York YS Service Manual download pdf (Page 41)

6.8 Operating Inspections

By following a regular inspection schedule any potential

problems with the unit can be identified early and

attended to before serious operating difficulties occur.

The following list of inspections and procedures should

be used as a guide. In all cases the inspections should

only be carried out by properly trained personnel. If a

problem is identified, no attempt should be made to

carry out any repairs unless properly qualified and

equipped to do so. Where appropriate, refer to the

control centre Operation Instruction for correct keypad

operation to access data on the control centre display.

Daily

1. Check the bearing oil pressure: The actual

bearing oil pressure will vary with compressor

suction and discharge pressures. When a new

system is first operated under normal full load

conditions, the bearing oil pressure should be

recorded as a reference point with which to

compare subsequent readings.

2. Check Oil Pressure Display: The oil and oil filter

transducers are compared during compressor

operation. If the differential filter pressure exceeds

140 kPa for 5 seconds, the message WARNING -

DIRTY OIL FILTER is displayed. If the differential

filter pressure exceeds 170 kPa for 5 seconds, the

unit shuts down and the displayed message is

CLOGGED OIL FILTER. A gradual decrease in

bearing pressure of 30 to 60 kPa (with constant

suction and discharge pressures) may be an

indication of a dirty filter. The filter should be

replaced when pressure loss is 30% of the original

pressure.

3. Check the oil level in the oil separator reservoir:

The correct oil level is half way up the sight glass

but this may vary depending on load. The level

should not disappear from the sight glass.

4. Check entering and leaving condenser water

temperatures and condenser pressure for

comparison with design conditions.

5. Check the entering and leaving chilled liquid

temperatures and evaporator pressure for

comparison with design conditions.

6. Check the compressor discharge temperature:

During normal operation discharge temperature

should not exceed 100°C

7. Check the compressor motor voltage and

current: At the Electro Mechanical Starter or on the

control centre display for units with a Solid State

Starter.

8. Check for any signs of dirty or fouled condenser

tubes. The temperature difference between water

leaving condenser and liquid refrigerant leaving the

condenser should not exceed the difference

recorded for a new unit by more than 2.2°C.

9. Check water treatment is correct.

10. Any time the control centre display indicates

PRESS STATUS KEY, do so to read any warning

messages to be displayed.

6.9 Operating Log Sheet

An accurate record of system operating conditions

(temperatures and pressures) recorded at regular

intervals throughout each 24 hour operating period

should be kept. An optional status printer is available for

this purpose using automatic data logging after

programming the DATA LOGGER function.

The record of readings serves as a valuable reference

for operating the system. Readings taken when a

system is newly installed will establish normal

conditions with which to compare later readings. A

sample log sheet is provided opposite, listing the

appropriate unit information which should be recorded

regularly.

6.10 Maintenance and Service

Units are not generally user serviceable and no attempt

should be made to rectify any faults found with the unit

unless suitably qualified and equipped to do so. If the

unit is malfunctioning in any manner, or the unit is

stopped by one of the safety controls, consult Section 8.

After repair or adjustment if the compressor cannot be

started or the particular fault continues to affect the

performance of the unit, please call the nearest York

Office. Failure to report recurring problems or continued

operation of a malfunctioning unit may lead to personal

injury or damage to the unit.

6.10.1 Normal and Safety System Shutdowns

Normal and safety system shutdowns have been built

into the unit to protect it from damage during certain

operating conditions. The unit will be stopped

automatically by controls that respond to high

temperatures, low temperatures, and low and high

pressures, etc. These safety shutdowns require the

operator to manually reset the control centre prior to

restarting the unit.

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York YS Service Manual Page 41

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