Adjusting The Water Pressure Switch - Jandy Legacy LRZM Installation And Operation Manual

Page 26
Legacy
CAUTION
In order to prevent property damage, the heater is
designed to run only when the fi lter pump is run-
ning. If the heater does not immediately turn off
when the pump turns off, turn the heater off at the
control panel. The heater's pressure switch may
need adjusting (see Section 7.5)
ATTENTION
Pour éviter les dommages à la propriété, le réchauf-
feur est conçu pour fonctionner seulement lorsque
la pompe à fi ltration est en marche. Si le réchauf-
feur ne s'éteint pas immédiatement lorsque vous
arrêtez la pompe, éteignez le réchauffeur sur le
panneau de commandes. Le commutateur de pres-
sion du réchauffeur devra peut-être être ajusté (voir
la Section 7.5).
Once the pool/spa water temperature reaches the
thermostat setting, the heater will automatically stop
fi ring. As the pool/spa water temperature falls below
the thermostat setting the heater will once again start
the heating cycle.
Rotate the thermostat dial clockwise to increase
the temperature setting and counterclockwise to
decrease the setting. It may take several attempts to
set the thermostat dial to the desired temperature. Be
sure to use an accurate thermometer to measure water
temperature. Once the desired temperature setting is
found, loosen the screw on the Temp-Lok ring and
rotate the ring until the stop rests against the knob.
Tighten the screw to hold the knob in position. This
will prevent accidental moving of the dial and possible
overheating of the water.
IMPORTANT: The temperature controls cannot
be calibrated in the fi eld. If the control is faulty,
shut down the heater by following the procedures in
Section 7.3 and have a qualifi ed service technician
replace the control. DO NOT use the thermostat switch
to completely shut down the heater.
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 fl ow 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 mano-
contact pour qu'il arrête l'appareil, et non pour qu'il
le mette en marche.
Model LRZM Pool/Spa Heater Installation and Operation Manual
™
SLOWLY TURN ADJUSTMENT
SPROCKET CLOCKWISE
UNTIL HEATER GOES OFF.
Figure 19. Pressure Switch Adjustment
The pressure switch is preset at the factory for
activation at 2 psi (14 kPa). Do not adjust the pressure
switch if the heater is installed more than 15 feet (4.57
m) below 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 fi tting 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 fi lter is clean before making
any pressure switch adjustment. A dirty fi lter will
restrict the water fl ow and the pressure switch cannot
be adjusted properly.
To adjust the pressure switch, proceed as follows
(see Figure 19).
1. Turn the heater control to OFF. See Figure 17.
2. Remove the side panel above the front header to
access the water pressure switch.
3. Start the fi lter pump and confi rm 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).
4. Turn the heater ON. Set the temperature control
to the max position. Heater should start.
5. With your fi ngers, turn the adjustment sprocket
very slowly clockwise until the heater goes off.
6. Slowly turn the pressure switch adjustment
sprocket counterclockwise one-quarter turn. The
heater should come back on.
7. Check the adjustment by turning the fi lter pump
OFF. The burners should shut off immediately.
If they do not, restart the fi lter pump and repeat
Steps 6 and 7. Check the adjustment again.