3
60-0653—8
Fig. 5—Igniter-sensor tip must be in pilot flame.
Fig. 6—Proper shielding of pilot flame.
M1273
TYPICAL
SHIELD
■■
Set the thermostat to call for heat.
■■
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.
•
S8600B,H;
S86H only:
The pilot lights, the spark
stops
and main burner lights, but the system locks
out.
■■
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
n
o
.
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.
•
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.
•
Set thermostat below room temperature to end call
for heat.
■■
Recheck ignition sequence as follows:
•
Reconnect main valve wire.
•
Set thermostat to call for heat.
•
Watch ignition sequence at burner.
•
If spark still does not stop after pilot lights, replace
ignition module.
•
If main burner does not light or if main burner
lights but system locks out, check module, ground
wire, and gas control as described in control
module instructions.
3/8 TO 1/2 INCH
[10 TO 13 mm]
PROPER FLAME
ADJUSTMENT
IGNITER-SENSOR
3/8 TO 1/2 INCH
[10 TO 13 mm]
PROPER FLAME
ADJUSTMENT
IGNITER-SENSOR
M3777
Q373A
Q345A, Q348A-B, Q362A AND Q 381A
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.
Service
W
ARNING
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.
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.
!
Home and Building Control
Home and Building Control
Helping You Control Your World
Honeywell Inc.
Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North
740 Ellesmere Road
Golden Valley, Minnesota 55422
Scarborough, Ontario
M1P 2V9
Printed in U.S.A.
QUALITY IS KEY
Fig. 7—Example of unsatisfactory pilot flames.
CHECK IGNITION CABLE
1.
Assure that ignition
cabl
e is not in contact with
metal surfaces.
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.
CHECK GROUNDING
1.
If ground is poor or erratic, safety shutdown will
oc-cur. Therefore, if nuisance shutdowns are reported,
check the ground precautions in Wire Igniter-Sensor
section.
2
.
If leadwire is damaged or deteriorated, use
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.
b.
If insulator is cracked, replace pilot burner/
igniter-sensor.
TEST SAFETY
LOCKOUT
Refer to appliance manufacturer instructions to test
for proper safety lockout times.
LAZY
YELLOW
FLAME
WAVING
BLUE
FLAME
NOISY
LIFTING
BLOWING
FLAME
HARD
SHARP
FLAME
SMALL
BLUE
FLAME
CHECK FOR LACK OF GAS FROM:
• CLOGGED ORIFICE FILTER
• CLOGGED PILOT FILTER
• LOW GAS SUPPLY PRESSURE
• PILOT ADJUSTMENT AT MINIMUM
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
CHECK FOR:
• EXCESSIVE DRAFT AT PILOT
LOCATION
• RECIRCULATING PRODUCTS
OF COMBUSTION
CHECK FOR:
• HIGH GAS PRESSURE
THIS FLAME IS CHARACTERISTIC
OF MANUFACTURED GAS
CHECK FOR:
• HIGH GAS PRESSURE
• ORIFICE TOO SMALL
M3778
APPEARANCE
CAUSE
NOISY
LIFTING
BLOWING
FLAME
LAZY
YELLOW
FLAME
WAVING
BLUE
FLAME
HARD
SHARP
FLAME
SMALL
BLUE
FLAME
APPEARANCE