520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
75
CONFIDENTIAL
12-12. High-Altitude Region Support Functions (FM+, FM++, FM+++ and INPUT-)
＜
Using this function
＞
The high-altitude region support functions have four operation
levels, with the appropriate level being set up by the installer until
the abnormal sound problem is solved. The desired level can be
specified at the left bank of dipswitches (No.5, No.6 and No.7) on
the computer board.
*520 models installation manual doesn’t mention this function for safety purposes.
Level
Elevation
Function
Setting Method
0
0 to 2,500 ft
(DEFAULT)
Standard setting
(Default)
Left bank of dipswitches No.5 OFF
No.6 OFF
1
2,500 to 4,000ft
FM+ function
・
the fan motor speed increased by 6%
(520 Indoor)
・
the fan motor speed increased by
3.6% (520 Outdoor)
Left bank of dipswitches No.5 ON
No.6 OFF
2
4,000 to 5,000ft
FM++ function
・
the fan motor speed increased by
12% (520 Indoor)
・
the fan motor speed increased by
7.3% (520 Outdoor)
Left bank of dipswitches No.5 OFF
No.6 ON
3
Over 5,000ft
FM+++ function*
・
the fan motor speed increased by
18% (510 Indoor)
・
the fan motor speed increased by
11.4% (520 Outdoor)
Left bank of dipswitches No.5 ON
No.6 ON
4
FM+++ function & Input- function*
・
the fan motor speed increased by
18% (FM+++ function)
・
the fan motor speed increased by
11.4% (FM+++ function)
・
Lowers the max. input by 10 %
(INPUT- function)
Left bank of dipswitches No.5 ON
No.6 ON
No.7 ON
5
Consult our Technical Services Department.
If the abnormal sound problem persists even with a “Level 4” setting, please contact our Technical Service Department.
for advice. Note that there are many high risks associated with manually changing the manifold pressures.
Left bank of dipswitches
