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There are three methods for connecting the thermostat cable
(as described in the picture above) and it depends on the
application.
Method A
RT can control heating and cooling individually, like the
controller for 4-pipe FCU. When the hydraulic module is
connected with the external temperature controller, user
interface FOR SERVICEMAN set ROOM THERMOSTAT to
MODE SET
：
A.1 When unit detect voltage is 12VDC between CL and COM
,the unit operates in the cooling mode.
A.2 When unit detect voltage is 12VDC between HT and COM,
the unit operates in the heating mode.
A.3 When unit detect voltage is 0VDC for both side(CL-COM,
HT-COM) the unit stop working for space heating or cooling.
A.4 When unit detect voltage is 12VDC for both side(CL-COM,
HT-COM) the unit working in cooling mode.
Method B
RT provide the switch signal to unit. User interface FOR
SERVICEMAN set ROOM THERMOSTAT to ONE ZONE
：
B.1 When unit detect voltage is 12VDC between HT and COM,
unit turns on.
B.2 When unit detect voltage is 0VDC between HT and COM,
unit turns off.
Method C
Hydraulic Module is connected with two room thermostat, while
user interface FOR SERVICEMAN set ROOM THERMOSTAT
to DOUBLE ZONE:
C.1 When unit detect voltage is 12VDC between HT and COM
,zone1 turn on.When unit detect voltage is 0VDC between HT
and COM, zone1 turn off.
（
Mode set control
）
（
One zone control
）
（
Double zone control
）
a) Procedure
Connect the cable to the appropriate terminals as shown in
the picture.
Fix the cable with cable ties to the cable tie mountings to
ensure stress relief.
C.2 When unit detect voltage is 12VDC between CL and COM,
zone2 turn on according to climate temp curve. When unit
detect voltage is 0V between CL and COM, zone2 turn off.
C.3 When HT-COM and CL-COM are detected as 0VDC, unit
turn off.
C.4 when HT-COM and CL-COM are detected as 12VDC, both
zone1 and zone2 turn on.
The wiring of the thermostat should correspond to the
settings of the user interface.
Power supply of machine and room thermostat must be
connected to the same Neutral Line .
NOTE
When ROOM THERMOSTAT is not set to NON, the
indoor temperature sensor Ta can’t be set to valid.
Zone 2 can only operate in heating mode, When cooling
mode is set on user interface and zone1 is OFF,“CL” in
zone2 closes, system still keeps 'OFF'. While installation,
the wiring of thermostats for zone1 and zone2 must
be correct.
CL
HT
COM
RT1
POWER IN
RT2
POWER IN
Method C
zone1
zone2
（
Double zone control
）
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SW9
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CL
COM
HT
7) For remote shut down:
CLOSE: SHUT DOWN
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CN4
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CN21
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CN11
CN17
CN30
CN25
CN29
CN42
CN6
CN8
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SW9
CN24
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M1 M2
CN35
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CN38
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CN23
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CN27
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