Fan Speed Controller (Optional); Isolator Switch Field Installation; Figure - McQuay AC20C / MAC020C Installation Manual

Air cooled chiller c series

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Operation of the mini chillers without any fan speed control is limited to an ambient temperature

of 17°C. With the fan speed control, the units are able to operate down to -5°C.

The fan speed controller does not come as a standard item in the mini chiller units. It is field-

installed.

All mini chillers will have a 1/4" access valve provided for along the liquid line of the refrigerant

circuit. This valve is for direct pressure connection to the fan speed controller.

To install the fan speed controller, screw in the female adaptor to the 1/4" access valve. Use a

pair of spanners to tighten properly (max. torque 15 Nm). See Fig. 8. Ensure there is no leakage

at the joint.

Wire the fan speed controller to the terminal blocks. See Fig. 9.

TO (PCB)

OUT_FAN1

OF IN

OF OUT

TB3

Remove this wire

when doing wiring

for fan speed

controller

Wiring for fan

speed controller

(FSC)

TO (PCB)

OUT_FAN1

OF IN

TB3

Remove this wire

when doing

wiring for fan

speed controller

Wiring for fan

speed controller

(FSC)

Figure 9

The isolator switch does not come as standard item with the units. It is advisable to have it field installed. The isolator switch must

be capable of making, carrying and breaking currents under normal circuit condition. It must be of AC23A duty and fully compliant

to IEC: 947-3.

For isolator switch selection, check the starting and running consumption specified in Table B. Be sure to connect a ground wire

from incoming power supply, either direct to the terminal box panel or use an auxiliary ground terminal in the isolator switch. To

install an isolator switch, wire it to the terminal block as shown in the two figures in page ix.