MCAC-CTSM-2018-1
Flooded type water cooled screw chiller (MIC)
79
system.
13) The drain connection is arranged on the evaporator cylinder. The drain outlet has been
equipped with a 1/2’’ plug.
14) To expel the air from water system, install an automatic discharge valve at the highest point of
local water pipe and the horizontal pipe should be tilted up for about 1/250 degrees.
15) The thermometer and pressure gauge are arranged on the straight pipe sections of the water
inlet pipeline and drain pipeline, and they should be installed far away from the elbows. The
pressure gauge installed must be vertical to the water pipe. The installation of the thermometer
must ensure that its temperature probe can be inserted into the water pipe directly.
16) Each low point must be fitted with a drain connection to drain the remaining water in the system.
Before operating the unit, connect the stop valves to the drain pipeline, near the water inlet
connection and drain connection. The by-pass pipeline must be installed between the water
inlet pipe and drain pipe of the evaporator, so it is convenient for cleaning and maintenance.
Flexible connections can reduce vibration transfer.
17) Insulate the chilled water pipeline and expansion tank. Leave enough room for valve
connections.
18) After the air-tightness test is carried out, and the insulation layer is applied on the pipeline,
avoid heat transfer and surface condensation by covering the insulation layer with a
moisture-proof seal.
19) Any water piping to the unit must be protected to prevent freezing. There are reserved
terminals for the auxiliary electrical heater. Logic in PCB will transmit an ON/OFF signal by
checking the leaving evaporator water temperature.
Note: The unit only supplies the ON/OFF signal, but not the 220V power. If a separate
disconnect is used for the 220V supply to the cooler heating cable, it should be clearly marked
so that it does not accidentally shut off during cold seasons.
20) If the unit is used as a replacement chiller on a previously existing piping system, the system
should be thoroughly flushed prior to unit installation. Regular chilled water analysis and
chemical water treatment is recommended immediately on equipment start-up.
21) Power on the chilled water pump, and inspect its rotation direction. The correct rotation
direction must be clockwise; if not, re-inspect the wiring of the pump.
22) Start the chilled water pump to circulate water flow. Inspect the water pipelines for water
leakage and dripping.
23) Commission the chilled water pump. Observe whether the water pressure is stable. Observe
the pressure gauges at the pump inlet and outlet, and the readings of the pressure gauges and
the pressure difference between the inlet and outlet change slightly when the water pressure is
stable. Observe whether the operating current of the pump is within the range of rated
operating current; inspect whether the resistance of the system is too large if the difference
between the operating current and rated value is too big; eliminate the system failures until the
