Page 28
7.5 Adjusting the Water Pressure Switch
CAUTION
The water pressure switch should be adjusted
to turn the heater off when the pump is off.
Setting the switch to close at too low of a flow
can damage the appliance. Adjust the switch to
turn the heater off, not on.
ATTENTION
Le manocontact de pression d’eau doit être
réglé de façon à ce que l’appareil cesse de
fonctionner si la pompe s’arrête. Si le
manocontact est réglé pour se fermer lorsque
le débit d’eau est trop faible, l’appareil risque de
s’endommager. Réglez le manocontact pour
qu’il arrête l’appareil, et non pour qu’il le mette
en marche.
The pressure switch is preset at the factory for
activation at 2 psi (14 kPa). Adjust the pressure switch
only if any part of the filter system piping is 3 feet
(0.91 m) or more above the top of the heater jacket.
Do not adjust the pressure switch if the heater is
installed more than 15 feet (4.57 m) below or 6 feet
(1.83 m) above the pool surface. Consult your local
Jandy representative for recommendations.
On some installations, the piping from the heater
to the pool is very short. The back pressure could be
too low to trigger the pressure switch. If this happens,
it may be necessary to install a directional fitting or
elbows where the return line enters the pool. This will
increase back pressure enough for the heater to
operate properly.
Make sure the pool filter is clean before making
any pressure switch adjustment. A dirty filter will
restrict the water flow and the pressure switch cannot
be adjusted properly.
To adjust the pressure switch, proceed as
follows (see Figure 28).
1. Set the heater control to the "OFF" position.
2. Start the filter pump and confirm by means of a
voltmeter that the pressure switch closes (if the
switch fails to close, replace it with a switch that
has a lower minimum setting).
3. Set the heater control to either 'Pool' or 'Spa'.
Heater should start.
4. Pry out the top rubber dirt plug on the pressure
switch.
5. Use a 7/32 inch Allen wrench to turn the
adjustment screw very slowly clockwise until
the heater goes off.
6. Slowly turn the pressure switch adjustment
screw counterclockwise one-quarter turn. The
heater should come back on.
7. Check the adjustment by turning the filter pump
OFF. The heater fan will continue to run but the
burners should shut off immediately. If they do
not, restart the filter pump and repeat Steps 6
and 7. Check the adjustment again.
8. Return the pool temperature control to the
desired temperature.
It may be necessary to repeat these steps to get
a proper setting. The switch must be set so that the
heater will not fire unless the pump is running. If a
proper setting cannot be reached, contact the factory
service department.
Figure 27. Gas Valve
Figure 28. Adjustment of Pressure Switch
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