Flooded type water cooled screw chiller (PCB Control)
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decreasing the performance of the evaporator.
6)
A strainer should be placed for enough upstream to prevent cavitation at the pump inlet (consult
pump manufacturer for recommendations). The use of a strainer will prolong pump life and help
maintain high system performance levels
7)
The flushing and insulation of the water pipelines shall be carried out before it is connected with
the unit, so as to prevent dirt from damaging the unit.
8)
The design water pressure of the water chamber is 1.0Mpa. Use of the water chamber shall be
not exceeding this pressure in order to avoid damaging the evaporator.
9)
Do not load the weight of water pipe onto the unit. When water inlet/outlet are connected with
corresponding water pipe, soft connection such as rubber joint should be used to avoid the
transmission and inter-disturbance of vibration and noise to avoid the vibration which may be
transmitted to indoor side.
10) In close loop water system, to diminish the impact on water pipe because of the expansion or
contraction of water volume and to avoid the influence caused by supplementing water
pressure, water return side should be fitted with an expansion water tank. The expansion tank
shall be installed 1~1.5m higher than the system, and its capacity accounts about 1/10 of the
water amount in the whole system.
11) The drain connection is arranged on the evaporator cylinder. The drain outlet has been
equipped with a 1/2’’ plug.
12) In order to expel the air from water system, install an automatic discharge valve on the highest
place of local water pipe and the horizontal pipe should be up tilted for about 1/250 degree.
13) The thermometer and pressure gauge are arranged on the straight pipe sections of the water
inlet pipeline and drain pipeline, and their installation places shall be far away from the elbows.
The pressure gauge installed shall be vertical to the water pipe, and the installation of the
thermometer shall ensure that its temperature probe can be inserted into the water pipe
directly.
14)
Each low point shall be fitted with a drain connection so as to drain the remaining water in the
system. Before operating the unit, connect the stop valves to the drain pipeline, respectively
near the water inlet connection and drain connection. The by-pass pipeline shall be provided
between the water inlet pipe and drain pipe of the evaporator, convenient for cleaning and
maintenance. Use of flexible connections can reduce vibration transfer.
15) The chilled water pipeline and expansion tank shall be subjected to insulation treatment, and
the maintenance and operation part shall be reserved on the valve connections.
16) After the air-tightness test is carried out, and the insulation layer is applied on the pipeline, so
as to avoid heat transfer and surface condensation; the insulation layer shall be covered by
moisture-proof seal.
17)
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 ON/OFF signal by
