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These units are pre-tested at the factory with
exactly 120 Volts A.C., 60 Hz. They are checked and
adjusted for firebox tightness, gasket leakage, motor
operation and igniter operation. The Advance is then
factory set at a mid-point adjustment and in most cases
will not need any adjustments. NOTE: The factory low
draft setting may not be correct for the unit's
permanent installation conditions.
The control board on the Advance is equipped
with a low draft adjustment port. Located on the control
face just to the right of the igniter light. See Figure 14.
This voltage adjustment is provided to allow the unit to
be adjusted for the household voltage where the unit is
going to be in permanent operation. NOTE: The line
voltage varies from area to area and often home to
home.
The low draft voltage should be adjusted to
achieve the most efficient burn on low burn or
"maintenance". This voltage adjustment allows the
installer to change the low voltage set point approximately
15 volts. This adjustment should be done by the installer
during set up because a draft meter reading is required
to insure proper set up.
If the unit is not adjusted properly, it does not
cause a safety concern. If the unit is adjusted too high,
only effiency is lost. If the unit is adjusted too low, the low
draft pressure switch will not allow the feeder motor or
the igniter to operate.
Fig.1
MODIFICATIONS
High Altitude (7,000 - 10,000 ft.)A combustion
fan blade change can be made by an authorized
Harman Dealer. These changes must be done with
the use of a draft meter. These changes affect the low
and high burn rate air to fuel ratios.
A simple draft test should be performed after
completing the flue pipe installation. To record the
results for future reference:
1. Plug unit into a 120VAC, 60 HZ outlet.
2. Close the hopper lid, front view door, and the ash
pan. Neither pellets or a fire are required for this test.
3. With the mode selector in the "OFF" position, turn
the feed adjuster to "TEST".
4. Record the high draft_____in W.C. (Normal is -.50
to -.60) The control will be on the High Draft for a total
of 2 minutes.
5. After 2 minutes is up, the combustion motor will go
down to low draft and the distribution blower will go on
high. Allow approximately 15 seconds to pass for the
combustion motor to slow before checking the low
draft.
6. If the low draft is between .35 and .45, record the
reading _____ in W.C. If the reading is higher, slowly
turn the set screw counter-clockwise until the draft
lowers. If the reading is lower, very slowly turn the set
screw clockwise until the draft increases.
NOTE: The test mode alternates from high to low
draft every 60 seconds. If more time is needed
for draft adjustment, wait until the next low draft
cycle.
NOTE: In some cases, the draft may not go as low
as .35 even with the set screw completely counter-
clockwise.
Combustion
Motor Speed
Control
Low draft only
set point.
The small straight
screwdriver slot is
plastic; therefore,
the unit can be
adjusted while in
operation.
Fig.14
Draft Meter bolt hole location
Fig.15
:
Low Draft Voltage Adjustment
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