Caution For Using Charging Function - Mitsubishi Electric G-50A Technical Manual

8.7 Caution for Using Charging Function

Please observe the following points when using the charging function.
(1) Caution for each control/setting
When using the charging function (power apportioned charging), make sure to conduct clearing
process before setting or modifying the system composition, monitoring display setting, and charging
system setting.
When any item has been modified, the setting of the charging system should be modified or
identified.
About the time setting
Since the change of time affects the power apportioned calculation of air conditioning charge, do not
practice it frequently in waste. (Suppress the frequency of time adjustment to once a month or the
like.)
For the time setting, use the time setting function of TG-2000A. Never attempt to conduct to change
the setting by Web browser or "Property of clock and time" of Windows.
(2) Caution for air conditioning charge
To use this charging function (power apportioned charging), it is recommended to conclude an
agreement between the building owner and tenants stipulating that the air conditioning charge shall
be collected by the apportioned charging based on the operation records (including temporary
measure taken at trouble).
To prevent the stopping of integrated software or the destruction of data at power failure or
instantaneous power stoppage, recommend to install an uninterrupted power source system.
(Recommended Model: Mitsubishi Electric FERQUPS-A series)
It is recommended to keep the result of air conditioning charge in other way than storing in the
centralized control PC. (for example to print on paper)
The registration of charge license to G-50A unit is required for all units registered to the centralized
control PCs. Without the registration, the air conditioner charging function does not operate normally.
(All of the G-50A requires Web monitor license registration.) Please refer to section 2,3 for function
licence.
(3) Calculation of air conditioning charge
The calculation method of air conditioning has originally been developed by us where the
apportioning parameter is calculated judging from the operation state of the air conditioner.
For this reason, it differs far from the system installing a watt-hour meter on the power supply site of
each air conditioner. If plural outdoor units are apportioned with one watt-hour meter, the calculation
will be carried out regarding the plural units as a one large outdoor unit. Here the COP of each
outdoor unit will not be taken into consideration.
When trouble is occurred on the system, such measure will be taken as to forward the apportioning
calculation to the next day or not to conduct the apportioning calculation.
To modify the apportioning data, use the function "Data maintenance of charging."
In the case of the power consumption PC direct reading (RS-485WHM) system, the corresponding
power consumption can not be apportioned or counted when a WHM generates trouble. Please use
the function of [Maintenance of charging data] in such case.
Since the air conditioning charge is calculated in a unit of charging block, the indoor units not
registered to the charging block will not be reflected to the air conditioning charge.
As the resultant air conditioning charge is rounded off at a figure not shown here, please note that an
error will be induced between the air conditioning charge of watt-hour meters and that of the total
blocks.
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