23
Condensing PV Series
23
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).
WARNING
115 volt potential exposure. Use
caution to avoid personal injury.
Disconnect wire leads to switch.
Using multi-meter, set to ohms
setting. Is there continuity
between the switch terminals?
Reconnect wire leads and
observe heater operation. Does
the exhaust gas temperatures
rise to or above 160°F with vent
connected?
Switch OK.
Do switch
contacts open?
Switch Setting
Opens on rise @ approximately 155°F
Auto resets on fall @ approximately 135°F
Do switch
contacts open?
Replace switch.
(see page 24)
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.
Cool switch to
below 130°F.
Exhaust temperature
is too hot.
Replace switch.
(see page 24)
Blower temperature switch
13
N
N
Y
Y
Y
Y
N
N
