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97 

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time 
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating 
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and 
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by 
the microcomputer at indoor unit that judging the condition according to internal water setting temperature and water 
outlet temperature. 

Once the operation starts, control panel setting temperature will be taken as base value for temperature shifting 
processes. These shifting processes are depending on the Air-to-Water Heat pump settings and the operation 
environment. The final shifted value will be used as internal water setting temperature and it is updated continuously 
whenever the electrical power is supplied to the unit. 

  Compressor is OFF when Water Outlet Temperature – Internal Water Setting Temperature > 2°C for 

continuously 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Water Outlet Temperature – Water Inlet Temperature 

(temperature at thermostat OFF is triggered) <-3°C. 

Stops provide heating to room side during high outdoor ambient condition. 
Control content: 

  Heating operation and water pump will turn OFF when outdoor ambient temperature > outdoor thermo off 

temperature + 3°C. 
(Outdoor thermo off set temperature is set by control panel. Thermo off set temperature is between 5°C ~ 35°C) 

  Heating operation will resume when Outdoor ambient temperature < Outdoor thermo OFF set temperature + 1°C. 

Operation of heat pump provide heating capacity to room side by hot water through heating panel, floor heating or 
fan coil unit. 

1  3 ways valve control: 

o 

3 ways valve switch and fix to heating side. 

2  Heat pump operates follow normal heating operation. 
3  Back up heater operate follow normal operation. 
4  2 ways valve control: 

o 

2 ways valve opens. 

  Compressor is OFF when Water Outlet Temperature – Internal Water Setting Temperature > -1.5°C for 

continuously 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Water Outlet Temperature – Water Inlet Temperature 

(temperature at thermostat OFF is triggered) >3°C. 

1  3 ways valve control: 

o 

3 ways valve switch and fix to cooling side. 

2  Heat pump operates follow normal cooling operation. 
3  Room heater DOES NOT operate during cool mode. 
4  2 ways valve control: 

o 

2 ways valve is closed. 

 

98 

There are 2 types of temperature control selection which are Compensation and Direct. 

  Temperature control type selection by installer: 

1  Compensation : Wlo, WHi, ODLo, ODHi can be set at installer menu. 
2  Direct             : Direct Water Temperature Set  

  Remote control setting by user: 

1  Compensation : Shift value ± 5°C from the compensation curve 
2  Direct             : Direct water temperature set change 

 
*This setting only able to set when room sensor select as Water Temperature. 
*Instead of water temperature, user will set target room temperature when room sensor select as Room Thermistor 
OR Internal Room Thermostat. 
 

  Target water temperature is calculated as below condition. 

o  Target water temperature = A (Base temperature) + B (shift temperature) 

 

Value from the curve + User shift value set 

Direct value from user setting 

 

o  B (shift temperature) value is depend on the room sensor selection at remote controller as below table: 

B (Shift Temp.) 

  B shift value depend on the room sensor selection at remocon as table below 

  Water temperature 

  B = 0 

  External Room thermostat 

  B = 0 

  Internal Room thermostat &   
  Room Thermistor 
   

  Cool Mode: 
  B = 0 ; when Zone OFF or Zone Room Thermo OFF   
  B = B = 1* (room set temp (R/C) - actual room temp) 
        Max/Min Regulation of B: (Max = 5 ; Min = -5)
  Heat Mode: 
  B = 0 ; when Zone OFF or Zone Room Thermo OFF 
  B = follow Heating Room Temperature PI control logic 

 

  Maximum/minimum regulation of Target Water Temperature. 

Max 55°C 20°C 

Min 20°C 5°C 

 
Compensation Type: (Operation under Heat Mode and Cool Mode) 

  The set temperature defines the parameters for the ambient (Outdoor temperature) dependent operation of the 

unit. The water temperature is determined automatically depending on the outdoor temperature. Default setting is 
the colder outdoor temperature will result in warmer water and vice versa. The user has the possibility to shift up 
and shift down the target water by remote control setting. 

OD

(LO)

 = Setting Of LOW Outdoor Ambient Temperature.

A

W

 (LO)

W

 (HI)

OD

(LO)

OD

 (HI)

Outdoor
Ambient

OD

(HI)

 = Setting Of HIGH Outdoor Ambient Temperature.

W

(LO)

 = Setting Of Water Temperature at LOW OD Ambient.

W

(HI)

 = Setting Of Water Temperature at HIGH OD Ambient.

