Page 7
Jandy
®
JXi
™
Gas-Fired Pool and Spa Heater | Installation & Operation Manual
1.8 Heater Components
Front
Rear
Header
a
Monitors temperature at the exhaust flue. If
excessive temperatures are detected,
combustion will stop and a fault will be displayed.
Flue Temperature Sensor
a
Indicates a safety control equipped to protect internal
components and extend the life of the heater.
b
c
dd
e
f
g
h
i
Controls gas flow into the burner. Enables flow when the
temperature control calls for heat and all safety controls
enable operation. It also regulates gas pressure to -0.2” WC (Water Column)
below the air pressure at the blower inlet. Necessary pressure regulation
cannot be accomplished with common (positive pressure) gas valves.
Gas Valve
g
When current is passed through the ceramic
material of the igniter it will achieve temperatures
great enough to initiate combustion of the air/fuel mixture.
Hot Surface Igniter
b
Provides energy for ignition, monitors flame quality
and controls the gas valve. Upon call for heat, the
blower is activated to purge the combustion chamber. Electrical power is
then applied to the hot surface igniter. When ignition temperature is
attained, the gas valve opens and ignition occurs. If stable flame is detected
the igniter will power down. If stable flame is not detected the control
system will close the valve to prevent further gas release. If a total of 3
ignition attempts fail an ignition fault is displayed.
Ignition Control
c
Prevent water of excessive temperatures from
being discharged from the heater. If either switch,
one at the heat exchanger first pass 135°F (57°C) and one at the heat
exchanger outlet 150°F (65°C), senses excessive temperature, the gas
valve will close and combustion will stop.
High Limit Switches
d
Senses water temperature by
means of a thermistor. Heater
will operate to attain and maintain the water temperature according to the
heater settings. Two separate thermostat settings are supported, typically
used to set pool and spa temperatures.
Pool/Spa Water Temperature Control
e
Senses whether or not water is available to
the heater by measuring back pressure at the
header inlet. If insufficient pressure is detected, the display will indicate a
“Check Flow” fault and combustion will stop.
Water Pressure Switch
f
Draws in air and fuel gas
creating an air/fuel mixture that
is passed through the burner for combustion. The fan will operate for
several seconds before flame initiation and after the flame is extinguished
to purge the combustion chamber for a clean burn and to expel any
residual exhaust gas.
Combustion Blower and Air Orice
h
Monitors the vacuum (negative pressure) within
the blower housing. This switch verifies that air is
flowing through the combustion system by sensing pressure. If air flow is
inadequate, combustion will stop and a fault will be displayed.
Air Pressure Switch
i
To Next Page
Loading...
Need help?
General
