7
MAINTENANCE
Never release refrigerant to the
atmosphere when emptying the
refrigerating circuit. Suitable retrieval
equipment must be used. If reclaimed
refrigerant cannot be re-used. It must be
returned to the manufacturer.
Never discard used compressor oil, as it
contains refrigerant in solution. Return
used oil to the oil manufacturer.
The Safety Section of this manual should be read
carefully before attempting any maintenance
operation on the unit.
Unless otherwise indicated, the maintenance
operations described below can be performed by any
properly trained maintenance technician.
7.1
General Requirements
The York YCAA range has been designed to work
continuously provided they are regularly maintained
and operated within the limitations given in this manual.
Each unit should be maintained in accordance with the
schedule by the operator/customer, backed up by
regular service and maintenance visits by an Authorised
York Service Centre.
It is the responsibility of the owner to provide for these
regular maintenance requirements and/or enter into a
maintenance agreement with a York Service Centre to
protect the operation of the unit.
If damage or a system failure occurs due to improper
maintenance during the warranty period, York shall not
be liable for costs incurred to return the unit to
satisfactory condition.
This maintenance section applies only to the basic unit
and may, on individual contracts, be supplemented by
additional requirements to cover any modifications or
ancillary equipment as applicable.
7.2
Daily Maintenance
The maintenance checks should be carried out in
accordance with the maintenance schedule detailed
below by a competent person. Please note, however,
that YCAA series units are not generally user
serviceable and no attempt should be made to rectify
faults or problems found during daily checks. If in any
doubt, contact an Authorised York Service Centre.
Scheduled Maintenance
Operation
D
ai
ly
W
ee
kl
y
M
on
th
ly
S
ta
rt
of
S
ea
so
n
E
nd
of
S
ea
so
n
Check evaporator leaving liquid
temperature
l
Check evaporator pressure drop
l
Check
electrical
power
consumption
l
Check suction pressure and
temperature
l
Check discharge pressure and
temperature
l
Check compressor oil level
l
Check for gas bubbles in
refrigerant
l
Check finned coil cleanliness
l
Check oil heater efficiency
l
Check Remote Control Unit
l
Check low pressure switches /
transducers
l
Check high pressure switches /
transducers
l
Check evaporator insulation
l
Check tightness of wiring
terminal screws
l
Clean outside surface of the unit
with soapy water
l
Check water differential switch
l
Check specific gravity of brine
(Glycol) if applicable
l
l
Drain and clean the evaporators
l
(09/03)
035B09012-100 Rev. 4
7
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