39
RT1
POWER
IN
Room thermostat type2 (Low voltage):
30
29
32
25
26
27
28
31
7
12
11
10
9
18
8
7
5
23
22
24
1
2
13
3
4
6
20
14
15
17
19
16
21
6
8
9
10
5
4
3
2
1
CN4
CN22
CN5
S3
DIS1
CN24
CN1
CN2
CN6
CN8
CN13
CN15
CN16
CN18
CN28
S2
CN42
CN21
S1
S4
CN11
CN7
CN17
CN19
CN30
CN35
CN14
CN31
CN36
CN25
CN29
CN40
CN41
CL
COM
HT
EVU
SG
Method A
COOL(CL)
HEAT(HT) COM
COOL(CL)
HEAT(HT)
COM
RT1
POWER IN
RT2
POWER IN
30
29
32
25
26
27
28
31
7
12
11
10
9
18
8
7
5
23
22
24
1
2
13
3
4
6
20
14
15
17
19
16
21
6
8
9
10
5
4
3
2
1
CN4
CN22
CN5
S3
DIS1
CN24
CN1
CN2
CN6
CN8
CN13
CN15
CN16
CN18
CN28
S2
CN42
CN21
S1
S4
CN11
CN7
CN17
CN19
CN30
CN35
CN14
CN31
CN36
CN25
CN29
CN40
CN41
CL
COM
HT
EVU
SG
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
30
29
32
25
26
27
28
31
7
12
11
10
9
18
8
7
5
23
22
24
1
2
13
3
4
6
20
14
15
17
19
16
21
6
8
9
10
5
4
3
2
1
CN4
CN22
CN5
S3
DIS1
CN24
CN1
CN2
CN6
CN8
CN13
CN15
CN16
CN18
CN28
S2
CN42
CN21
S1
S4
CN11
CN7
CN17
CN19
CN30
CN35
CN14
CN31
CN36
CN25
CN29
CN40
CN41
CL
COM
HT
EVU
SG
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
）
CN32
SW9
CN32
SW9
CN32
SW9
