MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Installation 181
flow switches.
4) Special grounding screws should be used for earth connection. Bolts should not be installed or removed at
will; otherwise flow switches may suffer deformation and failure.
5) Flow switches have been set at minimal flow value prior to ex-factory. They should not be adjusted below
the ex-factory setting value, or they may suffer failure. After installing flow switches, please press the flow
switch lever several times to check them. When the lever is found not to respond with “clatter”, rotate the screw
in a clockwise direction, until “clatter” occurs.
6) Be sure to determine the model of target slice according to the rated flow of the unit, the diameter of the
outlet pipe and the adjustment range of the target slice of the flow switch. Besides, the target slice should not
contact with other restrictors in the pipeline or on the inner wall of the pipeline, or the flow switch cannot be
reset normally.
3.5.5. Determine whether the flow switch and the system connected with it are in good operation according to
the measured value by flow meter, namely, when the measured value on flow meter is less than 50% of rated
water flow of the unit, the water flow controller should be cut off and observed for 3 working periods, and it
should be covered with flow switch shell timely.
3.6 Operations and maintenance of double-pipe heat exchanger
3.6.1 Operations of double-pipe heat exchanger
1) Please note that correctly install the water inlet and outlet pipes. The thread of water inlet and outlet are
inner thread G1-1/4.
2) For the double-pipe heat exchanger is internal thread copper pipe, and for avoiding the impurities enter into
and affect the performance then cause corrosion of the double-pipe heat exchanger, it must
be installed the water filter (accessory) near the water inlet pipes of the unit.
3) Please use water pipes which conform to local rules and regulations of pipeline engineering. The size of
water pipe should not smaller than the connector size of the unit (DN32).
4) Periodically clean the water filter according to the water quality situation and the blocking condition of the
filter. Otherwise, it might damage the filter screen of the water filter because of the abnormal pressure.
5) When the unit will not be used for a long time in winter, water inside the double-pipe heat exchanger and the
water pipes should be drained out in case for being frozen. The water inside the double-pipe heat exchanger
can be drained out by its drainage valve, the drain age valve position as Fig.3-1 display. The user can take
down the front plate and open the drainage valve for water draining, and also can without taking down the front
plate then use a straight screwdriver to go through the small hole in the front plate and open the drainage for
water draining, the small hole position as Fig.3-5 display.
6) According to the different water quality the situations of double-pipe heat exchanger and water system
pipelines are different. For removing the scale, it is needed to periodically clean the double-pipe heat
exchanger and water system pipelines. It is suggested that set isolating valves in the suitable places during
water system installation and it is convenient to connect the cleaning system for cleaning.