System Set-Up
72
Air-to-Water Heat Pump
Temperature control parameter setting and etc
• Function Code 21
: Setting electric heater On / Off temperature
Using Step 1 capacity of electric heater : when DIP switch No. 6 and 7 is set as ʻOFF-ONʼ :
- Value #1 : outdoor air temperature where Step 1 capacity of electric heater starts operation.
- Value #2 : not used.
- Example : If Value #1 is set as ʻ-1ʼ and DIP switch No 6. and 7 is set as ʻOFF-ONʼ, then Step 1
capacity of electric heater will start operation when outdoor air temperature is below -1 °C and
current leaving water temperature or room air temperature is much belower than target leaving
water temperature or target room air temperature.
Using Step 2 capacity of electric heater : when DIP switch No. 6 and 7 is set as ʻOFF-OFFʼ :
- Value #1 : base outdoor air temperature.
- Value #2 : not used
- Example : If Value #1 is set as '-1' and DIP switch No 6. and 7 is set as 'OFF-OFF', then step2
capacity of electric heater will start operation when outdoor air temperature is below -1 °C and
current leaving water temperature or room air temperature is much belower than target leaving
water temperature or target room air temperature.
• Function Code 22
: Setting cut-off temperature in cooling mode (FCU setting included)
Determine leaving water temperature when the unit is turned off. This function is used fr preventing
condensation on the floor in cooling mode.
- Value #1 : cut-off temperature. Value #1 is valid when Value #2 is ʼ01 (that means, FCU is
installed)ʼ.
- Value #2 : determines if FCU is installed or not. ʼ01ʼ means ʻFCU is NOT installedʼ, and ʼ00ʼ
means ʻFCU is installed.ʼ
- Example : If Value #1 is set as ʻ10ʼ and Value #2 is ʼ01ʼ and actually FCU is NOT installed in the
water loop, the unit stop operation in cooling mode when the leaving water temperature is below
10 °C.
- Example : If Value #1 is set as ʻ10ʼ and Value #2 is ʼ00ʼ and actually FCU is installed in the water
loop, the Value #1 is not used and the unit do NOT stop operation in cooling mode when the
leaving water temperature is below 10 °C.
FCU Installation
• If FCU is used, related 2way valve should be installed and connected to the Main PCB assembly 1.
• If Value #2 is set as ʼ00ʼ but FCU or 2way valve is NOT installed, the unit can do abnormal
operation.
