Carrier GY Instruções de Operação descarregar pdf (Página 12)

Power supply

The power supply must conform to the specification on the

chiller nameplate. The supply voltage must be within the range

specified in the electrical data table.

For connections refer to the wiring diagram.

Electrical connections (30GY/GV 044-059)

Carry out the electrical connections between the control boxes

in accordance with the diagram below and with the wiring

diagram supplied with the unit; ensure that the cables are

routed through the conduits.

All cables are labeled A B C D and E F (option 70).

Electrical connections

Start-up

Preliminary checks

Never be tempted to start the chiller without reading fully, and

understanding, the operating instructions and without having

carried out the following pre-start checks :

• Confirm that all crankcase heaters are working by feeling

all compressor crankcases. Every compressor has a 200 W

cartridge heater (see the wiring diagram). The heater

remains energised even when the chiller is shut down to

stop the lubricating oil from absorbing refrigerant.

• Check the operation of all accessories - chilled water

circulating pumps, air handlers and other equipment

connected to the evaporator. Follow the individual

manufacturer's instructions for this equipment.

• It is recommended to connect the auxiliary contact of the

water pump contactor to ensure maximum unit safety (see

wiring diagram delivered with the unit).

• Fill the chilled water circuit with clean water, and an

inhibitor formulated specifically for this purpose, or fill it

with another non-corrosive fluid to be chilled.

• Purge air at all high points in the system. If water

temperatures below 5°C are likely, add the appropriate

volume of ethylene glycol to prevent freezing.

• Confirm that the suction and discharge line stop valves are

fully opened.

• Open the refrigerant line valves. Check again that the

water circuit valves are open.

• Check that oil is visible in each compressor sight glass to

between 1/8 and 3/8 of the total glass depth (check for all

compressors).

• Confirm that there are no refrigerant leaks.

• Confirm that all crankcase heaters are firmly in place, and

check the secure positioning of all control sensors.

• Confirm that discharge muffler securing bands and

discharge line connections are tight.

• Check that all electrical connections are secure.

• Turn the fan shafts by hand to ensure that they rotate

freely. Check the stability of the fan wheels on the shafts.

Check the tightness of the fan shaft bearing mounts. All

fan bearings are lubricated with lithium grease for a rated

minimum life of 40,000 hours.

• Check the alignment of the motor and fan pulleys.

• Belt tension: too little will allow the belts to slip on the

pulley, too much will put the bearing under stress.

• At the start-up observe the fan and verify that its rotation

is correct, as indicated by the arrow on the scroll. To

reverse the rotation, interchange any two of the three

phases in the junction box of the motor.

WARNING: Operation of the chiller with an improper supply

voltage or with excessive phase imbalance constitutes abuse

which will invalidate the Carrier warranty. If the phase

imbalance exceeds 2% for voltage, or 1% for current, contact

your local electricity supply company at once and ensure that

the chiller is not switched on until corrective measures have

been taken.

Voltage phase imbalance (%) :

= 100 x max.deviation from average voltage deviation

Average voltage

Electrical checks

WARNING: Never switch off the power supply to the crankcase

heaters unless the chiller is out of service for a seasonal

shutdown or lengthy repair. The heaters must be re-energised

for at least 24 hours before the chiller is restarted.

a. Switch the unit off.

b. Open the control circuit disconnect switch.

c. Check the transformer connections.

d. Ensure that the control circuit corresponds to the wiring

diagram for the unit.

e. Check that all electrical connections are secure at the

terminals, contactors, bus bars and compressor terminal

blocks.

Control box B

Control box A

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