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■ Quarterly Maintenance
(1) Check the electric wiring and electric insulation.
(2) Check and adjust the set point of the temperature.
■ Yearly Maintenance
(1) Check valves and pipeline of the water system. If necessary, clean the filter and analyze the water
quality. If the water circuit needs to be cleaned, please consult the assistance of the qualified
personnel.
(2) Clean the corrosive surface and paint it again, and check if the door of the electric control cabinet is
tightly closed.
(3) Check if the pipeline is secured and so the water pump and fittings. Additionally, check if the
refrigerant charge is sufficient, if not, add some.
(4) Perform the items for weekly maintenance.
(5) Check if the control device is set and acts properly.
(6) Check if the refrigerant pipe is attached securely.
(7) Check if the refrigerant pipe is attached securely.
7.14 Precautions
(1) Take periodic maintenance to the unit to guarantee normal operation.
(2) Once refrigerant leaks, shut down the unit immediately and contact the serviceman. No open fire is
allowed in that refrigerant will decompose into toxic gas.
(3) Switch off the main power supply in case of a fire hazard and extinguish it with effective measures.
(4) The working environment shall be far away from the inflammable substance, such as petroleum and
alcoholic etc. to avoid explosion.
(5) The unit is allowed restarted only after any malfunction is eliminated, otherwise refrigerant or chilled
water would leak, in which case, it is imperative to turn off all switches or the main power supply.
(6) Do not short-circuit the protection device, otherwise it would cause some malfunction.
■ The credentials of qualified service personnel
– Any person who is involved with working on or breaking into a refrigerant circuit should hold a current
valid certificate from an industry-accredited assessment authority, which authorises their competence to
handle refrigerants safely in accordance with an industry recognised assessment specification.
– Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance
and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of
the person competent in the use of flammable refrigerants.
■ Checks to the area
Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised. For repair to the refrigerating system, the following
precautions shall be complied with prior to conducting work on the system.
■ Work procedure
Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas
or vapour being present while the work is being performed.
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
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