Harman Stove Company The Harman Accentra Pellet Insert - Manual (Page 18)

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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 stove is then
factory set at a high adjustment. NOTE: Low draft
adjustment may be required. The factory low draft
setting may not be correct for the units permanent
installation conditions.
The control board on the Accentra Insert is
equipped with a low draft adjustment port. Located
on the control face just to the right of the igniter light.
See Figure 44. This voltage adjustment is provided to
allow the unit to be adjusted for the household voltage
where the unit is going to be in permanant 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
installe r to c ha nge the lo w vo ltage se t po int
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.
After the installation is completed but before the first fire is lit,
check and record the high and low draft readings.
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 and front view door. 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 -
.45 to -.55) 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 .30 and .35, 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 .30 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.44
Low Draft Voltage Adjustment
Draft Meter bolt hole location
The head of the plug bolt can be accessed through
the bottom distribution air inlet with the cast ash lip
removed.
Fig. 45
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