High-Altitude Region Support Functions (Fm+, Fm++ And Fm+++) - A.O. Smith 110 Indoor Service Manual

12-8. High-Altitude Region Support Functions (FM+, FM++ and FM+++)

Using these functions
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 bank of dipswitches (No.3 and No.4) on the
computer board. See the table in the next page.
Level Elevation
0 to 2,000 ft
0
(DEFAULT)
1
2,000 to 4,000ft
2
4,000 to 6,000ft
3
Over 6,000ft
4
If the abnormal sound problem persists even with a "Level 3" setting, please contact our Technical Service Department.
for advice. Note that there are many high risks associated with manually changing the manifold pressures.
*110 models installation manual doesn't mention this function for safety purposes.
Function
Standard setting
(Default)
FM+ function
the fan motor speed increased by 6%
(110 Indoor)
the fan motor speed increased by 4%
(110 Outdoor)
FM++ function
the fan motor speed increased by
12% (110 Indoor)
the fan motor speed increased by 8%
(110 Outdoor)
FM+++ function*
the fan motor speed increased by
18% (110 Indoor)
the fan motor speed increased by
12% (110 Outdoor)
Consult our Technical Services Department.
110 Indoor / 110 Outdoor Service Manual
Bank of dipswitches No.3 OFF
Bank of dipswitches
Bank of dipswitches No.3 ON
Bank of dipswitches No.4 OFF
Bank of dipswitches No.3 OFF
Bank of dipswitches No.4 ON
Bank of dipswitches No.3 ON
Bank of dipswitches No.4 ON
53
CONFIDENTIAL
Ver. 1.01
Dipswitches
Setting Method
No.4 OFF