Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 41

(10) Setting the booster heater 1 operation conditions
A temperature at which the booster heater 1 will go into operation (TWL) can be selected.
Select item code 1057 and 1058 to set the threshold temperature (TWL1 and TAL1) for booster heater operation.
Booster heater 1 operation conditions
• Individual system
The operation command signal is ON and at least one of the following two conditions is met.
The booster heater 1 signal of the main unit comes on.
• Multiple system
The operation command signal is ON and the following condition is met.
The booster heater 1 signal of the main unit comes on.
Booster heater 1 operation-stop conditions
The operation command signal is OFF or all of the following two conditions are met.
Setting procedures
Set the dip switches on the circuit board as follows to change the settings.
Step 1
Set dip switches
SW5 and SW6.
Switch settings
1 Water-temperature control option is set to OFF, the water temperature drops below
TWL1, and the outside temperature drops below TAL1.
2 Water-temperature control option is set to ON, the external water temperature sensor
reading drops below TWL1, and the outside temperature drops below TAL1.
External water temperature sensor readings (TH14 and TH15) drop below TWL1, and
the reading of the outside temperature sensor connected to the main unit drops below
TWL1.
1 The water temperature is at or above TWL1+2°C or the outside temperature is at or
above TAL1+2°C.
2 External water temperature sensor readings (TH14 and TH15) are at or above
TWL1+2°C, or the reading of the outside temperature sensor (TH9) connected to the
main unit exceeds TAL1+2°C.
SW5
10 5
OFF OFF
SW6
6 7
OFF OFF
41
8 9
OFF ON
10
OFF