Table of Contents
Advertisement
7-2
Overview
1.
Purpose of electricity charge apportionment
The electricity charge apportionment function apportions air conditioner electricity charges to tenants.
Generally, indoor units are divided among and used by each tenant, and calculation of the electricity
charge for each tenant is easy. But since outdoor units are shared by multiple tenants, calculation of
the electricity charge for each tenant is not easy.
The electricity charge apportionment function allows distribution of the electricity charges of outdoor
units, which are a large part of the air conditioner power consumption, according to the air conditioner
usage of each tenant.
2.
Features of electricity charge apportionment of BACnet
(1)
Power meter is not used and electricity apportionment calculation is performed from the electricity
charges billed from the electric power company.
(2)
Apportionment calculation is performed according to indoor unit usage.
(()
In addition to electricity charge calculation of outdoor units only, electricity charge calculation
including indoor units is also possible.
(4)
Flexible definition according to the electricity charge contract configuration, block configuration,
and usage period is possible.
(5)
Since the data for 1 year is saved, recalculation of the past is possible.
3.
Precautions for Using Electricity Charge Apportionment Function
(1)
The electricity charge apportionment function requires correct setting and use in accordance with
the descriptions in this manual and Interface Specification Manual.
If correct operation based on correct setting is not performed, a reasonable result may not be
obtained.
(2)
The electricity charge apportionment function does not calculate official electricity charges like
those established by the laws and regulations of each country.
(()
Gaining an understanding of the descriptions, etc. in this manual and using the electricity charge
apportionment function accordingly should be performed by the responsibility of the user.
(4)
The electricity charges used in electricity charge apportionment calculation should only be that of
the power consumed by the air conditioner.
(5)
For the electricity charge apportionment function to function properly, BACnet
erate continuously. If BACnet
data needed by calculation is being acquired, correct electricity charge apportionment calculation
may be not be possible.
(6)
Electricity charge apportionment is performed for units identified by scanning. When the unit con-
figuration is changed, perform scanning to re-identify the target units.
(7)
Constantly maintain the units which are the target of electricity charge apportionment calculation
in the normal operating state.
If it is turned off for a long time, etc., data acquisition and correct calculation may not be possible.
(8)
The electricity charge for units or refrigerant systems which are the target of electricity charge ap-
portionment calculation are calculated even when it is turned off. To remove them from electricity
charge apportionment calculation, turn off the power of the unit or refrigerant system which is to
be removed and re-scan to remove the unit from the calculation target.
(9)
Electricity charge apportionment calculation identifies units by address. When the address of a
unit was changed by automatic addressing function, etc., perform scanning to re-identify the cor-
rect address.
(10)
Even when an indoor unit operation time is zero, the rate (proportion) of the electricity charge ap-
portionment is not zero because of the power consumed in the outdoor unit in standby.
(11)
The apportionment calculation for the electricity charge cannot be performed for air conditioners
Copyright© 2010, 2011 Fujitsu General Limited. All rights reserved.
®
Gateway is shut down or stopped by a power failure, etc. while the
44
®
Gateway
®
Gateway must op-
Advertisement
Table of Contents
