48
System 2: Heating/Cooling & DHW system
• Install DHW tank toward the outdoor unit , relative to the low loss header.
• Wire 3-way valve or 2-way valve 1, 2 to FTC (sub unit).
• LP mode uses assistance of electric heater. Place an immersion heater on the
DHW circuit.
• Install a low loss header (local supply).
• Install booster heater toward the local system, relative to the low loss header.
No.
Component
Wiring
Main
Sub 1 *4
Sub 2
1 Booster heater (local supply)
2 Circulation pump1 (local supply)
3 Flow switch1 (local supply) *2
4 Immersion heater (local supply)
5 Flow temp. thermistor (THW1)
6 Return temp. thermistor (THW2)
7 Tank water temp. (THW5B)
8
Sub1 circulation pump1 (field supply)
9
Sub1 flow switch (local supply) *2
10 Sub1 3-way valve (local supply) *3
11
Sub1 flow temp. thermistor (THW1)
12 Sub1 return temp. thermistor (THW2)
13 Sub1 ref. liquid temp. thermistor (TH2) *1
14 Sub2 circulation pump1 (local supply)
15
Sub2 flow switch (local supply) *2
16
Sub2 flow temp. thermistor (THW1)
17 Sub2 return temp. thermistor (THW2)
18 Sub2 ref. liquid temp. thermistor (TH2) *1
*1 When the outdoor unit is split type, TH2 needs to be installed. <Fig. 9.2.1>
*2 For safety protection, it is recommended to install a flow switch.
*3 The use of two 2-way valves can perform the same function as a 3-way valve.
*4 DHW operation requires to use the main unit (or hydrobox) as the sub
controller.
No.
Component
Wiring
Main
Sub 1 *4 Sub 2 *4
1 Booster heater (local supply)
2 Circulation pump1 (local supply)
3 Flow switch1 (local supply) *2
4 Immersion heater (local supply)
5 Flow temp. thermistor (THW1)
6 Return temp. thermistor (THW2)
7 Tank water temp. (THW5B)
8 Sub1 circulation pump1 (local supply)
9
Sub1 flow switch (local supply) *2
10 Sub1 3-way valve (local supply) *3
11
Sub1 flow temp. thermistor (THW1)
12 Sub1 return temp. thermistor (THW2)
13 Sub1 ref. liquid temp. thermistor (TH2) *1
14 Sub2 circulation pump1 (local supply)
15
Sub2 flow switch (local supply) *2
16 Sub2 3-way valve (local supply) *3
17
Sub2 flow temp. thermistor (THW1)
18 Sub2 return temp. thermistor (THW2)
19 Sub2 ref. liquid temp. thermistor (TH2) *1
*1 When the outdoor unit is split type, TH2 needs to be installed. <Fig. 9.2.1>
*2 For safety protection, it is recommended to install a flow switch.
*3 The use of two 2-way valves can perform the same function as a 3-way valve.
*4 DHW operation requires to use the main unit (or hydrobox) as the sub
controller.
en
9. Multiple outdoor units control
7
4
5
10
1
6
2
3
11
12
8
9
16
17
14
15
13
18
Outdoor unit
Outdoor unit
Low loss header
(local supply)
DHW tank
Heating/
Cooling
<Fig. 9.2.3>
7
4
5
10
1
6
2
3
16
11
12
8
9
17
18
14
15
13
19
Outdoor unit
Outdoor unit
Low loss header
(local supply)
DHW tank
Heating/
Cooling
<Fig. 9.2.4>
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