York YS Service Manual download pdf (Page 37)

5 COMMISSIONING

5.1 Preparation

Commissioning of this unit should only be

carried out by York authorised personnel.

The Operating Instruction manual must be read in

conjunction with this section.

Preparation - Power Off

The following checks should be made with the customer

supply/supplies to the unit switched off.

Inspection: Inspect unit for installation damage. If

found take action and/or repair as appropriate.

Valves: Open the oil separator valve, liquid line service

valve, oil system, unloader and liquid injection service

valves.

Compressor Coupling Alignment: Verify that the

compressor drive coupling is correctly aligned.

Refrigerant Charge: Units are normally shipped as

standard with a full refrigerant operating charge. Check

that refrigerant is present and that no leaks are apparent

(the refrigerant level should be in the middle of the

evaporator sight glass). If no refrigerant is present a leak

test must be undertaken, the leak(s) located and

repaired. Repaired systems and units supplied with a

nitrogen holding charge must be evacuated with a

suitable vacuum pump/recovery unit as appropriate

(refer to Section 7 for details).

Oil System: Check the oil system is correctly charged

and the oil level is visible in the upper sight glass on the

oil separator.

Isolation/Protection: Verify that all sources of

electrical supply to the unit are taken from a single point

of isolation.

Control Panel, Motor Terminal Box or Solid State

Starter: Check the panels to see that they are free of

foreign materials (wire, metal chips, etc.) and clean out if

required.

Power connections: Check the customer power

cables are connected correctly.

Earthing: Verify that the units protective terminal(s) are

properly connected to a suitable earthing point. Ensure

that all unit internal earth connections are tight.

Supply voltage: Verify that the site voltage supply

corresponds to the unit requirement and is within the

limits given on the unit data plate.

The customers disconnection devices can now be set to

ON.

The machine is now live!

Oil Heater: Verify the oil heater is energised for at least

24 hours prior to start-up.

Compressor Motor: Check the phase rotation

sequence of the incoming supply corresponds to the

required rotation for the motor.

Water/Glycol system(s): Verify that the cooling and

chilled water systems have been installed correctly, and

commissioned with the correct direction of water flow

through the condenser and cooler. Purge air from the

top of the condenser and cooler using the plugged air

vents.

Flow switch(es): Verify a chilled water flow switch is

correctly fitted in the customer’s pipework on the cooler

outlet, and wired into the control panel.

Temperature sensor(s): Ensure the temperature

sensors are coated with heat conductive compound

(Part No. 013-00890-000) and inserted into the sensor

pockets.

Programmed options: Verify that the options factory

programmed into the control centre are in accordance

with the customers order requirements. Refer to the

Operating Instructions for details.

Programmed settings: Ensure the system setpoints,

cut-outs and operational settings are in accordance with

the instructions given in the Operating Instructions.

Date & time: Programme the date and time (see

Operating Instructions).

Start/Stop schedule: Programme the daily and holiday

start/stop (see Operating Instructions).

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York YS Service Manual Page 37

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