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ENGLISH
Jandy
®
LXi
™
Model Pool and Spa Heater by Zodiac
®
|
Installation and Operation Manual
This can be done by measuring the voltage between
the wires of the three-pin connector on the power
supply circuit board. These points are designated as
test points D, E, and F on Figure 39. The voltages
measured between any two (2) of these three (3) points
will be determined by the voltage supplied to the trans-
former. See Table 14 for expected voltages.
If the voltages measured do not fall within the
limits shown in Table 14, then there is a problem with
the power supply circuit board and the board must be
replaced.
Table 13. Supply Voltage Measurements
MEASURE
BETWEEN THESE
POINTS
EXPECTED
VOLTAGE WITH
240V SUPPLY
EXPECTED
VOLTAGE WITH
120V SUPPLY
A and B
102 - 132 Volts
0
A and C
102 - 132 Volts
102 - 132 Volts
B and C
204 - 264 Volts
102 - 132 Volts
1. Point A is the ground connection on the heater.
2. Point B is the location at which the red power
lead enters the power circuit board.
3. Point C is the location at which the black power
lead enters the power circuit board.
Table 14. Voltage Supplied To Transformer
MEASURE
BETWEEN THESE
POINTS
EXPECTED
VOLTAGE WITH
240V SUPPLY
EXPECTED
VOLTAGE WITH
120V SUPPLY
D and E
102 - 132 Volts
102 - 132 Volts
D and F
204 - 164 Volts
N/A
E and F
102 - 132 Volts
0
1. Point D is the location at which the white wire
enters the 3 pin connector.
2. Point E is the location at which the black wire
enters the 3 pin connector.
3. Point F is the location at which the blue wire en-
ters the 3 pin connector.
10.5.2 Controller
The controller must be operational in order to
check the control circuits of the heater.
10.5.3 Control Circuit Troubleshooting
The heater controls are arranged in several 24V
60Hz circuits with some operating and safety controls
arranged in series circuits.
Troubleshooting is done by probing for voltage
between the common and various points in the circuit
to determine which component is preventing opera-
tion. Check points are indicated on Figure 39. The
black lead of the meter should be attached to the com-
mon tap on the secondary side of the transformer and
may be left there throughout most of the procedure.
The recommended procedure steps through each
circuit in a sequential way, and each section assumes
that components from all previous sections have been
tested and are operational. However, verifying voltage
at any of the numbered points in that circuit confirms
that all prior components of the circuit are operational.
10.5.3.1 Transformer
Set the voltmeter to measure AC voltage. Attach
the black lead of the voltmeter to the terminal on the
secondary side of the transformer with a yellow wire
attached to it (common). This is test point 1 on
Figure 37. Touch the free lead of the voltmeter to the
terminal on the secondary side of the transformer with
a red wire attached to it (24V tap), test point 2. The
voltmeter should read between 20-28 Volts AC.
10.5.3.2 Fuse
Leave the black voltmeter lead in place at test
point 1. Touch the free lead of the voltmeter to test
point 3, which is on the Power Interface Board where
the red wire from the transformer enters the end of the
connector. You will need to push the voltmeter lead
into the back of the connector along side of the wire
pin. The meter should read 20-28 Volts AC.
If there is no voltage, the fuse has failed. Inspect
the rest of the wiring, especially the safety circuit, to
be sure that there is no “short” such as contact of a
terminal with the heater chassis or another terminal
which may have caused the fuse to fail.
Correct any such condition and replace the fuse.
Use only a 2 amp, 1
¼
inch long x ¼ inch diameter,
fast-acting, glass-tube type fuse.
10.5.3.3 Water Pressure Switch
Start by checking the voltage at the two (2) legs
of this circuit on the controller, see test points 4 and 5
in Figure 37. Check the voltage at test point 4, where
the violet wire from the pressure switch enters the two-
pin connector on the controller.
If there is not 20-28 Volts AC nominal at this
point, either the controller or the two-pin wire harness
is faulty and must be replaced.
If 20-28 Volts AC nominal is detected at test
point 4, then move the red lead of the meter to test
point 5 where the gray wire from the Pressure Switch
enters the two-pin connector. If 20-28 Volts AC nomi-
nal is detected at this point, the devices in this circuit
are closed and the circuit is working properly.
If there is no voltage the pressure switch contacts
are open. This is almost always due to a water flow
deficiency, the most common one being a blocked
water filter or defective pump. However, sometimes
it is due to blockage of the copper siphon loop tube or
mis-adjustment of the switch.
Investigate thoroughly, referring to
Section 7.7,
Adjustment of Pressure Switch
. If there is no problem
with the pool system or pressure switch adjustment,
replace the pressure switch.
