PILOT BURNER/IGNITER-SENSOR
MUST BE RIGIDLY POSITIONED
RELATIVE TO MAIN BURNER
M3271
G. S. • Rev. 7-93 • ©Honeywell Inc. 1993 • Form Number 60-0653—8
Q345A, Q348A, Q348B, Q362A,Q373A
and Q381A Pilot Burner/Igniter-Sensors
Application
These pilot burner/igniter-sensors provide pilot flame
ignition and sensing in intermittent pilot systems. They
consist of a target type pilot burner with a combination
spark igniter and flame sensor mounted in place of the
thermocouple.
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to
follow instructions can damage product or cause a
hazardous condition.
2. Check ratings given in instructions and on
product to make sure product is suitable for your
application.
3. Make sure installer is a trained, experienced
service technician.
4. After completing installation, use these
instructions to check out product operation.
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Follow these warnings exactly:
1. Disconnect power supply before wiring
to prevent electrical shock or equipment
damage.
2. To avoid dangerous accumulation of fuel
gas, turn off gas supply at appliance service
valve before starting installation and
perform Gas Leak Test after completion of
installation.
3. Do not bend pilot tubing at the control or
pilot after compression nut has been
tightened. Gas leakage at the connection may
result.
Follow appliance manufacturer instructions if avail-
able; otherwise, use instructions provided below.
LOCATION
1. Position pilot burner/igniter-sensor for easy
access and observation. In replacement applications,
replace pilot burner/igniter-sensor with an identical unit
and position new pilot burner/igniter-sensor in the same
location and orientation as the original one.
Fig. 1—Mount pilot burner/igniter-sensor on
main burner.
PILOT BURNER/
IGNITER-
SENSOR
JUST RIGHT
PILOT BURNER/
IGNITER-
SENSOR
TOO LOW
PILOT BURNER/
IGNITER-
SENSOR
TOO HIGH
MAIN BURNER
FLAME WILL
IMPINGE ON
IGNITION-
SENSOR
IGNITION
FLAME WILL
IMPINGE ON
MAIN BURNER
IGNITION FLAME
JUST MISSES
MAIN BURNER
M3273
Fig. 2—Location of pilot burner/igniter-sensor.
2. Mount pilot burner/igniter-sensor on main burner.
Mounting surfaces other than the main burner may shift,
bend, or warp as furnace expands and contracts while
operating. See Fig. 1.
3. Mount pilot burner/igniter-sensor so the pilot flame
remains properly positioned with respect to the main
burner flame. See Fig. 2.
4. Supply pilot flame with ample air free of
combustion products.
5. Do not impinge pilot flame on adjacent parts.
Do not impinge main burner flame on pilot burner/
igniter-sensor.
6. Do not expose pilot flame to falling scale, which
could impair main burner ignition.
7. Do not expose pilot burner/igniter-sensor to main
burner rollout while igniting or extinguishing.
8. Do not expose pilot flame to drafts that push or
pull pilot flame away from the igniter-sensor.
NOTE: The Q381A Pilot Burner/Igniter-Sensor is for
horizontal mounting only. Mounting bracket must
remain vertical.