Specifications
3. Start the lter pump and conrm 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. Set the heater control to either "POOL" or "SPA".
Heater should start.
5. With your 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 lter pump
OFF. The burners should shut off immediately. If
they do not, restart the lter 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 re unless the pump is running. If a proper
setting cannot be reached, contact the factory service
department.
7.8 Temperature Rise
NOTE A temperature rise measurement kit is needed
to perform this test. order part number
R0336000.
The Legacy pool and spa heaters have an internal
bypass which accommodates a wide range of water
ow. The bypass is easily adjustable to change the
temperature rise for optimum performance and length of
heater life. The bypass assures constant heat exchanger
ow even though ow through the lter system will
vary depending on how dirty the lter is.
For most installations, an external bypass valve
is not needed in the heater water piping. This is due to
the large size of the heater's internal bypass valve. If
the pump ow rate is known to exceed 125 gpm (7.9
lps), an external bypass may be needed to assure proper
heater operation.
Water ow should be conrmed upon start-up of
the heater and in most servicing situations. If the ow
is not normal, corrections must be made to the pool
system. Flow is evaluated by determining the water
temperature rise through the heat exchanger.
Before checking the temperature rise, make sure
that the pool lter is clean and that gas supply and
manifold pressures are correct. If necessary, clean
all components of the lter system. Temperature rise
is measured in the return header of the Legacy. To
measure the temperature rise, turn off the lter pump
and remove the plastic plug protruding through the
cabinet on the return header side of the heater. See
Figure 23. With the plug removed, install the special
7.7 Adjusting the Water Pressure Switch
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 ow can
damage the appliance. Adjust the switch to turn
the heater off, not on.
CAUTION
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.
ATTENTION
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 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 lter is clean before making
any pressure switch adjustment. A dirty lter will
restrict the water ow and the pressure switch cannot be
adjusted properly.
To adjust the pressure switch, see Figure 22 and
proceed as follows:
1. Set the heater control to the "OFF" mode.
2. Remove the side panel above the front header to
access the water pressure switch.
Figure 22. Adjustment of Pressure Switch
SLOWLY TURN ADJUSTMENT
SPROCKET CLOCKWISE
UNTIL HEATER GOES OFF.
Page 29
ENGLISH
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
|
Installation and Operation Manual