Three Ways Valve Control; External Off/On Control - Panasonic WH-MHF09G3E5 Service Manual

12.16 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:
During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side.
o
2 3 ways valve switch On:
During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
o
3 Stop condition:
During stop mode, 3 ways valve will be in switch off position.
o
Indoor Unit
AC230V
* During pump down and force mode, fix 3 ways valve in close condition.
* Recommended Parts : SFA 21/18 (Siemens)

12.17 External OFF/ON Control


Communication circuit between Mono Bloc unit and external controller is as per below.
Panasonic
PCB
C30
0.01µ
16V

Maximum length of communication cable is 20 meter.

Control content:
External Control Switch
ON
ON
OFF
OFF
Spring Return 2 point
NC
6
L
6
L
5
N1
5
N1 4
N2
4
N2
NO
6
L
5
N1
4
N2
5V
4 1
R25
1k
3 2
PC1
R23
10k
G2 G2
Control Panel OFF/ON
ON
OFF
ON
OFF
M
M
12V_4
17
18
R1
ZD2
CN-THERMO
Control Panel Power LED
ON
OFF
ON
OFF
69
SPDT 3 wire
COM
6
L
M
Open
5
N1
Close
4
N2
6: Terminal Board No.
External
Controller
System Status
OFF
OFF
OFF
ON