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  Communication circuit between indoor unit and external controller is as per below. 
 

External
Controller

Panasonic

PCB

CN-THERMO

5V

12V

1
2

mico

 

 

  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 

 
Remocon Screen Display and Control Detail: 
 

REMOTE

ON

ON

ON

ON

OFF

OFF

UNIT

OFF

OFF

OFF

ON

CONTROLLER
LED
REMOTE
CONTROLLER
SIGNA

L

EXTERNA

L

CONTROLLER
SWITCH

23

1

44

40

18

˚

c

˚

c

˚

c

˚

c

2

 

 

When External SW connection select "YES" from remocon installer menu: 

  Heating or Cooling system will operate normally if the External Switch signal is ON. 

  Once the External Switch turn OFF, System Turn OFF ( Heat pump, water pump, heater etc…) 

  Remocon LED remain ON or OFF according to the current operation request. 

  Pop up menu at remocon main screen as above screen to inform customer system stop by External Switch. 

  It is possible to press cancel and return to main screen to do change of operation setting while waiting the 

External Switch turn ON back. 

  Remocon LED will always follow the latest changes from remocon. 

  If no action on remocon for continuous 5 minutes, the pop up screen will show again on the screen. 

  But once the External Switch Turn ON back, pop up screen will disappear and system can operate normally 

according to the latest operation setting and request. 

126 

External compressor switch port can have two purpose of control as below: 

  Heat source ON/OFF function (Dip switch Pin 3 on PCB "OFF") 

  Heater ON/OFF function (Dip switch Pin 3 on PCB "ON") 
 

  Heat source ON/OFF function 
 
Purpose: 

  Heat pump ON/OFF function is use to turn OFF the high power consumption device (Heat pump, & Heater) when 

there is energy or electric current limitation. Other optional function still can be operate under heat pump and 
heater OFF condition. 

 
Control Detail: 

 This 

External 

Compressor 

Switch is possible to connect to Optional PCB only. 

  Once the remocon select External Compressor Switch connection "YES", & Dip Switch on PCB "OFF" 

This heat pump ON/OFF function will activate 

  The ON/OFF signal of this External Compressor Switch is same as External Switch. 

  When the External Compressor Switch is ON: 

o  Heat pump system operate normally 

  When the External Compressor Switch is OFF: 

o  Heat pump, Indoor water pump & Heater ( Booster heater & Backup Heater ) need to turn OFF 
o  Solar, Boiler and zone control can be operate follow normal control condition. 

* pump delay OFF also included in this control 

 

(There is NO pop up screen like External Switch when this External Compressor Switch is OFF.) 

 

  Heater ON/OFF function 
 
Purpose: 

  Heater ON/OFF function is use to turn OFF the heater (backup heater & booster heater) when there is energy or 

electric current limitation. Heat pump and other optional function still can operate. 

 
Control detail: 

 This 

External 

Compressor 

Switch is possible to connect to Optional PCB only. 

  Once the remocon select External Compressor Switch connection "YES", & Dip Switch on PCB "ON" 

This heater ON/OFF function will activate 

  When the External Compressor Switch is ON: 

o  Heat pump and heater operate normally 

  When the External Compressor Switch is OFF: 

o  Backup heater and booster heater cannot operate even heater request is ON. 
o  Heat pump and option function (Solar, Boiler and zone control) can be operate follow normal control 

condition. 

 

(There is NO pop up screen like External Switch when this External Compressor Switch is OFF.) 

Purpose: 

  User can switch the running mode from heat to cool or cool to heat through external installed Heat/Cool switch. 

This kind of heat / cool switch may built in inside the field supply room remocon as well. 

 
Control contents: 

  Heat/Cool Switch can only be set when Cool Function is "enable" at custom menu setting, & Extension PCB 

select "YES" & Zone 1 not set "Pool" condition. 

  This heat/cool switch control will be activate only when installer set the Heat/Cool Switch "USE" through remocon. 

  Once the Heat/Cool Switch Set "USE", remocon will check indoor send Signal to judge the option of mode select. 

o  When Heat/Cool Switch Contact Open : Remocon only can select Heat Mode, or Heat + Tank Mode, or Tank 

Mode 

o  When Heat/Cool Switch Contact Close : Remocon only can select Cool Mode, or Cool + Tank Mode, or Tank 

Mode 

 
 

127 

  Operation ON/OFF will depend on remocon request. 

  When Heat Mode is running with Contact Open, user change this setting to contact close, indoor will this signal to 

remocon judge and change mode to cool and send back to indoor. And it is same as from cool mode change to 
heat mode. 
* This switch have higher priority, remocon follow indoor send signal when control activated. 
* There is no effect to the operation when the mode running is only Tank Mode. 

