PDV Series
20
Service Procedure IV
Blower Testing and
Replacement
Blower Testing & Replacement
Step 1. Position gas control power switch to
the “ON” position and adjust control to call for heat.
Step 2. Remove the three screws (Phillips screwdriver) from control access cover
on blower assembly and remove cover (see photo 7).
WARNING
115 volt potential exposure. Use
caution to avoid personal injury.
Disconnect pressure switch
tubing from blower.
(see photo 8)
Connect manometer to
pressure tap of blower.
(see photo 8)
Disconnect vent system
from top of blower and
remove vent adapter.
(see photo 9)
See pressure switch
testing.
(Page 19)
Y
N
Disconnect cord set
shown in photo 10. Is
there 115VAC across
locations 1 & 2 shown in
photo 11?
Y
N
Is power cord
damaged?
Replace blower.
Is there
115VAC at wall
outlet?
Incorrect supply
voltage polarity.
With blower running, and exhaust
adapter removed from the top of
blower, is there a negative pressure
of -2.80” to -3.2” w.c.?
Repair or replace
power cord.
Blower OK.
N
N
Y
Replace cord set.
Y
Replace gas
control.
Replace blower.
Is there 115VAC across
the yellow and green
wires?
(see photo 12)
Determine voltage
problem and
correct.
Does cord set have
electrical continuity?
N
Y
N
Y
Y
N
Replace
blower.
N
Y
Does blower energize
within 2 minutes?
N
Y
Does blower energize after
2 minutes, run for 30
seconds and shut down?
7
8
Is there 115VAC
across the locations
2 & 6 shown in photo
11?
Determine power
source problem
and correct.
Reconnect cord set
shown in photo 10, is
there 115VAC between
yellow and green wires?
(see photo 12)
N
9
10
11
12
Green wire
Insert the volt meter lead in the back of the connector to
make contact with the yellow wire. Use the ground screw to
make contact with the green wire.
Y
Yellow wire
20
