Blower Temperature Switch Testing
Blower Temperature Switch Testing (cont’d)
Switch Setting
Opens on rise @ approximately 165oF
Auto resets on fall @ approximately 160oF
Cool switch to
below 160oF
Disconnect wire leads to switch. Using
to the ohms setting. Is there
Replace switch
continuity between the switch
terminals?
(see page 33).
Common causes for high
exhaust temperature
Y |
|
|
|
| |
|
| N |
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| |
Reconnect wire leads and ob- | Y |
|
|
| |
serve heater operation. Do | Do switch | Y | Exhaust | ||
| |||||
exhaust gas temperatures |
| contacts |
| temperature | |
rise to or above 170oF with |
| open? |
| is too hot. | |
vent connected? |
|
|
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| |
N |
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| |
Y | Replace switch |
|
| ||
Do switch con- |
|
| |||
tacts open? |
| (see page 33). |
|
| |
N
Switch OK
1.Vent length is below mini- mum allowable
2.Vent diameter not to speci- fication
3.Restricted dilution air inlet
4.Missing or deteriorated flue baffle
5.Gas pressure is out of specification
Page 32
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