Instruction Manual ZHK
V07-21.0
123/140
9.11.2 Maintenance
-
Has to be performed only by qualified personal and at least once a year.
-
Has to be documented in supplied
Records for refrigeration circuit application in air-conditioning
units
. Also, adhere to local regulations.
Whole system:
-
Check pressures and temperatures of the system.
-
Pay attention to unusual operating noises and to possible vibrations.
-
Possible dust deposits around components have to be removed.
Compressor:
-
When the compressor is switched on, there must be oil visible through the sight glass (if present).
If oil is not visible, ensure that there has not been a loss of oil (even outside of the AHU is possi-
ble). Optionally, add oil directly by an oil pump into the compressor suction side. Only use oil that
is approved by the compressor manufacturer.
-
During standstill periods of the compressor operation, the compressor crankcase heater switches
on in order to avoid an accumulation of refrigerant in the oil. Too much refrigerant in the oil causes
dilution of the oil, resulting in loss of viscosity, leading to reduced lubrication of all moving parts.
To start the compressor manually, it has to be commenced as described in
chapter 8.2.2
ually starting the compressor via EUROCLIMA control system
-
Follow the maintenance and inspection requirements of the compressor manufacturer. These
instructions are supplied by EUROCLIMA or can be ordered from EUROCLIMA.
Filter drier:
Each refrigeration circuit is equipped with a filter drier. If the refrigeration circuit has to be repaired,
the filter drier must be replaced.
Sight glass in liquid line and on receiver
Liquid line sight glass contains a moisture indicator for refrigerant, operating as follows:
Indicator green
=
dry
Indicator yellow
=
wet
If the indicator shows wet refrigerant, at least the filter drier must be changed. Further measures may
be necessary.
The correct quantity of refrigerant can be checked at the operating refrigeration circuit. In both sight
glasses (note: sight glass on receiver according to circuit execution not always supplied) refrigerant
must be visible. The sight glass in liquid line must be filled completely.
Expansion valve:
-
Check superheating of expansion valve, which should amount about 5 to 10K. Check that the
temperature sensor is correctly fitted as well as the pressure compensation pipe.
-
If an electronic expansion valve is used, necessary values must be entered into the correspond-
ing controller. Instructions of the controller from the valve manufacturer are included in the scope
of delivery or can be requested from EUROCLIMA.
High pressure safety switch:
The high pressure switch stops the compressor when the allowed equipment pressure limit is ex-
ceeded. A functional check must be carried out during commissioning and must be performed during
each undertaking of any maintenance work.
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