Takagi T-M50 Installation Manual And Owner's Manual page 4

TWO COMBUSTION SECTIONS WITHIN THE 910 (T-M50)
Left combustion section
The water heater contains two combustion sections. The section that turns on first is whichever
section the water heater decides is the primary section. The moment at which the secondary
section fires will depend on the total flow rate and set temperature of the water heater:
Flow rate at which the secondary section fires
Example: If the set temperature is 120
＊The section(s) in operation is indicated by the black square(s).
Total Flow < 0.5 GPM
(no section turns on)
910 (T-M50)
＊The primary and secondary section will reverse roles every 100 firing cycles or every 12 hours of unit operation.
( GPM )
3.2
2.9
2.6
2.4
2.1
ºF
:
0.5 GPM ≦ Total Flow < 3.2
(primary section fires only)
910 (T-M50)
Depending on which side is the primary section
Set temperature of the 910 (T-M50)
100-120
125,130
145,150
155-185
GPM
or
910 (T-M50)
- 4 -
Right combustion section
(°F)
140
3.2 GPM < Total Flow
(both primary and
secondary sections fire)
910 (T-M50)