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17
Verify proper operation of the water pressure switch at
the start of every season and every six months thereafter
by the following steps:
1. Lower the thermostat setting to turn off the heater.
2. Wait at least 15 minutes after the burner is off, and
then turn off the filter pump.
3. Turn up the thermostat as though to fire the burner.
4. Wait one minute. The “Service System” light should go
on but the burner should not fire and the blower
should not start. If the blower or burner do start, or if
the “Service System” light does not go on, there is a
pressure switch malfunction. Immediately press the
OFF button on the operating control to turn the burner
off and call a qualified service technician to check the
system.
Live steam hazard. If the Burner and the
Pump stop at the same time, wait at least 15 minutes
before starting the filter pump to avoid severe damage to
the heater.
CAUTION
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 CaCO
3
Total Dissolved Solids, ppm N/A N/A 1,500 ppm > TDS at startup*
Calcium Hardness, ppm, as CaCO
3
150 200-400 500-1,000
Heavy Metals None None None
Biological Values
Algae None None None
Bacteria None None Refer to Local Code
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.
FIGURE 16: Manual bypass valve
FIGURE 17: Remove side panel for access to Water
Pressure Switch