 

99 

  Outdoor ambient is updated every 30 minutes when operation ON. 

  Setting water outlet temperature always follow W

(LO)

 or W

(HI)

 whenever is higher if outdoor ambient sensor or 

indoor comminication error happen. 

 
However, when powerful mode is requested by remote control during heating mode, the higher value of HLo or Whi 
will be used for A calculation. 
 
* There are 2 compensation curves (for heating and cooling). During heating mode, the heating curve is used and   
  during cooling mode, the cooling curve is use. 
 
 

Compensation curve set shift value: 

 

Tw

Tw_Hi

Tw_Lo

To_Hi

To

Shift value

+ 5

± 5

- 5

To_Lo

 

Target water temperature is calculated as below. 

 Heat 

Mode: 

o  Target water temperature setting: 
o  Max= 55°C  

Min= 20°C 

 

  When buffer tank selection is “YES:” 

Target water temperature = Target buffer tank temperature + [2°C] 

 

  When buffer tank selection is “NO” 

o  If both zone 1 and zone 2 is active 

 

Target Water Temperature = Higher zone target water temperature of Zone 1 and Zone 2. 

o  If only one zone is active 

 

Target Water Temperature = Zone target water temperature of active zone. 

 

 Cool 

mode: 

o  Target water temperature setting: 

Max = 20°C 

Min= 5°C 

 

  When buffer tank selection is “YES” 

o  If both zone 1 and zone 2 active 

 

Target Water Temperature = Lower Zone Target Water Temperature of Zone 1 and Zone 2 

o  If only one zone is active 

 

Target Water Temperature = Zone Target Water Temperature of active zone  

 

  When buffer tank selection is “NO” 

o  If both zone 1 and zone 2 active 

 

Target Water Temperature = Lower Zone Target Water Temperature of Zone 1 and Zone 2 

o  If only one zone is active 

 

Target Water Temperature = Zone Target Water Temperature of active zone 

 

*Cool Mode does not have SG ready control 
 
 
 

100 

Purpose:- To control zone mixing and zone pump according to the zone sensor temperature 

 Start 

condition 

o  Heating zone 1 is ON by remote control or Timer or Auto Mode OR 
o  Cooling zone 1 is ON by remote control or Timer or Auto Mode. 

 

 Cancel 

condition 

o  Heating zone 1 is OFF by remote control or Timer or Auto mode AND 
o  Cooling zone 1 is OFF by remote control or Timer or Auto mode. 

 

  Target Zone 1 water temperature is calculated as below condition. 

o  Target Zone 1 water temperature = A (Base temperature) + B (shift temperature) 

 

Value from the curve + User shift value set 

Direct value from user setting 

 
*  During heat mode and compensation select, if powerful mode is activated, higher value of WLo or WHi will be use   
   as curve value. 
 

o  B (shift temperature) value is depend on the room sensor selection at remote controller as below table: 

 

B (Shift Temp.) 

  B shift value depend on the room sensor selection at remocon as table below 

  Water temperature 

  B = 0 

  External Room thermostat 

  B = 0 

  Internal Room thermostat &  
  Room Thermistor 
   

  Cool Mode: 
  B = 0 ; when Zone OFF or Zone Room Therma OFF 
  B = B = 1* (room set temp (R/C) - actual room temp) 
        Max/Min Regulation of B:  (Max = 5 ; Min = -5)
  Heat Mode: 
  B = 0 ; when Zone OFF or Zone Room Thermo OFF 
  B = follow Heating Room Temperature PI control logic 

  Pool Function Selected 

  B = Delta value setting from remocon 

 
*  B = 0 regardless of which sensor selection, if SHP control bit is enable except Pool function select (maintain Pool  
   “B” value) 
 
** Pool function also can be select at Zone 1 when optional PCB is connected and Zone 1 system is select. 
 

  Maximum/minimum regulation of Target Water Temperature.  
 

Max 55°C 20°C 

Min 20°C 5°C 

 

  Target Zone 1 Water Temperature (Heat mode only) during SG ready control 

o  If buffer tank selection is “NO” then following shift is carried out. 

  While digital input is “10” or “11” then,  

Final Target Zone 1 water temperature 
= Target Zone 1 water temperature* (SG ready % setting (remote control menu))% 

o  If buffer tank selection is “YES” 

  No shift of Target Zone 1 Water Temperature. Target Buffer Tank Temperature will change accordingly. 

* Refer to “Buffer tank temperature control”