External Input Settings; Running Information; Thermistor Reading - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

<External input settings>
Demand control(IN4)
The selection of "OFF", whilst a signal is being sent to IN4, forcefully stops all
the heat source operations and the selection of "Boiler" stops operations of
heat pump and electric heater and performs boiler operation.
Outdoor thermostat (IN5)
The selection of "Heater", whilst a signal is being sent to IN5, performs
electric-heater-only operation and the selection of "Boiler" performs boiler
operation.
<Running information>
This function shows current temperature and other data of main component parts
of both the indoor and outdoor units.
1. From the Service menu highlight Running information.
2. Press CONFIRM.
3. Press F3 and F4 buttons to set the Ref. address. *1
4. Use the function buttons to enter index code for the component to be viewed.
(See the Table 9-4-1 for component index codes.)
5. Press CONFIRM.
*1 For multiple outdoor units control system only.
<Thermistor reading>
This function shows the current readings of thermistors located on the water and refrigerant circuit
Thermistor Description
TH1A Zone 1 room temperature
TH1B Zone 2 room temperature
TH2 Refrigerant return temperature
THW1 Water flow temperature
THW2 Water return temperature
THW5 DHW tank water temperature
TH7 Ambient (outdoor) temperature
OCH570
Thermistor Description
THW6 Zone 1 flow water temperature
THW7 Zone 1 return water temperature
THW8 Zone 2 flow water temperature
THW9 Zone 2 return water temperature
THWB1 Boiler flow water temperature
THWB2 Boiler return water temperature
34
External input settings menu screen
Demand control screen
Outdoor thermostat setting screen