Five Star Sr200na, Sr200lp,, Sr333na, Sr333lp,, Sr400na, Sr400lp Water Pressure Switch

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 deck-level heater installations, the Pressure Switch is factory set at 3 psi. If the pressure switch is one to two feet below or one to five feet above the pool water level, reset the switch so that it is open when the pump is off and closed when the pump is running. Turn the star-wheel on

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