WH-ADC0916H9E8, WH-UD09HE8, WH-UD12HE8, WH-UD16HE8, WH-UX09HE8, WH-UX12HE8, WH-UX16HE8, WH-UQ09HE8, WH-UQ12HE8, WH-UQ16HE8 - Panasonic Air Conditioner Service Manual (repair manual). Page 112

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112 
11.23  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. 
 
 
 
* During pump down mode, fix 2 ways valve in close condition. 
* During force mode, open 2 ways valve. 
 
* Recommended Parts : SFA 21/18 (Siemens) 
11.24   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 
Control Panel OFF/ON 
Control Panel Power LED 
System Status 
ON ON ON ON 
ON OFF OFF OFF 
OFF ON  ON OFF 
OFF OFF OFF OFF 
 
 
 
 
 
 
 
 
 
 
 
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
External
Controller
Panasonic
PCB
CN-THERMO
5V
12V
1
2
mico

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