11. Operation Control
11.1 Cooling Operation
11.1.1Outdoor fan control
∙When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below:
11.1.2Annual Cooling control
∙This control is to enable cooling operation when outdoor ambient temperature is low.
∙Control start conditions:
o Cooling operation is activated with compressor ON.
o Outdoor ambient temperature is less than 59°F (15°C).
∙Control contents:
o When the above conditions are fulfilled, based on outdoor pipe temperature, the outdoor fan motor will operate according to figure below:
∙To improve the judgment accuracy during annual cooling control, outdoor ambient temperature sampling for 2 minutes will be activated every 35 minutes under designated fan speed.
∙Control stop conditions:
o When either one of the start conditions are not complied.
11.1.3Cooling Powerful Operation 1
∙During cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by temporary stop the capability supply to low load demand indoor units.
∙Operation start condition:
o Powerful operation ON for targeted indoor unit.
∙Operation content:
o If other indoor units (where Powerful operation are OFF) achieve setting temperature continuously for
1 minute after received powerful command from indoor unit, then capability supply to other indoor units are stopped for minimum 3 minutes.
Capability supply stop period follows powerful operation period.
∙Operation stops when comply either one of the following conditions:
o When other indoor units (where Powerful operation are OFF) is demand for capacity. o When the powerful operation is OFF for all indoor units.
o When Quiet operation received from 1 indoor unit. o When protection control starts.
22
