Unit installation

• Turn on the chilled water pump, check direction of rotation and adjust the water flow through the cooler to the

specified flow rate. Bleed off all entrained air.

• Calibrated pressure gauges have been connected to the suction, discharge and oil pressure ports.

• Manually energize the condenser fan starters and check the fan rotation which can be changed on 3-phase motors

by interchanging any two wires on the main terminal block.

• Check the power supply voltage. Do not operate the unit if voltage deviation is not within acceptable range

(acceptable voltage range is ± 10% of the rated nominal voltage - temporarily).

Do not utilize generator power for Start-up & Commissioning or Operating

these units, it could be detrimental for this equipment. Consult Zamil for further

information and guidance in this regard.

START-UP OF THE SYSTEM

During Start-up and Commissioning, there should be sufficient heat load to run

the unit under stable full load operation to enable the unit controls, and system

operation to be set up correctly and a commissioning log taken. Ensure that

the Microprocessor Controller is properly programmed - refer to the relevant

section in this manual.

Make use of the Start-up and Commissioning checklist provided in the

Appendix section of this manual for step by step guidelines to accomplish this

task.

Controller Setpoints:

Adjust the controller custom set points as necessary following the instructions given in Microprocessor Controller

section of this manual and ensuring compliance with the requirements. If you are not sure of the appropriate set

points, do not try to change/modify the current set point and contact ZAMIL for guidance.

Start-up:

• Start the unit by pushing ON/OFF key in the controller. The ON LED is lit.

• After 15 seconds delay, the unit is operational.

• At first call for cooling, the controller will de-energize the crankcase heater and start one condenser fan.

• After 20 seconds from condenser fan operation, the lead compressor and liquid solenoid valve are operated.

• Allow the unit to stabilize and confirm proper operation before moving to SYSTEM CHECKOUT.

• To halt the unit, press again ON/OFF key and the ON LED is off.

Notes:

Rate of compressor staging and bringing on more compressors depends on load requirement sensed via

Leaving Water Temperature (LWT).

CAUTION

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ATTENTION

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