Fujitsu AB* A12GATH, Design & Technical Manual

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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, usage environment,
installation environment, and so forth. Each energy saving function is not guaranteed to display
a fixed effect and function for operation by specific setting. Reading and understanding the
following precautions is requested before using the function.
(1) How to use the energy saving function
Since the effect of the energy saving function depends on the units used, usage
environment, 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.
(2) 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 outdoor unit is performing a protective operation (oil recovery and
defrosting). As a result, the electric power consumed may exceed the target electric power.
(3) Relationship between unit protection and energy saving function
For VRF, there are operations and restrictions for protecting units. The energy saving
function operates within the range of these protective operations and restrictions. When
the energy saving function performs control against these protective operations and
restrictions, the protective operations 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 automatically performed periodically or under
specified conditions.
(4) Failure, etc.
An energy saving function operates only when the related units are operating normally.
When the power of the electricity meter and the outdoor units connected to an electricity
meter and the SYSTEM CONTROLLER is turned off due to a failure, etc. the energy saving
function will not operate normally.
(5) Explaining to the building tenants
During energy saving function operation, control from the remote controller may be
overrided by the energy saving control. For this reason, it is recommended that the building
tenants be informed of this beforehand.
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