Construction And Function; Installation - oventrop Multidis SFQ Installation And Operating Instructions For The Specialised Installer

5 Construction and function
5.1 Summary and functional description
The stainless steel distributors/collectors "Multidis
SFQ" are designed for use in surface heating and
cooling systems with circulation pump. The risers can
be connected to the distributor/collector from either
the left or right hand side.
The brackets allow for the fi xing of the distributor/
collector in the cabinet or directly onto the wall. The
fl at sealing ball valves are directly connected to the
collar nut (G 1 female thread) of the distributors/
collectors.
Standard heat meters G 1 and G
The installation depth and length of the stainless steel
distributor/collector "Multidis SFQ" will be increased
as a result. This has to be taken into consideration
when selecting the cabinet.
The heating/cooling circuit connections have a G
male thread according to DIN EN 16313 (cone "Euro")
(illustr. 4.1).
Printed tags for marking the surface heating/cooling
circuit connections are supplied with the distributors/
collectors.
For fi lling, fl ushing and bleeding of the surface heating/
cooling circuits, the stainless steel distributors/collectors
"Multidis SFQ" are equipped with fi ll and drain valves
with connection for a DN 15 hose.
The Oventrop valve insert "QM" is an infinitely
presettable, diaphragm controlled and differential
pressure independent valve insert for automatic fl ow
control (hydronic balancing) in surface heating and
cooling systems. The fl ow control unit integrated in
the valve insert keeps the differential pressure at a
constant level via the presetting and regulating cross
section of the valve.
The required fl ow rate is set by turning the handwheel
(illustr. 5.1, pos. 3) with the enclosed presetting key
(illustr. 5.1, pos. 5).
Even where high differential pressure variations occur,
for instance if sections of the system or heating/cooling
circuits are activated or inactivated, the fl ow rate is
kept at a constant level within the regulation tolerances.
This way, the valve authority of the valve inserts "QM"
amounts to 100 % (a = 1). Even during part load
conditions with steady control (for instance in
combination with thermostats for room temperature
control) the valve authority of the valve inserts "QM"
amounts to 100 % (a = 1) within the effective valve lift.
10
⁄ can be installed.
3
4
⁄
3
4
Illustr. 5.1 Construction valve insert "QM"
5.2 Application
The stainless steel distributors/collectors "Multidis SF"
allow for the central distribution of the heating/cooling
water to the different circuits of the dwelling unit.
Together with electrothermal actuators and room
thermostats which are available as accessories, the
valve inserts "QM" in the return collector which are
convertible to thermostatic operation, can be used for
individual room temperature control.
The room temperature is regulated by varying the
volume fl ow of the heating or cooling water.
Hydronic balancing is carried out automatically using
the integrated valve inserts "QM".
The stainless steel distributors/collectors "Multidis
SFQ" are to be equipped with ball valves (illustr. 4.3).
They allow for the isolation of the supply and return
pipe, e.g. for maintenance work.

6 Installation

6.1 Extent of supply
Before installation, check the delivery for completeness
and any damages caused during transit.
6.2 Installation
The flow distributor and return collector are pre-
assembled and leak tested. Mount the fl ow distributor
(at the top) and the return collector (at the bottom) into
the sound-absorbing brackets (illustr. 4.1).
1 Valve insert "QM"
3 Handwheel
4 Protection cap
5 Presetting key
6 Connecting nipple
7 Return collector
∆p Differential pressure
NOTICE
The fl ow distributor always has to be installed
at the top and the return collector at the
bottom of the bracket.