Electrical Troubleshooting - Jandy Lite2 Installation And Operation Manual

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AIR
FLOW
Figure 22. Atmospheric Combustion System
the pool/spa water must be monitored with an
accurate pool thermometer. The control has a
dual interface to allow switching between
separate pool and spa settings or operational and
standby settings.
3. Hot Surface Ignition - The LD heater relies on
a hot surface igniter to ignite the burners when
the water temperature going through the heater
falls below the controller's set point. When the
heater's controller calls for heat, a signal is sent
to the electronic ignition control, which energizes
the hot surface igniter.
4. Transformer - The transformer is supplied with
the available line voltage, either 115 VAC or 230
VAC. The transformer then converts the voltage
to 24 VAC which is placed across the tempera-
ture controller and safety circuit of the heater. If
this current is broken at any time, the gas valve is
immediately shut off and the heater stops firing.
5. Limit Switches - Two limit switches prevent
excessive water temperature - one within the
heat exchanger and one for water leaving the
heater. If either senses excessive temperature,
burner operation is interrupted.
EXHAUST
6. Water Pressure Switch - This control senses
whether or not water is available to the heater by
measuring back pressure inside of the heat
exchanger. If the pool water pump fails or the
water filter is blocked, the pressure switch
prevents operation of the burner.
7. Fusible Link - This is a single-use switch which
detects abnormal temperature in the component
vestibule. It is a fusible link which is held to the
inner panel just above the burner tray by a sheet
metal bracket. Excessive temperature in the
component compartment, possibly due to a
blocked flue or flame roll-out, will cause the link
to fail. This opens the safety circuit which shuts
off the gas valve and shuts the heater down.
8. Ignition Control - The ignition control receives
a signal from the heater's temperature controller
when there is a call for heat. It then checks the
safety circuit and coordinates the timing for the
energizing of the hot surface igniter and the
opening of the gas valve.

10.4 Electrical Troubleshooting

This section describes procedures for checking
the electrical power and control components of the
heater one at a time and in the order they appear in the
control circuit. It is important to follow the sequence of
this trouble shooting guide because the safety circuit is
connected in series.
VENT TOP
FLUE COLLECTOR
HEAT EXCHANGER
COMBUSTION CHAMBER
BURNER
BURNER TRAY SHELF