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8.5.10 Installation of single or multiple
water pumps
1) DIP switch
The choice of DIP switch see Table 8-5 in detail when single
or multiple water pumps are installed for KEM-30 DRS4.1 and
KEM-60 DRS4.1 and KEM-90 DRS5.
Pay attention to the following problems:
a. If the DIP switch is inconsistent, and the error code is FP, the
unit is not allowed to operate.
b. Only the main unit has the water pump output signal when
single water pump installed, auxiliary units has no water pump
output signal.
c. The water pump control signal is available for both the main
unit and auxiliary units when multiple pumps installed.
2) Installation of water pipe system
a. Single water pump
Piping does not require a one-way valve when single water
pump is installed, refer to figure as follow.
3) Electric wiring
Only the main unit requires wiring when single water pump
installed, auxiliary units do not require wiring. All of the main unit
and auxiliary units require wiring when multiple water pumps
installed.For specific wiring, see figure 8-18.
b. Multiple water pumps
Each unit is required to install a one-way valve when multiple
pumps are installed, refer to figure as follow.
unit
(n-1#)
unit
(1#)
unit
(0#)
inlet water
water pump
Fig.8-29 Installation of single water pump
terminal
Tw
outlet water
unit
(n-1#)
unit
(1#)
unit
(0#)
water pump
inlet water
one-way valve
Fig.8-30 Installation of multiple water pump
terminal
Tw
outlet water
9.1 Initial start-up at low outdoor ambient temperatures
9.2 Points for attention prior to trial run
9 STRAT-UP AND CONFIGRUATION
During initial start-up and when water temperature is low, it is important that the water is heated gradually. Failure to do so
may result in concrete floors cracking due to rapid temperature change. Please contact the responsible cast concrete building
contractor for further details.
1) After the water system pipeline is flushed several times, please make sure that the purity of water meets the requirements;
the system is re-filled with water and drained, and the pump is started up, then make sure that water flow and the pressure at
the outlet meet the requirements.
2) The unit is connected to the main power 12 hours before being started up, to supply power to the heating belt and pre-heat
the compressor. Inadequate pre-heating may cause damages to the compressor.
3) Setting of the wired controller. See details of the manual concerning setting contents of the controller, including such
basic Zsettings as refrigerating and heating mode, manual adjustment and automatic adjustment mode and pump mode.
Under normal circumstances, the parameters are set around standard operating conditions for trial run, and extreme working
conditions should be prevented as much as possible.
4) Carefully adjust the target flow controller on the water system or the inlet stop valve of the unit, to make the water flow of the
system be 90% of the water flow specified in troubleshooting table.
Summary of Contents for KEM-90 DRS5
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