Specifications

thread adapter and Pete’s Plug
®
tting and insert a
pocket thermometer. A temperature rise measurement kit
is available through your Jandy distributor. See Section
11 of this manual for the correct kit number.
The internal bypass can be adjusted by means of a
screw on the right-hand side of the header. To adjust the
temperature rise to within the ranges specied in Table
6, proceed as follows:
1. If the piping system has an external bypass valve,
close it.
2. Set the heater's control panel to the "OFF"
position.
3. Start the lter pump.
4. After three minutes, note and record the thermom-
eter reading. This is the pool water temperature.
5. Start the heater by setting the control panel to
either "POOL" or "SPA". Allow the heater to
operate for ve 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 des-
ignated 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 temperature
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 ow
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 ow, 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
Proper Water Balance is the key to the enjoyment
of your pool or spa experience and to the long life of
your heater.
The pH of your pool or spa’s water is one of the
factors that has the most impact on indicating how
properly balanced the water is. The other factors are:
temperature, total alkalinity, calcium hardness and total
dissolved solids. Cold water is typically more acidic
(corrosive), while hot water that is not properly balanced
could lead to a scale forming (basic) condition. While
the heater is in operation, if the PH is allowed to rise
above 7.8 and the calcium hardness and total alkalinity
are not properly maintained; calcium in the water could
lose solubility, coating the copper tubes inside the heat
exchanger. This will restrict the ow of water resulting
in reduced efciency and possible damage to the heater.
If the pH is allowed to drop below 7.2, and the
alkalinity is not properly maintained, the water will
become more acidic. Acidic water has a tendency to
dissolve metal components in the pool plumbing with
the copper heat exchanger in the heater being a prime
target.
PH, Total Alkalinity (TA), temperature, Calcium
Hardness and Total Dissolved Solids (TDS) play a role
in whether the water is either corrosive or scale forming.
These factors are combined in the Langelier Saturation
Index, which is a method for determining whether or not
water is properly balanced. See table (7)
BYPASS
ADJUSTMENT
SCREW
THERMOMETER WITH
PETE'S PLUG
®
Figure 23. Temperature Rise Measurement
Page 30
ENGLISH
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
|
Installation and Operation Manual