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122 

Purpose of the Alternative Outdoor Ambient Sensor: 

-  It is some possibility that the air to water heat pump unit will install at a location where the original ambient 

sensor is expose to direct sunlight. Therefore, another optional ambient sensor can be connect to indoor 
PCB and locate at new and better reading location to improve the heat pump performance. 

 
Control Detail: 

-  Remocon can select either the extra outdoor ambient sensor is connected or not. (YES/NO) 
-  The alternative outdoor ambient sensor will connect to indoor unit main PCB terminal. 

 

a)  when alternative sensor select NO 

-  Original Outdoor temperature sensor will use for Indoor & Outdoor heat pump operation reference sensor. 
-  Data communication direction : OUTDOOR send outdoor temperature reading to INDOOR. 
-  Error judge : OUTDOOR will judge the original outdoor sensor error (F36 display if error detect). No 

judge error on alternative outdoor sensor 

 

b)  when alternative sensor select YES 

-  Alternative Outdoor temperature sensor will use for Indoor & Outdoor heat pump operation reference 

sensor. 

-  Data communication direction : INDOOR send outdoor temperature reading to OUTDOOR. 
-  Error judge : INDOOR will judge the Extra outdoor sensor error only after operation ON request received 

from remocon. 
(F36 display if error detect). No judge error on original outdoor sensor. 

Purpose: 
When user want to use hot water now, user can press this force DWH mode under the quick menu to operate tank 
only mode to boil up the tank temperature. 
 
Remocon setting: 
Force DHW function can be activate under quick menu. 
 
Control Content: 

a)  when press the Force DHW function during operation OFF condition: 
-  When receive this Force DHW bit from remocon, indoor will run tank only mode regardless of the mode 

selection. 

-  After tank temperature achieve tank thermo off temperature, turn OFF force DHW bit and return to operation 

OFF with previous mode selection. 
 

b)  When press the Force DHW function during operation ON condition: 
-  When receive this Force DHW bit from remocon, indoor will memories the running mode and run tank only 

mode regardless of the mode selection. 

-  After tank temperature achieve tank thermo off temperature, turn OFF force DHW bit and return to previous 

memories running mode. 

 

* when operation OFF or mode change request from remocon during force DHW mode operation, End force 
DHW mode and follow the new request operation. 
 
* Once receive force DHW mode from remocon, indoor direct start tank mode and consider tank thermo ON. 
Thermo OFF only when achieve tank thermo OFF depend on the Tank System Setting. 

 

123 

  Anti freeze protection control menu can be set YES or NO by control panel. 

  In heatpump system, there are 3 types of anti freeze control: 

1.  Expansion tank anti-freeze control 



  Expansion tank anti freeze heater ON condition: 

o  Outdoor ambient temp. < 3°C 



  Expansion tank anti freeze heater OFF condition: 

o  Outdoor ambient temp. > 4°C 

 

2.  Water pump circulation anti freeze control 



  Water pump turns ON when ALL below conditions are fulfilled: 

o  Heatpump OFF (stand by) OR error occurs. 
o  Water flowing flag is ON. 
o  Water flow switch is not abnormal. 
o  Outdoor ambient temp. < 3°C OR outdoor ambient temp. sensor is abnormal. 
o  Water inlet/outlet temp. < 6°C. 
o  After 5 minutes from previous water pump OFF. 



  Water pump turn OFF when ANY of below conditions is fulfilled: 

o  Outdoor ambient temperature ≥ 4°C. 
o  During -5°C < outdoor ambient temp. < 4°C 



  After water pump ON for 4 minutes, and water inlet temp. ≥ 8°C. 



  Else, shift to back up heater anti freeze control. 

o  During outdoor ambient temp. < -5°C 



  After water pump ON for 4 minutes, and water inlet/outlet ≥ 20°C. 



  Else, shift to back up heater anti freeze control. 



  However, if flow switch is abnormal (H62), then water pump circulation anti freeze control will not activate. 

 

3.  Back up heater anti freeze control: 



  Back up heater turn ON when ALL below conditions is fulfilled: 

o  Water inlet/outlet temp. < 6°C. 
o  Water pump circulation anti freeze control activated and water pump ON for 4 minutes. 



