55
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 (slave 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
Master Slave 1 *4 Slave 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. (THW5)
8
Slave1 circulation pump1 (field supply)
9
Slave1 flow switch (local supply) *2
10 Slave1 3-way valve (local supply) *3
11
Slave1 flow temp. thermistor (THW1)
12 Slave1 return temp. thermistor (THW2)
13 Slave1 ref. liquid temp. thermistor (TH2) *1
14 Slave2 circulation pump1 (local supply)
15
Slave2 flow switch (local supply) *2
16
Slave2 flow temp. thermistor (THW1)
17 Slave2 return temp. thermistor (THW2)
18 Slave2 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 master unit (or hydro box) as the slave
controller.
No.
Component
Wiring
Master Slave 1 *4 Slave 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. (THW5)
8 Slave1 circulation pump1 (local supply)
9
Slave1 flow switch (local supply) *2
10 Slave1 3-way valve (local supply) *3
11
Slave1 flow temp. thermistor (THW1)
12 Slave1 return temp. thermistor (THW2)
13 Slave1 ref. liquid temp. thermistor (TH2) *1
14 Slave2 circulation pump1 (local supply)
15
Slave2 flow switch (local supply) *2
16 Slave2 3-way valve (local supply) *3
17
Slave2 flow temp. thermistor (THW1)
18 Slave2 return temp. thermistor (THW2)
19 Slave2 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 master unit (or hydro box) as the slave
controller.
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>
Summary of Contents for PAC-SIF051B-E
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