Download SERVICE MANUAL - Rogers Supply

TTW SERVICE PROCEDURE IV
Blower Testing and Replacement
WARNING
115 volt potential exposure. Use caution when
making voltage checks to avoid personal injury.
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 (Phillips Screw driver)
from control access cover on blower assembly and
remove cover (see photo 7).
Does blower energize
Within 2 minutes?
Y
Connect
manometer to
pressure tap of
blower.
(see photo 8)
Disconnect
pressure switch
tubing from blower.
(see photo 8)
N
Pressure tap
8
7
Disconnect vent
system from top of
blower and remove
vent adapter.
(see photo 10)
With blower running, and exhaust
adapter removed from top of
blower, is there a negative
pressure of -2.15" to -2.30" W.C.?
N
N
Determine voltage
problem and correct.
Y
10
9
Pressure
switch tubing
Does blower energize after
2 minutes, run for 30
seconds and shut down?
Remove exhaust
adapter
See pressure
switch testing
Page 18
Is there 115vac across
blue and green wires
(see photo 13)
11
Y
Y
Blower OK
Replace blower
12
N
Disconnect cord set
shown in photo 9. Is
there 115VAC across
terminals shown in
photo 11
Y
Incorrect supply
voltage polarity
N
Determine
power source
problem and
correct.
Y
Check power cord
for damage.
N
Replace blower
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Y
N
N
Is there 115 VAC
at wall outlet?
Is there 115VAC
across terminals
shown in photo 12 ?
Y
Repair or replace
power cord
Replace
cord set
Reconnect cord set
shown in photo 9, is
there 115VAC between
blue wire and green
ground wire
(see photo 13)
N
Does cord set
N have electrical
continuity?
Y
Replace blower
Green ground
wire
Y
13
Blue wire
Replace
gas control
Shown with pressure
switch removed.
Page 20