Carrier AQUAFORCE 30XW150-400 Specifications download pdf (Page 28)

CONDENSER FLUID CONTROL VALVE — For installa-

tions where entering condensing fluid temperature could be be-

low 65 F (18.3 C), a field-supplied control valve is required.

Operation below 65 F (18.3 C) without this valve may cause

the unit to shut down on low oil pressure alarms.

NOTE: A valve that can be controlled by a 0 to 10 vdc signal

is supported by the ComfortLink control system. Figure 13

shows the installation details for the regulating valve.

INSTALL PRESSURE RELIEF REFRIGERANT VENT

PIPING — The 30XW chiller is factory equipped with relief

valves on the evaporator and condenser shells. There is one re-

lief valve per circuit on the evaporator and two relief valves per

circuit on the condenser. Make the vent connection to the low

side relief valve by installing a male NPT to copper OD braze

adapter. Braze a 90-degree short-radius elbow to the adapter.

This will allow enough space to make vent connections to the

elbow. An additional relief valve is located on the liquid line

and the economizer assembly, if equipped, for each circuit.

Refer to Tables 1 and 2 for connection size information. If the

unit is equipped with an optional isolation service valve, an

additional relief valve is located on the discharge line. See

Fig. 3-5 for location and connection size information. See

Fig. 14 for location of temperature relief valves on the econo-

mizer assembly. Vent relief devices to the outdoors in accor-

dance with ANSI/ASHRAE (American National Standards

Institute/American Society of Heating, Refrigerating and Air

Conditioning Engineers) 15 Safety Code for Mechanical

Refrigeration (latest edition) and all other applicable codes.

PIPE

FLANGES

PRESSURE

GAGES

LEAVING

CONDENSER

WATER

ENTERING

CONDENSER

WATER

ENTERING

WATER

LEAVING

WATER

THERMOMETERS

(OPTIONAL)

AIR VENT

PIPE HANGERS

CHILLED

AIR VENT

THERMOMETERS

(OPTIONAL)

PRESSURE

GAGES

Fig. 12 — Typical NIH Piping

NOTES:

1. Chilled water flow switch is factory installed in the evaporator inlet nozzle.

2. Entering and leaving water thermistors are located in the evaporator inlet and outlet nozzles.

3. A

in. NPT vent plug is located in the top of the evaporator and condenser outlet nozzle.

4. A

in. NPT drain plug is located in the bottom of the evaporator and condenser inlet nozzle.

5. Condenser water flow switch is factory installed in the condenser inlet nozzle on units with

heat machine option only.

6. Entering and leaving water thermistors are located in the condenser inlet and outlet nozzles

on units with heat machine option only.

a30-5507

IMPORTANT: A separate, field-supplied power supply

must be used with the condenser fluid control valve. Fail-

ure to use a separate power supply may result in damage to

the electronic chiller components.

DANGER

Refrigerant discharged into confined spaces can displace

oxygen and cause asphyxiation.

INLET

OUTLET

CHILLER CONTROL PANEL

30XW CONDENSER

BYPASS VALVE

OPTIONAL BYPASS VALVE FOR NORMAL DUTY

3 WAY VALVE

(OPTIONAL)

SIGNAL

Fig. 13 — Condenser Fluid Control Valve Installation

A30-5279

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Carrier AQUAFORCE 30XW150-400 Specifications Page 28

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