5
COMMISSIONING
5.1
Preparation
Commissioning of this unit should only be
carried out by JCI Authorised personnel who
have attended a YCSE/YCRE training course.
The unit 'ON/OFF' switch on the front of the control
panel has been set to the 'OFF' position at the factory.
This switch must remain in the 'OFF' position,
preventing running of the unit until commissioned by JCI
Authorised personnel. If the switch has been set to the
'ON' position before commissioning then it must be
reported to JCI otherwise the warranty may be
invalidated.
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.
Refrigerant charge
Units are normally shipped as standard with a full
refrigerant operating charge. Check that refrigerant
pressure is present in both systems and that no leaks
are apparent. If no pressure is present a leak test must
be undertaken, the leak(s) located and repaired.
Charging from the liquid connection is
necessary on R407C to ensure the correct
refrigerant mix is maintained.
Do not charge liquid refrigerant with static water in the
cooler. Care must also be taken to charge liquid
refrigerant slowly to avoid excessive thermal stress at
the charging point. Once the vacuum is broken, charge
into the condenser with the full operating charge as
given in Section 9.
The stated operating charge is a guideline only and for
both YCSE and YCRE units the charge should be
rechecked at full load stable conditions (30mins
runtime) for correct suction superheat
(6°C), liquid
sub-cooling 5.5°C - 9.5°C water cooled, 5.5°C - 9.5°C
air cooled.
Valves
: Open the compressor suction valve (option),
discharge valve (option) and the liquid line service
valves on all systems.
Compressor oil
: Check the compressor oil for correct
level at the oil level sight glass. Full at commission
startup and no less than half full during normal
operation.
Isolation/protection
: Verify that all sources of electrical
supply to the unit are taken from point(s) of isolation.
Control panel
: Check the panel to see that it is free of
foreign materials (wire, metal chips, etc.) and clean out if
required.
Power connections
: Check the customer power
c a b l e s a r e c o n n e c t e d c o r r e c t l y . En s u r e th a t
connections of power cables within the panels to the
circuit breakers, terminal blocks or switch disconnectors
are tight.
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 in Section 9.
Switch Settings:
Ensure that the unit 'ON/OFF' switch
on the control panel is set to 'ON'.
The unit is now live!
Compressor heaters
: Verify the compressor heaters
are energised. The compressor heaters should be on
for 12 hours before start-up to bring the compressor oil
up to the correct operating temperature.
Chilled Liquid System
: Verify that the chilled liquid
system has been installed correctly, and has been
commissioned with the correct direction of water flow
through the cooler. Purge air from the top of the cooler
using the plugged air vent mounted on the top of the
cooler body. Ensure system flushing and water
treatment have been carried out and verify that water
make-up/pressurization units are operating correctly.
Cooling Liquid System:
Verify that the cooling liquid
system has been installed correctly, and has been
commissioned with the correct direction of water flow
through the condenser. Purge air from the top of the
condenser using the plugged air vent mounted at the top
of the condenser water head (YCSE only).
5
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1
035-21786-100 Rev. 1 (0909)
Summary of Contents for York YCRE 040
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Page 49: ...9 3 035 21786 100 Rev 1 0909 Suction Pressure Evaporator Sub cooling Temperatures...
Page 54: ...9 7 Clearances and Foundations 9 8 035 21786 100 Rev 1 0909...
Page 55: ...9 8 Dimensions 9 9 035 21786 100 Rev 1 0909 Model YCSE 040...
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