30
INSTALL VENT PIPING TO RELIEF VALVES — The
23XRV chiller is factory equipped with relief valves on the
cooler and condenser shells. Refer to Fig. 43 and Table 11 for
size and location of relief devices. Vent relief devices to the
outdoors in accordance with ANSI/ASHRAE 15 (latest
edition) Safety Code for Mechanical Refrigeration and all
other applicable codes.
1. Dual pressure relief valves are mounted on the three-way
valves in some locations to allow testing and repair with-
out transferring the refrigerant charge. Three-way valve
shafts should be turned either fully clockwise or fully
counterclockwise so only one relief valve is exposed to
refrigerant pressure at a time.
The flow area of discharge piping routed from more than
one relief valve, or more than one heat exchanger, must
be greater than the sum of the outlet areas of all relief
valves that are expected to discharge simultaneously. All
relief valves within a machinery room that are exposed to
refrigerant may discharge simultaneously in the event of a
fire. Discharge piping should lead to the point of final
release as directly as possible with consideration of pres-
sure drop in all sections downstream of the relief valves.
2. Provide a pipe plug near outlet side of each relief device
for leak testing. Provide pipe fittings that allow vent
piping to be disconnected periodically for inspection of
valve mechanism.
3. Piping to relief devices must not apply stress to the
device. Adequately support piping. A length of flexible
tubing or piping near the relief device is essential on
spring-isolated machines.
4. Cover the outdoor vent with a rain cap and place a
condensation drain at the low point in the vent piping to
prevent water build-up on the atmospheric side of the
relief device.
Make Electrical Connections — Field wiring must
be installed in accordance with job wiring diagrams and all
applicable electrical codes. Refer to Fig. 44 and 45 for typical
wiring and component layout.
Refrigerant discharged into confined spaces can displace
oxygen and cause asphyxiation.
Only qualified electrical personnel familiar with the con-
struction and operation of this equipment and the hazards
involved should install, adjust, operate, or service this
equipment. Read and understand this manual and other
applicable manuals in their entirety before proceeding.
Failure to observe this precaution could result in severe
bodily injury or loss of life.
COMPRESSOR
OIL
SEPARATOR
CONDENSER
LEAVING
WATER
ENTERING
WATER
VALVE
5
VALVE
4
VALVE
2
CONTROL
PANEL
FRAME
ASSEMBLY
OIL
HEATER
VALVE
3
OIL FILL
FITTING
Fig. 42 — Pumpout Unit
a23-1546
WITH ISOLATION VALVES
WITHOUT ISOLATION VALVES
Fig. 43 — Relief Valve Arrangements
a23-1583
