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120 

Purpose: 

-  To sterilize water tank by setting the required boiling temperature. 

Remote control setting 

-  Days for sterilization function to start can be select. 
-  Time of selected day to start sterilization function. 
-  Boiling temperature (External heater is 55°C ~ 75°C, Internal heater is 55°C ~ 65°C) 
-  Maximum operation time is 5 minutes to 1 hour. 

Start condition 

-  Tank connection set to “YES” by remote control 
-  Sterilization function selects “YES”. 
-  Sterilization signal received from remote controller by timer. 
-  Tank mode request ON. 

Stop condition 

-  When boiling timer is completed. Boiling timer (Remote control set maximum operation time) start counting 

once tank achieve boiling set temperature OR 

-  After 8 hours of operation since sterilization start. 
-  Tank mode request OFF. 

Control content: 

-  During sterilization function activation time, target tank set temperature will internally change to boiling set 

temperature. 

-  During sterilization activates, heat pump and heater (external or internal) will operate as normal tank mode to 

achieve the boiling set temperature. 

-  Sterilization operation will end when stop condition is fulfill. 
-  After sterilization is complete, tank set temperature will resume to normal operation. 

* Tank temperature may not achieve boiling set temperature if tank heater is select OFF OR external compressor 
switch. 

 
 

121 

Purpose 

-  Stop provides heating to room side during high outdoor ambient condition. 

ON

OFF

Outdoor thermo off
set temperature +3°C

Outdoor thermo off
set temperature +1°C

 

 
Control content 

-  Heating outdoor ambient thermos OFF control only applicable when heat pump operate in heat mode. (This 

control will not activate when running in tank side) 

-  Heat pump and water pump will turn OFF when outdoor ambient is higher than outdoor thermo OFF set 

temperature. 

-  Heat pump thermos ON when outdoor ambient < outdoor thermos OFF set temperature + 1°C. 

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.