Two Ways Valve Control; External Off/On Control - Panasonic WH-MXC09J3E8 Service Manual

13.24 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)

13.25 External OFF/ON Control


Communication circuit between indoor unit and external controller is as per below.

Maximum length of communication cable is 50 meter.

Control content:
External Control Switch
ON
ON
OFF
OFF
Spring Return 2 point
NC
L
L
N1
N1
N2
N2
NO
L
N1
N2
5V
12V
mico
1
2
Panasonic
PCB
Control Panel OFF/ON
ON
OFF
ON
OFF
M
M
External
Controller
CN-THERMO
Control Panel Power LED
ON
OFF
ON
OFF
121
SPDT 3 wire
COM
L
M
Open
N1
Close
N2
System Status
ON
OFF
OFF
OFF