Maintenance; General Requirements; Planned Maintenance - comatec AQWL Installations- Und Wartungshandbuch

Carefully read the "Safety" section of this manual before carrying
out any maintenance operations.
Do not discharge the refrigerant into the
atmosphere while the refrigeration circuits
are being drained. Use appropriate recovery
equipment.
DANGER
When the recovered refrigerant cannot be re-
used, return it to the manufacturer.
Do not throw away the waste oil of the
compressor, because it contains refrigerant in
solution.
The waste oil must be returned to the
DANGER
manufacturer.
Unless otherwise specified, the operations described below may be
carried out only by a trained maintenance operator.

9.1 General requirements

Units have been designed for continuous operation, providing
that they are subjected to regular maintenance, within the limits
specified in this manual. Each unit must be serviced according to the
programme by the User/Customer, and must be inspected at regular
intervals by the personnel of one authorised Service Centers.
It is the responsibility of the User to meet these maintenance
requirements and/or to enter into an agreement with one of authorised
Service Centers, so as to properly safeguard the operation of the
appliance.
During the warranty period, in case of damage or failures caused
by improper maintenance, manufacturer will not refund the costs
incurred to repair the appliance in its original state.
The provisions of this section apply only to standard units; according
to the order requirements, other documentation may be added,
concerning any modifications or supplementary accessories.

9.2 Planned maintenance

Maintenance inspections must be carried out according to the
program below, by a qualified person.
As a general rule, units cannot be repaired directly by the user, who
shall not try to service or repair any failures or anomalies identified
during daily inspections. If you are in doubt, please contact authorised
Service Centre.

9 - Maintenance

Check the temperature
of the leaving fluid
Check the pressure drops
in the heat exchanger
Check for electric absorption
Check suction pressure
and temperature
Check delivery pressure
and temperature
Check the oil level in the compressor
Check that there are no gas bubbles
in the liquid line
Check that the fins of
the external coil are clean (if any)
Check the operation of the oil heaters
Check the remote control switches
Check the operation
of the LP pressure switch
Check the operation
of the HP pressure switch
Check the insulation of
the heat exchanger
Check that terminals are tightened
Check that the terminals'
screws are tightened
Clean the exterior of the unit
with water and soap
Check the density
of the antifreeze (if any)
Check the operation
of the flow switches
Check the operation
of the solenoid valve
53
Operations
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
• •
•
• •