Mitsubishi Electric CRHV-P600YA-HPB Service Handbook page 92

[ VII Control ]
(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 circuit comes on.
• Multiple system
The operation command signal is ON and the following condition is met.
The booster heater 1 signal of the MAIN circuit comes on.
Booster heater 1 operation-stop conditions
The operation command signal is OFF or all of the following two conditions are met.
(*)Unit's inlet water temperature: Average value between the water temperature settings of the MAIN and SUB
circuits
Setting procedures
Set the dip switches on the circuit board as follows to change the settings.
Step 1
Set dip switches
SW2 and SW3.
Switch settings
HWE1312A
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 (TH15 and TH16) drop below TWL1, and
the reading of the outside temperature sensor connected to the MAIN circuit of 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 (TH15 and TH16) are at or above
TWL1+2°C.
S W 2
-10 5
OFF OFF
S W 3
6 7
OFF OFF OFF
- 85 -
8 9 10
ON OFF
GB