the chilled and condenser water circuits, operate the pumps manually and carefully check the
evaporator and condenser water heads and piping for leaks. Repair leaks as necessary.
Before initial operation of the unit both water circuits should be thoroughly vented of all air at the
high points.
Refrigerant relief piping
Each unit is equipped with pressure relief valves located on the condenser and on the evaporator
for the purpose of quickly relieving excess pressure of the refrigerant charge to the atmosphere as
a safety precaution in case of an emergency, such as fire.
Refrigerant relief vent piping (by others), from the relief valves to the outside of the building, is
required by code in most areas and should be installed on all chillers. The vent line should be
sized in accordance with the ANSI/ASHRAE-15, or local code. The vent line must include a trap in
the vertical leg to capture any vent stack condensation, intercept dirt, and permit cleaning out.
The piping MUST be arranged to avoid strain on the relief valves, using a flexible connection, if
necessary.
Figure 22: Typical refrigerant vent piping
Item Description
A Horizontal misaligned
B Vertical offset
C Compressed
Note:
• When installing relief piping there must not be any piping strain. Relief piping must be
properly aligned and supported to eliminate any possible piping strain.
• When installing relief piping on ANSI flange, a piping union must be used to make a
serviceable piping connection.
Centrifugal Liquid Chillers40
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