External Gas Valve; Optional Inputs; System Pressure Sensor; Gas Valve Leak Proving System - DeDietrich 310 ECO Series Installation And Operating Manual

8.8 Optional Inputs

8.8.1 System pressure sensor (optional)
The system pressure sensor shutdown the boiler (with shutoff code  ) when the minimum water
pressure is reached (adjustable 11-100 psig [0.8 – 6 bar] factory setting = 14.5 psig [bar], see section
12.2.12) the hydraulic pressure sensor must be connected on the 5-pin female plug X22 on the 24-volt
terminal strip. Press the  and  simultaneously for 2 seconds to indicate the presence of the
pressure sensor in the control.
8.8.2 Gas valve leak proving system VPS (optional)
The gas valve leak proving system checks and operates the safety valves on the gas valve multiblock.
The test takes place before the boiler pre-purge mode. In the event of a leak between the 2 valves in the
gas valve multiblock, the boiler will lock out and show the failure code  or  on the display. The
gas valve leak proving system must be fitted to the boiler and connected to the 3-pin female plug X21 on
the 24-volt terminal strip and the control set to recognize it using the parameter  in the setting mode
(see section 13.2.13)
8.8.3 Minimum gas pressure switch (suitable for gas pressures up t° 14" w.c. [30mbar])
The minimum gas pressure switch (set to 3.5 inches w.c. [8mbar]) shuts down the boiler (shut-off code
) if the inlet gas pressure becomes too low. The minimum gas pressure switch must be
connected to the 3-pin female plug X21 on the 24 –volt terminal strip. The connection is automatically
detected by the boiler control.
8.8.4 Flue gas damper (Gas 310 – optional, Gas 610 - standard)
In a positive pressure vent application, an optional flue gas damper can be installed to avoid hot flue
gases to pass through the boiler during the off periods. A vent damper is required for each Gas 310/610
boiler connected to Cat IV single boiler or Co-vented common venting system.
The flue gas damper [RGK] is wired to the boiler control
with a special 4-pin connector marked X14, the damper is
an 115v – 60Hz operated damper. See wiring on page
25.
Installation:
1. Install vent damper assembly on to the boiler flue
connector observe the flow direction
2. Route vent damper wire harness – supplied in
through the boiler casing channels so that it avoid
contact with any hot boiler components
3. Remove existing jumper on X14 connector on the
boiler control
4. Install the 4-pin from the vent damper
Once the vent damper is installed; the remaining venting
can now be completed.
Confirm the correct operation of the boiler equipped with this vent damper, the damper shall be in its
fully open position prior to allowing the boiler to start the pre-purge phase.

This optional device installed or not does not affect the overall efficiency of the boiler.

Please refer to the document supplied with the vent damper for detailed installation information.
De Dietrich Gas 310/610 ECO
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