6
3-90-70744R11_05/13
Bolt the automatic
draft control to the
bottom door Be sure
to hold the unit straight
while tightening After
the automatic draft
control is mounted
the two wires must
be strung through the
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The knockout plug of
the unction box must
be remo ed to install
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Check the door of the
automatic draft control
to assure proper
operation
Warning:
Keep pieces of wood or coal out of
the draft door opening mechanism as this could cause the
door to stick
NOTE:
Oil the hinge at the begining of the heating season
with a light oil
The unction box is best mounted on the side of the furnace
about 1 in back and in from the top of the sheet metal
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on the right side will work
SF1500, SF2500, SF3500.
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SF3500 It’s intention is to represent the approximate
location of the arious controls This drawing may also be
used as a recommendation for routing of the wiring and
approximate dimension of control spacing
Please note that this
drawing is for reference
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installation will ary
Furnace Installation
Installing Wood/Coal High Limit Switch-
SF2600 only
First install the sheet metal sides as described in the
pre ious section Install the snap disc switch into the hole
on the right side sheet metal Then mount the open backed
unction box around the snap switch Proceed with wiring as
shown on page 10 Also refer to Figure D in this section
Mounting The Oil Burner-
SF2600 only
Remo e oil burner unit from it’s box Loosen the four bolts in
the pipe on the front of the furnace Insert the nose of the oil
gun into the pipe Before sliding the oil burner all the way in
apply the gasket around the nose of the oil gun by wrapping
it around the nose ext slide the oil burner into the pipe
and secure it by tightening the four bolts around the collar
Be sure to tighten the bolts e enly to locate the oil burner
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should be done by an experienced oil burner technician with
the proper e uipment Refer to the SF2600 wiring diagram
on page 10 and the oil burner manual for proper burner set-
up There is also a section at the end of this manual with
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Venting Guidelines.
our Harman hot-air furnace must be ented to it’s own
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in si e The chimney must be capable of pro iding a draft
reading of at least 06” water column on a draft meter in
order to function properly The Chimney must be a minimum
of 16 ft high and must be two feet higher than anything
within 10 ft The chimney must also be at least 3 ft higher
than the point at which it exits or passes by the roof A
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excessi e draft Any hori ontal sections of connector pipe
must ha e at least 1/4 in per foot rise Limit the number of
elbows to two or less All oints in the connector pipe must
be secured with sheet metal screws
Assembly.
Bolt the shaker handle to the block on the lower left side of
the furnace using the bolts and lock-washers pro ided
Bolt the two manual draft controls to the front load door
Proper installation allows the draft controls to open
approximately 1/2” from the door surface See Figure 1
