Specifications

2. Temperature Control - The Legacy Models are
equipped with an electronic control which senses
water temperature by means of a thermistor and
controls heater operation to bring the water to
the temperature selected. It has an option for two
separate thermostat settings which are typically
used to set pool and spa temperatures.
3. Ignition Control - The ignition control provides
energy for ignition of the air/gas mixture, monitors
the ame and controls the gas valve. Then it
applies electrical power to a "hot surface" igniter.
When the igniter is hot enough, the ignition control
opens the gas valve. It is designed to monitor and
control the igniter once it conrms the existance
of proper ignition of the gas. It is also designed to
provide an appropriate post-purge period to ensure
proper removal of any unburned gas after the
burner is shut off.
4. Igniter - The hot surface igniter is a crystalline
element which becomes very hot when electri-
cal power is applied to it. The hot surface igniter
directly ignites the air/gas mixture in the com-
bustion chamber. LRZE heaters from Revision
J forward use a spiral igniter (see Figure 28).
Previous versions use a at surface igniter (see
Figure 29).
Figure 28. Spiral Igniter
Figure 29. Flat Surface Igniter
5. Flame Sensor - The ame sensor is the electrode
through which the ignition control detects "recti-
cation" of current passed through the ame. Inade-
quate rectication indicates an unsatisfactory ame
condition. The rectication signal can be measured
by attaching the leads of a DC ammeter to the two
(2) pins on the connector of the ignition control
labeled "FC". A wire harness, available from
Zodiac Pool Systems, Inc., makes it easier to attach
the voltmeter leads. The ame current should not
be less than 1.5 micro-amps. If the ame signal is
less than 1.5 micro-amps, verify correct gas supply
and manifold pressures.
6. Limit Switches - Two limit switches prevent
excessive water temperature - one at the heat
exchanger outlet and one for water leaving the
heater. If either senses excessive temperature,
burner operation is interrupted.
7. 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 lter is blocked, the pressure switch prevents
operation of the burner.
8. Roll-Out Switch (Fusible Link) - This is a single-
use switch which detects abnormal temperature in
the component compartment of the heater. It is a
roll-out switch (fusible link) which is held to the
combustion chamber just above the burner tray by
a sheet metal bracket. Excessive temperature in the
component compartment, possibly due to a blocked
ue or ame roll-out, will cause the switch to fail.
This opens the safety circuit which shuts off the
gas valve and shuts the heater down.
9. Vent Temperature Limit - This is a single-use
switch which detects abnormal temperature in the
vent system. It is mounted to the ue collector
assembly. Excessive temperatures will cause the
switch to open. Excessive temperatures can be
caused by inadequate water ow or a damaged heat
exchanger. The vent temperature limit will open
the safety circuit which shuts off the gas valve and
shuts down the heater.
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 troubleshooting guide because the safety circuit is
connected in series.
NOTE Pump must be running during the
troubleshooting procedure.
These procedures require a Volt-Ohm meter
with a minimum 0-250VAC voltage range, and 1-1000
Ohm resistance range. Figure 30 shows the power
and control circuits and where to take measurements.
Location numbers in circles have been added, and
will be referenced in the following sections.
Where test points are shown at circuit board
connectors, the probe of the meter can be carefully
pushed into the connector along side of the wire at the
connection to be measured.
Page 37
ENGLISH
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
|
Installation and Operation Manual