Haier CA0035EAND, Service Manual, Page: 26 / 66

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■ SCHEMATIC DIAGRAM of WATER SYSTEM
Symbol Description Symbol Description
Check valve Water pump
Automatic exhaust
valve
Flexible connection
Water filter Expansion tank
Stop valve
Electronic water
processor
Thermometer 3-way valve
Pressure gauge 2-way valve
Heater
Fan coil
Fan coil
Fan coil
Fan coil
Basic requirements
The chilled water pipelines may be connected as per relevant procedure when the unit is installed in place. Such
pipelines shall be free from any foreign matter, and must conform to local piping regulations and rules.
1. Before unit operation, thoroughly flush all chilled water pipelines to ensure that they are free from any foreign
matter. Note: Do not flush any foreign matter into the evaporator.
2. Water must flow into the heat exchanger via the inlet. The opposite water direction through the heat exchanger
may degrade the unit performance, and give rise to fault in flow switch.
3. The water pump installed in the water pipeline system is equipped with a starter, and directly pumps water into
the heat exchanger of the water system.
4. Tubing and connectors must not be mounted on the unit but independently supported.
5. The nozzles and connectors of the heat exchanger shall be easily disassembled for operation, cleaning and
inspection over the evaporator nozzle.
6. The evaporator is provided with a 40-mesh filter, which must be installed at the water inlet of the unit and
insulated (see the above diagram).
7. The heat exchanger ports and the site pipelines shall be flexibly connected to reduce vibration
transmitted to buildings.
8. To facilitate troubleshooting, a thermometer or pressure gauge shall be installed on the water inlet and outlet
pipelines. Pressure or temperature instrument are not provided with the unit and are at users’ own expenses.
9. Drain ports shall be arranged at all low points of the water system to ensure that water in the evaporator and
the system is completely discharged; exhaust valves shall be arranged at all high points to vent air in the
pipelines. The exhaust valves and drain ports are not insulated for easy troubleshooting.
10. All water pipelines in the system exposed to frost shall be thermally insulated.
11. Outdoor chilled water pipelines shall be covered with an auxiliary heating tape and insulated with 20 mm thick
thermal insulation material, so as to avoid frozen or ruptured pipelines due to low temperature. The power
supply of the heating tape shall be equipped with a separate fuse.
12. Where the ambient temperature is below 0°C, or the unit is to idle for a long time, please discharge water from
the unit through the water outlet pipeline connected with the plate heat exchanger of the unit. If no water
discharge is required for the unit in winter, do not cut off the power supply. The fan coil in the water system must
be provided with a 3-way valve to ensure that the water system is smoothly circulated after the winterizing water
pump is started.