STA-RITE SR333LP - Manual (Page 17)

17
WATER FLOW RATE
Maximum and minimum water flow rates required by the
heater are listed below:
If the water flow rate to the heater is above 120 GPM (454
LPM), it must be reduced by installing a manual bypass valve
(Figure 17). After installing the valve, adjust the valve to bring
the flow rate within the acceptable range. Then remove the
valve handle or lock it in place to prevent tampering.
Occasionally a two-speed pump will not develop enough
pressure on the low speed to operate the heater. In this
case, run the pump at high speed only to operate the
heater. If this does not solve the problem, do not try to run
the heater. Instead, correct the installation.
Do not operate the heater while an automatic pool cleaner
is also operating. If the circulation pump suction is plugged
(for example by leaves), there may not be adequate flow to
the heater. Do not rely on the pressure switch in this case.
WATER CHEMISTRY
Water chemistry should follow good swimming pool water
chemistry practices. See Table 9 (below) for water chem-
istry parameters.
When using a chlorinator, install it downstream from the
heater and at a lower level than the heater outlet. Install a
corrosion resistant positive seal check valve (see Figure 15)
between the heater and the chlorinator to prevent concen-
trated chemicals from back-siphoning into the heater.
Back-siphoning is most likely to occur when the pump
stops, creating a pressure-suction differential.
Do NOT sanitize the pool by putting chlorine tablets or
sticks into the skimmer(s). When the pump is off, this will
cause a high concentration of chlorine to enter the heater,
which could cause corrosion damage to the heat exchanger.
Model Minimum Flow Maximum Flow
200 20 (76) 120 (454)
333 33 (125) 120 (454)
400 40 (152) 120 (454)
Table 9: Water Chemistry Parameters
Disinfectant levels Minimum Ideal Maximum
Free Chlorine, ppm 1.0 2.0-4.0 10.0
Combined Chlorine, ppm None None 0.2
Bromine, ppm 2.0 4-6 10.0
Other Sanitizers Levels not established. Consult local health department before use.
Chemical Values
pH
7.2 7.4-7.6 7.8
Total Alklinity (Buffering), ppm 60 80-100 180
as CaCO3
Total Dissolved Solids, ppm N/A N/A 1,500 ppm > TDS at startup*
Calcium Hardness, ppm, as CaCO3 150 200-400 500-1,000
Heavy Metals None None None
Biological Values
Algae
None None None
Bacteria None None Refer to Local Code
1. Set Manual
Bypass Valve
2. Remove handle
Cool Water In
Warm Water Out
2680 1096
Inlet from
Filter
Outlet to
Pool
NOTICE: Failure to adhere to the listed water chemistry parameters may result in premature failure of the heat exchanger
and will void the warranty.
*Start-up TDS includes source water TDS and any other inorganic salt added at start-up.
Table 8: Maximum and Minimum
Flow Rate in GPM (LPM)
FIGURE 17: Manual bypass valve