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R31-STAV control unit
st
1
Burner cable
nd
2
Boiler sensor
Mains supply cable
Heating circuit pump cable
Loading pump cable
DHW cylinder cable
Adjusting the boiler thermostat
Changing the setting of the high limit
safety cut-out (STB) for R31-STAV
Control accessories
Please note:
Control unit installation
High limit safety cut-out
Ensure, during the control unit installationthat the sensor capillaries are not kinked or
Please note:
twisted and have only been pulled out of the boiler casing as far as necessary.
Do not route on-site cables for outside temperature and flow temperature sensors
together with mains power cables.
Electrical wiring in accordance with the wiring diagram enclosed.
Ensure that cables which are not required are secured against contact.
Observe the respective installation and operating instructions for
R32, R33 and R33/4 control units.
Control unit
Guide the cable through the casing lid cut-out, and secure the control unit housing on
the casing lid with the self-tapping screws supplied.
Guide the burner cables
stage
through the boiler front cut-out.
stage
Push the boiler sensors
in any order into the boiler sensor well.
Guide the mains supply cable, and the heating circuit pump cable
through the boiler back cut-out.
Guide the loading pump cable
(for DHW cylinder connection accessories) through the boiler back cut-out.
Guide the DHW cylinder cable
(for DHW cylinder connection accessories) through the boiler back cut-out.
If necessary, the boiler thermostat can be adjusted from 80 °C to 90 °C. To do this, turn
the boiler thermostat clockwise to its end-stop (80 °C); pull out the rotary selector approx.
3 mm and continue to turn clockwise to its end-stop (90 °C).
Please note: The boiler thermostat must not be set to 90 °C if the high limit safety
The high limit safety cut-out (STB) is factory-set to 120 °C.
Change the setting of the STB, if required.
Such changes are irreversible.
Disconnect the control unit from its power supply.
Remove the control unit lid with a screwdriver.
Unscrew the plastic cap and locking nut.
Remove the high limit safety cut-out.
Adjust the setscrew in accordance with the scale.
Install in reverse order.
Installation and electrical wiring according to the wiring diagram supplied with the
control accessories.
If Wolf boilers are equipped with control units not supplied by Wolf or if technical
modifications are carried out on Wolf control units, Wolf will not be liable for any
consequential losses which may occur.
cut-out has been adjusted to 100 °C.
7
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