Page 42
Jandy
®
JXi
™
Gas-Fired Pool and Spa Heater | Installation & Operation Manual
Section 9. Maintenance
If the heater is not going to be used for an extended
period of time and in colder climates, follow seasonal
shutdown instructions. See Section 8.6 and Figure
21.
IMPORTANT MAINTENANCE NOTE
We recommend that before each pool season, the
Thermal Regulator Valve (TRV) be inspected for
proper operation and replaced if there are signs of
scaling or corrosion.
Corrosion and scaling are the result of improperly
balanced water please see Section 9.1.1 for
complete details on managing your water chemistry.
The TRV ensures the heater operates at it’s optimal
efficiency and if properly maintained will extend the
life of the heater.
WARNING
Do not operate the heater if the water temperature is below 40 °F
(4°C)
• Short term operation of heater when temps are below 40F can continue but
continuous flow must be maintained.
• Prolonged operation with water below 50F can seriously damage the heater and
is not covered by warranty.
9.1 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 tends to 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 flow of water
resulting in reduced efficiency 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
such as copper tubing in the heat exchanger.
Recommended Levels Fiberglass Pools Fiberglass Spas Other Pool and Spa Types
Water Temperature 66-88 °F (20-31 °C) 89-104 °F (31-40 °C) 68-104 °F (20-40 °C)
pH 7.3 - 7.4 7.3 - 7.4 7.6 - 7.8
Total Alkalinity (ppm) 120 - 150 120 - 150 80 - 120
Calcium Hardness (ppm) 200 - 300 150 - 200 200 - 400
Salt (ppm) 4500 Maximum 4500 Maximum 4500 Maximum
Free Chlorine (ppm)* 2 - 3 2 - 3 2 - 3
Total Dissolved Solids (ppm) 3000 Maximum** 3000 Maximum** 3000 Maximum**
*Free Chlorine MUST NOT EXCEED 5 ppm!.
**In saltwater chlorinated pools, the total TDS can be as high as 6000 ppm.
Table 7. Pool Water Chemistry
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