Jandy -Low NOx Installation And Operation Manual - page 44
Page 42
not 20-28 Volts at this point, either the controller or the
ten-pin wire harness is faulty and must be replaced. If
20-28 Volts is detected at this point, then move the red
lead of the meter to test point 24 where the black wire
with a yellow trace from the blower pressure switch
enters the ten-pin connector. If 20-28 Volts is detected
at this point, the device in this circuit is closed and the
circuit is working properly.
If there is no voltage, the pressure switch
contacts are open. Leave one lead of the meter at test
point 1. Move the other lead of the meter to the
contact on the blower pressure switch (test point 25)
where the purple wire is connected. Voltage to this
point means that the wire harness between the control-
ler and the blower pressure switch is good. If there is
no voltage at test point 25, look for a loose connection
or replace the ten-pin wire harness. If there is voltage
at test point 25 then move the lead to the contact on
the other side of the blower pressure switch (test point
26). No voltage here means that the pressure switch
contacts are open. This is usually due to a blower
speed problem or a problem with the air pressure tube
connection between the blower housing and the
switch.
Be sure that the blower is on and that it is
working properly. Check that the gray flexible tube
between the blower pressure switch and the blower
housing is connected at both ends and has no holes or
splits. Replace the tube if necessary. If there is no
problem with the blower or the tube, replace the
pressure switch.
If test point 26 shows 20-28 Volts, then there is a
bad connection between the blower pressure switch
and the controller. Replace the ten-pin connector wire
harness.
10.5.3.7 Gas Valve Voltage
The gas valve will operate only when there is a
call for heat and all safety circuits have been satisfied.
If the gas valve does not operate under these condi-
tions, check the voltage going to the gas valve. Place
one voltmeter lead in the four-pin connector on the
back of the controller where the yellow wire is con-
nected (test point 27). Touch the free lead of the
meter to the gas valve terminal where the brown wire
is attached at the gas valve (test point 28). This test
point will have voltage present only during a trial for
ignition or during normal operation. The meter should
read 20-28 Volts. If there is no voltage, then there is a
bad connection between the gas valve and the control-
ler. Replace the four-pin connector wire harness.
Listen closely to the gas valve when it is first
energized (24V first appears at test point 28 during the
trial for ignition). There should an audible "click" when
the valve opens.
If there is voltage at test point 28, 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
115V or 230V power and require appropriate
servicing precautions. Note that wires and
terminals of these components 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
220 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 leads connected to the power
supply board there will be voltage of 98-126 VAC
between the quick disconnects at the ends of the
igniter wires, test point H and test point I, if the heater
is connected to a 115V supply. If the heater is con-
nected to a 230V supply then the voltage reading
between these two points will be 98-126 VAC if read
with an RMS meter, or 50-65 VAC if read with a non
RMS meter. This voltage will be applied only when
there is an attempt to ignite the burner or when the
ignition control’s flame sensing system has determined
that it is OK to allow burner operation. Even if voltage
has been confirmed 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 H 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. Additional at-
tempts will be made only if the call for heat is inter-
rupted by turning off electrical power or setting the
control to “Off” and then back to "Pool" or "Spa".
To trouble shoot the ignition control's igniter
circuit, connect the voltmeter leads at test points H
and I, 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
H and I. Then look for the glow of the igniter through
the view port on the front of the combustion chamber.
If the correct voltage is detected between points H
and I during the trial for ignition but the igniter does not
glow, check the connections to the igniter.