STA-RITE 200K BTU/HR Owner's Manual page 17

The flow through the heater can be checked by the follow-
ing procedure.
1. Clean the filter and skimmers.
2. With the heater off, measure the temperature of the
water discharging from the heater.
3. Turn on the heater, wait two minutes, and again mea-
sure the temperature of the water discharging from the
heater.
4. The difference in the temperatures measured at steps 2
and 3 should be within the max/min values listed
below.
Table 9: Maximum and Minimum Temperature
Rise Through Heater
Model Max Temp Rise
200
333
400
If the temperature difference is above the maximum, there
is not enough water flow to the heater. Turn off heater.
Check for obstructions in the filter, skimmers, and plumb-
ing. If the water flow is still inadequate, a larger pump is
required.
If the temperature difference is less than the minimum, the
water flow rate to the heater is above 120 GPM, and must
be reduced by installing a manual bypass valve (Figure 17).
After installing the valve, adjust the valve to bring the tem-
perature difference within the acceptable range. Then
remove the valve handle or lock it in place to prevent tam-
pering.
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.
Table 10: 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
Min Temp Rise
17°F 3°F
18°F 5°F
17°F 6°F
Levels not established. Consult local health department before use.
FIGURE 17: Manual bypass valve
WATER CHEMISTRY
Water chemistry should follow good swimming pool water
chemistry practices. See Table 10 (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.
Minimum
1.0
None
2.0
7.2
60
300 1,000-2,000
150
None
None
None
17
Cool Water In
Warm Water Out
1. Set Manual
Bypass Valve
2. Remove handle
Outlet to
Pool
Ideal Maximum
1.0-3.0
None
2-4
7.4-7.6
80-100
200-400 500-1,000
None
None
None Refer to Local Code
Inlet from
Filter
3.0
0.2
4.0
7.8
180
3,000
None
None