Start/Stop Levels - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

3.11 START/STOP LEVELS

The start and stop levels are the Air/Fuel Valve positions (% open) that start and stop the unit,
based on load. These levels are Factory preset as follows:
Normally, these settings should not require adjustment.
Note that the energy input of the Heating Boiler is not linearly related to the Air/Fuel Valve
position.
The Tables below show the relationship between the energy input and Air/Fuel Valve position.
BMK 750:
Table 3-8a:
Air/Fuel Valve
Position
(% Open)
0%
10%
18% (Stop Level)
20%
30%
40%
50%
60%
70%
80%
90%
100%
BMK 1000:
Table 3-8b:
Air/Fuel Valve
Position
(% Open)
0%
10%
18% (Stop Level)
20%
30%
40%
50%
60%
70%
80%
90%
100%
OMM-0119_0A
GF-130-I
CHAPTER 3 – OPERATION
Start Level:
Stop Level:
Air/Fuel Valve Position and Energy Input Relationship
Energy Input
(BTU/Hr)
0
0
50,000 (14.7 kW)
52,000 (15.2 kW)
108,000 (31.7 kW)
246,000 (72.1 kW)
369,000 (108.1 kW)
465,000 (136.3 kW)
554,000 (162.4 kW)
637,000 (186.7 kW)
733,000 (214.8 kW)
750,000 (219.8 kW)
Air/Fuel Valve Position and Energy Input Relationship
Energy Input
(BTU/Hr)
0
0
50,000 (14.7 kW)
54,000 (15.8 kW)
140,000 (41.0 kW)
297,000 (87.0 kW)
443,000 (126.9 kW)
564,000 (165.3 kW)
660,000 (193.4 kW)
789,000 (231.2 kW)
933,000 (273.4 kW)
1,000,000 (293.1 kW)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
22%
18%
Heating Boiler Energy
Input
(% of Full Capacity)
0
0
6.7%
6.9%
14%
33%
49%
62%
74%
85%
98%
100%
Heating Boiler Energy
Input
(% of Full Capacity)
0
0
5%
5.4%
14%
30%
44%
56%
66%
79%
93%
100%
Page 53 of 170
11/03/2016