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126 

-  Boiler is an additional or alternative heat source to heat up the room when necessary. 
-  Purpose of this control is to turn ON and turn OFF the Boiler output signal when boiler heating capacity 

needed in the system. 

-  Boiler is possible to connect to DHW Tank and Buffer Tank depends on the installer. 
-  Boiler operation parameter need to be set on Boiler itself, indoor do not control the boiler operation direction 

and operation. 

-  There are Alternative mode, Parallel mode, & Advance Parallel mode available to select by installer to fit to 

the total system. 

 
Remote control setting value: 
1)  Outdoor Ambient Set = (Range: -15°C ~ 15°C) 

-  Only one heat source operates at one time, either heat pump or boiler depends on condition. 

Control detail: 
During Operation ON at Heat mode or Tank mode or Heat + Tank Mode 
-  Boiler signal turn ON and heat pump and water pump turn OFF when: 

a.  Outdoor ambient < Outdoor Ambient Set AND 
b.  Boiler prohibit flag = 0 

** However indoor water pump can operate when Anti-freeze control condition fulfilled. 
 

-  Boiler signal turn OFF and heat pump and water pump turn ON when: 

a.  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 
b.  Boiler prohibit flag = 1 

 

-  Parallel mode allows heat pump and boiler ON at the same time. Boiler operates as an additional heating 

capacity when low heat pump capacity at low ambient condition. 

Control detail: 
During operation ON at Heat mode or Tank mode or Heat + Tank mode 
-  Boiler signal turns ON when: 

a.  Outdoor ambient < Outdoor Ambient Set AND 
b.  Boiler prohibit flag = 0 

-  Boiler signal turns OFF when: 

a.  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 
b.  Boiler prohibit flag = 1 

 
c)  Advance Parallel Mode 

-  Advance parallel mode allow heat pump to operate and turn ON boiler only when ambient and temperature 

condition is fulfilled. 

Remote control setting value: 
1)  Outdoor Ambient Set = (Range : -15°C ~ 15°C)  
2)  Selection of boiler connection direction. (Heat only, DHW only, Heat & DHW) 
3)  Setting data under Heat Direction 

a.  Start Temperature 

| START_TEMP | 

b.  Start Delay Timer 

| START_TIMER | 

c.  Stop Temperature 

| STOP_TEMP | 

d.  Stop Delay Timer 

| STOP_TIMER | 

4)  Setting data under DHW Direction 

a.  Delay Timer 

| DELAY_TIMER | 

 

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)