156
Cooling
Heating
Siemen RAA20
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
Indoor Unit
9 L (label)
10
11
12
Y1 (label)
Y2 (label)
9 : Terminal Board No.
Control Content:
External room thermostat control activate only when remote thermostat connection select YES by Indoor control
panel.
When indoor running heat mode, refer thermo On/Off from heating line feedback. And when indoor running cool
mode, refer thermo On/Off from cooling line feedback.
Heat pump Off immediately when receive thermo off feedback.
14.22 Three Ways Valve Control
Purpose:
- 3 ways valve is used to change flow direction of hot water from heat pump between heating side and tank side.
Control contents:
1 3 ways valve switch Off:
o During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side.
2 3 ways valve switch On:
o During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
3 Stop condition:
o During stop mode, 3 ways valve will be in switch off position.
L
N2
Indoor Unit
N1
Spring Return 2 point SPDT 3 wire
3
5
M
L
1
N1
3
N2
COM
Open
Close
5
6: Terminal Board No.
M
L
NC
1
N1
3
N2
5
M
L
NO
1
N1
3
N2
5
1
AC230V
* During pump down and force mode, fix 3 ways valve in close condition.
* Recommended Parts : SFA 21/18 (Siemens)
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