Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 22

<Energy monitor settings>
1. General description
End user can monitor accumulated*1 'Consumed electrical energy' and 'Delivered energy' in each operation mode*2 on the main controller.
*1 Monthly and Year to date
*2 - DHW operation
- Space heating
Refer to "9-3. Main Settings Menu" for how to check the energy, and "6-2. DIP switch Functions" for the details on DIP-SW setting.
Either one of the following two method is used for monitoring.
Note: The method 1 should be used as a guide. If greater accuracy is required, then method 2 should be used.
(1) Calculation internally
Electricity consumption is calculated internally based on the energy consumption of outdoor unit, electric booster heater, pump1 and other auxiliaries.
Produced heat is calculated internally by multiplying delta T (Flow and Return temp.) and flow rate measured by the factory fitted sensors.
Set the electric booster heater capacity and water pump(s) input according to indoor unit model. (Refer to the menu tree in "9-3. Main Settings Menu")
Default
EHPT20Q-VM2EA
*1 "***" displayed in the energy monitor setting mode means the factory fitted pump is connected as pump 1 so that the input is automatically calculated.
When anti-freeze solution (propylene glycol) is used for primary water circuit, set the produced energy adjustment if necessary.
For further detail of above, refer to "9-3. Main Settings Menu".
Note: Consumed electric energy of pump A is automatically calculated by the system.
(2) Actual measurement by external meter (locally supplied)
FTC has external input terminals for 2 'Electric energy meters' and a 'Heat meter'.
If two 'Electric energy meters' are connected, the 2 recorded values will be combined at the FTC and shown on the main controller.
(e.g. Meter 1 for main power line, Meter 2 for booster heater power line)
Refer to the [Signal inputs] section in "6. WIRING DIAGRAM" for more information on connectable electric energy meter and heat meter.
Connectable electric energy meter and heat meter
Voltage free contact for 12VDC detection by FTC (TBI.1 5, 7 and 9 pin have a positive voltage.)
Pulse meter type
Minimum ON time: 40ms
Pulse duration
Minimum OFF time: 100ms
0.1 pulse/kwh
Possible unit of pulse
100 pulse/kwh
Those values can be set by the main remote controller. (Refer to the menu tree in "9-3. Main Settings Menu".)
GCH15010
Booster heater Pump1*1
2kW ***(factory fitted pump)
2kW ***
1 pulse/kwh
1000 pulse/kwh
10 pulse/kwh
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