Fujitsu AIRSTAGE J-IIIL Design & Technical Manual page 735

¢ Operation example
Breakdown of electricity charges in general and the corresponding operation of the system for each
item is as follows.
Operation status is checked
by power consumption graph
display.
Electric charge (power consumption) = Basic charge + Usage charge + Demand charge
Reduced by indoor unit
rotation control
Control target value:
Indoor unit stoppage rate (%)
Charge billed according to contract with the electric power company. Includes meter
Basic charge
reading cost and billing cost.
Usage charge Charge billed according the power consumed.
Demand charge Charge billed according to the scale of the contract with the electric power company.
¢ Notes on energy saving function
Energy saving function precautions and scope of guarantee:
The effect of the energy saving function depends on the units used in the system, usage environ-
ment, installation environment, and so forth. Each energy saving function is not guaranteed to dis-
play a fixed effect and function for operation by specific setting. Before using the function, read and
understand the following precautions.
• How to use the energy saving function:
Since the effect of the energy saving function depends on the units used in the system, usage en-
vironment, installation environment, and so forth, a different effect may appear according to the
building and operating period even when operated with the same settings and schedule. Try to
gain an understanding of the features of each energy saving function and confirm the actual effect
through operation and apply appropriate settings, etc. as required.
• Target electric power of peak cut function:
These are values used as target values when performing peak cut control. These values do not
always guarantee that the consumed power is within the target value. For example, even if forced
thermostat off and outdoor unit stoppage are activated, the control become ineffective if the out-
door unit is performing a protective operation (oil recovery and defrosting). As a result, the electric
power consumed may exceed the target electric power.
• Relationship between unit protection and energy saving function:
For VRF, there are operations and restrictions for protecting units. The energy saving function op-
erates within the range of these protective operations and restrictions. When the energy saving
function performs control against these protective operations and restrictions, the protective opera-
tions and restrictions have priority and the energy saving function is either restricted or may not
operate. As protective operations of units, there are oil recovery, defrosting, etc. which are auto-
matically performed periodically or under specified conditions.
2-25. Energy saving setting on System controller
Reduced by outdoor unit
capacity save control
Control target value:
Outdoor unit capacity upper
limit rate (%)
- (07-135) -
Reduced by peak cut control
Control target value:
Target average power (kW)
2. Function settings