Figure 1. Suggested piping arrangement for 6422 and 6514 Burners for gas and/or light oil.
North American Fire
•
All™Dual-Fuel™ Burners
Instructions 6422
1.Requirements:
a) Maximum allowable inlet pressure to the air/gas ratio
regulator (Bul. 7216 or 7218) is 32 osi. If greater than
32 osi, an upstream pressure regulator (not shown) must be
used.
b) Gas supply pressure to the air/gas ratio regulator should
be at least 2 osi greater than the high fi re burner air pres-
sure. If less, a bleeder (Bul. 8654/8655) must be installed in
the impulse line. See Figure 2.
c) Fuel oil must be supplied to the air/oil Ratiotrol™ (Bul. 7052)
at 25-30 psi. Oil should be supplied from a circulating sys-
tem controlled by a diaphragm relief valve.
d) Atomizing air pressure at burner must be at least 14 osi.
e) Consult your insurer or your local Fives North American
Combustion, Inc. fi eld engineer for automatic shutoff and
fl ame supervision requirements.
2.Burner Mounting:
a) Burners should be mounted with air, gas, pilot, and UV
connections on the top or side to prevent oil dripping into
them.
b) WARNING: Burners cannot be rotated with respect to
the mounting plate as the pilot and fl ame detector ports
must align with notches in the plate.
c) To minimize leaks around the tile and to prevent tile dam-
age from thermal expansion of the wall, follow the
instructions on Supplements DF-M1 and DF-M2.
3.Piping:
a) Minimize piping pressure losses. Use a minimum of elbows.
Substitute 45 elbows for 90 elbows when possible. Do not
use street elbows. Use pipe (not tubing) for pilot air and
gas lines.
3⁄8
" tubing may be used for impulse lines up to 8
long,
½
" tubing or larger for longer runs.
b) Pipe air and fuel lines in a manner similar to that shown in
Figure 1. Flexible connections (Bul. 8770) are recommended
in air and fuel lines to minimize strain from piping and ther-
mal expansion.
c) Pilot air, pilot gas, and atomizing air supply connections
must be made upstream of primary burner controls so they
are not aff ected by the zone air control and gas shutoff
valves.
d) Connect impulse piping as shown in Figure 1 (or as in
Figure 2 if a bleeder is used). These piping arrangements
are designed to keep air and gas fl ows on desired ratio at
all fi ring rates. (Ref: Bulletin 7216, Instructions 7218 and Bul.
8654/8655.)
e) Ratio regulator impulse line connections must be located
between the zone control air valve and the manual burner
air valve for multiple burner zones and downstream of the
manual burner air valve for single burners.
INSTALLATION
#2 Fuel Oil
25-30 psi
Gas
2 psi Max.
7052
8521-01
7216 or 7218
1807
8697
8598A
1126
1813
Zone A (1 Burner)
1122
8598A
Zone B (2 Burners)
Main Air
1122
Atom. Air
16 osi Min.
1122
ENERG
Y | C
OMBUSITION
