Harman PB 105, Installation And Operating Manual

Page: 21 / 48

21
Installation
Draft Test Procedure
After the venting is completed, the firebox low draft will
need to be checked and possibly adjusted. After removing
the 3/8” bolt from the draft hole shown in Fig. 9, insert the
draft meter tube. The appliance doors and hopper lid must
be latched during this test. (It is recommended that the draft
meter have a scale of 0 to 1” WC.)
Turn the feed adjuster to “Test”. this will start the
combustion blower and allow you to check and record the
High Draft ______ - IWC date _______ The maximum
draft must not exceed -.85” W.C. Some form of vent restrictor
may be needed. (There is no control board adjustment for
the High Draft)
After the first 60 seconds the “Test” mode lowers the
combustion blower voltage to the Low Burn voltage.During
this lowered voltage cycle the Low Burn Draft must be
checked and adjusted if necessary. The recommended low
draft setting should be between -.25 & -.35 IWC. Depending
on the amount of vertical rise, it may not be possible to get a
low draft reading in this range. In this case, a maximum low
draft of -.55 is acceptable.
The adjustment screw is through the small hole to the
right of the Igniter Light. See Fig. 10 . Adjusted Low Draft
is __________ -IWC.
Don’t forget to turn the feed adjuster off of “Test”.
Do not operate if the high draft exceeds -.85” W.C.
Excessive draft readings may be due to restriction in the
combustion air supply. Check for obstructions.
Draft Bolt Location
Viewing Window
Air wash Slot
Firebox Door
Fig. 9
“Test”
Low Draft
Adjustment Pot
Fig. 10
The Control
The boiler has the option to have the control panel
covered or un-covered See Fig. 11. There is a pair of
slots provided for each position. Simply move the cover
to the desired position by placing the tabs on the cover
in the proper slots.
WARNING: Do not operate with the hopper lid or
fire chamber or ash removal doors open.
WARNING: Do not store fuel or other combustible
material within installation clearance area.
CAUTION: Hot while in operation. Do not
touch. Keep children, clothing, furniture,
and other combustible material out of the
installation clearance area.
Covered
Un-Covered
Fig. 11