37
Room thermostat type1(RT1)(High voltage): “POWER IN” provide the working voltage to the RT, doesn’t provide the voltage to the
RT connector directly. Port “15 L1” provide the 220V voltage to the RT connector. Port “15 L1” connect from the unit main power
supply port L of 1- phase power supply, L2 port of 3-phase power supply.
Room thermostat type2(RT2)(Low voltage): “POWER IN” provide the working voltage to the RT.
Method B
RT provide the switch signal to unit. user interface FOR SERVICEMAN set ROOM THERMOSTAT and MODE SETTING to
YES
：
Method A
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 THERMOSTAT and ROOM MODE SETTING to
YES
：
A.1 When unit detect voltage is 230VAC between C and N ,the unit operates in the cooling mode.
A.2 When unit detect voltage is 230VAC between H and N, the unit operates in the heating mode.
A.3 When unit detect voltage is 0VAC for both side(C-N, H-N) the unit stop working for space heating or cooling.
A.4 When unit detect voltage is 230VAC for both side(C-N, H-N) the unit working in cooling mode.
There are three methods for connecting the thermostat cable (as described in the picture above) and it depends on the application.
Voltage
Maximum running current(A)
Wiring size(mm
2
)
220-240VAC
0.2
0.75
There are two optional connect method depend
on the room thermostat type.
NOTE
2) For room thermostat
Method B
RT1
COOL
POWER
IN
HEAT
15
C
H
4
3
L1
15
C
H
4
3
L1
Method A
RT1
POWER
IN
Method C
15
C
H
4
3
L1
RT1
POWER IN
RT1
POWER IN
Method B
RT2
COOL
POWER
IN
HEAT
HT
CL COM
HT
CL COM
HT
CL COM
Method A
RT2
POWER
IN
Method C
RT1
POWER IN
RT1
POWER IN
a. type 1(RT1) (High voltage)
b. type 2(RT1) (Low voltage):
in main control board of hydraulic module CN31
POWER SUPPLY
3-phase
HEAT
RT
N
COOL
TO CONTROL PCB
H
3
C
4
L1
L1
L2
L3
N
L1
L2
L3
N
38
B.1 When unit detect voltage is 230VAC between H and N, unit turn on.
B.2 When unit detect voltage is 0VAC between H and N, unit turn off.
Wiring of the 3-way valve is different for NC(normal close) and NO (normal open). Before wiring, read the Installation
& Owner's manual for the 3-way valve carefully and install the valve as showed in the picture. Make sure to connect it
to the correct terminal numbers.
NOTE
3) For 3-way value SV3
Control port signal type
Voltage
Maximum running current(A)
Wiring size(mm
2
)
Type 1
220-240VAC
0.2
0.75
SV1
1ON
5
1OFF
6
N
16
SV2
2ON
7
2OFF
8
N
17
SV3
3ON
19
3OFF
20
N
18
Procedure
Connect the cable to the appropriate terminals as shown in the picture.
Fix the cable reliably.
P_c
N
9
21
PUMP_c
CONTROL SIGNAL
OUTPUT
(For zone 2 pump)
P_o
N
PUMP_o
CONTROL SIGNAL
OUTPUT
(For zone 1 pump or
outside circulating pump )
10 22
P_s
N
PUMP_s
CONTROL SIGNAL
OUTPUT
(For solar pump)
11 23
P_d
N
PUMP_d
CONTROL SIGNAL
OUTPUT
(For DHW tank
circulating pump)
12 24
4) For different functions pumps
：
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.
When ROOM THERMOSTAT is set to YES, the indoor temperature sensor Ta can’t be set to valid, unit running only
according to T1.
NOTE
Method C
Hydraulic module is connected with two external temperature controllers, while user interface FOR SERVICEMAN set DUAL
ROOM THERMOSTAT to YES:
C.1 When unit detect voltage is 230VAC between H and N ,the MAIN side turn on.When unit detect voltage is 0VAC between
H and N, the MAIN side turn off.
C.2 When unit detect voltage is 230VAC between C and N, the ROOM side turn on according to climate temp curve. When unit
detect voltage is 0V between C and N, the ROOM side turn off.
C.3 When H-N and C-N are detected as 0VAC, unit turn off.
C.4 when H-N and C-N are detected as 230VAC, both MAIN and ROOM side turn on.
The wiring of the thermostat should correspond to the settings of the user interface. Refer to 10.7 Field setting/Room
Thermostat.
Power supply of machine and room thermostat must be connected to the same Neutral Line and (L2) Phase Line(for
3-phase unit only).
NOTE
121
120
Summary of Contents for MONO KHC-22RX3
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