Midea MGBT-D25W/DN1, Руководство пользователя

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R410a tropical air-cooled scroll chiller unit 60Hz MCAC-ATSM-2014-09
132 Installation
4
The pump installed in the water pipeline system should be equipped with starter. The pump will directly press
water into the heat exchanger of the water system.
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 heat exchanger should be easy to disassemble for operation and cleaning, as
well as inspection of port pipes of the evaporator.
7
The evaporator should be provided with a filter with more than 40 meshes per inch at site. The filter should be
installed near to the inlet port as much as possible, and be under heat preservation.
8
The by-pass pipes and by-pass valves as shown in th
e figure of “Connection drawing of pipeline system” must
be mounted for the heat exchanger, to facilitate cleaning of the outside system of water passage before the unit
is adjusted. During maintenance, the water passage of the heat exchanger can be cut off without disturbing
other heat exchangers.
9
The flexible ports should be adopted between the interface of the heat exchanger and on-site pipeline, to
reduce transfer of vibration to the building.
10
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.
11
All low positions of the water system should be provided with drainage ports, to drain water in the evaporator
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 ports should not be under heat preservation,
to facilitate maintenance.
12
All possible water pipes in the system to be chilled should be under heat preservation, including inlet pipes and
flanges of the heat exchanger.
13
The outdoor chilled water pipelines should be wrapped with an auxiliary heating belt for heat preservation, and
the material of the auxiliary heat belt should be PE, EDPM, etc., with thickness of 20mm, to prevent the
pipelines from freezing and thus cracking under low temperature. The power supply of the heating belt should
be equipped with an independent fuse.
14
When the ambient temperature is lower than 2
℃
, and the unit will be not used for a long time, water inside the
unit should be drained. If the unit is not drained in winter, its power supply should not be cut off, and the fan
coils in the water system must be provided with three-way valves, to ensure smooth circulation of the water
system when the anti-freezing pump is started up in winter.
15 The common outlet pipelines of combined units should be provided with mixing water temperature sensor.
Warning:
For the water pipeline network including filters and heat exchangers, dreg or dirt may seriously damages the
heat exchangers and water pipes.
The installation persons or the users must ensure the quality of chilled water, and de-icing salt mixtures and
air should be excluded from the water system, since they may oxidize and corrode steel parts inside the heat
exchanger.
2.2 Water Quality
Water quality control
When industrial water is used as chilled water, little
furring may occur; however, well water or river water,
used as chilled water, may cause much sediment,
such as furring, sand, and so on. Therefore, well
water or river water must be filtered and softened in
softening water equipment before flowing into
chilled water system. If sand and clay settle in the
evaporator, circulation of chilled water may be blocked, and thus leading to freezing accidents; if
hardness of chilled water is too high, furring may
occur easily, and the devices may be corroded.
Therefore, the quality of chilled water should be
analyzed before being used, such as PH value,
conductivity,
concentration of chloride ion,
concentration of sulfide ion, and so on.