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127 

Control detail: 
During operation ON at Heat Mode 

-  Boiler signal turns ON when 

a.  Outdoor ambient < Outdoor Ambient Set  AND 
b.  Buffer tank temperature < Target Buffer Tank Temperature + [START_TEMP] for [START_TIMER] 

AND 

c.  Heat pump operate at room side  AND 
d.  Connection of Boiler to Heating Select "YES" From installer menu AND 
e.  Buffer Tank connection select "YES" AND 
f.  Boiler prohibit flag = 0 

-  Boiler signal turns OFF when 

a.  Outdoor ambient > Outdoor Ambient Set + [-2°C] OR 
b.  Buffer Tank temperature > Target Buffer Tank temperature + [STOP_TEMP] for [STOP_TIMER] OR 
c.  Heat pump not at room side. OR 
d.  Boiler prohibit flag = 1 

During operation ON at Tank Mode 

-  Boiler signal turns ON when 

a.  Outdoor ambient < Outdoor Ambient Set AND 
b.  Heat pump operate at tank side for continuous | DELAY_TIMER | AND 
c.  Connection of Boiler to DWH Tank select "YES" from installer menu. AND 
d.  Boiler prohibit flag = 0 

-  Boiler signal turns OFF when 

a.  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 
b.  Heat pump not operates at tank side. OR 
c.  Boiler prohibit flag = 1 

Boiler prohibit flag control 
Purpose:  

-  For product safety. Boiler signal is OFF when water temperature is too high. 

Start condition: 

a. Water 

outlet 

≥ 85°C continues for 5 minutes. 

b. Water 

inlet 

≥ 85°C continues for 5 minutes. 

c. Zone1 

water 

temp 

≥ 75°C continues for 5 minutes. 

d. Zone2 

water 

temp 

≥ 75°C continues for 5 minutes. 

 

Contents: 

  After start condition fulfilled, set boiler prohibit flag = 1 

Cancel condition: 

-  After 30 minutes from start condition fulfilled. 

 

Contents: 

  Set boiler prohibit flag = 0 

128 

Purpose: 

1  Better room temperature control to fulfill different temperature request by external room thermostat. 

Recommended external room thermostat: 

 

Maker Characteristic 

Siemen (REV200) 

Touch panel 

Siemen (RAA20) 

Analog 

 

Connection of external room thermostat: 
Wire Connection and thermo characteristic of Siemen REV200: 

 

Setting 

L/L1 (H) 

Heat Thermo 

L/L2 (C) 

Cool Thermo 

Set Temp < Actual Temp 

Open Circuit OFF Short 

Circuit ON 

Set Temp > Actual Temp 

Short Circuit 

ON 

Open Circuit 

OFF 

 

Cooling

Heating

Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.

9

L (label)

10

11

12

L1 (label)

L2 (label)

9 : Terminal Bord No.

 

 
 

Wire Connection and thermo characteristic of Siemen RAA20: 

 

Setting 

L/Y1 

(H) Heat 

Thermo L/Y2 

(C) Cool 

Thermo 

Set Temp < Actual Temp 

Open Circuit OFF Short 

Circuit ON 

Set Temp > Actual Temp 

Short Circuit 

ON 

Open Circuit 

OFF 

 

Cooling

Heating

Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.

9

L (label)

10

11

12

Y1 (label)

Y2 (label)

9 : Terminal Bord No.

 

 

Control Content: 

  External room thermostat control activate only when remote thermostat connection select YES by Indoor 

control panel. 

  When indoor running heat mode, refer thermo On/Off from heating line feedback. And when indoor running 

cool mode, refer thermo On/Off from cooling line feedback. 

  Heat pump Off immediately when receive thermo off feedback. 

129 

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: 

o 

During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side. 

2  3 ways valve switch On: 

o 

During 3 ways valve switch On time, the hot water will provide heat capacity to tank side. 

3 Stop 

condition: 

o 

During stop mode, 3 ways valve will be in switch off position. 

 

L

N2

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

 

 

* During pump down and force mode, fix 3 ways valve in close condition. 

 

* Recommended Parts : SFA 21/18 (Siemens) 

 

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. 

 

L

N2

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

 

 

* During pump down mode, fix 2 ways valve in close condition. 
* During force mode, open 2 ways valve. 

 

* Recommended Parts : SFA 21/18 (Siemens) 
 

130 

  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 dsappear and system can operate normally 

according to the latest operation setting and request.