  Back up heater turns OFF when ANY of below conditions is fulfilled: 

o  Water inlet/outlet temp. > 28°C. 
o  Water pump circulation anti freeze control deactivated/water pump OFF. 



  However, if back up heater is abnormal (H70) then back up heater anti freeze control will not activate. 

  If buffer tank selection is “NO” and Anti- Freeze function select “NO” from remote control, this control cannot 

activate. 

 
Start condition: 

a)  After [5] min from previous Zone pump off. AND 
b)  Outdoor air temp < [3] °C OR Outdoor sensor is abnormal. AND 
c)  Zone water temperature < [6]°C OR Zone Sensor Short or Open 

 
Cancel condition: 

a)  After water Zone pump ON [4] min AND 
b)  Outdoor air temp ≥ [4]°C OR 
c)  During -5 °C ≤ Outdoor air temp < [4] °C OR 

Zone water temperature sensor > [8] °C 

d)  During Outdoor air temp < [-5] °C 

Zone water temperature sensor > [20] °C 
*However, Zone water temperature sensor is Open or Short, Condition C and D is ignored. 

 

124 

Solar function: 

-  This function allow user to control the solar pump to operate depend on the solar sensor reading compare to 

the tank installed. Solar pump will circulate the hot water energy store at solar panel to heat up the DHW 
Tank or Buffer Tank. 

Solar Connection Diagram: 
 

 

 

a)  Solar function can only enable when the Optional PCB is connected. 
b)  Few part as below need to install to control the solar operation: 
- Solar 

Panel 

- Solar 

Pump 

-  Solar Panel Sensor 
-  Tank Sensor (Buffer tank sensor OR DHW Tank sensor depend on the connection direction) 

* During Solar Connection to the system, installer need to alert on the high water temperature may flow to the 
zone circuit or DHW piping circuit. Therefore pipe which withstand higher water temperature need to be 
installed. 

125 

Solar remote control setting 

1)  Solar Setting can only be set when the optional PCB connection is select "YES" 
2)  By remote controller, Setting as below list can be set for solar function operation (Installer Menu) 

-  Solar Function ("YES" or "NO) 
-  Tank Connection Direction ("DHW TANK" or "BUFFER TANK") 
-  Delta T turns ON: Difference temperature setting between solar panel sensor and Tank to turn on solar 

pump. (Range :5 ~ 15°C) 

-  Delta T turns OFF: Difference temperature setting between solar panel thermistor and Tank to turn off 

solar pump. (Range :2 ~ 10°C) 

-  Outdoor temp for Anti-Freeze : Outdoor temp to start Anti-Freeze control for solar circuit. (Range : -20 ~ 

10°C) 

-  Tank Temperature HI Limit Set (Range : 70 ~ 90°C)

 

 

-  Solar function can only be activate if the solar function selection “YES” from remote control. To achieve hot 

water from solar panel, indoor need to control the solar pump and circulate hot water from solar panel. 
 
Under normal case: 
- 

Solar pump start condition: 
a)  Solar panel temperature > Delta T turn on setting temp (R/C) + Tank temperature (depend on 

selection, DHW or Buffer) AND 

b)  Tank temperature (DHW or Buffer) < Solar HI Limit Temp (R/C) AND 
c)  Operation ON with heat mode (apply to solar connect to "Buffer Tank" case) 

* Condition c) ignore if the solar system is connect to DHW tank (control active under operation OFF 
time for Tank connection case) 

- 

Solar pump stop condition: 
a)  Solar panel temperature < Delta T turn OFF setting temp (R/C) + Tank temperature (depend on 

selection, DHW or Buffer) OR 

b)  Tank hot water temp >= Solar HI Limit Temp (R/C) + [2]°C 

Under solar Anti-freeze protection control: 

- 

Solar pump start condition: 
a)  Outdoor temp < Outdoor temp setting for Anti-Freeze (R/C) 

- 

Solar pump stop condition: 
a)  Outdoor temp > Outdoor temp setting for Anti-Freeze + [2]°C 

**However, During Cool mode this function cannot activate if Tank selection is “Buffer Tank". 
**Solar pump can operate even if Heat pump is under error stop. 
 

  Solar operation during error: 

-  During Tank sensor (DHW or Buffer depend on selection) abnormal, Solar operation will not able to function. 
-  During Solar Panel sensor detect OPEN (not include SHORT), Solar operation will not able to function too.