Sheet 4725-4 Page 2
4725- -G AND 4725- -M GAS PILOTED BURNERS
Required Pilot Mix. Pressure
Main Air Pressure
Type of Gas
Minimum
Shutoff
Type of Control
for
Type
Main
Control Motor Speed
Valve
Valve and Opening
for
Lighting Burner
of
Air
Linkage
4725- -G or -M
Glow Pilot
Pilot
Pressure §
Adjustment
Speed
High-Low or Modulating
Below
Interrupted (Shut off manually
0.1 to
1 osi
0.2 osi
(not off) and with
(Manually
any size because
Not
Not
3"w.c.
hold at low for lighting)
aft er
Critical
Critical
Manual
interrupted
burner is
pilot is
pilot
lighted)
off
High-Low or Modulating (not off)
Very
and with
"
"
Constant
Important See Chart
"
"
"
intermittent
pilot
Below§
Either a. 7219- -SS
On-Off or Modulating
Below
b. Conventional
1 osi
Set for
Solenoid
to Off
"
(lights
"
"
30 sec.
slow
Valve‡
automatically
or
movement
c. Hydramotor‡ Fast Opening (10 - 20 sec)
on control)
slower
at low
§ Minimum Main Air Pressure required to cool burner when using Intermittent Pilot.
With Glow Pilot With Non-Glow Pilot Burner size (3"w.c. mixture pressure) (1.5"w.c. mixture pressure)
-2 -3 -4 -5 -6
0.6 osi 0.3 osi 0.3 osi 0.2 osi 0.2 osi
0.3 0.2 0.2
(cannot be operated non-glow because 3"w.c. mixture pressure is required for ignition)
‡ Automatic Gas Valve should be downstream of regulator for good lighting.
GENERAL NOTES:
1. Either constant spark or distributor can be used with gas pilot. 2. Make certain burner is at low fire for lighting. 3. WARNING: Do not adjust burner for lean low fire--if done, burner damage may result. 4. When burning propane, use full primary air and set slightly lean.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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