MAXA R407C - Page 38

CD 30 ÷ 520
38
Cleaning work of waterside heat exchanger should be operated by the professional,
please contact with our local MAXA service center.
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.
On the condition of using chemical liquid detergent, please select the intensity, cleaning
time and Temperature of the liquid according to the actual situation.
After cleaning, the waste liquid should be neutralized, so please contact the professional
company to get the further disposal for the waste.
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 unit in winter, clean and dried 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:
Query and clean unit thoroughly.
Clean the water system pipeline.
Query water pump, adjust switch and other devices of the water system.
Tighten all the wire connections.
 Accessory replacement
Only MAXA accessory can be used and please don’t use any different one.
 Refrigeration system
Query 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:
The refrigerant has leaked out totally
In this case, leakage test must be done by using nitrogen (1520 kgf/cm
2
) or refrigerant. If
necessary, welding should be done after all gas of the system is discharged out.
1) Connect the vacuum pump pipeline to the refrigerant charging hole.