28
8.6.10 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 and
KEM-60 DRS4.
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.
unit
(n-1#)
unit (0#)
unit (1#)
terminal
Tw
inlet water
outlet water
water pump
one-way valve
Fig.8-25 Installation of single water pump
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 (0#)
unit (1#)
terminal
Tw
inlet water
outlet water
water pump
one-way valve
Fig.8-26 Installation of multiple water pump
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.
9 STRAT-UP AND CONFIGURATION
9.1 Initial start-up at low outdoor ambient temperatures
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.
To do so, the lowest water flow set temperature can be decreased to a value between 25°C and 35°C by adjusting the FOR
SERVICEMAN.
Refer to "FOR SERVICEMAN/special function/preheating for floor"
9.2 Points for attention prior to trial run
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
settings 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.
