WATER PRESSURE SWITCH
Hazardous pressure. Do not bypass the Water Pressure Switch or render it inoperable.
Switch Settings
The water pressure switch turns off the burner if the water flow is interrupted. If the water flow is restricted, the water pressure switch may prevent the burner from firing and cause the “Service System” light to go on. If the light remains on after the filter has been serviced, have a quali- fied service technician check the system.
For
the switch clockwise ( 
) to raise setting (heater below the pool) and counterclockwise ( 
) to lower the setting (heater above the pool - see Figures 18 and 19). Test the switch after resetting.
FIGURE 18: Remove cover for access to Switch
Raise Pressure
Raise pressure set point if pressure switch is more than 2 feet below water level
Lower Pressure | 2734 1296 |
|
Lower pressure
set point if pressure switch is more than 5 feet above water level
Back of pressure switch has a reference scale.
FIGURE 19: Pressure Switch Adjustment
NOTICE: When the heater is mounted more than five feet above or two feet below the deck level, a Pressure Switch is no longer adequate. A Flow Switch must be installed instead.
NOTICE: Heater operation with incorrect Pressure Switch setting may cause operation with no water flow. Operation of the heater without sufficient water flow may severely damage it.
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 pres- sure switch malfunction. Immediately press the OFF but- ton 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.
PRESSURE RELIEF VALVE
A pressure relief valve is not supplied with the heater. Some local codes may require installation of a pressure relief valve. If your local code requires a relief valve, install a 3/4” pressure relief valve complying with the ANSI/ASME Boiler and Pressure Vessel Code, having a capacity equal to the Btu/hr rating of the heater. The relief pressure of the valve MUST NOT EXCEED 50 PSI.
A 3/4” NPT connection is provided in the manifold for installing a pressure relief valve. The relief valve must be installed vertically. To install the valve, use a 3/4” brass nipple and elbow, as illustrated in Figure 20. No valve is allowed to be placed between the manifold adapter and the relief valve.
Relief Valve
User 
supplied 
pipe 
fittings
2681 1096
Pipe relief valve discharge to a drain or other safe disposal site.
FIGURE 20: Relief Valve (Check Local Codes)
18
