SECTION FOUR – Routine Maintenance and Professional Servicing
LLLLooooccccaaaattttiiiioooonnnn
The High Limit Switch is located in the lowermost well
of the Manifold under the left-hand Manifold Switch
Cover. It is black to differentiate it from the AGS
Switch, which is marked with a yellow dot.
FFFFuuuunnnnccccttttiiiioooonnnn
The High Limit Switch prevents the Heat Exchanger
outlet temperature from exceeding 135° F, ±8° F
(57° C, ±3° C).
SSSSeeeerrrrvvvviiiicccciiiinnnngggg PPPPrrrroooocccceeeedddduuuurrrreeee
To replace the High Limit 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 the heater to reach switch cover bolt.
3. If the heater is below the pool water level, close iso-
lation valves to avoid draining the pool.
4. Remove the Drain Plug under the Manifold to drain
the heater.
5. Remove the Switch Cover.
6. Disconnect the High Limit wires from the Switch.
7. Unscrew the High Limit Switch from the Manifold.
8. Replace the High Limit Switch by reversing Steps 1
through 7 above. Be sure to teflon tape the threads
when reinstalling the High Limit Switch.
4-7
High Limit Switch
2654 1096
PRE
SS
TA
B
VENT
PILOT
O
F
F
OFF
O
N
ON
High Limit Switch
P/N 42001-0063S
