Carrier HFC-134A installation instructions Pumpout Unit, Relief Valve Arrangements

FRAME

CONTROL ASSEMBLY

PANEL

VALVE

2	VALVE
	3
VALVE	COMPRESSOR
4
	OIL
	HEATER
VALVE
5
ENTERING	OIL FILL
WATER	FITTING

a23-1546LEAVING CONDENSER WATER

OIL

SEPARATOR

Fig. 42 — Pumpout Unit

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.

Refrigerant discharged into confined spaces can displace oxygen and cause asphyxiation.

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.

WITH ISOLATION VALVES

a23-1583 WITHOUT ISOLATION VALVES

Fig. 43 — Relief Valve Arrangements

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.

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.

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