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.
HEAT
RT
N
COOL
L1
N
L2
L3
TO CONTROL PCB
POWER SUPPLY
3-phase
H
3
C
4
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.
Method B
RT provide the switch signal to unit. user interface FOR SERVICEMAN set ROOM THERMOSTAT and MODE SETTING to
YES
：
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.
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.
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
There are three methods for connecting the thermostat cable (as described in the picture above) and it depends on the application.
V.2
Summary of Contents for ETH220VMA
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