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12.21 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
M
L
N1
N2
COM
Open
Close
M
L
NC
N1
N2
M
L
NO
N1
N2
AC230V
* During pump down and force mode, fix 3 ways valve in close condition.
* Recommended Parts : SFA 21/18 (Siemens)
12.22 Two Ways Valve Control
Functionality of 2 ways valve:
Use to allow hot water to floor heating panel or block cold water to floor heating panel.
Control contents:
1 When indoor running in heat mode, OPEN the 2 ways valve.
2 When indoor running in cool mode, CLOSE the 2 ways valve.
3 Stop condition:
a. During stop mode, fix 2 ways valve in close condition.
L
N2
Indoor Unit
N1
Spring Return 2 point SPDT 3 wire
M
L
N1
N2
COM
Open
Close
M
L
NC
N1
N2
M
L
NO
N1
N2
AC230V
* During pump down mode, fix 2 ways valve in close condition.
* During force mode, open 2 ways valve.
* Recommended Parts : SFA 21/18 (Siemens)
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