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46
4. Unscrew the high limit switch from the header.
5. Replace the high limit switch. Use new sealant on the high limit switch threads before reinstalling.
6. Reverse the above procedure to install the high limit switch.
EXHAUST GAS TEMPERATURE LIMIT:
The exhaust gas temperature limit monitors the fl ue gas temperature above the heat exchanger and trips if
temperature rises high enough to indicate that the heat exchanger has been damaged and is no longer trans-
ferring heat to the pool water effectively. If this limit trips, effort must be made to rectify the situation has
damaged the heat exchanger. This is generally due to low water fl ow, poor water chemistry, or a combination
of these and other factors. Replace the limit as well as the heat exchanger before operating the unit again.
Running the unit without replacing the heat exchanger after this limit trips could damage the entire unit and
will not be covered by the manufacturer's warranty. To replace the exhaust gas temperature limit:
1. Turn pump, gas supply, and heater power "OFF".
2. Remove the upper end cap on the header side of the unit (see Figure 8).
3. Unplug the two wires from the exhaust gas temperature limit located in the fl ue collector panel above
the middle of the header.
4. Unscrew the (2) screws securing the limit to the panel and remove the limit and gasket.
5. Place the new limit and gasket in place and reverse the above steps to complete the procedure.
THERMISTOR:
The thermistor monitors the
1.
Turn pump, gas supply, and heater power "OFF".
2.
Drain the heat exchanger of all water.
3.
Remove the front access panel. It is secured with (4) screws.
4.
Unplug the thermistor connector from the ignition control board.
5.
From outside the heater, pull the thermistor leads out of the control box and through the hole in the
heater chassis.
6.
Unscrew the thermistor from the inlet side of the header.
7.
Replace the thermistor. Use new sealant on the thermistor threads before re-installing.
8.
Reverse steps above to complete the procedure.
WATER PRESSURE SWITCH:
The water pressure switch (Figure 24) is preset at the factory for most typical, deck level installations.
When the heater is located above or below the level of the pool or spa, the
adjustment to compensate for the change in static head pressure. If adjustment is needed, the procedure is
detailed in Section III, under Water Pressure Switch Test / Adjustment Procedure.
ATTENTION:
switch or fl ow switch.
To replace the pressure switch:
1. Turn pump, gas supply, and heater power "OFF".
2. Unplug the high limit terminals from the main wire harness.
3. Remove the (4) screws securing metal trim panel around the header.
return water temperature. See Figure 24. To replace the thermistor:
Do not operate the pool heater without the function of a properly adjusted pressure
pressure switch may require
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Table of Contents
Troubleshooting
