally (pressure, etc.). See dap4 User Manual
for details.
Post Installation
Before leaving the installation site:
•
Carry out a general installation inspection regarding cleanliness, noise and leak detection.
•
Be sure to observe the applicable law on waste removal when disposing any hazardous materials.
