Sterlco SEU Series Economical Water TCU - Manual (Page 37)

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WTR1-605 Chapter 6: Maintenance
Figure 6: Pressure Switch - Side View and Top View
Under the plug is a Phillips-head adjusting screw:
n Turn the screw counterclockwise to reduce the pressure.
- or -
n Turn the screw clockwise to increase the pressure.
A quarter turn (90º rotation) approximates 15 psi (103.4 kPa/ 1.0
bars).
n Replace the plug on the top of the switch.
If the plug gets damaged, the switch is still sealed internally.
Make sure that the high limit on the controller is set to the values listed in the following table,
based on the switch adjustment. This prevents the pump from cavitating and damaging the
seal, the switch, and heater element(s).
psig kPa Max. temp. ºF Max. temp. ºC
5 psig 34.4 kPa 227ºF 108ºC
10 psig 68.9 kPa 240ºF 116ºC
15 psig 103.4 kPa 250ºF 121ºC
Safety Thermostat
Disconnect main power. Open the electrical enclosure and disconnect the neutral lead on the
safety thermostat from the terminal strip. Protect the stripped lead to prevent short circuits.
Close the enclosure, reconnect main power, and push the START button and press ON/OFF
switch to the ON position. The heater should not turn on and the Over Temperature
indicator should illuminate. Disconnect main power before reconnecting the thermostat
lead.
Phillips head screw