Honeywell TRADELINE Q314, User Manual

Service

WARNING

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 normal operation, but is

properly adjusted, recheck Mounting and Location instruc-
tions on page 1.

2. If all mounting and location instructions are followed

but pilot continues to go out, construct shielding to protect
pilot flame from main burner ignition and extinction and
drafts. See Fig. 9.

3. Check pilot flame characteristics.
• Check the pilot flame with the main burner operating.
• Ensure the pilot flame continuously covers the tip of

the thermocouple or thermopile, the spark gap and
3/8 to 1/2 in. [10 to 13 mm] of the ground rod. See
Fig. 8.

• Ensure the pilot flame is blue (a yellow tipped flame is

acceptable on LP systems), soft and steady. See Fig. 9
for examples of possible pilot flame problems and their
causes.

• If pilot burner is damaged, replace it with an identical

pilot burner and mount and position in the same
location and orientation.

4

Fig. 8—Thermocouple or thermopile tip must be
in pilot flame.

THERMOCOUPLE
OR THERMOPILE

PROPER
FLAME
ADJUSTMENT

3/8 TO 1/2 INCH
[10 TO 13 MILLIMETRES]

M1973A

IGNITE PILOT BURNER

1. Before lighting pilot burner, turn thermostat to its

lowest setting. Wait for unburned gas to vent.

NOTE: LP gas is heavier than air and will not vent upward.

Smell for LP gas next to floor. If you smell gas, shut off the
main valve in the gas piping, or, ON LP, AT THE TANK.
Perform Gas Leak Test to recheck all connections.

2. Light pilot burner according to appliance manu-

facturer’s instructions.

Fig. 9—Examples of unsatisfactory pilot
flames.

PILOTSTAT SAFETY CONTROL POWER UNIT
FAILURE

1. Ensure pilot flame is properly adjusted.
2. Ensure power unit connections clean and tight.
3. If power unit still fails to hold in, use the W129A

Millivoltmeter to obtain the open and closed circuit voltage
generated by the thermocouple or generator.

4. Compare measured open and closed circuit voltage

values to Acceptable Range Charts in W129A Manual.

5. If W129A Millivoltmeter or other meter is not avail-

able, replace thermocouple or thermopile. If this does not
correct the condition, replace power unit.

THERMOCOUPLE OR THERMOPILE
PERFORMANCE

Thermocouples and thermopiles require proper tempera-

ture differential between the hot-junction (tip) and cold-
junction (base) to provide satisfactory operation of gas con-
trols. Thermocouples and thermopiles perform less effec-
tively when exposed to excessive cold-junction or hot-
junction temperatures.

Excessive cold-junction temperatures can be caused by

heat radiation from adjacent surfaces or high ambient air
temperatures. Excessive cold-junction temperatures can be
eliminated by shielding the pilot flame, see Fig. 10, or
constructing a baffle to direct secondary air over the pilot
burner base.

Excessive hot-junction temperatures can be eliminated by

proper pilot flame adjustment. To adjust pilot flame, see
Adjust Pilot Flame section.

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:

• LARGE 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

M3272

APPEARANCE

CAUSE