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UPV75 Service Procedure IV – Blower Testing and Replacement
Blower Testing
Step 1. Position gas control power switch to "ON"
position and adjust control to call for heat.
Step 2. Remove the three screws (T20 Torx driver) from control access
cover on blower assembly and remove cover (see photo 7).
With power in
"ON" position
Y
does blower
energize within
2 minutes?
N
Does blower
energize after 2
Y
minutes, run for
30 seconds and
shut down?
N
Remove the head screws
(1/4" driver) as shown in
photo 9. Then disconnect
the cord shown in photo
10, Is there 115VAC
across the terminal
shown in photo 11?
N
N
Is there 115VAC
at wall outlet?
Y
Check power
cord for damage.
N
Replace blower.
20
Disconnect
pressure
switch tubing
from blower
(see photo 8).
Determine
voltage problem
See
and correct.
pressure
switch
testing,
Replace
page 18.
blower.
Is there 115VAC
Y
across terminals
shown in photo 12?
N
Incorrect supply
voltage polarity.
Determine power source
problem and correct.
Y
Repair or replace
power cord.
Pressure tap
10
115 volt potential exposure.
Use caution to avoid personal injury.
Disconnect
Connect
vent system
manometer to
pressure tap
blower (see
of blower
(see photo 8).
N
Is there
115VAC
across blue
and green
wires (see
Y
photo 13).
Reconnect cord shown in
Y
photo 10, is there 115VAC
between blue harness wire
and green harness wire
(see photo 13).
Does the cord have
electrical continuity?
8
Pressure switch
tubing
11
WARNING
from top of
photo 10).
With blower running,
and exhaust adapter
N
removed from top of
blower, is there a
negative pressure of
-2.15: to -3.15" W.C?
Y
Replace blower.
N
N
Replace cord.
Y
Replace gas control.
Blower mounting
12
7
Y
Blower
OK.
9
screws
13
20
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