Model LC (Australia) Pool and Spa Heater
Page 19
Electrical Connections.
Make sure all of the wire
connections on the ignition control and the gas valve
are tight. Make sure the wiring agrees with Figure 5.
If sparking occurs at the ignitor electrode, but
there is no pilot ignition after two or three minutes,
check for voltage between the blue wire connector at
the 24V terminal on ignition control and the PV
terminal on the ignition control (see Fig. 29). If the
voltmeter does not show voltage, replace the ignition
control. If the meter registers between 20-28V but
there is no pilot ignition, check for a dirty pilot before
replacing the gas valve.
B. Pilot Burner Lights, But There is no Main
Burner Ignition
When the pilot burner lights, the sparking should
stop and the main burners should fire. If the sparking
continues and the main burners do not fire, check all of
the wire connections, ignition cable and use a mirror to
make sure there is pilot flame. If everything appears
okay, measure the flame sensing current by connecting
a direct current (DC) microammeter between a yellow
ground wire and the "GND (BURNER)" terminal on
the ignition control (see Fig. 30).
NOTE:
The meter leads must be separated from each
other and clear of the heater chassis for most of their
length to properly perform this test.
If the pilot flame and sensor electrode are all
right, but there is no main burner ignition, check for
voltage between the blue wire on the transformer (to
24V on the ignition control) and the brown wire on the
gas valve with the voltmeter (see Fig. 31). If the meter
registers between 20 to 28V, but the main burners do
not fire, replace the gas valve.
C. On-Off Main Burner Cycling
Poor wind conditions on an outdoor installation,
pilot components out of position, or low gas pressure
can cause improper pilot flame. This can result in the
main burners cycling on and off.
The pilot flame may appear to be okay until the
main burners come on, then the pilot flame shrinks.
This could be caused by an undersized gas supply line.
See Table 3 for proper gas supply piping size.
Figure 30. Flame Sensing Current Check
Figure 29. Testing the Ignition Control
When the pilot lights, the meter should indicate
current of 1.5 microamperes or more with or without
the main burners firing. Poor pilot flame, the position
of the pilot electrode or bad cable and connectors
could cause a smaller current.
D. Heater Will Not Shut Off
If the heater stays on with the brown wire on the
gas valve disconnected (see Fig. 31), replace the gas
valve. See Section 4D for replacement instructions.
IMPORTANT: Disassembly of the gas valve will
void the manufacturer's warranty.
If the gas valve is all right, disconnect one of the
lead wires at the pressure switch. If the heater goes off,
turn off the filter pump and reconnect the pressure
