York YS Service Manual download pdf (Page 38)

5.2 First Time Start-up

During the commissioning period 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.

Read the following section in conjunction with

the control centre Operating Instructions and

Section 6.

Interlocks: Verify that water is flowing through the

cooler and that heat load is present. Ensure that any

remote run interlocks are in the run position and that the

run schedule requires the unit to run or is overridden.

Start-up: Start the unit in accordance with Section 6 and

be ready when the compressor starts to switch the unit

off immediately if any unusual noises or other adverse

conditions develop.

Operation: Check the system operating parameters are

normal by selecting the various readouts of pressure,

temperature, etc on the control centre.

Oil Level: After operation on full load for around half an

hour, recheck the separator oil level. The level should be

visible in the first stage sight glass. Add or drain oil as

necessary to achieve this level. No oil level should be

visible in the second stage sight glass.

Superheat: The suction superheat at the compressor

can be assessed by checking the discharge

temperature. The discharge temperature should always

be at least 8°C above discharge saturated on

temperature, but never more than 100°C.

Refrigerant Charge: If stable full load operation can be

achieved at design conditions, than the refrigerant

charge should be trimmed to give the correct split

temperatures across the heat exchangers. The level

this charge represents in the evaporator sight glass

(after shutdown and temperature equalisation) should

be recorded for reference.

5-2 035L02381-GB0

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York YS Service Manual Page 38