Blower Temperature Switch Testing & Replacement - Bradford White Condensing PV Series Service Manual

Condensing PV Series
Blower Temperature Switch Testing
Step 1. Position power switch on gas control to the
"OFF" position.
Step 2. Locate blower temperature switch (see photo
13).
Switch Setting
Opens on rise @ approximately 155°F
Auto resets on fall @ approximately 135°F
Cool switch to
below 130°F.
Disconnect wire leads to switch.
Using multi-meter, set to ohms
setting. Is there continuity
between the switch terminals?
Y
Reconnect wire leads and
observe heater operation. Does
the exhaust gas temperature
rise to or above 160°F with vent
connected?
N
Do switch
contacts open?
N
Switch OK.
N
Replace switch.
(see page 24)
N
Y
Do switch
contacts open?
Y
Replace switch.
(see page 24)
PV SERVICE PROCEDURE V
Blower Temperature Switch Testing &
115 volt potential exposure. Use
caution to avoid personal injury.
13
Y
Exhaust temperature
Common causes for high exhaust temperatures
Step 1. Vent length is below minimum allowable.
Step 2. Vent diameter not to specification.
Step 3. Missing or deteriorated flue baffle(s).
Step 4. Gas pressure is out of specification.
Replacement
WARNING
Blower temperature switch
is too hot.
23
23