A.O. Smith T-D2-OS User Manual

T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
61
CONFIDENTIAL
12-10. 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 left bank of dipswitches (No.4 and No.5) on the
computer board. See the table in the next page.
*T-D2-IN/OS installation manual doesn’t mention this function for safety purposes.
Level
Elevation Function Setting Method
0
0 to 2,000 ft
(DEFAULT)
Standard setting
(Default)
Left bank of dipswitches No.4 OFF
No.5 OFF
1
2,000 to 4,000ft
FM+ function
・the fan motor speed increased by 6%
(T-D2-IN)
・the fan motor speed increased by 4%
(T-D2-OS)
Left bank of dipswitches No.4 ON
               No.5 OFF
2
4,000 to 6,000ft
FM++ function
・the fan motor speed increased by
12% (T-D2-IN)
・the fan motor speed increased by 8%
(T
-
D2
-
OS)
Left bank of dipswitches No.4 OFF
              No.5 ON
3
Over 6,000ft
FM+++ function*
・the fan motor speed increased by
18% (T-D2-IN)
・the fan motor speed increased by
12
%
(T
-
D2
-
OS)
Left bank of dipswitches No.4 ON
    No.5 ON
4
Consult our Technical Services Department.
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.
Left bank of dipswitches

A.O. Smith T-D2-OS Specifications

General

Brand	A.O. Smith
Model	T-D2-OS
Category	Water Heater
Language	English