Gas Connection; Gas Pressure; Air Supply/Flue Gas Outlet Connections; Outlets - DeDietrich Innovens MCA 160 Manual

5 Installation
7 Drain valve
8 Flow sensor (clamp or immersion sensor)
9 Expansion vessel
10 Calorifier sensor
11 Outside temperature sensor
5.2

Gas connection

5.3

Air supply/flue gas outlet connections

38 MCA
12 Mixing valve
13 System pump
14 Flow sensor
15 Thermostatic valve
16 Central heating system
The boilers are suitable for use with all types of natural gas and propane.
In the case of MCA 160 boilers, the gas connections are at the bottom of
the boiler and have a 1" male thread. There must be a main gas cock
close to the boilers.
Important
Consult the documentation supplied with the boiler in order to find
the correct gas category.
When cascade systems are used, manual seals for the gas pipes are in­
cluded for each boiler. A gas filter for the gas supply pipe is available as
an accessory.
Important
We recommend installing a gas filter to prevent clogging of the
gas valve units.
5.2.1

Gas pressure

The required inlet working pressure per boiler is 17 to 25 mbar. For pro­
pane operation, see the installation and service manual for the boiler con­
cerned. The usual inlet pressure for commercial propane (37 - 50 mbar)
can be used.
The correct burner pressure setting for natural H gas (G20) is set at the
factory and, in principle, does not need readjusting.
The boilers can be used in room-ventilated or room-sealed operation. The
room-ventilated version extracts the necessary combustion air from its en­
vironment. In this case via an air supply opening at the top of the boilers.
By installing an air supply pipe on the air supply opening, you obtain a
room-sealed system. This increases the number of possible locations with­
in the building. Moreover, combustion air extracted directly from outside is
generally cleaner than air from inside.
5.3.1

Outlets

The outlet for a flue gas connection must be through the roof. The outlet
must be in area I or II for the open version. Other outlet areas are possible
for the closed version. The outlet for the flue gas outlet and the air supply
must be in the same pressure range. Use the same diameters for the air
supply channels and the flue gas outlet channels.
Important
Contact us for more information.
5.3.2

Individual flue gas outlet

If there is insufficient height for a joint flue gas outlet and/or air supply, in­
dividual roof feed-throughs can be fitted. When installing a small number
of boilers, it is also more economical to give them an individual flue gas
outlet. For sealed systems, the individual roof feed-throughs must be in­
stalled at the same height on flat or sloping roofs This avoids flue gases
from one boiler being taken in by another boiler. From an aesthetic point of
view, the individual roof feed-throughs can be placed within a single feed-
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