 

(Weekly Timer are ignored and cannot be set during Heat / Cool Switch is "Enable" Condition.) 

Purpose: 

  To set ON/OFF of heat pump and target temperature by digital input of third party device if necessary in field. 
  

Optional PCB

D

igi

ta

l I

nput

Remote Station

+ DI2 Com

+ DI1 Com

- Com

 

 

Remote control setting 
 
For this function, following items need to be set on R/C (installer menu) – 
 

  SG control = YES or NO 

  Capacity up setting 1 

o  Heating capacity [50 ~ 150 %] 
o  DHW capacity [50 ~ 150 %] 

  Capacity up setting 2 

o  Heating capacity [50 ~ 150 %] 
o  DHW capacity [50 ~ 150 %] 

 
Control contents: 
 
If SG control on remote control = "Yes", then following control only activate by digital input. 
 

  While Digital input is " 00 " (Normal operation) 

o  Normal operation. Once detect '00' system will operate back to normal condition. 

(All the target set temperature for heating side and DHW side will return back to previous set temperature 
when digital signal change from "10' or"11" back to "00".) 

  While digital input is detected " 01 " (HP stop) 

o  Heat pump & room heater & tank heater cannot operate. 

  While digital input is detected " 10 " (Capacity 1)  

o  Target temperature for heating and DHW Tank is changed according to the percentage set by Remote 

control setting. However, which setting temperature is change depend on system setting. 

  While digital input is detected " 11 " (Capacity 2)  

o  Target temperature for heating and DHW Tank is changed according to the percentage set by Remote 

control setting. However, which setting temperature is change depend on system setting. 

  While digital input is detected " 10 " (Capacity 1) 

o  Setting temperature for heating and Tank is changed. 

However, which setting temperature is change depend on system setting. 

 
 
 
 

128 

If Buffer selection is “YES” 
Room side 
New Target Buffer tank temperature = Current Target Buffer Tank Temperature * Remote Control setting  
(" capacity 1) % 
* Max Min regulation is follow Target Buffer tank temperature control specification 
** No change of Target zone water temperature, only set higher buffer tank temperature. 

 

DHW Tank side 
New Tank Set Temperature = Tank Set Temperature * Remote Control setting for DHW ("Capacity 1) % *  
(Max regulation depend on the tank max setting limit) 

 

If Buffer selection is “NO” 
Room side 
New Target Zone Water Temperature = Current Target Zone Water Temperature * Remote Control Setting 
(*Capacity 1) % 
(Zone 1 and Zone 2 will change according to its own target zone water temperature.) 
(Max regulation depend on the temperature control type select) 

 

DHW Tank side 
New Tank Set Temperature = Tank Set Temperature * Remote Control setting for DHW ("Capacity 1) % 
* (Max regulation depends on the tank max setting limit) 

 

  While digital input is detected " 11 " (Capacity 2) 

o  Setting temperature for heating and Tank is changed. 

However, which setting temperature is change depend on system setting. 
 

If Buffer selection is “YES” 
Room side 
New Target Buffer tank temperature = Current Target Buffer Tank Temperature * Remote Control setting  
(" capacity 2) % 
* Max Min regulation is follow Target Buffer tank temperature control specification 
** No change of Target zone water temperature, only set higher buffer tank temperature. 

 

DHW Tank side 
New Tank Set Temperature = Tank Set Temperature * Remote Control setting for DHW ("Capacity 2) % 
* (Max regulation depends on the tank max setting limit) 

   

If Buffer selection is “NO” 
Room side 
New Target Zone Water Temperature = Current Target Zone Water Temperature * Remote Control Setting 
(*Capacity 2) % 
(Zone 1 and Zone 2 will change according to it's own target zone water temperature.) 
(Max regulation depend on the temperature control type select) 

 

DHW Tank side 
New Tank Set Temperature = Tank Set Temperature * Remote Control setting for DHW ("Capacity 2) % 
* (Max regulation depends on the tank max setting limit) 
** This function is not applicable for Cooling mode. 

Remote control setting: 

  When Optional PCB connection select 'YES", Demand Control function can select "YES" or "NO". 
 
Purpose: 

  After the demand control select YES, below control will activated. 

o 0-10V 

Demand 

control 

 
0-10V Demand control 

  Demand control is use to reduce the current usage of heat pump unit by third party device. 

 

Control start condition: 

  Select “YES” at Demand control at installer menu. 

  0-10V input for this electrical current control is detected.