Page 39
ENGLISH
Installation and Operation Manual
|
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
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 has
sophisticated means to sense ignition and ame
condition so that unburned gas will not escape.
Once the ignition control has sensed ame, it de-
energizes the igniter. After the burner is shut off,
the ignition control provides a post-purge period.
4. Igniter - The hot surface igniter is a ceramic
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 combus-
tion chamber.
5. Flame Sensor - The ame sensor is the electrode
through which the ignition control detects "rec-
tication" of current passed through the ame.
Inadequate rectication indicates an unsatisfac-
tory ame condition. The rectication 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 sin-
gle-use switch which detects abnormal tempera-
ture 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 tempera-
ture 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.
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.
Pumpmustberunningduringthe
troubleshootingprocedure.
These procedures require a Volt-Ohm meter
with a minimum 0-250VAC voltage range, and
1-1000 Ohm resistance range. Figure 28 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.
The electrical power supply can be checked with
the heater not set to re. All other procedures need to
be checked with power correctly supplied to the heater,
all external devices set so that the heater is allowed to
re and the heater's thermostat set so that there is a call
for heat.
As stated at the beginning of the manual, some
of these procedures are hazardous. Only a qualied
service technician should service the heater.
The electrical components of the Legacy Model
LRZ electronic pool heaters are designed to operate
with supply voltage ranging from 102V to 132V at 60
Hz if connected to a nominal 120 Volt power supply,
or 204V to 264V at 60 Hz if connected to a nominal
240 Volt power supply. Measure supply voltage at
the power supply leads where they enter the heater to
verify that the correct voltage is supplied to the heater.
If no voltage is present, correct this external
power supply problem to the heater. Circuit breakers,
time clock settings or similar devices may be the
problem. Voltage outside of the above ranges may
be due to poor wiring, poor connections, other loads
such as air conditioning compressors or to an electric
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