Heater Components - Jandy 200 Installation And Operation Manual

Page 6
ENGLISH
Inlet Gas Supply Pressure
• Natural Gas:
Minimum 4.0" WC
Maximum 10.5" WC
• Liquid Propane:
Minimum 4.0" WC
Maximum 14.0" WC
Gas Valve Offset Pressure
• Natural Gas: - 0.2" WC (when heater is running)
• Liquid Propane: - 0.2" WC
*NOTE: All readings must be taken while the heater is
operating.
Water Pipe/Heater Connection
• 2" unthreaded slip PVC or CPVC pipe
• Jandy Pro Series union
Water Flow Rate
• Minimum: 30 gpm (76 lpm)
• Maximum: 120 gpm (454 lpm)
Working Water Pressure
• Maximum: 50 psi
• Minimum: 2 psi
Exhaust Vent Connection Size (Category I)
Use type B double-wall gas vent, per table 13.1(a) NFPA 54
• Model 200: 6 "
• Model 260: 7 "
• Model 330: 8 "
• Model 400: 8 "
Exhaust Vent Connection Size (Category III)
See Section 3.0 for information.
Electrical Supply
• 120 VAC
• 240 VAC (factory setting)
High Altitude
• Appliances are normally de-rated when installed at high
elevation. This is not necessary with the JXi heater
because it has a special venturi-type combustion system
which self-compensates for changes in barometric
pressure. Air flow through the blower inlet pulls the
correct flow of gas into the burner regardless of air
density. Proper combustion and high efficiency are
assured without special adjustment or changes to the
heater.
Jandy Pro Series, JXi Gas-Fired Pool & Spa Heater
® ™
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Installation & Operation Manual

Heater Components

Gas Valve - The gas valve controls gas flow
into the burner. It enables flow only when the
temperature control requires heat and only if
all safety controls enable operation. It is also a
negative pressure regulator, where it maintains a
gas pressure of 0.2" WC below the the air pressure
at the blower inlet. It regulates the gas pressure to
0.2" WC less than the air pressure at the blower
inlet. This is necessary for proper operation of the
burner system and cannot be accomplished with
common (positive pressure) gas valves.
Combustion Blower and Air Orifice – The
blower pulls air and fuel gas in through their
respective orifices and mixes the two gases before
forcing the fuel/air mixture through the burner
for combustion. During normal operation the fan
will turn on before flame initiation to ensure that
the combustion chamber is clear before the igniter
is energized. Additionally, the fan will run after
the flame is extinguished in order to clear the
combustion chamber of exhaust gas.
Pool/Spa Water Temperature Control - The
JXi heater models are equipped with an electronic
control, which senses water temperature by means
of a thermistor and controls heater operation to
attain and maintain the water according to the
temperature selected. It has an option for two (2)
separate thermostat settings, which are typically
used to set pool and spa temperatures.
Ignition Control - The ignition control provides
energy for ignition of the air/gas mixture, monitors
the flame and controls the gas valve. When the
temperature control calls for heat, the ignition
control provides a pre-purge of the combustion
chamber. Once the pre-purge is complete the
ignition control then applies electrical power to
a hot surface igniter. When the igniter attains
sufficient temperature, the ignition control opens
the gas valve. Immediately after ignition, the
control system will look for characteristics of a
stable flame and de-energize the igniter. If flame
is not detected shortly after opening the gas valve
the control system will close the valve to prevent
further gas release. The ignition control will
attempt to start 2 more times before an ignition
fault is displayed.
Igniter - The hot-surface igniter is constructed of
a ceramic material that attains a temperature great
enough to ignite the air/fuel mixture, when an
electric current is applied.