CleaverBrooks FLX Operation, Service And Parts Manual page 40

Chapter 2
position. Adjust the gas regulator so the manifold pres-
sure matches the rating on the burner data plate. Verify
and record the readings and pressures. High-fire is typi-
cally 3% to 4% O with less than 50 ppm CO.
2
8. Adjust the low and high gas pressure switches by turn-
ing the adjusting screw until indicator moves to a pres-
sure slightly lower than normal operating pressure for
the low gas pressure switch, and slightly higher for the
high gas pressure switch (usually 20% below and 20%
higher than normal pressure).
9. Verify low-fire and high-fire rate by clocking the meter
as previously explained.
10. After completing all adjustments, replace the regulator
gaskets and slotted aluminum screw caps. Tighten all
linkages and marked settings. Complete the Startup
report at the end of this section.
The burner should be adjusted to provide correct fuel flow at
a constant rate, at the low-fire and high-fire position as
indicated on the burner data plate. This is achieved by
clocking the gas flow at the gas meter. The gas utility or gas
meter calibration data, should be consulted to determine the
correction factors to be applied to the meter.
Natural Gas Input Calculation Using a Meter
HHV = higher heating value of gas, Btu/ft
available, use 1000)
CF = cubic feet of gas clocked
t = gas meter clock time, seconds
Pm = meter upstream pressure (see Pref for units)
Pb = barometric pressure (see Pref for units)
Pref = 14.696 psi, or 29.92 "HG, or 406.77" W.C.
Tref = gas reference temperature, ºF (use 77 if data
unavailable)
Tg = gas temperature at meter, ºF
OIL BURNERS
The Suntec B2TD-8842 oil pump is typically incorporated
and is a two-stage, two-step oil pump. The low-fire pressure
adjustment is 100-200 PSI (solenoid de-energized). High-fire
pressure adjustment is 200-300 PSI (solenoid energized).
1. Turn the burner switch to the "On" position.
2. Adjust low-fire with the oil pressure regulating valve to
have approximately 100 to 200 PSI, and adjust the air
shutter for a clean fire. Record the combustion reading
from the flue gas analyzer, normally 3.5% to 4.5% O
and less than No. 1 Smoke (Bacharach). To adjust the oil
2-28
pressure regulating valve, remove lockscrew and adjust
pressure by turning the allen screw clockwise to
increase pressure, and counterclockwise to reduce pres-
sure.
3. Operate the boiler at low-fire until it is up to operating
pressure (steam) or temperature (hot water).
4. Adjust the high-fire fuel input to match maximum oil
pressure. At high-fire, the pressure should be 300 PSI.
Verify and record the readings and pressures. High-fire
is typically 3.5% to 4.5% O
The burner should be adjusted to provide correct fuel
flow at a constant rate, at the low-fire and high-fire posi-
tion as indicated on the burner data plate.
5. Tighten all linkages and marked settings. Complete the
Startup report at the end of this section.
COMBINATION GAS-OIL BURNERS
In general, the combination fueled system is to be started first
using oil, because as a fuel, oil has a greater combustion air
requirement than natural gas.After being completely adjusted
for oil combustion, the burner is re-started and adjusted using
natural gas as fuel. Combustion adjustment of the
combination burner for natural gas involves balancing the
input rate only against the existing flow of combustion air, as
established initially for oil
Do not readjust the air shutter when tuning the
combination burner for combustion of natural gas.
3
(if no data is
1. Turn the fuel selector switch to the "Oil" position.
2. Turn the burner switch to the "On" position.
3. Proceed with startup and adjustments using the same
procedures defined in the Oil Burners section.
4. After the system has been completely adjusted for oil
firing, place the burner switch "Off" and position the
fuel selector switch to "Gas."
5. Proceed with startup and adjustments using the same
procedures defined in the Gas Burners section. Do not
alter the air settings set for oil. Correct the O
adjusting the butterfly valve for Size 2 models, and the
regulators low and high pressures for Size 1 models.
F U L L
ADJUSTMENTS
Refer to the burner data plate located inside the control panel
door. The data plate will list the burner information: Burner
and control voltage, phase, cycle, motor amperage, maximum
and minimum fuel input settings, and manifold pressure (at
zero furnace pressure). Add the furnace pressure to get the
correct manifold pressure at maximum firing rate.
These procedures assume that the pre-startup tasks, checklist,
2
electrical interference test, and pilot turndown tests have been
performed in accordance with the instructions in this manual.
Profire V Burner
with less than No. 1 smoke.
2
M O D U L AT I O N
levels by
2
B U R N E R
750-177