MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Installation 177
3. Water system installation
3.1 Basic requirements of connection of chilled water pipes
CAUTION:
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After the unit is in place, chilled water pipes can be laid.
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The relevant installation regulations should be abided with when conducting connection of water pipes.
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All water pipes must conform to local rules and regulations of pipeline engineering.
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The size of water pipe should be the same as or larger than the connector size of the unit (DN32).
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The heat exchanger of the unit is double-pipe heat exchanger. There are different operation and maintenance
methods between the double-pipe heat exchanger double-pipe heat exchanger and the other heat
exchangers.
1) All connected water pipes should be thoroughly flushed, and cannot be cleaned after connected to the
double-pipe heat exchanger of the unit, for in case any impurity been flushed into the heat exchanger. After
connection, all the water pipes should be washed down, and no any impurity left.
2) Water must enter the double-pipe heat exchanger through the inlet; otherwise the performance of the unit
will decline.
3) The inlet pipe of each double-pipe heat exchanger in the unit must be provided with a target flow switch, to
realize flow-break protection for the unit. Both ends of the water flow switch must be supplied with horizontal
straight pipe sections whose diameter is 5 times that of the inlet pipe. The water flow switch must be installed
in strict accordance with “Installation & Regulation Guide for Water Flow Switch” (See Section 4-5).The wires
of the water flow switch should be led to the electric cabinet through shielded cable (see Electric Wiring section
for details). After the pipelines are installed, the water flow switch will be set properly according to the rated
water flow of the unit.
4) The pump installed in the water system should be equipped with starter and should be controlled by the unit.
The unit only supplies the on, off controlling signal of water pump, and do not supply the power for the water
pump.
5) The pipes and their ports must be independently supported but should not be supported on the unit.
6) The pipes and their ports of the double-pipe heat exchanger should be easy to disassemble for operation
and cleaning, as well as inspection of port pipes of the evaporator.
7) The inlet of the double-pipe heat exchanger should be provided with a water filter with more than 40 meshes
per inch (in the accessories). The filter should be installed near to the inlet port as much as possible, and be
under heat preservation. Periodically clean the water filter according to the blocking condition of the filter.
8) The flexible connectors must be mounted between the double-pipe heat exchangers and the on-site pipes,
to reduce transfer of vibration to the building.
9) To facilitate maintenance, the inlet and outlet pipes should be provided with thermometer or manometer. The
unit is not equipped with pressure and temperature instruments, so they need to be purchased by the user.
10) All low positions of the water system should be provided with drainage valves, to drain water in the heat
exchanger of water side and the system completely; and all high positions should be supplied with discharge
valves, to facilitate expelling air from the pipeline. The discharge valves and drainage valves should not be
under heat preservation, to facilitate maintenance.
11) All possible water pipes in the system to be chilled should be under heat preservation.
12) When the unit will not be used for a long time, water inside the unit should be drained and cut off the power.
If the unit is not drained in winter, then the double-pipe heat exchanger and the water pipes system of the unit
might be freezing and cracking under low temperature.
13) The rated water flow volume of different models is as follow: