Harman PB 105, Installation And Operating Manual

Page: 34 / 48

34
FEEdEr dOES NOT FEEd
1. No pellets in hopper.
2. Firebox draft may be too low for low draft pressure
switch in feeder circuit to operate. Check for
improperly closed doors , loose or missing gasket
on doors or hopper lid, or a faulty pressure switch.
3. Feed motor will not run until the ESP senses
170 deg. F. Maybe you did not put
enough pellets in the burn pot before lighting the
fire manually.
4. Something is restricting flow in the hopper or
causing the slide plate to stick.
5. Feed motor has failed.
pArTIAllY burNEd pEllETS
1. Feed rate too high.
2. Draft too low. (Check burn pot clean-out slide
and door gasket).
3. Burn pot or heat exchanger tubes may need to
be cleaned.
4. Combination of all the above.
5. #6 status blink: A 6 blink control board status
indication is caused by poor or incomplete
combustion. The Automatic Ignition circuit board
has the ability to track the combustion through
feed settings and ESP temperatures. When the
control board has calculated poor or incomplete
combustion, it will shut down the unit as a safety
feature. (Poor or incomplete combustion is a
contributer of creosote which may cause a chimney
fire)
A 6 blink status may be caused by several things:
1. Blocked or partially blocked flue.
2. Blocked or partially blocked inlet air.
a. Backdraft damper on the inlet pipe may be
stuck closed.
b. If outside air is installed, the inlet cover may
be blocked.
3. The air chamber under the burnpot may be filled
with fines and small bits of ash.
4. The holes in the burnpot may be getting filled with
ash or carbon buildup.
5. Combustion blower fan blades may need cleaned.
6. There is no fuel in the hopper.
SmOkE SmEll
Seal the vent pipe joints and connection to stove
with silicone.
FIrE hAS gONE OuT
1. No pellets in hopper.
2. Draft setting is too low.
3. Something is restricting fuel flow.
4. Feed motor or combustion blower has failed.
5. Power failure or blown fuse.
SmOkE IS vISIblE COmINg OuT OF vENT
1. Air-fuel ratio is too rich.
A. Feed rate too high.
B. Draft too low caused by a gasket leak.
lOW hEAT OuTpuT
1. Feed rate too low
2. Draft too low because of gasket leak.
3. Poor quality or damp pellets
4. Combination of 1 and 2.
Cleaning burn pot
Whenever your boiler is not burning, take the
opportunity to scrape the burn pot to remove carbon
buildup. A vacuum cleaner is handy to remove the
residue. be sure the boiler is cold if you use a
vacuum.
Carbon buildup can be scraped loose with the fire
burning using the special tool provided with your stove.
Scrape the floor and sides of the burn pot. The carbon
will be pushed out by the incoming fuel. Always wear
gloves to do this.
removing Ashes
Ashes can be removed while in operation, but extra
care must be taken and always wear gloves.
Maximum Feed Adjuster settings are not needed
in most cases. Operating in the normal range (#4)
is recommended when maximum heat output is not
required. The ESP prevents the stove from being over-
fired.
Keep the boiler free of dust and dirt.
Fuel
Pellet fuels are put into 3 categories in terms of ash
content. Premium at 1% or less, Standard at 3% or less
and all others at 3% or more.
This unit is capable of burning all 3 categories of
pellets due to a patented feeder and burn pot system.
It should be noted, however, that higher ash content
will require more frequent ash removal, scraping of
the burn pot, and may provide less BTU’s per pound.
Normally, standard and high ash pellets cost less than
premium pellets and can be cost effective when burned
in this boiler.
The moisture content must not exceed 8%. Higher
moisture will rob BTU’s and may not burn properly.
Troubleshooting
helpful hints