Table of Contents
Advertisement
Turndown and low fire air requirements will dictate actual
position. A high turndown burner will have a very small
gap at low fire (1/16") while a normal turndown could have
gaps of 1/8" to 1/4". High fire position is typically 30
o
60
open, depending on the application. The combustion
settings will determine final position.
Linkage adjustments are done as with any other
equipment. The damper is configured with a slow opening
profile, so that the change in airflow from low fire is more
gradual than a typical air damper. Extreme linkage setups
that attempt to slow the damper opening off of low fire are
not required.
7. Pilot and Scanner Set Up
The pilot assembly is located on the end of a gas pipe that
is inserted through the burner drawer assembly. A bracket
mounted to the guide tube is used to hold the pilot end in
the correct position. A collar and setscrew are used to lock
the gas pipe in position on the back plate.
The pilot should be located as shown in Figure E-1. Figure
E-5 shows the component dimensions of the pilot. The
pilot can be adjusted while operating, to obtain the best
flame position.
The gas pilot regulator should be adjusted for a gas
pressure of 5 – 10 inches WC (Figure E-6).
Figure E–6 Gas Pilot Regulator Adjustment
The scanner is mounted to a tube that is inserted through
the burner drawer back plate and through a hole in the
diffuser. The scanner sight tube should extend about 1/8"
past the diffuser. This position ensures that the scanner
only sees the actual flame, and not a spark or other false
signals.
8. Gas System Adjustments
The gas pressure regulator should be set to the required
gas pressure. If this value is not known, a value of
approximately 50% over the high fire gas manifold
pressure (given on burner nameplate) can be used for the
initial setting. It will be adjusted at startup to obtain the
rated capacity during setup (Figure E-7).
JBE(X) Manual
o
to
Figure E–7
Main Gas Pressure Regulator Adjustment
The low gas pressure switch (if provided) should be set
for an initial value of 50% below the lowest expected gas
pressure (Figure E-8). The high gas pressure switch (if
provided) should be initially set at 50% above the highest
valve expected at that point. See section B for location of
switches).
Use Screwdriver
Figure E–8 Gas Pressure Switch Adjustment
to Adjust Regula-
tion
9. Oil System Adjustments
The oil pressure supply to the burner should be set
for 300 PSIG if pressure atomizing and 75 PSIG if
Removable
Cover
air atomizing. The oil pressure regulator is adjusted
by removing the cap and turning the regulator screw
clockwise (cw) to increase pressure and counterclockwise
(ccw) to decrease pressure. The low oil pressure switch
(Figure E-10) should be set for a pressure of about 25
PSIG lower than the regulated pressure.
Page 38
Removable
Cap
Use
Screwdriver
to adjust
Regulator
Adjusting
Knob
Removable
Cover
Section E - Preliminary Adjustments
Advertisement
Table of Contents
