SECTION FOUR – Routine Maintenance and Professional Servicing
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The Water Pressure Switch is located on top of the
Manifold.
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The Water Pressure Switch permits the Burner to fire
only when there is enough water flow through the
heater to allow normal operation. It opens when water
flow to the heater is insufficient.
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To replace the Water Pressure Switch:
1. Turn off the pump and all electrical power to the
heater .
2. Unbolt and remove Upper Left and Upper Right
Jackets from the heater.
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. Disconnect the wires attached to the Water Pressure
Switch.
6. Unscrew the Water Pressure Switch and replace it
with a new one.
7. Make sure the newly installed Water Pressure
Switch is properly adjusted. Refer to the Pressure
Switch settings below.
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For deck-level heater installations, the Pressure Switch
is factory-set at 3 psi (20.6 kPa). If the pool water level
is 1-2 feet (.3-.6 M) below or 1-5 feet (.3-1.6 M) above
the Pressure Switch level, reset the switch so that it is
open when the pump is off and closed when the pump
i s running. Turn the star-wheel on the switch clockwise
to raise setting (heater below the pool) and counter-
clockwise to lower the setting (heater above the pool).
Test the switch after resetting (see the Heater
Installation section and Figure 2-17, Page 2-17).
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When the pool water level is more than 2 feet
(.6 M) below or 5 feet (1.6 M) above Pressure Switch
level, a Pressure Switch is no longer adequate. A Flow
Switch must be installed instead. Minimum rating of
Flow Switch must match minimum flow rate of heater
(see Page 1-6).
4-6
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