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The type of refrigerant and the refrigerant charge is attached on a sticker applied next to
compressor.
Refrigerant contains fluorinated hydrocarbons indicated in the Kyoto Protocol with the follow-
ing global warming potential (GWP = Global Warming Potential), based on CO2 (data from
EN378 part 1):
R407C: GWP = 1650
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R410A: GWP = 1980
R134A: GWP = 1300
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9.10.2 Maintenance
has to be performed only by qualified personal and at least once a year.
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has to be documented in supplied Records for refrigeration circuit application in air-
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conditioning units.
Whole system:
Check pressures and temperatures of the system.
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Pay attention to unusual operating noises and to possible vibrations.
Compressor:
Check oil sight glass in the crankcase (if present); in the on mode must be visible oil in
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the sight glass; otherwise must be checked if there has been loss of oil (even outside of
the unit is possible); and optionally fill in oil directly by an oil pump directly into the com-
pressor suction side. Only use oil that is approved by compressor manufacturer.
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Out of compressor operation compressor crankcase heater switches on in order to avoid
an accumulation of refrigerant in the oil. Too much refrigerant in the oil causes a dilution
of the oil resulting in a loss of viscosity leading to reduced lubrication of all moving parts.
To start the compressor manually, it has to be proceeded as described in chapter 8.2.2
(Manually starting the compressor via TRANE control system).
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Follow maintenance and inspection requirements of compressor manufacturer. These
instructions are supplied from TRANE or can be ordered from TRANE.
Filter drier:
Each refrigeration circuit is equipped with a filter drier. If refrigeration circuit has to be re-
paired 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
Indicator yellow
If 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 operating refrigeration circuit. In both
sight glasses (note: sight glass on receiver according to circuit execution not always sup-
plied) refrigerant must be visible. The sight glass in liquid line must be filled completely.
Expansion valve:
Check superheating of expansion valve which should amount to 5 to 10K. Check that the
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temperature sensor is correctly fitted as well as the pressure compensation pipe.
=
dry
=
wet
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