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Installation and Operation Manual
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Legacy™ Model LRZM Pool/Spa Heater
Once the pool/spa water temperature reaches the
thermostat setting, the heater will automatically stop
firing. 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 field. If the control is faulty,
shut down the heater by following the procedures in
Section 8.3 and have a qualified service technician
replace the control. DO NOT use the thermostat switch
to completely shut down the heater.
section 9. Maintenance
9.1
Water Chemistry
The mineral content of swimming pool water
increases daily due to natural evaporation and the
addition of sanitizing chemicals. If the mineral concen-
tration in the pool gets too high, the excess miner-
als will deposit on the walls of the pool, in the filter
system, and in the heater tubes.
The proper chemical balance in spa water is
more critical than in a swimming pool heater opera-
tion. Due to the spa's size, high water temperature and
heavy usage, chemical values in a spa can vary greatly.
This chemical imbalance can result in unsanitary water
conditions, and affect the life of the heater.
Proper chemical balances are necessary for
sanitary bathing conditions as well as ensuring your
heater's long life. Kits are available from your local
pool supply dealer for making the various tests for
mineral content. One of these kits will detect copper
in the system. This is usually a warning that corro-
sion is taking place, possibly due to a low pH value
combined with other chemistry problems. The condi-
tion can be corrected by changing the spa water and
closely monitoring the pH factor and chemical proper-
ties of the water. Be sure to keep your chemical levels
within the values indicated in Table 7.
Zodiac does
not warrant heat exchangers damaged by corrosive
chemical levels or excess dissolved solids in pool or
spa water.
For spas, it is also necessary to perform water
changes in addition to chemical treatment. It is recom-
mended to change the spa water every 60 days for light
usage and every 30 days if usage is heavy.
table 7. optimal Water Chemistry ranges*
test
recommended level
Free Chlorine
1.0 to 3.0 ppm
Bromine
2.0 to 4.0 ppm
pH
7.4 to 7.6
Total Alkalinity (TA)
80 to 120 ppm
Calcium Hardness (CH)
175 to 400 ppm
Cyanuric Acid
10 to 50 ppm
Total Dissolved Solids
(TDS)
1000 to 2000 ppm (Excluding dis-
solved NaCl from a Salt Chlorine
Generator)
Copper
0 ppm
* Concentration levels taken from "Basic Pool and Spa
Technology" published by APSP (Association of Pool and Spa
Professionals).
9.2
seasonal Care
Caution
Do not operate this heater outdoors at tempera-
tures below 20 degrees Fahrenheit (°F) (-7 degrees
Celsius [°C]).
9.2.1 spring and Fall operation
During periods when the pool is only going to be
used occasionally, turn the temperature control down
to the MIN setting. This prevents the pool water from
becoming chilled, and minimizes the time required to
raise the pool water back up to the desired tempera-
ture.
In areas subject to only short freeze periods, turn
off the heater and run the pump continuously for the
length of the freeze period.
If the heater is not going to be used for a long
period of time, shut it down completely. Refer to
Figure 19 and follow the instructions found on the
inside of the heater:
9.2.2 Winterizing
In areas where freezing temperatures occur in
winter, and the pool or spa will not be used, have your
service technician perform the following steps:
1. Turn off the main gas supply valve to the heater,
outside the heater jacket.
2. Remove heater door.
3. Shut down the heater following the shutdown
instructions found on the inside of the heater or
Figure 19.
4. Remove the drain plug from the inlet/outlet
header, and completely drain the heater before
the first frost. See Figure 21.
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