Danfoss One-pipe solution portfolio Data sheet
Data sheet
One-pipe solution portfolio
Description
One-pipe solution portfolio is a complete set
of Danfoss products that ensures efficient
and reliable operation of one-pipe heating
applications. There are 3 solutions:
- AB-QM dynamic balancing
- QT dynamic balancing with self-acting
thermostat
- AB-QTE dynamic balancing with electronic
control.
Applications In one-pipe systems flow in the riser is always
present. TRV on the radiator controls room
temperature by controlling flow through
radiator. However, by reducing flow through the
radiator, water flow is not reduced but diverted
to a by-pass and thus total water flow in the riser
remains permanent. Therefore at partial loads
water temperature in the pipe is increasing.
As a result the riser itself with the by-pass pipe
continues to heat the room. This can cause
overheating of the room. After the building
is renovated the heating system becomes
oversized since the heat losses of the building
decrease. As a result overheating issue increases
even more.
AB-QM mounted in the riser provides a robust
solution that offers reliable balance of onepipe heating system at all system conditions.
As a result, every riser gets design flow – and
never more than that. Each riser becomes an
independent part of installation.
On top of that, QT and AB-QTE convert a onepipe heating system into an energy efficient
variable flow system.
QT and AB-QTE provide flow control through the
temperature of return water in the risers. By this
water flow in the riser is dynamically controlled
to match the actual load in the riser. This results
in improved room temperature control and
greatly reduced overheating of the building.
Thus one-pipe systems become energy efficient
variable flow systems, similar as two-pipe
systems are.
In addition, AB-QTE features electronic control of
return water temperature according to weather
compensated supply water temperature as well
as service functions that can greatly help to
monitor and service a one-pipe heating system
in a building.
Typical applications are:
- one-pipe vertical riser based heating system
- one-pipe horizontal loop based heating
system
- two-pipe vertical riser based heating system
without TRV’s, such as staircase or bathroom
risers
© Danfoss | 2020.04 AI042486471627en-000302 | 1
Data sheet One-pipe solution portfolio
AB-QM
Product data:
• Sizes AB-QM 4.0 DN 15-20
• Available setting range: 30-2.100 l/h
• PN 25, max 95 °C
AB-QM is an dynamic balancing valve with the
following main features:
- Exact and pressure independent flow
limitation allows no overflows at all conditions
- “Set & Forget” setting of required flow: flow
setting for the riser is a matter of a simple turn
of the setting ring; no additional calculation
or measuring is needed
- full flexibility of flow adjustment: AB-QM can
be set to a precise design value even when
the system is up and running so no need for
draining the system or use of flow charts or
calculations; easy adjustability allows late
change of design flows without high costs
- commissioning costs are minimal because of
the automatic flow limitation function
Benefits • Perfect hydronic balance at all conditions
• Riser/loop independence: each riser/loop
becomes independent part of the heating
system
• Reliable heating system that results with
even heat distribution and no under-heating
claims.
- “Plug and Play” even when installation is
not yet completely finished. For example
when some floors are already occupied
while construction is still going on at other
floors, the occupied floors are already fully
functional and balanced.
Fig. 1 AB-QM in the vertical riser
Ordering
AB-QM threaded version
Picture DN
For details on AB -QM and accessories pleas e refer to AB-QM datasheet .
Qmax. Ext. thread Int. thr ead
(l/h) (ISO 228/1) (I SO 7/1) (l/h) (ISO 228/1) ( ISO 7/1)
15 LF 200 003Z8200 003Z8300 15 LF 200 003Z 8220 003Z8320
15 650 003 Z8201 003Z 8301 15 650 003Z82 21 0 03Z8321
20 1,10 0 003Z8203 003Z8303 20 1,10 0 003Z8223 003Z8323
25 N/A N/A N/A 25 N/A N/A N/A
32 N/A N/A N/A 32 N /A N/A N/A
AB-QM DN
Qmax. Ext. thread Int. thread
2 | AI042486471627en-000302 © Danfoss | 2020.04
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