MAXA R407C - Maintenance

CD 30 ÷ 520
37
13. Maintenance
To ensure the unit can reliably run for a long time, debugging and maintenance should be done
by the qualified persons. The items below should be noticed especially.
 Warning
If it is on fire, switch off the main power at once and eradicate the fire with extinguisher.
The unit can’t be operated near the flammable gas to prevent fire or explosion.
 Caution
Maintain unit regularly according to the reference to keep unit in a good condition.
Do not touch the discharge pipeline to avoid any scald.
If malfunction causes the unit stop, please refer to the “Troubles and solutions” part of this
manual or contact with us to find out the reason. After the malfunction is eliminated, the
unit can be restarted again. It is absolutely forbidden to forced restart the unit without
solving the problems. If refrigerant or chilled water (cooling water) has leakage, it must
shut down all switches. If the unit can’t be stopped by the controller, it must switch off the
main power to stop the unit.
Do not use any iron wire, copper wire instead of the demanded fuse, otherwise it will
cause the fire and damage the system.
Don’t make the protection device short-circuited, otherwise it may cause accident.
Maintenance for main components
During running, please notice the discharge pressure and suction pressure. If there is
anything abnormal, please find out the reason and eliminate the malfunction.
Don’t adjust the control and protection devices at random.
Query the wire connection regularly to confirm there is no any loose or bad contact caused
by oxidation or other reasons. Please frequently Query the work voltage, current and
phases balance.
Query the reliability of the electric components, and replace the invalid and the unreliable
in time.
 Descaling
After a long term running, the surface of the heat exchanger of waterside will form calcium
oxide and other mineral. Those kinds of material will decrease the heat transfer efficiency, cause
more power consumption and higher discharge pressure (or lower suction pressure). These
materials can be cleaned by formyl, citric acid, vinegar acid, etc, but any liquid which contains
chlorine acid or fluoride ingredient is forbidden. Because the pipe is made of stainless steel, it is
easy to be rotted by such material.