Honeywell Q348A - Manual (Page 4)

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 cable 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
occur. 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