www.DaikinApplied.com 13 IOM 1281-2 • CENTRIFUGAL WATER CHILLERS
Relief Valves
As a safety precaution and to meet code requirements, each
chiller is equipped with pressure relief valves located on
the condenser and evaporator for the purpose of relieving
excessive refrigerant pressure (caused by equipment
Table 3: WDC, WCC A Vintage Relief Valve Data
Evaporator Condenser
Location Top Top Top
Setting (psi) 200 225 200
Discharge Capacity
(lb/min air)
75.5 84.4 5
Qty
2 for 16’ shells
2 for 20’ shells
4 for 16’
shells
4 for 20’
shells
1 for
079-126
models
Connection Size 1.0-inch NPT
3/8-inch
NPT
Most codes require that relief valves be vented to the outside
of a building. Relief piping connections to the relief valves must
CAUTION
Units are shipped with refrigerant valves closed to isolate the
refrigerant in the unit condenser. Valves must remain closed
until startup by the factory service technician.
Remove plastic shipping plugs (if installed) from the inside of
the valves prior to making pipe connections. Whenever vent
piping is installed, the lines must be in accordance with local
code requirements; where local codes do not apply, the latest
issue of ANSI/ASHRAE Standard 15 code recommendations
must be followed.
Condenser Relief Valves
In order to ensure proper installation, it is important to know
how the three-way relief valve functions. One valve remains
active at all times and the second valve acts as a standby.
When the stem of the three-way valve is pushed into the
in Figure 6. When the stem of the three-way valve is pulled
Figure 7.
Figure 6: Condenser Three-Way Relief Valve
Figure 7: Three-Way Valve, Front Seated Position Three
Way Valve, Back Seated Position
Three-Way Valve
Relief Valves
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