Design Dynamics PFS VF-18P-MHD - Manual (Page 22)

www.fmiproducts.com 116986-01H 22
TRoUBlesHooTING
Continued
OBSERVED PROBLEM
Delayed ignition burner
Burner backfiring during
combustion
Orange flame in burner during
burner combustion
Slight smoke or odor during
initial operation (first hour)
Heater produces a whistling
noise when burner is lit
White powder residue forming
within burner box or on adja-
cent walls or furniture
Moisture/condensation no-
ticed on windows
REMEDY
1. Contact local natural or
propane/LP gas company
2. Clean burner (see Cleaning
and Maintenance, page 20)
or replace burner orifice
1. Clean burner (see Cleaning
and Maintenance, page 20)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner for dirt and
debris. If found, clean
burner (see Cleaning and
Maintenance, page 20)
2. Replace gas control
1. Problem will stop after a few
hours of operation
1. Turn control knob to LO
position and let warm up
for a minute
2. Operate burner until air is
removed from line. Have
gas line checked by local
natural or propane/LP gas
company
3. Observe minimum installation
clearances (see page 9)
4. Clean burner (see Cleaning
and Maintenance, page 20)
or replace burner orifice
1. Turn heater off when us-
ing furniture polish, wax,
carpet cleaners or similar
products
1. Refer to Air for Combustion
and Ventilation require-
ments (page 5)
POSSIBLE CAUSE
1. Manifold pressure is too
low
2. Burner orifice(s) clogged
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
1. Residues from manufac-
turing processes and logs
curing
1. Turning control knob to HI
position when burner is
cold
2. Air in gas line
3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice(s)
1. When heated, vapors from
furniture polish, wax, car-
pet cleaners, etc. may turn
into white powder residue
1. Not enough combustion/
ventilation air