Page 48
LXi
™
Pool/Spa Heater Installation and Operation Manual
10.5.3.7 Gas Valve Voltage
The gas valve will operate only when there is a
call for heat, all safety circuits have been satis
fi
ed, and
the hot surface igniter has had power for appoximately
35 seconds. If the gas valve does not operate under
these conditions, check the voltage going to the gas
valve. Place one voltmeter lead in the two-pin connec-
tor on the controller where the yellow wire is con-
nected (test point 14). Touch the free lead of the meter
to the gas valve terminal where the brown wire is
attached at the gas valve. This test point will have volt-
age present only during a trial for ignition or during
normal operation. The meter should read 20-28 Volts
AC. If there is no voltage, then there is a bad connec-
tion between the gas valve and the ignition control.
Replace the wire harness.
Listen closely to the gas valve when it is
fi
rst
energized (24V
fi
rst appears at test point 13 during
the trial for ignition). There should an audible “click”
when the valve opens.
If there is voltage at the gas valve terminal where
the brown wire is attached, but the gas valve does not
open, replace the valve.
10.5.3.8 Igniter/Ignition Control Circuit
WARNING
The igniter, power supply circuit board and some
terminals of the ignition control utilize 120V or 240V
power and require appropriate servicing precau-
tions. Note that wires and terminals of these compo-
nents may be “hot” even when the component is not
operating.
AVERTISSEMENT
Le dispositif d’allumage, le circuit d’alimentation
électrique et certaines bornes de la commande
d’allumage utilisent une tension de 120 V ou de 240
V et exigent des précautions appropriées lors du
service d’entretien et de réparation. Notez que les
fi
ls et les bornes de ces composants peuvent être
chauds même si le composant ne fonctionne pas.
With the igniter energized, there will be voltage
of 102-132 VAC between the IGN120 and IGNFS
terminals on the ignition control, test point J and test
point K, if the heater is connected to a 120V supply.
If the heater is connected to a 240V supply, then
the voltage reading between these two points will be
102-132 VAC if the transformer is working properly.
This voltage will be applied only during igniter heat up
or trial for ignition. Even if voltage has been con
fi
rmed
at the end of the safety circuit, the “trial for ignition”
sequence is imposed by the ignition control.
This sequence consists of a 15-second period of
pre-purge, a 40-second period for heat-up of the ig-
niter, and a 7-second trial for ignition. During this last
47 seconds there is voltage between test point J and
test point K. If satisfactory ignition is not achieved,
the igniter is turned off and the system waits for a 15
second inter-purge period. The system may go through
this cycle as many as three (3) times, but thereafter it
is “locked out” by the ignition control for a 1 hour pe-
riod. Additional attempts will be made only if the call
for heat is interrupted by turning off electrical power
or setting the control to “Off” and then back to "Pool"
or "Spa" or after the one hour delay.
To trouble shoot the ignition control's igniter
circuit, connect the voltmeter leads at test points J and
K, and set the control to call for heat. Observe that
the normal ignition sequence takes place. After the
15 second pre-purge, note the voltage between test
points J and K. Then look for the glow of the igniter
through the view port on the right side of the combus-
tion chamber. If the correct voltage is detected be-
tween points J and K during the trial for ignition but
the igniter does not glow, check the connections to the
igniter.
Check the igniter with the ohmmeter. Disconnect
the IGN120 and IGNFS terminals from the ignition
control. Place one lead of the meter on each wire to the
igniter. The resistance should read between 40 and 75
Ohms at ambient air temperature.
If the meter reading is outside of this range or
shows an open or short circuit, replace the igniter. If a
short circuit is indicated, it is necessary to investigate
further to
fi
nd if the short is from the igniter or the
fl
ame sense circuit. Remove the air plenum cover and
test the igniter resistance at test points H and I. If a
short is indicated, replace the igniter. If not, look for
the short in the
fl
ame sense circuit. Correct the short
and replace any damaged wiring and the
fl
ame rod if
necessary.
If voltage does not appear between points J and
K during the trial for ignition, there may be a bad con-
nection, faulty transformer, or a short on the ignition
control. Check all connections, the transformer, and
the ignition control for loose or corroded connections
or failure and replace as necessary.
Summary of Contents for LXi
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