Blower Temperature Switch Testing & Replacement - Bradford White RG1PV40SN19 Service Manual

PV Series
Blower Temperature Switch
Testing
Position power switch on gas control to the
"OFF" position.
Step 1.
Remove the three screws (T20
Torx driver) from control access
cover on blower and remove cover
(see photo 14).
Step 2.
Locate blower temperature switch
(see photo 15).
Switch Setting
Opens on rise @ approximately 155°F
Auto reset on fall @ approximately 130°F
Cool switch below
130°F
Disconnect wire leads to
switch. Using a multi-meter set
to the ohms setting, is there
continuity between switch
terminals?
Y
Reconnect wire leads and
observe heater operation. Do
exhaust gas temperatures rise to
or above 170° with vent
connected?
N
Do switch Y
contacts open?
N
Switch OK?
26
BLOWER TEMPERATURE
SWITCH LOCATION
N
Replace switch
(see page 20)
N
Y
Do switch contacts
open?
Replace switch
(see page 23)
115-volt potential exposure. Use
caution to avoid personal injury.
AIR MIXING INLET
Exhaust temperature is
Y
too hot
26
VII
WARNING
WARNING
Common causes for high
exhaust temperatures
1. Vent length is below
minimum allowable.
2. Vent diameter not to
specifications.
3. Restricted dilution air inlet.
4. Missing or deteriorated
flue baffle.
5. Gas pressure is out of
specification.