Hitachi RAS-3HVRNS - Page 154

Outdoor fan control during cooling operation
Pressure switch for
control: ON
Yes
Operation
10 sec.
*1) Fan step at start
Step up
Is fan operated more
than 3 min?.
No
No
Yes
Pipe surface temp. of
outdoor unit heat exchanger
< 30 ºC.
No
Pipe surface temp. of
outdoor unit heat exchanger
> 40 ºC.
No
Same step Step up Step down
Yes
Yes
Pressure switch for
control: ON
Step up
Yes
Is it continuous for
more than 1 min.?
No
Yes
Is it continuous for
more than 3 min.?
(8~12HP > 5 min)
Yes
No
MOF2
MOF1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
ON regulated
OFF
ON speed 1 ON speed 2
Fan steps
Mof 1
Mof 2
5 Control System
146
SMGB0060 rev. 1- 12/2010