Phase Protector; Fan Speed Controller (Optional) - McQuay C Serie Manual De Instalación

• All field wiring must be installed in accordance with the national wiring regulation.
• All the terminals and connections must be tightened. Improper connection and fastenings could cause electric shock,
short circuit and fire.
• Ensure that the rated voltage of the unit corresponds to that of the name plate before commencing wiring work
according to the wiring diagram.
• The unit must be GROUNDED to prevent possible hazards due to insulation failure.
• All electrical wiring must not touch the refrigerant piping, compressor, pump, fan motor or any moving parts of
the fan motors.
• Do not operate the chiller with wet hands. It would result in electric shock.
• Do not use fuse of different amperage than stated. Using wire etc. to replace a fuse could cause equipment damage
or fire.
Electrical Wiring Diagram (please refer to Appendix 3 to 10).
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device (phase protector) is
fitted to prevent incorrect wiring of the electrical phases. When the three phases are not connected correctly, the phase
protector operates, and the unit will not start. This device is located in the control box of the outdoor unit.
The following table shows the LED indicator light for phase protector under normal operation and fault conditions.
LED
Description
Normal operation
Reverse phase
T phase missing
S phase missing
R phase missing
+
S &T phase missing
+
Overload
+
Sensor missing
ON
Notes : 1. "+" indicates additional functions for PP01 phase protector.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 and relay 81 will cut off.
Operation of the mini chillers without any fan speed control is limited to an ambient tem-
perature 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 refrig-
erant 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. 3. Ensure there is no
leakage at the joint.
Wire the fan speed controller to the terminal blocks. See Fig. 4.
! ! ! ! ! CAUTION

PHASE PROTECTOR

PW PR PS
(Yellow)
(Red) (Yellow) (Yellow)
OFF

FAN SPEED CONTROLLER (OPTIONAL)

PT
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
High discharge temperature. Check the refrigerant system.
Switch off the unit. Plug in sensor.
Fast Blink
1-6
Actions
-
15 Nm
Figure 3