Low Draft Voltage Adjustment - Harman The Accentra Pellet Stove Installation & Operating Manual

Fig.17
These units are pre-tested at the factory with exactly
120 Volts AC, 60 Hz. They are checked and adjusted
for firebox tightness, gasket leakage, motor operation
and igniter 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 igniter 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 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
ensure 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
efficiency 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.

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. Record the
results for future reference:
1. Plug unit into a 120 VAC, 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 1 minute.
5. After 1 minute, 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: In some cases, the draft may not go as
low as .30 even with the set screw completely
counter-clockwise.
Fig. 18
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