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COM
HT
Method C
（Double zone
control）
POWER IN
RT1
zone1
There
are
three
methods
thermostat cable (as
described
above) and it depends on the application.
Method A (Mode set control)
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 (One zone control)
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 (Double zone control)
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.
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CL
POWER IN
RT2
zone2
for
connecting
the
in
the
picture
35
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.
NOTE
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 .
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.
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.
7) For remote shut down:
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CLOSE: SHUT DOWN
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V.1
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