MCAC-2008-11 Air-cooled Modular Chiller
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14. 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：
1. If it is on fire, switch off the main power at once and eradicate the fire with extinguisher.
2. The unit can’t be operated near the flammable gas to prevent fire or explosion.
Caution：
1. Maintain unit regularly according to the reference to keep unit in a good condition.
2. Do not touch the discharge pipeline to avoid any scald.
3. 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.
4. Do not use any iron wire, copper wire instead of the demanded fuse, otherwise it will cause the fire and
damage the system.
5. Don’t make the protection device short-circuited, otherwise it may cause accident.
Maintenance for main components：
1. During running, please notice the discharge pressure and suction pressure. If there is anything abnormal,
please find out the reason and eliminate the malfunction.
2. Don’t adjust the control and protection devices at random.
3. Check the wire connection regularly to confirm there is no any loose or bad contact caused by oxidation or
other reasons. Please frequently check the work voltage, current and phases balance.
4. Check 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 water side 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.
1. Cleaning work of waterside heat exchanger should be operated by the professional, please contact with
our local MIDEA service center.
2. After cleaning by chemical liquid detergent, scour the pipeline with clean water and heat the exchanger
again. Pre-dispose the water to avoid rotting and forming of the scale again.
3. On the condition of using chemical liquid detergent, please select the intensity, cleaning time and
Temperature of the liquid according to the actual situation.
4. After cleaning, the waste liquid should be neutralized, so please contact the professional company to get
the further disposal for the waste.
5. Detergent and neutralization liquid are harmful to human beings, so it is necessary to use some protective
device, such as special glasses, gloves, shoes, mask, etc.
Turn off the unit in winter
When turning off the units in winter, clean and dry the inner and outer surface of the unit, then cover them to
prevent dust. Open the water discharge valve, drain away the water in heat exchanger of water side and
water pipe to prevent freeze. It is recommended to inject some anti-freeze material into the water pipe.
First start after the unit stops
The following must be done when restarting the unit after a long-term vacancy:
1. Check and clean unit thoroughly.
2. Clean the water system pipeline.
3. Check water pump, adjust switch and other devices of the water system.
4. Tighten all the wire connections.
Accessory replacement
Only MIDEA accessory can be used and please don’t use any different one.
Refrigeration system
Check the discharge and suction pressure to determine whether the unit needs to recharge or not. Take
leakage test for the system; if there is leakage or some components needs to be replaced, leakage test is
necessary. When recharging refrigerant, two cases must be separated:
1. The refrigerant has leaked out totally
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