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ENGLISH
Installation and Operation Manual
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Jandy® Legacy™ Model LRZE Pool/Spa Heater by Zodiac®
10.4.3.5 temperature Limit Switches
circuit
Since the limit switches are not easily accessible,
the voltage can be checked at the two legs of the
circuit at the controller. See test points 8 and 9 in
Figure 28.
Check the voltage at test point 8. If there is
not 20-28 Volts AC nominal at this point, either the
controller or the two-pin wire harness is faulty, or one
of the two safeties (water pressure and fuselink) before
it are open. If 20-28 Volts AC nominal is detected at
this point, then move the red lead of the meter to test
point 9 where the black wire from the 130°F (55°C)
limit enters the two-pin connector. If 20-28 Volts AC
nominal is detected at this point, the devices in this
circuit are closed and the circuit is working properly.
If there is no voltage, one of the limit switches
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 flow. Water
flow deficiency may be due to obvious problems
such as a defective pump or blocked water filter.
Alternatively, excessive water temperature may be due
to over-firing, or to a problem with the water piping or
the heater's internal bypass control. Over-firing might
be a result of an incorrect gas orifice 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 (65°C) 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 (55°C) 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 (65°C) 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
(65°C) 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 (55°C) 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 (55°C) 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 satisfied 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 16). 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 first
energized (24V first appears at test point 15 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
fils 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 13 and test point 10, 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
Summary of Contents for LRZ Electronic
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