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8.4.3 Apportioned calculation of indoor unit
Figure 8-10 shows an example of apportioning method when a watt-hour meter is installed on the indoor
unit power source line.
(1) Decision of indoor unit apportioning mode
First decide to carry out the apportioning of indoor unit or not.
When a watt-hour meter is not connected to the power source line of indoor unit, set to [No
apportioning].
No apportioning: The electric power consumption of indoor unit will not be apportioned.
Apportioning : The electric power consumption of indoor unit will be apportioned by “Integrated time
× Fan capacity
When “Apportioning” is selected, [Power consumption per indoor unit] is integrated for each charging
time frame per indoor unit by dividing it into [Auxiliary heater power consumption] and [Fan power
consumption].
For the models without auxiliary heater, [Fan power consumption] = [Power consumption per indoor unit]
is applied.
For the auxiliary heater and fan operation time, G-50A collects it from the indoor unit in a cycle of 1
minute.
0.085kW × 3.45 hours
1.0W × 1.23 hours
Fan
capacity
Auxiliary
heater
capacity
Fan
operation
time
Auxiliary
heater
operation
time
Charging time frame 1 Charging time frame 1
Fan power
consumption
Example) 0.29325kW
Indoor unit power
consumption
Example) 1.52325kW
Auxiliary heater
power consumption
Example) 1.23kW
(2) Apportioning calculation of indoor unit
[Power consumption per indoor unit] integrated for each indoor unit per charging time frame is summed
up for the indoor units in the watt-hour meter system to obtain [Total power consumption of indoor units].
Using a ratio of these two data, [Power consumption] per charging time frame collected from PLC or
RS-485WHM is apportioned once a day.
Charging time frame 1
Charging time frame 1
Indoor unit
power
consumption 1
Indoor unit
power
consumption 1
Indoor unit
power
consumption 2
Total power consumption of indoor units
Daily power
consumption
Daily power
consumption
of indoor unit 1
The standard charge is only added at calculation on the clearance day, and printed
out after summing up the air conditioning charge. Printing out is not available for the
calculation of specified days.
CAUTION
(3) Processing on clearance day
On the clearance day, sum up [Daily power consumption by indoor unit] for each tenant (charging block)
and add the standard charge to calculate the monthly electric charge.