Cyclical Sealing Control Of The Gas Valve Unit (170, 210 Kw); Minimum Gas Pressure Switch; Max. Safety Temperature; Flow Controller - DeDietrich C 230 ECO Installation And Service Manual

3.4.2

Cyclical sealing control of the gas valve unit (170, 210 kW)

The sealing control system for the gas valve unit controls and checks
the safety valves in the combined gas valve unit. The VPS system
checks the tightness of the 2 valves during the pre-sweep, which
extends the pre-sweep time somewhat. If a leak is detected, the
boiler goes into safety shutdown (locking). The fault is indicated on
the DIEMATIC-m3.
3.4.3

Minimum gas pressure switch

It is possible to connect a minimum gas pressure switch to the PSG
connector. If there is a lack of gas pressure, the boiler is switched off
with a message on the DIEMATIC-m3 if the set value is not reached.
3.4.4

Max. safety temperature

The boiler goes into safety shutdown if the temperature is too high
(110°C or less). After the breakdown has been repaired, the boiler
can be unlocked by pressing the
3.4.5

Flow controller

The maximum difference in temperature between the outlet water
and the return water, and the speed at which the outlet temperature
increases, are restricted by the boiler's regulation.
This principle guarantees risk-free operation for the boiler even
during transitory irrigation operations induced by changes of status
on the installation's hydraulic units (closure 3-way valve, circuit
shutdown, etc.). These settings lead to the burner being put on
standby in order to protect the boiler from any damage.
We strongly recommend guaranteeing at all times a minimum flow
corresponding to 30% of the nominal flow Qn (flow corresponding to
a T of 20K at Pn at 80/60°C). This enables optimum operation of
the boiler's output range modulation device in order to get the best
out of condensation (See table below).
Maximum water flow: Flow speeds in the heating body which are too
high reduce the transfer of heat. Therefore, it is necessary to restrict
the water flow to the value obtained using the following formula:
Qmaximum = Nominal useful output to 80/60 °C / 9,3 (See table
below)
Boiler type
Q minimum
C230-85
Qn
Q maximum
Q minimum
C230-130
Qn
Q maximum
Q minimum
C230-170
Qn
Q maximum
Q minimum
C230-210
Qn
Q maximum
16
key.
Flow rate
3
(m /h)
1.0
3.4
8.6
1.6
5.2
12.9
2.1
6.9
17.2
2.6
8.6
21.5
The connection of the sealing control system is made by a plug that
can be found in the control panel. The presence of the sealing control
system must be activated by the parameter "Kit CCE".
The boiler restarts when the pressure is back to normal and after the
waiting time of 10 minutes.
The C 230 ECO boiler is fitted with an electronic temperature
regulator with flow and return temperature sensors.
C 230 ECO 03/10/2012 - 300015171-001-01