Honeywell Q345A Installation Manual
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
MUST BE RIGIDLY POSITIONED
RELATIVE TO MAIN BURNER
Fig. 2—Location of pilot burner/igniter-sensor.
PILOT BURNER/
IGNITER-
SENSOR
JUST RIGHT
IGNITION FLAME
JUST MISSES
MAIN BURNER
PILOT BURNER/
IGNITER-
SENSOR
TOO LOW
IGNITION
FLAME WILL
IMPINGE ON
MAIN BURNER
M3271
PILOT BURNER/
IGNITER-
SENSOR
TOO HIGH
MAIN BURNER
FLAME WILL
IMPINGE ON
IGNITION-
SENSOR
M3273
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.
G. S. • Rev. 7-93 • ©Honeywell Inc. 1993 • Form Number 60-0653—8
CONNECT PILOT GAS TUBING
1. Cut tubing to desired length and bend as necessary
for routing to pilot burner/igniter-sensor. Do not make
sharp bends or deform tubing. Do not bend tubing at
control after compression nut has been tightened
because this can result in gas leakage at connection.
2. Square off and remove burrs from end of tubing.
3. Push tubing into compression nut clearance hole
until tubing bottoms.
NOTE: When replacing a control, cut off old
compression fitting and replace with new
compression fitting provided with new pilot
burner. Never use old compression fitting because it
may not provide a gas-tight seal. See Fig. 3.
2. Connect one end of the ignition cable to stud
terminal on igniter-sensor using 1/4 in. [6 mm] diameter snap-spring or cage-clips on cable ends.
3. Connect the other end of the ignition cable to the
igniter terminal on ignition module.
4. Use ceramic or plastic standoff insulators as necessary to prevent cable from contacting metal surfaces.
INSTALL BLEED GAS TUBE (optional)
1. Route bleed tube from bleed tap on gas control to
the pilot burner/igniter-sensor.
2. Push clip into place. See Fig. 4.
3. Insert bleed gas tube until 3/8 in. [10 mm] to
tubing is above pilot burner/igniter-sensor bracket. Tip
of bleed gas tube must not extend into pilot flame.
Fig. 3—Always use new compression fitting.
PILOT BURNER BODY
ON BRACKET OF PILOT
BURNER/IGNITER-SENSOR
COMPRESSION FITTING
BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT
TO GAS CONTROL
M3296
4. While holding tubing all the way in, engage threads
and turn until finger tight.
5. Using a wrench, turn compression nut one turn
beyond finger tight. Do not overtighten.
6. Connect other end of tubing to gas control
according to gas control manufacturer instructions.
WIRE IGNITER-SENSOR
The igniter-sensor must be mounted on the burner.
Connect the control module ground wire to one of the
igniter-sensor mounting screws to complete the system
grounding.
Connect ground wire as follows:
1. Use 221° F [105° C] minimum thermoplastic-
insulated wire for the ground leadwire (asbestos
insulation is not acceptable).
2. A male 1/4 in. [6 mm] quick-connect terminal is
provided on Honeywell ignition modules. Fasten female
quick-connect to wire end at ignition module.
3. Strip other end and fasten under igniter-sensor
mounting screw.
4. If necessary, use shield to protect lead from radiant heat of burner.
5. The pilot burner serves as the grounding area for
the flame signal. Run lead from pilot burner to the
common ground selected.
Connect the ignition cable as follows:
1. The high tension ignition cable must conform to
applicable local or national standards.
Fig. 4—Install bleed gas tube.
THIS DIMENSION SHOULD
BE MAXIMUM OF 3/8 INCH
[9.5 mm] WHEN BLEED
TUBE IS IN FINAL
POSITION.
BLEED TUBE CLIP
1/8 IN. STEEL TUBING
M1261
Startup and Checkout
PERFORM GAS LEAK TEST
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Check for gas leaks with soap and water solution any time work is done on a gas system.
Gas Leak Test:
1. Ensure that gas supply is turned on at the appliance
service valve.
2. Paint pipe connections upstream of pilot burner
with rich soap and water solution. Bubbles indicate gas
leak.
3. If leak is detected, tighten pipe connections.
4. Set thermostat to call for heat to light main burner.
5. With main burner in operation, paint pipe joints
(including adapters) and gas control inlet and outlet with
rich soap and water solution.
6. If another leak is detected, tighten adapter screws,
joints, and pipe connections.
7. Replace part if leak cannot be stopped.
2
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