Outside Temperature Sensor (Tout); Minimum Gas Pressure Switch (Gps); Gas Leakage Control (Vps; Only For 230- 160 And 230- 200 Boilers) - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

8 Control and electrical connections
Fig. 19 Heating curve graph
F = factory setting
48
8.7.6

Outside temperature sensor (Tout)

To take advantage of the boiler's modulating operation during the
entire heating season, an outside temperature sensor (available as an
accessory) can be used in combination with an on/off control or
connection. Connect the on/off control or connection to the On/off
terminals of terminal strip X6 on the standard control PCB (PCU-01)
and the outside temperature sensor to the Tout terminals of terminal
strip X5 on the optional expanded control/protection PCB (SCU-S01).
The unit modulates with a heat demand from the controller or because
of a connection to a flow temperature corresponding to the outside
temperature (see heating curve graph).
Fitting the outside temperature sensor
Fit the external sensor, protected against direct sunlight, to the north
or north-west side of the building, at a height of at least 8 feet (2.5
metres) from ground level. Do not fit the outside temperature sensor
near windows, doors, ventilation grills and extractors, etc.
Heating curve setting
The maximum flow temperature setting is also the setting for the 'top'
of the heating curve, i.e. the required flow temperature for an outside
temperature of 5°F (-15°C). The baseline of the heating curve is also
adjustable and can be changed at service level, see Section 9.1.6. A
linear relationship exists between the outside temperatures
mentioned and the corresponding flow temperatures.
8.7.7

Minimum gas pressure switch (Gps)

The minimum gas pressure (available as an accessory) switch shuts
the boiler down if the inlet gas pressure becomes too low. Connect the
minimum gas pressure switch to the Gps terminals of terminal strip
X5. The presence of the gas pressure switch must be activated using
parameter 27 in the setting mode.
8.7.8 Gas leakage control (VPS; only for 230- 160
and 230- 200 boilers)
The gas leakage control checks and controls the safety valves on the
gas block via a VPS system. The test takes place when the boiler
starts. In the event of a leak in the gas block, the boiler will lock out.
Connect the gas leakage control to the VPS terminals of terminal strip
X5. The presence of a gas leakage control must be entered using
parameter 31.
C230 ECO-A