Blower Testing & Replacement - Bradford White LC2PV50H76N Service Manual

Condensing PV Series
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 (Phillip's screw driver) from control access cover
on blower assembly and remove cover (see photo 7).
Y
Disconnect pressure switch
Does blower energize
within 2 minutes?
N
7
Does blower energize after
Y
2 minutes, run for 30
seconds and shut down?
N
Disconnect cord set
Y
shown in photo 10. Is
there 115VAC across
locations 1 & 2 shown in
figure 11?
N
Replace blower
Replace cord set.
N
Determine power
Is there
source problem
115VAC at wall
outlet?
Y
Y
Is power cord
Repair or replace
damaged?
power cord.
N
Replace blower.
tubing from blower.
(see photo 8)
8
See pressure switch
testing.
(Page 19)
Is there 115VAC
Y
across the locations
2 & 6 shown in figure
11?
N
Incorrect supply
voltage polarity
Reconnect cord set
Y
shown in photo 10, is
there 115VAC between
yellow and green wires?
(see photo 12)
N
N
Does cord set have
electrical continuity?
Y
Replace gas
control.
and correct.
115 volt potential exposure. Use
caution to avoid personal injury.
Connect manometer to
pressure tap of blower.
(see photo 8)
With blower running, and exhaust
blower, is there a negative pressure
Is there 115VAC across
Determine voltage
N
the yellow and green
problem and
correct.
(see photo 12)
9
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.
WARNING
Disconnect vent system
from top of blower and
remove vent adapter.
(see photo 9)
adapter removed from the top of
of -2.15" to -2.30" w.c.?
N
Y
Replace blower
wires?
10
11
Yellow wire
Y
Blower OK
12
21
21