Air-to-water Heat Pump Split Versati
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 ow.
Note: the lter, safety valve, check valve, pressure maintaining valve, cut-o 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 uid must be added into the water cycle and external
water pipes should be properly insulated. Glycol solution is recommended as the anti-freeze uid.
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
Suld Cannot be detected mg/L
Oxygen consumption
＜
3 mg/L
Natrium
＜
150 mg/L
Note: when circulation water fails to meet requirements listed in the table above, please add anti-scale
composition to keep the unit always in normal operation.
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