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(4)Refrigerant charging would be affected by environment temperature. If refrigerant is un-
dercharged, start the water pump to circulate chilled water and meanwhile start the unit for
refrigerant adding. In this case, vapor refrigerant should be charged.
7.6 Exploded Views and Part Lists
8 Maintenance
8.1 Significant of Maintenance
The unit has undergone a series of strict tests prior to delivery to ensure qualified
performance, however, in order to keep reliable performance and extend its service life, the
unit should be maintained routinely and periodically by the qualified servicemen.
8.2 Maintenance Items
8.2.1 Routine Maintenance Items
Routine Maintenance Items
Is there any unusual noise and vibration?
Is there any unusual noise and vibration for the compressor in operation? Is there any
unusual smell?
Do the operating pressure, voltage and current keep normal? If not, figure out the cause and
then eliminate it?
Are all temperature sensors and pressure transducers installed securely?
8.2.2 Periodic Maintenance Items
Periodic Maintenance Items
Is any wiring loosened and insulated securely?
Does any electric element work reliably? If not, change it timely?
Does any throttling valve and control valve leaks? Can any valve be opened or closed
flexibly? Is any filter clogged?
Is the temperature set point proper?
Is there a large amount of condensate at the chilled water pipe or the condensate pipe? Is
insulation layer damaged?
8.2.2.1 Requirements on Water Quality and Cleaning
Industrial water used as chilled water produces little scale, but well or river water will bring
much scale, sand and other sediment which then would block up the chilled water flow and
make the evaporator frozen up. Therefore, it is necessary to filter or chemically soften water
before it flows into the water system and also take analysis to quality. Once it is found water
quality is dissatisfactory, and then only industrial water is available.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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