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Page 29
Blower Testing (cont’d)
Does blower
energize within
2 minutes?
Disconnect pres-
sure switch tub-
ing from blower
(see photo 3).
Connect manome-
ter to pressure tap
of blower (see
photo 3).
Disconnect vent
system from top of
blower and remove
vent adapter (see
photo 5).
Does blower
e
nergize after
2 minutes, run
for 30 seconds
and shut
down?
Disconnect
cord set in
photo 9. Is
there 115VAC
across termi-
nals shown in
photo 11?
Is there
115VAC at
wall outlet?
Replace blower.
Repair or replace
power cord.
Determine
power source
problem and
correct.
Is there
115VAC
across termi-
nals shown
in photo 7?
Incorrect supply
voltage polarity.
Reconnect cord set
shown in photo 4.
Is there 115VAC
between blue wire
and ground wire
(see photo 8).
Replace blower.
Does cord set
have electrical
continuity?
Replace cord
set.
Replace gas
control.
See pressure
switch testing
on page 25.
With blower running and
exhaust adapter removed
from top of blower, is there
a negative pressure of –
2.15” to –2.30” W.C.
Blower OK.
Is there 115VAC across blue
and green wires (see photo 8).
Replace blower.
Determine volt-
age problem and
correct.
5
Remove exhaust
adapter
4
3
P
ressure tap.
Pressure
switch tubing
6 7
8
Green ground
wire
Blue wire
Shown with pressure
switch removed
Blower Testing
Y
Y
Y
Y
Y Y
Y
Y
Y
N
Check power cord
for damage.
Y
N
N
N
N
N
N
N
N
N
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