Q345A, Q348A, Q348B, Q362A,Q373A
and Q381A Pilot Burner/Igniter-Sensors
Application
These pilot burner/igniter-sensors provide pilot flame
Fig. 1—Mount pilot burner/igniter-sensor on
main burner.
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.
PILOT BURNER/IGNITER-SENSOR
MUST BE RIGIDLY POSITIONED
M3271
Installation
RELATIVE TO MAIN BURNER
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to
follow instructions can damage product or cause a
hazardous condition.
Fig. 2—Location of pilot burner/igniter-sensor.
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.
PILOT BURNER/
IGNITER-
SENSOR
PILOT BURNER/
IGNITER-
SENSOR
PILOT BURNER/
IGNITER-
SENSOR
4. After completing installation, use these
instructions to check out product operation.
TOO HIGH
TOO LOW
JUST RIGHT
IGNITION
MAIN BURNER
FLAME WILL
IMPINGE ON
IGNITION-
IGNITION FLAME
JUST MISSES
MAIN BURNER
WARNING
FLAME WILL
IMPINGE ON
MAIN BURNER
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Follow these warnings exactly:
SENSOR
M3273
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.
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.
Follow appliance manufacturer instructions if avail-
able; otherwise, use instructions provided below.
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.
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.
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
Fig. 5—Igniter-sensor tip must be in pilot flame.
Fig. 6—Proper shielding of pilot flame.
3/8 TO 1/2 INCH
[10 TO 13 mm]
PROPER FLAME
ADJUSTMENT
IGNITER-SENSOR
Q373A
PROPER FLAME
3/8 TO 1/2 INCH
ADJUSTMENT
[10 TO 13 mm]
TYPICAL
SHIELD
M1273
IGNITER-SENSOR
J Set the thermostat to call for heat.
M3777
Q345A, Q348A-B, Q362A AND Q 381A
J Watch the pilot burner during the ignition sequence.
See if:
•
•
Ignition spark continues after the pilot is lit.
The pilot lights and the spark stops, but main
burner does not light.
ADJUST PILOT FLAME
The pilot flame should envelop 3/8 to 1/2 in.
[10 to 13 mm] of the igniter-sensor tip. See Fig. 5. To
adjust pilot flame:
1. Turn off system by setting thermostat below
temperature to call for heat.
2. Disconnect lead to MV terminal on gas control.
3. Light pilot by setting thermostat to call for heat.
4. Remove pilot adjustment cover screw from gas
control.
5. Turn inner pilot adjustment screw clockwise to
decrease or counterclockwise to increase pilot flame.
6. Always replace pilot adjustment cover screw and
tighten firmly after completing adjustment to assure
pro-per operation.
•
S8600B,H; S86H only: The pilot lights, the spark
stops and main burner lights, but the system locks
out.
J If so, assure adequate flame current as follows:
•
•
•
Turn off furnace at circuit breaker or fuse box.
Clean the flame rod with emery cloth.
Make sure electrical connections are clean and tight.
Replace damaged wire with moisture-resistant
no. 18 wire rated for continuous duty up to
221° F [105° C].
Check for cracked ceramic insulator, which can
cause short to ground, and replace pilot burner/
igniter-sensor if necessary.
At the gas control, disconnect main valve wire
from the TH or MV terminal.
Turn on power and set thermostat to call for heat.
The pilot should light but the main burner will
remain off because the main valve actuator is dis-
connected.
•
•
•
Service
WARNING
•
•
Check the pilot flame. Make sure it is blue, steady
and envelops 3/8 to 1/2 in. [10 to 13 mm] of the
flame rod. See Fig. 7 for possible flame problems
and their causes.
If necessary, adjust pilot flame by turning the pilot
adjustment screw on the gas control clockwise to
decrease or counterclockwise to increase pilot
flame. After adjustment, always replace pilot
adjustment cover screw and tighten firmly to
assure proper gas control operation.
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Perform Gas Leak Test anytime work is done to
the system.
PILOT OUTAGE
1. If pilot flame goes out during ignition, but is
pro-perly adjusted, recheck mounting and location
instructions in Location section.
•
Set thermostat below room temperature to end call
for heat.
2. Refer to ignition module instructions to check
wiring between igniter-sensor and ignition module or
between gas control and ignition module.
3. If all mounting and location instructions are fol-
lowed but pilot continues to go out, construct shielding
to protect pilot flame from main burner ignition and
extinction and drafts. See Fig. 6.
4. Check pilot and main burner lightoff.
3
60-0653—8
Fig. 7—Example of unsatisfactory pilot flames.
CAUSE
APPEARANCE
SMALL BLUE FLAME
APPEARANCE
SMALL BLUE FLAME
CHECK FOR LACK OF GAS FROM:
• CLOGGED ORIFICE FILTER
• CLOGGED PILOT FILTER
• LOW GAS SUPPLY PRESSURE
• PILOT ADJUSTMENT AT MINIMUM
LAZY YELLOW FLAME
LAZY YELLOW FLAME
CHECK FOR LACK OF AIR FROM:
• DIRTY ORIFICE
• DIRTY LINT SCREEN, IF USED
• DIRTY PRIMARY AIR OPENING,
IF THERE IS ONE
• PILOT ADJUSTMENT AT MINIMUM
WAVING BLUE FLAME
WAVING BLUE FLAME
CHECK FOR:
• EXCESSIVE DRAFT AT PILOT
LOCATION
• RECIRCULATING PRODUCTS
OF COMBUSTION
CHECK FOR:
NOISY LIFTING BLOWING FLAME NOISY LIFTING BLOWING FLAME
• HIGH GAS PRESSURE
HARD SHARP FLAME
HARD SHARP FLAME
THIS FLAME IS CHARACTERISTIC
OF MANUFACTURED GAS
CHECK FOR:
• HIGH GAS PRESSURE
• ORIFICE TOO SMALL
M3778
CHECK IGNITION CABLE
2. If leadwire is damaged or deteriorated, use
1. Assure that ignition cable is not in contact with
metal surfaces.
no. 14 to 18 gauge, moisture-resistant, thermoplastic,
insulated wire with 221° F [105° C] minimum rating as
replacement.
3. Excessive temperature at the ceramic flame rod
insulator will permit electrical leakage to ground.
a. If bracket is bent, bend it back to correct
position.
2. Assure that ignition cable is not more than
3 feet [1 m] long.
3. Assure connections to the ignition module stud
terminal and the igniter-sensor are clean and tight.
4. Check electrical continuity of ignition cable.
b. If insulator is cracked, replace pilot burner/
igniter-sensor.
CHECK GROUNDING
1. If ground is poor or erratic, safety shutdown will
occur. Therefore, if nuisance shutdowns are reported,
check the ground precautions in Wire Igniter-Sensor
section.
TEST SAFETY LOCKOUT
Refer to appliance manufacturer instructions to test
for proper safety lockout times.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, Minnesota 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9
Helping You Control Your World
QUALITY IS KEY
Printed in U.S.A.
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