AERCO KC1000 Boiler equipped with C-More 2002 - Manual (Page 39)

CONTROL PANEL OPERATING PROCEDURES
3-9
STEPPER
MOTOR
DETAIL "A"
DIAL
(DETAIL “A”)
BLOWER BURNER
25
Figure 3-6.
Air/Fuel Valve In Ignition Position
8. With the unit firing properly, it will be
controlled by the temperature controller
circuitry. The FIRE RATE will be continu-
ously displayed on the front panel bargraph.
9. Once the demand for heat has been
satisfied, the Control Box will turn off the gas
valve. The blower relay will be deactivated
and the Air/Fuel Valve will be closed.
Standby will be displayed.
3.9. START/STOP LEVELS
The start and stop levels are the fire rate
percentages that start and stop the unit, based
on load. These levels are Factory preset as
follows for natural gas and propane units:
• Start Level:
20% (All units)
• Stop Level:
13% (Natural Gas)
• Stop Level:
16% (Propane)
Normally, these settings should not require
adjustment.
Note that the energy input of the boiler is not
linearly related to the fire rate percentage
(Air/Fuel Valve position). Refer to Table 3-6
below for the relationship between the energy
input and fire rate percentage of a unit running
on natural gas.
Table 3-6.
Relationship Between Air/Fuel Valve Position and Energy Input of a Unit Running on Natural Gas
Fire Rate,
Air/Fuel Valve
Position
(% Open)
Energy Input
(BTU/Hr)
Boiler Energy Input
(% of Full Capacity)
0 0 0
10 0 0
13
(Stop Level)
50,000 5 %
20 89,000 9%
30 191,000 19%
40 311.000 31%
50 460,000 46%
60 600,000 60%
70 699,000 70%
80 836,000 84%
90 955,000 96%
100 1,000,000 100%