38 USE ONLY GENUINE REPLACEMENT PARTS
THERMISTOR: The thermistor monitors the return water temperature to thermostatically control pool and spa water to the selected
temperature and to shut the heater off as the return water reaches 104 F. See Figure28: Heat Exchanger Header.
To replace the thermistor:
1. Turn pump, gas supply, and heater power “OFF”.
2. Drain the heat exchanger of all water.
3. Remove the front access panel.
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 procedure above to reassemble unit.
WATER PRESSURE SWITCH: The water pressure switch (see Figure28: Heat Exchanger Header) 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 pressure switch may
require adjustment to compensate for the change in static head pressure. If adjustment is needed, the procedure is detailed in
WATER PRESSURE SWITCH TEST / ADJUSTMENT PROCEDURE.
NOTICE: Do not operate the pool heater without the function of a properly adjusted pressure switch or flow switch.
To replace the pressure switch:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the (4) screws securing the upper end panel and remove the panel.
3. Remove the (2) screws securing metal trim panel to the upper trim panel.
4. Remove the wires from the pressure switch.
5. Unscrew switch from header.
6. Replace the pressure switch. Use new sealant on the pressure switch threads before re-installing.
7. Reverse procedure above to reassemble unit.
TRANSFORMER: The transformer converts the field supply voltage (either 240 VAC or 120 VAC) to a 120 VAC output for blower
and igniter power, and a 24 VAC output for powering the ignition control board, control circuits, and gas valve. See Figure23:
Location of Components for its location.
To replace the transformer:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel.
3. Unplug transformer from the fuse board
4. Remove the (2) screws that secure the transformer to the control box.
5. Replace the transformer.
6. Reverse procedure above to reassemble unit.
BYPASS SERVICE CARTRIDGE: The following procedure details how to remove and replace the internal pressure bypass valve in
the header. This procedure applies only to plastic (non-ASME) headers. On bronze (ASME) headers, the bypass service cartridge is
not field-replaceable. Please contact technical support for more information.
1. Turn pump, main gas valve, and heater power off.
2. Drain heat exchanger according to instructions in Section III of this manual.
3. Remove 6 screws and remove the upper plastic heater side panel, to allow access to the header.
4. Remove the cartridge retaining nut from end of header (see Figure28).
5. Slide out the bypass cartridge from the end of the header (see Figure28).
6. Check the function of the bypass valve to ensure the valve flaps rotate smoothly on the shaft, and the spring fully closes the
valve.
7. Apply silicone O-ring grease (Jack’s 327 Multilube p/n SP032712, or equivalent) on O-ring seals on the bypass cartridge before
inserting into the header.
8. Insert bypass cartridge into header with the arrow on the end of the cartridge pointing up.
9. Re-install cartridge retaining nut. Nut should be tightened hand-tight only. DO NOT OVER-TIGHTEN.
10. Re-install the upper plastic heater side panel.
11. Reverse procedure above to reassemble unit.
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