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ENGLISH
Jandy® Legacy™ Model LRZE Pool/Spa Heater by Zodiac®
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Installation and Operation Manual
2. Set the heater's control panel to the "OFF"
position.
3. Start the filter pump.
4. After three minutes, note and record the ther-
mometer reading. This is the pool water tempera-
ture.
5. Start the heater by setting the control panel to
either "POOL" or "SPA". Allow the heater to
operate for five minutes or more. Note and record
the thermometer reading. Subtract pool water
temperature from this reading. This difference
is the temperature rise. Refer to Table 6. If your
measured temperature rise is within the range
designated for your heater, skip steps 6 through
8.
6. Locate the bypass adjustment screw on the right-
hand side of the header, see Figure 23. Loosen
the nut so that the screw can be adjusted. A slight
water leak past the nut may be expected. Turn the
screw counterclockwise to decrease the tempera-
ture rise, and clockwise to increase the tempera-
ture rise as needed to achieve the ranges in Table
6. After the adjustment, tighten the nut so that no
leaks occur.
7. If the temperature rise is too low and cannot
be raised by means of the adjustment screw,
the flow is in excess of 125 GPM (7.9 lps). An
external bypass will need to be installed, or if one
already exists, open the external bypass valve
gradually until the temperature range in Table 6
is achieved.
8. If it was necessary to adjust the external bypass
as outlined in step 6, scribe a line on the bypass
shaft and case to mark the correct adjustment
position. Wire or remove the valve handle to
prevent tampering.
table 6. Water temperature Rise and Flow Rates
(Measured at Return Header)
Model
Minimum
Temp Rise,
°F (°C)
Maximum
Temp Rise,
°F (°C)
Minimum
System Flow
GPM (lps)
125
7 (4)
10 (5)
30 (1.9)
175
10 (6)
13 (7)
30 (1.9)
250
16 (9)
20 (11)
30 (1.9)
325
20 (11)
26 (14)
30 (1.9)
400
23 (13)
29 (16)
30 (1.9)
In a system without external bypass, it may be
necessary to make changes. If temperature rise is too
low, a manual bypass must be installed. If temperature
rise is too high, there is inadequate flow, possibly
requiring a change to the piping system or a larger
pump. Before proceeding with either remedy, verify
proper heater operation. Low gas input results in low
temperature rise and vice-versa. A problem with the
heater internal bypass assembly also affects measured
temperature rise.
Section 8. Maintenance
8.1
Water chemistry
The mineral content of swimming pool water
increases daily due to natural evaporation and the
addition of sanitizing chemicals. If the mineral
concentration in the pool gets too high, the excess
minerals 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 operation. 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 corrosion is
taking place, possibly due to a low pH value combined
with other chemistry problems. The condition can
be corrected by changing the spa water and closely
monitoring the pH factor and chemical properties of
the water. Be sure to keep your chemical levels within
the values indicated in Table 7.
Zodiac Pool Systems,
Inc. 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
recommended 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
50 to 75 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).
Summary of Contents for LRZ Electronic
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