STA-RITE SR200NA Service Manual page 40

SECTION FOUR – Routine Maintenance and Professional Servicing
Automatic Gas Shutoff (AGS) Switch
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The Automatic Gas Shutoff (AGS ) Switch is located in
the middle well of the Manifold on the right-hand side
under the right-hand Switch Cover. The AGS Switch is
marked with a yellow dot to differentiate it from the
High Limit Switch, which is black.
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The AGS Switch prevents the Heat Exchanger output
from exceeding 140° F, ±8° F (60° C, ±3° C).
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To replace the AGS Switch:
1. Turn off the filter pump and all electrical power to
the heater.
2. Unbolt and remove Upper Left and Upper Right
Jackets from heater to reach switch cover bolt.
Automatic Gas Shutoff
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3. If the heater is below the water level of the pool,
4. Remove the Drain Plug under the Manifold to drain
5. Remove the Switch Cover.
6. Disconnect the AGS wires from the Switch.
7. Unscrew the AGS Switch from the Manifold.
8. To replace the AGS Switch, reverse Steps 1
4-8
(AGS) Switch
Yellow dot indicates that
switch opens at 140° F
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close isolation valves to avoid draining the pool.
the heater.
through 7. Be sure to teflon tape the threads
when reinstalling the AGS Switch.
P/N
42002-0025S