Pressure Relief Valve
Protection against over-heating/ excessive pressure:
When the system pressure reaches a maximum of 30 psi (2 bar), the
Pressure Relief Valve opens and the heating water is released in the form
of steam.
Overheat Thermostat (Safety Temperature Limit Switch-STL)
The Overheat Thermostat stops combustion at a boiler temperature of
220 °F (105 °C). The circulators continue to run!
In case Overheat Thermostat automatically has been activated:
Wait for boiler temperature to drop below 203 °F (95 °C)
Remove cap of Overheat Thermostat (STL) by screwing-off counter-
clockwise. STL located at right hand side of Boiler Control System
viewed from front side of the boiler.
Release STL by pushing button behind cap using a small screw
driver or ball point pen. Release is successful, when fault is gone on
display.
Screw-on cap of STL again (clockwise).
On the Boiler Control System there is an Overheat Thermostat. If the
boiler exceeds 220 °F (105 °C) it will shut off the Induced Draft Fan.
Overheat loop: with electricity
The Honeywell L4008B aquastat provided with the boiler is wired in
parallel with the thermostat on the zone with the most heating capacity
in the main living area. Upon reaching the aquastat set point 200 ºF (93
ºC) the heating zone will be activated, pulling heat away from the boiler.
The home owner is alerted to a potential problem with the boiler by an
overly warm living space.
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