8
Functional description of HEX 70/90/120 and parts,
continued
Control strategy
The control board controls fans according to the air temperature in the cabinet of the
top. Higher temperatures equal higher fan speed.
Internal
fan strategy
This illustration and the tables below show the speed of the
internal
fan according to
different temperatures.
Internal
temp.
HEX 70
HEX 90/120
IT 0
18°c
16°c
IT 1
20°c
20°c
IT 2
30°c
30°c
IT 3
50°c
50°c
Rotation
speed
HEX 70
HEX 90/120
IR 1
1100 RPM 1400 RPM
IR 2
1920 RPM 2250 RPM
External fan strate-
gy
This illustration and the tables below the speed of the
external
fan according to differ-
ent temperatures.
Internal
temp.
HEX 70
HEX 90/120
IT 0
28°c
26°c
IT 1
30°c
30°c
IT 2
35°c
35°c
IT 3
50°c
55°c
Rotation
speed
HEX 70
HEX 90/120
IR 1
1100 RPM 950 RPM
IR 2
1850 RPM 1400 RPM
Top temperature inside the cabinet
Top temperature inside the cabinet
