A.O. Smith T-M50 ASME Service Manual page 66

3. Example: Output set temperature = 120˚F in a four-unit system and priority unit is No. 1
(See the table below)
1 2
T-M50
To activate additional T-M50's
Combustion unit No.
No.1
No.1+2
No.1+2+3
No.1+2+3+4
No.1+2+3+4+5
No.1+2+3+4+5+6
No.1+2+3+4+5+6+7
No.1+2+3+4+5+6+7+8
3 4
T-M50
Flow rate
GPM L/min
ON 0.5 1.9
ON 3 12
ON 6 24
ON 10 36
ON 13 48
ON 16 60
ON 19 72
ON 22 84
66
T-M50 / T-M50 ASME Service Manual
5 6
T-M50
To reduce number of activated T-M50's
Combustion unit No.
No.1+2+3++4+5+6+7+8
No.1+2+3+4+5+6+7
No.1+2+3+4+5+6
No.1+2+3+4+5
No.1+2+3+4
No.1+2+3
No.1+2
No.1
CONFIDENTIAL
Ver. 1.05
7 8
T-M50
Flow rate
GPM L/min
OFF 19 72
OFF 16 60
OFF 13 48
OFF 10 36
OFF 6 24
OFF 3 12
OFF 2.0 7.6
OFF 0.4 1.5