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7
Water to Water Heat Pump (WTW)
7.4.3 Wiring for 2-zone temperature control
Connect the pipe work and locally supplied parts according to
the relevant circuit diagram shown "7.5.3 Local system 1".
<Mixing valve>
Connect the signal line to open Port A (hot water inlet port) to
TBO. 2-3 (Open), the signal line to open Port B (cold water
inlet port) to TBO. 2-1 (Close) , and the neutral terminal wire
to TBO. 2-2 (N).
<Thermistor>
• Do not install the thermistors on the mixing tank.
• Install the Zone2 flow temp. thermistor (THW8) near the mix-
ing valve.
• The maximum length of the thermistor wiring is 30 m.
• The length of the optional thermistors are 5 m. If you need to
splice and extend the wirings, following points must be car-
ried out.
1) Connect the wirings by soldering.
2) Insulate each connecting point against dust and water.
Note:
Do not install the thermistors on the mixing tank. This
could affect correct monitoring of flow and return tempera-
tures through each zone.
Install the Zone2 flow temp. thermistor (THW8) near the
mixing valve.
7.4.4 2-zone valve ON/OFF control
Opening /closing 2-way valve provides a simple 2-Zone control.
Flow temperature is common for Zone1 and 2.
1. Pipe work
3
2. DIP switch
Turn DIP switch 3-6 ON.
3. 2-way valve 2a (for Zone1) / 2-way valve 2b (for Zone2)
Electrically wire 2-way valve 2a and 2b to the appropriate
external output terminals. (Refer to "External outputs" in 7.4.2)
4. Room thermostat connection
Heating operation mode
Room temp. control
(Auto adaptation) *3
Compensation curve or flow temp. control
*3 Ensure to install the room thermostat for Zone1 in main room since the Room temp. control for Zone1 is prioritized.
*4 The wireless remote controller can be used as a thermostat.
Zone1
1
4
Zone2
2
Zone1
● Wireless remote controller (option)
● Room temperature thermistor (option)
● Main remote controller (remote position)
● Wireless remote controller (option) *4
● Room temperature thermostat (local supply)
N
L
FTC
1
2
3
TBO.2
Close
N Open
from mixing
A
tank
B
to mixing
tank
1. Zone1 2-way valve 2a (local supply)
2. Zone2 2-way valve 2b (local supply)
3. Water circulation pump 2 (local supply) *1
4. By-pass valve (local supply) *2
*1 Install according to system in the field.
*2 For safety protection, it is recommended to in-
stall a auto-operational (eg. mechanical spring
ie. not manual valve) by-pass valve.
Note:
Freeze stat function is deactivated whilst this
control is ON. Use anti-freeze solution to avoid
freezing, if necessary.
Zone2
● Wireless remote controller (option)
● Wireless remote controller (option) *4
● Room temperature thermostat (local supply)
to Zone2
heat emitter
Motorized
mixing valve
from Zone2
heat emitter
B-217
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