22
Evo Control 17 & 25 Manual
8. Maintenance
Check the water supply and air vent frequently to avoid any lack of water, or air in the water Loop. Clean the water
filter according to a schedule to keep good water quality. Lack of water and dirty water can damage the unit. The
heat pump will start the water pump every 72 hours when it is not running to keep it from freezing.
Keep the unit in a place which is dry, clean and has good ventilation. Clean the heat exchanger according to a
schedule to keep a good heat exchange rate and save energy.
Check each part of the unit and the pressure of the system. Replace the failing part if there is any and recharge the
refrigerant if it is needed.
Check the power supply and the electrical system, make sure the electrical components are good and that the wiring
is correct. If there is any part failing with incorrect actions or smell, please replace.
If the heat pump is not used for a long time, please drain out all the water in the unit and seal the unit to keep it
good. Please drain the water from the lowest point of the heat exchanger to avoid freezing in winter. Water
recharge and full inspection on the heat pump is needed before it is restarted.
Please drain out the water in the super heater of the heat pump unit in winter when the super heater is not used.
The water loop of the heat pump MUST be protected from freezing in winter time. Please pay attention to below
suggestions. Non-observance on below suggestions will invalidate the warranty for the heat pump.
1.
Please do not shut off the power supply to the heat pump in winter. When the air temperature is below
0°C, if the inlet water temperature is above 2°C and below 4°C, the water pump will start the freezing
protection function, if the inlet water is lower than 2°C, the heat pump will begin heating.
2.
Use anti-freezing liquid (glycol water)
1.
Look for below table for the volume of the glycol water
2.
The glycol water can be added into the system from the expansion tank of the water loop.
Glycol Percentage
(%)
10
20
30
40
50
Ambient
Temperature
(Celsius)
-3.0
-8.0
14.0
-22.0
-33.0
Cooling/Heating
Capacity
Fluctuation
0.991
0.982
0.972
0.961
0.946
Power Input
Fluctuation
0.996
0.992
0.986
0.976
0.966
Water Flow
Fluctuation
1.013
1.040
1.074
1.121
1.178
Water Drop
Fluctuation
1.070
1.129
1.181
1.263
1.308
Note: If there is too much glycol water, the water flow and water pump will be influenced, and the heat exchange
rate will decrease. This table is for reference, please use anti-freezing water according to the real conditions of the
local climate.