Carrier HFC-134A installation instructions A23-1537, A23-1580

5.Remove jacking screws from leveling pads after grout has hardened.

INSTALL SPRING ISOLATION

IMPORTANT: Accessory spring isolation packages are intended solely for non-seismic applications. Seis- mic applications must be designed by a registered professional in accordance with all applicable national and local codes.

Spring isolation may be purchased as an accessory from Carrier for field installation. It may also be field supplied and installed. Spring isolators may be placed directly under machine support plates or located under machine soleplates. See Fig. 34. Consult job data for specific arrangement. Low profile spring isolation assemblies can be field supplied to keep the machine at a convenient working height.

Obtain specific details on spring mounting and machine weight distribution from job data. Also, check job data for methods to support and isolate pipes that are attached to spring isolated machines.

a23-1537

NOTE: The accessory spring isolators are supplied by Carrier for installation in the field.

Fig. 34 — 23XRV Accessory Spring Isolation

(Shown with Accessory Soleplates)

Connect Piping

IMPORTANT: Chiller water nozzle connections to be designed by others in accordance with all applicable national and local codes.

Remove cooler and condenser liquid temperature and optional pressure sensors before welding connecting piping to water nozzles. Refer to Fig. 15. Replace sensors after welding is complete.

INSTALL WATER PIPING TO HEAT EXCHANGERS — Refer to Table 4 for nozzle sizes. Install piping using job data, piping drawings, and procedures outlined below. A typical piping installation is shown in Fig. 35.

THERMOMETER	PIPE	LEAVING
	FLANGES
		CONDENSER
OPENING
		WATER
(OPTIONAL)
		ENTERING
		CONDENSER
		WATER

		PRESSURE
AIR VENT		GAGES
PIPE HANGERS		ENTERING CHILLED
a23-1580	LEAVING CHILLED	WATER
	WATER

Fig. 35 — Typical Nozzle Piping

Factory-supplied insulation is not flammable but can be damaged by welding sparks and open flame. Protect insu- lation with a wet canvas cover.

1.Offset pipe flanges to permit removal of waterbox cover for maintenance and to provide clearance for pipe clean- ing. No flanges are necessary with marine waterbox option; however, water piping should not cross in front of the waterbox cover or access will be blocked.

2.Provide openings in water piping for required pressure gages and thermometers. For thorough mixing and temperature stabilization, wells in the leaving water pipe should extend inside pipe at least 2 in. (51 mm).

3.Install air vents at all high points in piping to remove air and prevent water hammer.

4.Install pipe hangers where needed. Make sure no weight or stress is placed on waterbox nozzles or flanges.

5.Water flow direction must be as specified in Fig. 36 and 37.

NOTE: Entering water is always the lower of the 2 noz- zles. Leaving water is always the upper nozzle for cooler or condenser.

6.Install waterbox vent and drain piping in accordance with individual job data. All connections are 3/4-in. FPT.

7.Install waterbox drain plugs in the unused waterbox drains and vent openings.

8.Install optional pumpout system or pumpout system and storage tank as shown in Fig. 38-42.

Never charge liquid 134a refrigerant into the chiller if the pressure is less than 35 psig (241 kPa). Charge as a gas only, with the cooler and condenser pumps running, until 35 psig (241 kPa) is reached using a pumpdown. Terminate the pumpdown mode using the ICVC. Flashing of liquid refrigerant at low pressures can cause tube freeze-up and considerable damage.

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