York International YCAA B 120, Installation, Commissioning, Operation And Maintenance Manual

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5 COMMISSIONING
The unit must be started by trained personnel
from an Authorised York Service Centre.
Failure to satisfy this requirement will void the
warranty.
The operations performed by York service
personnel are limited to unit starting, and do
not include other work on system such as
electrical connection, water connection, etc.
All other preparatory work, including oil
pre-heating (for at least 12 hours) must be
performed by installer.
5.1 Preliminary Checks
The following operations must be performed before
starting the unit and should be performed before York
service personnel arrive.
n
With master isolating switch off, check the supply
cable cross-section, the ground connection, the
electrical terminal clamps are tight and that all
contactors operate correctly.
n
Check that the voltage and phase unbalance of the
power supply is within limits, refer to Section 4.
n
Connect (non-energised) contacts of the flow
switch and the pump thermal overload cut-out or
other devices (where provided) to terminals 1-2
and 3-4 respectively.
n
Check that the external water circuit components
(pumps, user equipment, filters, expansion tank
and reservoir where provided) have been correctly
installed as advised by manufacturer and that the
inlet and outlet water connections are correct.
n
Check that the external water circuit is full and that
the fluid circulates freely with no signs of leakage or
air bubbles. If ethylene glycol antifreeze is used,
check that the percentage concentration is correct.
n
Check that the pump direction of rotation is correct,
and allow fluid to circulate for at least 24 hours (12
hours for each pump). Then clean the basket filters
on the pump suction.
n
Adjust the water system so that the flow rates are
as specified.
n
Check that the water quality is as specified.
n
Check the position of the safety and anti-icing
thermostat sensors.
n
Check that the oil heaters, if fitted have been
energised for at least 12 hours.
5.2 Starting
The starting sequence is as follows.
n
Turn on the master isolating switch (12 hours
before).
n
Check that the compressor oil is sufficiently warm
(minimum temperature at the oil pan exterior must
be approximately 40°C) and that the auxiliary
control circuit is energised.
n
Check that all external equipment is in running
order and that the associated control equipment is
correctly calibrated.
n
Start the liquid pump and check that the water flow
rate is as required.
n
Set the desired fluid inlet temperature on the
control panel (refer to Section 6).
n
Start the unit (refer to Section 6).
n
After around 15 minutes of operation, check that no
air bubbles are visible through the sight glass on
the fluid line.
If air bubbles are visible, the unit has lost part
of its charge through one or more leaks. The
leaks must be eliminated refer to Section 7.
n
Repeat the starting procedure after eliminating the
leaks.
n
Check that the oil level is correct.
(09/03)
035B09012-100 Rev. 4
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