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11. Operation
Control
11.1 Cooling Operation
11.1.1 Outdoor fan control
When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted
according to figure below:
RPM free
RPM controlled
59°F
55.4°F
Stopped
8.6°F
OD temp.
11.1.2 Annual 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
Control
contents:
o
When the above conditions are fulfilled, based on outdoor pipe temperature, the outdoor fan motor will
operate according to figure below:
RPM up
RPM unchanged
93.2°F
91.4°F
RPM down
Stopped
75.2°F
73.4°F
66.2°F
64.4°F
OD Pipe temp.
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.