STA-RITE Sr200na, Sr200lp,, Sr333na, Sr333lp,, Sr400na, Sr400lp Owner's Manual page 17

WATER FLOW RATE
Maximum and minimum water flow rates required by the
heater are listed below:
Table 8: Maximum and Minimum
Flow Rate in GPM
Model Minimum Flow
200
333
400
If the water flow rate to the heater is above 120 GPM, 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.
Table 9: Water Chemistry Parameters
Disinfectant levels
Free Chlorine, ppm
Combined Chlorine, ppm
Bromine, ppm
Other Sanitizers
Chemical Values
pH
Total Alklinity (Buffering), ppm
as CaCO 3
Total Dissolved Solids, ppm
Calcium Hardness, ppm, as CaCO 3
Heavy Metals
Biological Values
Algae
Bacteria
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.
Maximum Flow
20 120
33 120
40 120
Minimum
1.0
None
2.0
Levels not established. Consult local health department before use.
7.2
60
N/A
150
None
None
None
Warm Water Out
2680 1096
1. Set Manual
2. Remove handle
FIGURE 17: Manual bypass valve
Ideal
2.0-4.0
None
4-6
7.4-7.6
80-100
N/A
200-400
None
None
None
17
Cool Water In
Bypass Valve
Outlet to
Pool
Maximum
10.0
0.2
10.0
7.8
180
1,500 ppm > TDS at startup*
500-1,000
None
None
Refer to Local Code
Inlet from
Filter