Operation Time For Unit Rotation - A.O. Smith T-M50 ASME Service Manual

12-13. Operation time for unit rotation

The T-M50 contains two combustion sections. The section that turns on first is whichever section the
T-M50 decides is the primary section.
The priority unit and section will rotate when it reaches 100 ON/OFF cycles or after 12 hours of
operation.
NOTE: The priority unit and section is the unit that turns on first when there is a hot water demand.
When there is a black out and/or cut off for over 50 minutes, priority unit and section will switch
back to # 1 unit. (Default)
NOTE: The priority of the combustion section can be changed by pressing the "priority switch" on the computer
board of the central computer board.
NOTE: The priority of the unit and the combustion section can be changed by pressing the "priority set button" on
the computer board of the multi-unit controller (TM-MC01).
Example: Four units of T-M50 Rotation
A rotation occurs when:
ON/OFF cycles (×100 times) or Hours of operation (12 hours)
Easy link Priority
Left
combustion
Section
Priority section
Easy link Priority
Left
combustion
Section
Priority section
Easy link Priority
Left
combustion
Section
Priority section
Unit
No.1
1
Right Left
combustion combustion
Section Section
1 2
4
Right Left
combustion combustion
Section Section
2 1
3
Right Left
combustion combustion
Section Section
1 2
T-M50 / T-M50 ASME Service Manual
Unit
No.2
2
Right Left
combustion combustion
Section Section
1 2
Next step
1
Right Left
combustion combustion
Section Section
2
1
Next step
4
Right Left
combustion combustion
Section Section
1 2
67
CONFIDENTIAL
Unit
No.3
3
Right Left
combustion combustion
Section Section
1 2
2
Right Left
combustion combustion
Section Section
2 1
1
Right Left
combustion combustion
Section Section
1 2
Ver. 1.05
Unit
No.4
4
Right
combustion
Section
1 2
3
Right
combustion
Section
2 1
2
Right
combustion
Section
1 2