Harman Stove Company Accentra Owner's Manual page 12

Fig.17
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 ignitor
operation. The Accentra 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 is equipped with
a low draft adjustment port. Located on the control face
just to the left of the ignitor light. See Figure 17. This voltage
adjustment is provided to allow the unit to be adjusted for
the household voltage where the unit is going to be in
permaneant 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 ignitor to operate.
Low Draft Voltage Adjustment
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.
Draft Meter bolt hole location
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 -.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.
Fig. 18