Furnace Installation and Owners Manual
15
LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
Draft Adjustment
After the furnace 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 furnace to the
chimney, must be adjusted so the A-MAIZE-ING
HEAT
®
furnace has 0.04 to 0.06 water column
inches of draft. Refer to “Barometric Draft
Control Information” on page 36 for adjustment
instructions.
The draft gauge installed earlier (refer to “Draft
Guage” on page 10) 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.
Furnace Operation
Typical Operation Cycle
NOTE: After the furnace has been properly lit
and the operating temperature has been
reached (refer to “Burner Lighting” on page 13),
only the thermostat needs to be set to maintain
the desired temperature. The thermostat,
furnace temperature sensors, and timers control
the augers and blowers.
A typical furnace operation cycle is as follows:
Step 1: Thermostat activates fuel feed system.
The combustion fan starts and the augers feed
fuel into the burner (HIGH FIRE).
Step 2: Heat builds up in the furnace which
activates the blower fan switch. The blower fan
starts and warm air is distributed through the
ductwork.
NOTE: The furnace blower has three (3)
speeds.
•
Low (red wire #3)
•
Medium (blue wire #2)
•
High (black wire #1)
All units are shipped from the factory set to the
medium speed. The blower speed can be
changed by accessing the 10"x10" control box
on the left side of the furnace. Change blower
speeds by removing the blue wire from the
current speed terminal and reconnect it to the
desired speed terminal.
Step 3: When the thermostat setting is satisfied,
it will shut off the fuel feed system.
Step 4: To maintain the fire, a furnace 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.
Step 5: The furnace blower will continue to run
until the warm air is removed from the furnace.
