OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 38 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 4: START SEQUENCE
4.3 Start/Stop Levels
– Air/Fuel & Energy Input
The tables below show the relationship between the energy input and Air/Fuel Valve position for
Natural Gas.
CEN 2000 Air/Fuel Valve Position
NATURAL GAS
Valve Position
on Controller
Air/Fuel Valve
Position (% Open)
Energy Input
(Btu/Hr)
Water Heater Energy
Input (% Of Full Capacity)
18% (Stop
Level)
18% (Stop Level)
100,000 (29.3 kW)
5%
30%
30%
310,000 (90.9 kW)
16%
40%
40%
540,000 (158.3 kW)
27%
50%
50%
770 ,000 (225.7 kW)
39%
60%
60%
1,030,000 (301.9 kW)
52%
70%
70%
1,290,000 (378.1 kW)
65%
80%
80%
1,560,000 (457.2 kW)
78%
90%
90%
1,840,000 (539.3 kW)
92%
100%
100%
2,000,000 (586.0 kW)
100%
CEN 1600 Air/Fuel Valve Position
NATURAL GAS
Valve Position
on Controller
Air/Fuel Valve
Position (% Open)*
Energy Input
(BTU/Hr)
Water Heater Energy
Input (% of Full Capacity)
18%
18% (Stop Level)
100,000 (29.3 kW)
6.3%
30%
30%
310,000 (90.9 kW)
19%
40%
40%
540,000 (158.3 kW)
34%
50%
50%
770,000 (225.7 kW)
48%
60%
60%
1,030,000 (301.9 kW)
64%
70%
66%
1,170,000 (342.9 kW)
73%
80%
71%
1,320,000 (386.9 kW)
83%
90%
77%
1,480,000 (433.7 kW)
93%
100%
82%
1,600,000 (468.9 kW)
100%
* Maximum Air/Fuel valve open position is 82% of the CEN 2000.
