10.4.3.6 Gas Valve Voltage; 10.4.3.7 Igniter/Ignition Control Circuit - Jandy LRZ Electronic Installation And Operation Manual

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Legacy™ Model LRZE Pool/Spa Heater Installation and Operation Manual
is open. This is normally due to excessive water
temperature, which should be thoroughly investigated
before replacement of limit switches. Excessive water
temperature may be caused by low water À ow. Water
À ow de¿ ciency may be due to obvious problems
such as a defective pump or blocked water ¿ lter.
Alternatively, excessive water temperature may be due
to over-¿ ring, or to a problem with the water piping or
the heater's internal bypass control. Over-¿ ring might
be a result of an incorrect gas ori¿ ce or supply of
propane gas to a heater intended for natural gas.
If there are no such fundamental problems,
identify which of the switches is open. Limit switch
access is through the limit switch plugs on the side of
the heater to which water pipes are connected. Remove
the limit switch plugs from the bottom of the header
and gently remove the switches from the wells.
Note that the limit switches have different
trip points, and it is important that replacements are
correct. The 150°F switch has a red dot on the top of
the switch, and is closest to the heater jacket, must be
installed in the lower well in the header. The 130°F
switch has no dot, and is farthest from the heater
jacket. must be installed in the upper well in the outlet
of the header.
Move the red meter lead to the terminal
connection on the 150°F switch that is connected back
to the controller. The voltmeter should read 20-28
Volts AC nominal. No voltage here means that the
two-pin wire harness is bad and should be replaced. If
voltage is detected at this point move the lead to the
other terminal of the switch. If the voltmeter does not
show voltage then the 150°F limit is bad and should be
replaced. If the meter reads 20-28 Volts AC nominal,
move the lead to the terminal of the 130°F limit that
is connected to the wire that jumps between the two
limit switches. No voltage here means that the wire
assembly is bad and needs to be replaced. 20-28 Volts
AC nominal shows that the wire between the two
limits is making a good connection. Now move the
lead to the other connection terminal on the 130°F
limit. No voltage at this point indicates that the limit
switch has failed and needs to be replaced. Voltage
here would show that the limit is good and that the
two-pin wire harness may have a bad connection.
Replace the wire harness if necessary.

10.4.3.6 Gas Valve Voltage

The gas valve will operate only when there is a
call for heat, all safety circuits have been satis¿ 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 on the connector on
the ignition control where the yellow wire is connected
(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 voltage 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 connection
between the gas valve and the ignition control.
Replace the wire harness.
Listen closely to the gas valve when it is ¿ rst
energized (24V ¿ 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.

10.4.3.7 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
¿ 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 supplied by the ignition control, test
point J and test point I, if the heater is connected to
a 120V supply. If the heater is connected to a 240V
supply, there will be voltage of 102-132 VAC supplied
by the ignition control, test point L and test point I,
with the igniter energized. This voltage will be applied
only during igniter heat up or trial for ignition. Even
if voltage has been con¿ 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 igniter and a 7 second trial for ignition.
During this last 47 seconds there is voltage between
test point J and test point I, or between test point L
and test point I. 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 times, but thereafter it is
"locked out" by the ignition control for a one hour
period. 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,
observe that the normal ignition sequence takes
place. After the 15 second pre-purge, note the voltage