Boiler Installation and Owners Manual
14
LDJ991_E01_R03_2006.03
Models LDJ991 and LDJ991-10
Draft Adjustment
After the boiler has been lit and has cycled a few
times, the chimney draft will need to be
adjusted.
The barometric draft control, installed in the
metal flue pipe connecting the boiler to the
chimney, must be adjusted so the A-MAIZE-ING
HEAT
®
boiler has 0.04 to 0.06 water column
inches of draft. Refer to “Barometric Draft
Control Information” on page 31 for adjustment
instructions.
The draft gauge installed earlier (refer to “Draft
Guage” on page 9) will be used to set the
barometric draft control.
IMPORTANT: The chimney draft should never
exceed 0.06 water column inches. On extremely
tall chimneys or chimneys larger than 6" in
diameter, it may be necessary to install a secone
barometric draft control, or to reduce the outlet
opening of the chimney to approximately 28
square inches, or both to maintain the chimney
draft at 0.04 to 0.06 water column inches.
Boiler Operation
Typical Operation Cycle
NOTE: After the boiler has been properly lit and
the operating temperature has been reached
(refer to “Burner Lighting” on page 12), only the
thermostat needs to be set to maintain the
desired temperature. The thermostat, boiler
temperature sensors, and timers control the
augers and pumps.
A typical boiler operation cycle is as follows:
Step 1: Thermostat activates the Aquastat relay
to turn on hot water circulation pump.
Step 2: If the water temperature is too cool, the
fuel feed system is activated. The combustion
fan starts and the augers feed fuel into the
burner (HIGH FIRE).
Step 3: The water heats up in the boiler until the
Aquastat relay reaches set point — the fuel
feed system then stops.
Step 4: If the thermostat setting is satisfied, the
Aquastat relay will then stop the hot water
circulation pump.
Step 5: To maintain the fire, a boiler timer will
activate the fuel feed system for a short period
of time followed by a longer period of no fan or
auger activity (LOW FIRE).
NOTE: The LOW FIRE timer is factory set to
cycle at 2 minutes ON and 6 minutes OFF. This
is a suggested setting, but can be adjusted
depending upon user experience.
Clinker Buildup
The A-MAIZE-ING HEAT
®
boiler feeds the corn/
pellets into the bottom of the burner, thereby
creating conditions for efficient fuel
consumption. The residual ash (clinkers) are
then spilled over the top of the burner ring,
falling into the ash pan below. This process
cleans the burner chamber.
IMPORTANT: If the boiler is installed in an
application that causes the boiler to run almost
continously, or if incorrect types of corn/pellets
are burned, large clinkers can form. These
clinkers can stick to burner pot and eventually
extinquish the fire. They must loosened and
removed with the clinker tool.
NOTE: If your boiler has been installed in an
application where it runs almost continuously,
and you are experiencing problems, contact LDJ
Manufacturing, Inc. for assistance.