Harman® • Accentra 52i Installation Manual_R16 • 2013 -___ • 09/15
27
3-90-00574i
Figure 5.24
E. Low Draft Voltage Adjustment
These units are pretested at the factory with exactly 120 VAC,
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 unit's permanent
installation conditions.
The control board on the Accentra 52i Pellet Insert is
equipped with a low draft adjustment port. Located on the
control face just to the right of the igniter light. Figure 5.23.
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 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.
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. Figure 5.24. To 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. (Cold Stove)
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 -.30 to
-.40) 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 -.25 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 -.35
even with the set screw completely counter-clockwise.
Combustion Motor
Speed Control Low
draft only set point.
T h e s m a l l s t r a i g h t
screwdriver slot is plastic;
therefore, the unit can
be adjusted while in
operation.
Draft Meter bolt hole location
The head of the Draft bolt can be accessed from inside the firebox
on the left hand side.
Figure 5.23
