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Installation and Operation Manual
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Legacy™ Model LRZM Pool/Spa Heater
Slowly turn adjustment
sprocket clockwise
until heater goes off.
Figure 26. pressure switch adjustment
BYPASS
ADJUSTMENT
SCREW
THERMOMETER WITH
PETE'S PLUG
Figure 27. temperature rise Measurement
A reading of less than 220mV here indicates a
faulty switch. If the reading is more than 500mV, turn
the switch "OFF" and then "ON" again to be sure that
the internal contacts are working correctly. The volt
meter reading should drop to zero when the switch is
"OFF" and return to at least 220mV when the switch is
placed back in the "ON" position.
11.5 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.
The pressure switch is preset at the factory for
activation at 14 kPa. Do not adjust the pressure switch
if the heater is installed more than 4.57 m below the
pool surface. Consult your local Zodiac 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, refer to Figure 26
and proceed as follows:
1. Turn the heater control to OFF. See Figure 20.
2. Remove the side panel above the front header to
access the water pressure switch.
3. 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).
4. Set the temperature control to the max position.
Heater should start.
5. With your fingers, 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 filter pump
OFF. The burners should shut off immediately.
If they do not, restart the filter pump and repeat
Steps 5 and 6. 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.
11.6 temperature rise
The Legacy pool and spa heaters have an inter-
nal bypass which accommodates a wide range of
water flow. The bypass is easily adjustable to change
the temperature rise for optimum performance and
length of heater life. The bypass assures constant heat
exchanger flow even though flow through the filter
system will vary depending on how dirty the filter is.
Summary of Contents for Legacy LRZ
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