27
8.5.15 Wiring of “HEAT/COOL” weak electric port
The remote function of “ON/OFF” must be set by DIP switch. The
remote function of “ON/OFF” and “HEAT/COOL” is effective when
S5-4 for KEM-30 DNS3 and KEM-60 DNS3 or S5-3 for KEM-90
DNS3 is chosen ON, at the same time, the wire controller is out of
control.
Corresponding parallel connect the “HEAT/COOL” port of the main
unit’s electric control box,then, connect the “ON/OFF” signal (provide
by user) to the “HEAT/COOL” port of main unit as follows.
Wiring method: When KEM-30 DNS3 and KEM-60 DNS3 enable
“HEAT/COOL” control, short the “HEAT/COOL” ports on the main
control board.
When KEM-90 DNS3 enables “HEAT/COOL” control, short the
terminal block XT2 at 14 and 23 inside the electric control box.
0# electric
control box
“HEAT/COOL” port
COOL
Power (DC 12V
)
Main control board is provided
0# electric
control box
“HEAT/COOL” port
HE
AT
Power (DC 12V
)
Main control board is provided
Fig. 8-22 Wiring of “HEAT/ COOL” weak electric port
8.5.16 Wiring of “ALARM” port
Connect the device provided by user to the “ALARM” ports of the
module units as follows.
electric control box
“ALARM” port
Device provided by user
Fig. 8-23 Wiring of “ALARM” port
If the unit is operating unnormally, the ALARM port is closed,
otherwise, the ALARM port is not closed.
The ALARM ports for KEM-30 DNS3, KEM-60 DNS3 and KEM-90
DNS3 are on the main control board. See the wiring nameplate for
details.
8.5.17 Control system and installation precautions
a. Use only shielded wires as control wires. Any other type of wires
may produce a signal interference that will cause the units to
malfunction.
Fig. 8-24-1 Control system and installation precaution (a)
b. The shielding nets at both ends of the shielded wire must be
grounded. Alternatively, the shielding nets of all shielded wires
are interconnected and then connected to earth through or one
metal plate.
Unit
Fig. 8-24-2 Control system and installation precaution (b)
c. Do not bind the control wire, refrigerant piping and power cord
together. When the power cord and control wire are laid parallel,
they should be kept at a distance of more than 300 mm to prevent
signal source interference.
Unit
Fig. 8-24-3 Control system and installation precaution (c)
d. Pay attention to the polarity of the control wire when conducting
wiring operations.
Fig. 8-24-4 Control system and installation precaution (d)
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