39
RT1
POWER
IN
Room thermostat type2 (Low voltage):
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(98
6*
Method A
COOL(CL)
HEAT(HT) COM
COOL(CL)
HEAT(HT)
COM
RT1
POWER IN
RT2
POWER IN
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(98
6*
Method C
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 indoor unit 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.
RT1
POWER
IN
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&/
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+7
(98
6*
Method B
HEAT(HT)
COM
Method C
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.
（
Mode set control
）
（
One zone control
）
（
Double zone control
）
zone1
zone2
（
Mode set control
）
（
One zone control
）
（
Double zone control
）
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6:
&1
6:
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6:
V.2
