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Jandy® Legacy™ Model LRZM Pool/Spa Heater by Zodiac®
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Installation and Operation Manual
2.
Temperature Control
- The Jandy Legacy
controller is an electronic control which senses
water temperature by means of a thermistor and
controls heater operation to bring the water to the
desired temperature. The desired temperature is
set by rotating a knob on the face of the control
panel. To achieve accurate water temperatures,
the pool/spa water must be monitored with an
accurate pool thermometer.
3.
Pilot/Pilot Ignition
- The Legacy heater relies
on a standing pilot to ignite the burners when the
temperature control calls for heat. When lit the
pilot receives a constant flow of gas from the gas
valve. If the pilot extinguishes, the gas valve is
automatically signalled to stop the flow of gas to
the pilot and the burners to prevent a gas build
up in the heater. Igniting the pilot is achieved by
means of a piezo spark igniter mounted on the
inner front panel of the controls compartment of
the heater.
4.
Pilot Generator (Thermopile) -
The pilot gener-
ator is a device, that when heated by the flame
of the pilot, generates a small electrical voltage
of approximately 750 millivolts. The voltage
is placed across the temperature 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. This voltage
is also used to activate the gas valve's pilot coil
which allows gas to flow to the pilot after the gas
valve knob is released.
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.
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
switch to fail. This opens the safety circuit which
shuts off the gas valve and shuts the heater down.
8.
Vent Fusible Link -
This is a single use switch
which detects abnormal temperature in the vent
system. It is mounted to the flue collector assem-
bly. Excessive temperatures will cause the switch
to open. Excessive temperatures can be caused
by inadequate water flow or a damaged heat
exchanger. The vent fusible link 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 check-
ing the pilot generator and control components of the
heater one at a time and in the order they appear in the
control circuit.
Note
Pump must be running during the
troubleshooting procedure.
These procedures require a voltmeter with a
minimum 0-1000 mVDC range. Figure 25 shows
the pilot generator and control circuits, and where
to take measurements. Location numbers and
letters in circles have been added, and will be refer-
enced in the following sections.
As stated at the beginning of this manual, some
of these procedures are hazardous. Only a qualified
service technician should service the heater.
During the trouble shooting procedure, the filter
pump must be on, the pilot on the heater must be lit,
the ON/OFF switch on the heater must be in the ON
position and the control knob must be turned to the
maximum setting so that there is a call for heat. We
recommend turning the gas valve control knob to the
"PILOT" position to prevent the main burners from
firing throughout the procedure. Before starting the
procedure, be sure that the pilot has been lit for at least
2 minutes and that the pilot generator (thermopile) is
positioned correctly within the flame of the pilot.
The pilot generator also operates the pilot coil of
the gas valve, allowing gas to flow to the pilot when
the gas valve knob is released from the pilot light-
ing position, see Section 7.3 "Lighting and Shutdown
Procedures". If the pilot will not stay lit when the gas
valve knob is released, check the pilot generator output
as described in Section 10.4.2 and replace if necessary.
If the pilot generator output is sufficient, then check
the gas valve as outlined in Section 10.4.1.
10.4.1 Gas valve
The gas valve consists of two (2) separate
internal operating valves. The main valve supplies
gas to the main burners for heater operation. The pilot
valve supplies gas to the pilot when the pilot generator
activates the pilot coil.
If the pilot will not stay lit after following the
lighting instructions in Section 7.3, check for the
following:
• Pilot generator output
• Correct type of gas supplied
• Correct gas supply pressure
• Air in the gas line
• Pilot coil wire connections clean and tight
If the pilot will not stay lit after checking the
items listed above, the pilot coil may be causing the
fault. Replace the gas valve.
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