Water Pipe Connection - Haier CA0065EANR Service Manual

6.3 Water pipe connection

■ Water Pipe Connection
1. External water pipe system must be equipped with flexible joints, water filter, electronic cleaner, check valve,
drain valve, exhaust valve, shutoff valve, expansion tank, etc.. The expansion tank shall be located at 1-1.5 m
above the highest point of the system; the exhaust valve shall be set between the highest point of the system
and the expansion tank, and insulations shall be arranged between the tank and the pipe.
2. Water supply system must be a water pump with appropriate flow and head to ensure the normal water supply
to the unit. The circulating water must be softened water.
3. A water filter must be installed in front of the inlet pipe of the unit, and the self-contained water filter also must
be installed.
4. The connection between the water pump and the unit and between the water pump and the water pipe shall be
realized through flexible joints; in addition, the pipe and the water pump shall be supported separately, so as to
not apply any force on the unit.
5. Flushing and heating of water pipe shall be carried out prior to the connection between the pipe and the unit.
6. The drain valve on the outlet pipe is self-contained; manual or automatic exhaust valve shall be set at the
highest point of the water circulation system; for the normal operation of the unit, the valve handle must be
removed, so that the valve is not adjusted.
7. Water quality control
Industrial water used as hot water is not likely to produce scale; while, well water or river water may produce
a lot of scale, sand and other sediments. So, before flowing into the hot water system, the water must be
filtrated and softened by water softening equipment. If sand or mud deposits in evaporator, the flow of hot
water will be blocked, resulting in freezing; so relevant water values such as PH, electric conductivity, chloride
ion concentration, sulfur ion concentration shall be analyzed beforehand. Quality criteria of the water for the unit
are shown as follows:
Standard
Reference
Note:
○ Standing for scale, □ standing for corrosion
Item
PH
Electric conductivity
Chloride ion
Sulfate ion
Total iron content
Alkali ion
Total hardness
Sulfur ion
Ammonia ion
Silicon
Criteria
7.5-9.0
≤200 uv/ppm (25°)
≤50 ppm
≤50 ppm
≤0.3 ppm
≤50 ppm
≤50 ppm
N/A
N/A
≤30 ppm
16
Impact factor
○/□
○/□
□
□
□
□
□
□
□
○