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HT-COM-CL - Room thermostat (Low voltage)
There are three methods for connecting the thermostat.
•
Room thermostat method A (mode set control)
To activate this function set the service parameter 6.1 "Room thermostat" = 1
(mode setting) refer to "9.2 Service parameters table" on page 117.
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
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working in cooling mode.
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DIS1
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Method A
（Mode set control）
•
Room thermostat method B (one zone control)
To activate this function set the service parameter 6.1 "Room thermostat" = 2 (one
zone) refer to "9.2 Service parameters table" on page 117.
B.1 When unit detect voltage is 12VDC between HT and COM, unit turns on.
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B.2 When unit detect voltage is 0VDC between HT and COM, unit turns off.
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Method B
（One zone control）
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EN
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S1
S2
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0
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HEAT(HT) COM
COOL(CL)
POWER
IN
RT1
fig. 33 -
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S1
S2
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0
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HEAT(HT)
COM
POWER
IN
RT1
fig. 34 -
Cod. 3541V941 - Rev. 04 - 05/2022
•
Room thermostat method C (double zone control)
To activate this function set the service parameter 6.1 "Room thermostat" = 3 (dou-
ble zone) refer to "9.2 Service parameters table" on page 117.
C.1 With 12VDC voltage between HT and COM, zone1 turns on. With 0VDC volt-
age between HT and COM, zone1 turns off.
C.2 With 12VDC voltage between CL and COM, zone2 turns. When 0VDC voltage
between CL and COM, zone2 turn off.
C.3 With 0VDC voltage for both sides (HT-COM and CL-COM), the unit turns off.
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C.4 With 12VDC voltage for both sides (HT-COM and CL-COM), both zone1 and
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zone2 turn on.
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1
HEAT(HT)
Method C
（Double zone control）
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 .
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.
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OMNIA S 3.2
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S1
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COM
COOL(CL)
POWER IN
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RT2
zone1
zone2
fig. 35 -
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POWER IN
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