Harman XXV Owner's Manual page 20
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Also See for XXV:
- Installation & operating manual (44 pages) ,
- Owner's manual (44 pages) ,
- Owners manual care and operation (35 pages)
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Combustion
B
d
Fig.
29
Control
Low draft
only set
point.
The small
'
straight
,
screwdriver
slot is plastic;
therefore, the
unit can be
adjusted while
in operation.
g
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 XXV 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 XXV is equipped with a
low draft adjustment port. Located on the control face
just to the left of the igniter light. 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
10 volts. This adjustment should be done by the installer
during set up because a draft meter reading is reauired
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 feed motor or the
igniter to operate.
Draft Meter bolt hole location
is just behind the left front
leg, near the top of the ash
pan area.
1 .
/
Fig.
30
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 - 5 0 to
-.60) The control will be on the High Draft for a total of 2
minutes.
5. After 2 minutes, 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, verv slowlv 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 to -.45 even with the set screw completely
counter-clockwise, ideally, you should just set it as
low as possible.
20
XXV Pellet Stove
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