Mitsubishi Electric CAHV-P500YB-HPB, Service Handbook

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[
VII
Control ]
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HWE15070 GB
(11) Setting the booster heater 2 operation conditions
A temperature at which the booster heater 2 will go into operation (TWL) can be selected.
Select item code 1059 and 1060 to set the threshold temperature (TWL2 and TAL2) for booster heater operation.
Booster heater 2 operation conditions
•Individual system
The operation command signal is ON and at least one of the following two conditions is met.
The booster heater 2 signal of the MAIN circuit comes on.
•Multiple system
The operation command signal is ON and the following condition is met.
The booster heater 2 signal of the MAIN circuit comes on.
Booster heater 2 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.
1 Water-temperature control option is set to OFF, the water temperature drops below
TWL2, and the outside temperature drops below TAL2.
2 Water-temperature control option is set to ON, the external water temperature sensor
reading drops below TWL2, and the outside temperature drops below TAL2.
External water temperature sensor readings (TH14 and TH15) drop below TWL2, and
the reading of the outside temperature sensor connected to the MAIN circuit of the
main unit drops below TWL2.
1 The water temperature is at or above TWL2+2°C or the outside temperature is at or
above TAL2+2°C.
2 External water temperature sensor readings (TH14 and TH15) are at or above
TWL2+2°C, or the reading of the outside temperature sensor (TH9) connected to the
MAIN circuit of the main unit exceeds TAL2+2°C.
Step 1
Outdoor temperature
input source selection
3 W S 2 W S
-10 5 6 7 8 9 10
Switch settings OFF OFF OFF OFF ON OFF OFF
Items that can be set
Item
code
Initial
value
Unit
Setting
Note
Setting change from
an optional remote
controller
Incre-
ments Lower
limit Upper
limit
Outdoor temperature
input source selection
1080 0 1 0 1 Not possible
0: Outdoor temperature sensor (TH9)
1: IT terminal
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