Heat Pump
Unitherm 3 R32
52
①
②
③
①
Safety valve
②
Regulator
③
Filter
Drainage
Installation Mode 3 of the Tap Water Safety Valve (Inlet Water Pressure>0.5MPa)
A pressure maintaining valve is required in the installation mode 3 to make sure the water tank pressure keep
within 0.3~0.5MPa. The arrow direction of the pressure maintaining valve should be the same as the water flow.
Note: the filter, safety valve, check valve, pressure maintaining valve, cut-off valve and hose for installation are
not delivered with the main unit and should be prepared by the client.
21.4 Notice before seasonal use
(1)Check whether air inlets and air outlets of indoor and outdoor units are blocked;
(2)Check whether ground connection is reliable or not;
(3)If unit starts up after not operating for a long time, it should be power on 8 hours before operation starts so as
to preheat the outdoor compressor;
(4)Precautions for Freeze Protection in Winter
Under subzero climatic conditions in winter, anti-freeze fluid must be added into the water cycle and external
water pipes should be properly insulated. Glycol solution is recommended as the anti-freeze fluid.
Concentration
%
Freezing Temp
°C
Concentration
%
Freezing Temp
°C
Concentration
%
Freezing Temp
°C
4.6
-2
19.8
-10
35
-21
8.4
-4
23.6
-13
38.8
-26
12.2
-5
27.4
-15
42.6
-29
16
-7
31.2
-17
46.4
-33
Note: “Concentration” listed in the table above indicates the mass concentration.
21.5 Requirements on water quality
Paramete
Parametric value
Unit
pH( 25°C)
6.8~8.0
/
Cloudy
＜
1
NTU
Chloride
＜
50
mg/L
Fluoride
＜
1
mg/L
Iron
＜
0.3
mg/L
Sulphate
＜
50
mg/L
SiO
2
＜
30
mg/L
Hardness(count CaCO
3
)
＜
70
mg/L
Nitrate(count N)
＜
10
mg/L
Conductance(25°C)
＜
300
μs/cm
Ammonia (count N)
＜
0.5
mg/L
Alkalinity(count CaCO
3
)
＜
50
mg/L
Sulfid
Cannot be detected
mg/L
Oxygen consumption
＜
3
mg/L
Natrium
＜
150
mg/L
