Room thermostat type2 (Low voltage):
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DIS1
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Method A
(Mode set control)
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DIS1
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S3
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Method B
(One zone control)
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S1
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HT
CL
COM
POWER
IN
RT1
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HT
COM
POWER
RT1
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Method C
(Double zone control)
There are three methods for connecting the thermostat cable
(as described in the picture above) and it depends on the
application.
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Method A
(Mode set control)
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RT can control heating and cooling individually, like the
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controller for 4-pipe FCU. When the indoor unit is connected
with the external temperature controller, user interface FOR
SERVICEMAN set ROOM THERMOSTAT to MODE SET:
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A.1 When unit detect voltage is 12VDC between CL and COM
,the unit operates in the cooling mode.
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A.2 When unit detect voltage is 12VDC between HT and COM,
the unit operates in the heating mode.
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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,
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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)
IN
Indoor unit 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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S1
S2
DIS1
S3
S4
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COM
HT
POWER IN
RT1
RT2
zone1
zone2
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CL
POWER IN