Two Ways Valve Control; External Off/On Control - Panasonic WH-ADC0916G9E8 WH-UX09FE8 Service Manual

12.18 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:
During stop mode, fix 2 ways valve in close condition.
a.
Indoor Unit
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)

12.19 External OFF/ON Control


Communication circuit between indoor unit and external controller is as per below.
R23
10k

Maximum length of communication cable is 20 meter.

Control content:
External Control Switch
ON
ON
OFF
OFF
Spring Return 2 point
NC
1
L
1
L
3
N1
3
5
N1
N2
5
N2
NO
1
L
3
N1
5
N2
PCB
5V
4 1
3 2
PC1
G2 G2
Control Panel OFF/ON
ON
OFF
ON
OFF
M
M
12V_4
Terminal
Board
1
4
R1
3
5
ZD2
MA1Z
CN-THERMO
Control Panel Power LED
ON
OFF
ON
OFF
85
SPDT 3 wire
COM
1
L
M
Open
3
N1
Close
5
N2
3: Terminal Board No.
System Status
ON
OFF
OFF
OFF