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19.3 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
%
4.6
8.4
12.2
16
Note: "Concentration" listed in the table above indicates the mass concentration.
19.4 Safety considerations
(1) Pressure relief of the water tank
The water may drip from the discharge pipe of the pressure-relief device and that this pipe must be left open to
the atmosphere.
The pressure-relief device is to be operated regularly to remove lime deposits and to verify that it is not blocked
A discharge pipe connected to the pressure-relief device is to be installed in a continuously downward direction
and in a frost-free environment.
(2) Installation of the water tank safety valve
Pressure of the water tank will gradually increase during heating and a safety valve is required to discharge
some water for pressure relief. If not or installed incorrectly, it would cause the water tank to expand, to be
deformed, to be damaged or even lead to personal injury. The arrow → of the water tank safety valve shall point
toward the water tank. No cut-off valve or check valve is required between the safety valve and the water tank, as
the safety valve would fail to work. The safety valve requires the drain hose for installation and should be securely
fastened. The drain hose should be led naturally downward into the floor drain without any convex bow, intertwist
or fold. Extra length of the drain hose inside the floor drain should be cut away in case of poor drainage or water
freeze under low atmospheric temperature.The recommended action pressure for the safety valve is 0.7Mpa, the
same as that for the water tank. Do comply with this requirement for section of the safety valve; otherwise the
water tank would fail to work normally.
The drain pipe should go downwards and be connected with the floor drain. Its outlet should be lower than the
bottom of the water tank. A cutoff valve is required for the drain pipe and should be installed where it is convenient
for operation.
Installation Mode 1 of the Tap Water Safety Valve (Inlet Water Pressure =0.1~0.5MPa)
Concentration
%
°C
-2
19.8
-4
23.6
-5
27.4
-7
31.2
Concentration
Freezing Temp
°C
-10
-13
-15
-17
①
②
① Safety valve
② Filter
Drainage
61
Freezing Temp
%
°C
35
-21
38.8
-26
42.6
-29
46.4
-33
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