Carrier HFC-134A installation instructions 23XRV with Unit-Mounted VFD/Control Center, A23-1594

1

6

TO CHILLED WATER PUMP TO CONDENSER WATER PUMP TO COOLING TOWER FAN

9

TO

COOLING

TOWER

MAIN COMPRESSOR

MOTOR POWER

1 1 1

8

2

9

	3
FROM	SEE NOTE 4
COOLING
TOWER	FROM
	LOAD
	TO
	LOAD
5	DRAIN
	4

a23-1594

LEGEND

1— Disconnect (Fused on VFD only) NOT by Carrier

2— Unit Mounted VFD/Control Center

3— Pressure Gages

4— Chilled Water Pump

5— Condenser Water Pump

6— Chilled Water Pump Starter

7— Condensing Water Pump Starter

8— Cooling Tower Fan Starter

9— Vents

Piping

Control Wiring

Power Wiring

IMPORTANT: Wiring and piping shown are for general point-of- connection only and are not intended to show details for a specific installation. Certified field wiring and dimensional diagrams are avail- able on request.

NOTES:

1.All wiring must comply with applicable codes.

2.Refer to Carrier System Design Manual for details regarding piping techniques.

3.Wiring not shown for optional devices such as:

•remote start-stop

•remote alarm

•optional safety device

•4 to 20 mA (1 to 5 VDC) resets

•optional remote sensors

•kW output

•head pressure reference

4.Service clearance under the chiller can be enhanced if the grout is not extended along the entire length of the heat exchangers.

5.Carrier does not recommend pre-fab water piping.

6.Field-installed piping must be arranged and supported to avoid stress on the equipment and transmission of vibrations from the equipment as well as to prevent interference with routine access for the reading, adjusting and servicing of the equipment. Provisions shall be made for adjustment in each plane of the piping and for periodic and major servicing of the equipment.

7.Relief valves on the cooler and condenser must be vented to the outdoors as discharging refrigerant in closed spaces may displace oxygen and cause asphyxiation. All field-supplied refrigerant relief piping and devices must be used in accordance with ANSI/ ASHRAE standard 15.

Dual pressure relief valves are mounted on the three-way valves in some locations to allow testing and repair without 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 dis- charge 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 pressure drop in all sections downstream of the relief valves.

8. Service access should be provided per standards ANSI/ASHRAE 15 and ANSI/NFPA 70 (NEC) and local safety codes. Unobstructed space adequate for inspection, servicing and rigging of all major components of the chiller is required. Shaded service areas are shown on the certified machine assembly drawing plan view and front view. See machine assembly component disassembly drawing for component removal. Space for rigging equipment and compres- sor removal is not shown.

9.The installation of chilled water and cooling tower water strainers should be considered to prevent debris from collecting in the water- boxes and degrading performance.

10.Flexible conduit should be used for the last few feet to the control center for vibration isolation of power wiring and control wiring.

Fig. 50 — 23XRV with Unit-Mounted VFD/Control Center

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