Make electrical connections – Carrier EVERGREEN HFC-134A User Manual

Page 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

CONTROL

PANEL

FRAME

ASSEMBLY

OIL

HEATER

VALVE

OIL FILL
FITTING

Fig. 42 — Pumpout Unit

a23-1546

WITH ISOLATION VALVES

WITHOUT ISOLATION VALVES

Fig. 43 — Relief Valve Arrangements

a23-1583