HearthStone Stowe 8320 Owner's Manual & Installation Manual page 37

HearthStone Quality Home Heating Products Inc
TROUBLESHOOTING (cont.)
Symptom Possible Cause
8. Floating flames, A. Potentially dangerous
lazy ill-defined, incomplete combustion due
quiet flames that to incorrect air to fuel ratio
roll around, (lack of combustion air or
sometimes excessive fuel delivery I.e.
completely off of excessive gas pressure,
the port, overrating of appliance).
sometimes with
overly yellow tips.
Possible sooting.
Usually
accompanied by
the odor of
aldehydes.
B. Incorrect air
intake/exhaust flow system.
Causes may be:
B1. Blocked Burner.
B2. Blocked primary air.
B3 Blocked secondary air
inlets.
9. Burner A. Excessive draft.
flashback. Air-gas
mixture ignites
inside the burner
near the orifice,
usually creating a
roaring noise like a
blowtorch. The
problem is an
imbalance of gas
flow velocity and
burning speed
pattern.
B. Burner input underrated.
C. Valve leak if flashback
occurs with burner valve in
off position
D. Improper gas pipe size.
STOWE Gas-Fired Direct Vent heater
Corrective Action
A. Check the appliance input rate and reduce
if necessary. The air intake/exhaust flow
system may be too restrictive or blocked (the
rate at which the exhaust leaves [draft]
determines the rate at which the combustion
air is delivered). Poor draft results in
insufficient air delivery or a restricted
exhaust. Correct air intake/exhaust flow
system.
B1. Clear ports.
B2. Clear obstructions.
B3. Clear obstructions.
Note: If gas pressures are correct and the
flames stay the same, adjust the air shutter
for a proper burn.
A. Adjust the air shutter for a proper burn.
B. Check input rate. Check input pressure
using a manometer. Confirm correct gas
pressure at house meter or tank (call gas
company). Confirm burner orifice size.
C. Replace valve. If above corrections do not
eliminate flashback, replace burner.
D. Correct plumbing.
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