Xylem MOH1 Single or dual zone mixing module (obsolete) - Manual (Page 6)

6
Installation and operation manual MOH1
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Filling of the system
It is mandatory to flush the floor heating loops before putting the
system in operation, because otherwise malfunction or damage to the
pump may result. We recommend using two fill valves on the primary
side of the BM mini as shown in picture . Alternatively, the system
can be filled using fill valves installed elsewhere in the system. In any
case, it is necessary to positively flush the system since otherwise the
air in the system will not be purged completely. Filling the system via
the integrated manual air vent (see picture 7) is not possible! Please
observe the position of the ball valve in the bypass. If this is in the ver-
tical position, the floor heating loops are hydraulically uncoupled from
the boiler loop. This position is ideal for normal operation (see picture
1) since the pump in the heating loop does not influence the floor
heating loop. With the valve in this position, however, the floor heating
system cannot be filled from the primary side.
To fill the floor heating loops from the heating loop side, this ball valve
must be closed (horizontal) – see pictures 2 through 6. After filling, the
valve must be opened again (vertical position). Please observe that
when filling from the primary side radiator valves on that side should
be closed in order to have maximum pump pressure available for
purging the floor heating loops.