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older d uct s ystems were notdesigned to
provide staticpressure. Theytypically
feature special reducing fittings ateach
branch runandtackblock ends on the
trunk ducts. T hese systems m ay require
modification to provide s ome resistance
totheairflow to prevent over-amping
of
thedirect d rive blower motor. Selecting a
lowerblowerspeedmaycorrect t his
problem.
Direct d rive blower speeds areadjusted
bychanging the"hot" w ires tothemotor
winding connections. Pleasereferto
wiring diagram inAppendix Borthewir-
ingdiagram label a ffixed tothefurnace.
THE
NEUTRAL
WIRE
(normally
the
white wire) IS NEVER MOVED TO AD-
JUST THE BLOWER SPEED,
I_CAUTION
]
DO NOT CONNECT
POWER
LEADS
BETWEEN
MOTOR
SPEEDS,
THE
NEUTRAL
WIRE MUST ALWAYS
BE
CONNECTED
TO THE MOTOR'S DES-
IGNATED NEUTRAL TERMINAL,
It is possible
and acceptable
to use a
single blower speed for both heating and
cooling modes. The simplest
method to
connect the wiring from both modes is to
use a "piggy-back
connector" accommo-
dating both wires on a single motor tap.
It is also acceptable
to connect the se-
lected motor speed with a pigtail joined
to both heating and cooling speed wires
with a wire nut. As a safety precaution
against accidental
disconnection
of the
wires by vibration,
it is advisable to se-
cure the wire nut and wires with a few
wraps of electricians tape.
If the joining
of the blower
speed
wiring is done in the furnace junction
box, tape off both ends of the unused
wire.
IACAUTION
I
DISCONNECT
THE POWER
SUPPLY
TO THE FURNACE
BEFORE
OPEN-
ING THE
BLOWER
ACCESS
DOOR
TO SERVICE
THE AIR FILTER,
FAN
AND MOTOR, FAILURE TO SHUT OFF
POWER
COULD
ALLOW
THE
BLOWER
TO
START
UNEXPECT-
EDLY, CREATING A RISK OF DEATH
OR PERSONAL
INJURY,
Do not use the blower speed wires as
a source of power to accessories
as
electronic air cleaners and humidifier
transformers.
The unused motor taps
auto-generate
sufficiently
high volt-
ages
to
damage
accessory
equip-
ment. Use the terminals
provided on
the electronic fan timer.
IACAUTION
I
Do not start the burner or blower fan
unless the blower access door is se-
curely in place,
Additional
ST9103
Fan Timer
Control
information is in Appendix A, Tables, and
in Appendix B, Wiring Diagrams.
HUMIDIFIER
A humidifier
is an optional
accessory
available through most heating supplies
outlets. Installation should be carried out
in accordance
with the humidifier manu-
facturer's
installation
instructions.
Water
or water
droplets
from the
humidifier
should not be allowed to come into con-
tact with the furnace heat exchanger.
Do
not use direct drive motor connections as
a source of power for 120 VAC humidifi-
ers and humidifier transformers.
OIL BURNER
The oil burner must align properly with
the cerafelt fiber chamber (firepot). The
cerafelt fiber
chamber
is initially quite
soft,
but hardens
and
becomes
quite
brittle after the first firing. The firepot is
held in place
by a retaining
bracket;
however, it is possible for the firepot to
shift if subjected to rough handling during
transit.
IACAUTION
I
BEFORE
OPERATING
THE
FUR-
NACE CHECK BURNER ALIGNMENT
WITH
COMBUSTION
CHAMBER,
THE END CONE OF THE AIR TUBE
MUST
BE CENTRED
TO THE AC-
COMODATING
RING PROVIDED
IN
THE DESIGN OF THE COMBUSTION
CHAMBER, ADJUST ALIGNMENT
AS
NECESSARY
BEFORE
THE
FIRST
FIRING,
Figure 4: Horizontal Smoke Test Port Location
Figure 5: Vertical Smoke Test Port Location
Horizontal Flue Connection
Chimney
flue pipe
Draft regulator
Location for
sampling hole, 1/4" diam. -_
[]
Fumace
m
•
i
m
m
Vertical Flue Connection
Location
for
samplinghole
_
Note A
breeching_
'
0
|
.
m
m
m
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