STA-RITE SR200NA Service Manual page 42

SECTION FOUR – Routine Maintenance and Professional Servicing
Stack Flue Sensor / Stack Flue Switch
L L L L o o o o c c c c a a a a t t t t i i i i o o o o n n n n
The Stack Flue Switch (ES2 - Heaters built before
3/1/2000) is located on the Combustion Chamber Flue
Collar below the Vent Body.
The retrofitted Flue Temperature Probe Switch (ES2 - it
replaces the Stack Flue Switch on heaters built before
3/1/2000) is located on the Exhaust Elbow.
The Stack Flue Sensor (SFS - Heaters built after
3/1/2000) is located on the Exhaust Elbow.
N N N N O O O O T T T T E E E E : : : : The Stack Flue Sensor, the Probe, and the Stack
Flue Switch must all be sealed with RTV at installation.
F F F F u u u u n n n n c c c c t t t t i i i i o o o o n n n n
The Stack Flue Switch and the Probe open if the flue
gas output temperature exceeds 500° F (260° C). The
Stack Flue Sensor monitors the exhaust temperature
and shuts down the heater if it exceeds 500° F (260° C).
S S S S e e e e r r r r v v v v i i i i c c c c i i i i n n n n g g g g P P P P r r r r o o o o c c c c e e e e d d d d u u u u r r r r e e e e
To replace the Flue Temperature Probe Switch,
See Page 4-41.
To replace the Stack Flue Switch or Sensor:
1. Turn off the filter pump and all electrical power to
the heater.
S S S S a a a a f f f f e e e e t t t t y y y y P P P P r r r r e e e e c c c c a a a a u u u u t t t t i i i i o o o o n n n n s s s s : : : :
Burn hazard. If heater has been operat-
ing, allow it to cool for at least half an hour before
touching the Stack Flue Switch, Stack Flue Sensor,
the Combustion Chamber Collar, or the Exhaust
Elbow.
Stack Flue
Sensor (SFS)
P/N 42002-0024S
See Page 4-41 for Retrofit
Probe Information
2. Allow the heater to cool for at least half an hour
before proceeding.
3. Unbolt and remove the Upper Left and Upper Right
Jackets from the heater.
4. Disconnect the wires from the Stack Flue
Switch/Sensor.
5. S S S S t t t t a a a a c c c c k k k k F F F F l l l l u u u u e e e e S S S S w w w w i i i i t t t t c c c c h h h h : : : : This switch is sealed in place.
Do not remove or disturb it. If you are replacing
this switch with a probe or sensor, remove the wires
from the switch and run them to the probe/sensor.
S S S S t t t t a a a a c c c c k k k k F F F F l l l l u u u u e e e e S S S S e e e e n n n n s s s s o o o o r r r r : : : : Reach into the Exhaust Elbow;
unscrew the locknut on the Sensor and remove it.
Unscrew the Sensor from the Exhaust Elbow. Clean
the RTV off of the joint.
N N N N O O O O T T T T E E E E : : : : The Stack Flue Sensor requires the new
smart control board (Model #0300-100001).
6. To replace, reverse Steps 1 through 5 above.
N N N N O O O O T T T T E E E E : : : : Be sure to seal the Switch/Sensor with RTV
in the joint.
See Page 4-11 for Control Board setup and Complete
Stack Flue Identification. See Page 4-29 for more infor-
mation on the new Control Board. See Page 4-41 for
more information on the Flue Temperature Probe
Switch.
Fire hazard. For enclosed installations,
Stack Flue Switch must be replaced with a Flue
Temperature Probe Switch, Page 4-37.
4-10
Stack Flue
Switch (ES2)
P/N 42001-0062S
(Obsolete)
3701 0600