Honeywell Burner Q345A User Manual

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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