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
Data sheet One-pipe solution portfolio
QT
QT is a solution for dynamic balancing and selfacting return temperature control in
one-pipe heating systems. QT consists of
• AB-QM dynamic balancing valve
• QT self-acting thermostat
Feature list includes all AB-QM related features
with following QT related additional ones:
- return water temperature control
- QT prevents return temperature to rise at
partial loads
- QT transforms one-pipe heating system into a
variable flow system
- QT controls flow according to actual load,
similar as in two-pipe system.
… 19
20
Fig. 2 - AB-QM with QT acting thermostat
Benefits - Perfect hydronic balance at all conditions: it
means reliable heating system that results
with even heat distribution and no underheating claims
- each riser/loop becomes independent part of
the heating system
- reduced heat losses in the pipes due to low
return temperature
- less overheating of the rooms due to vastly
improved indoor temperature control
- QT saves energy when matters most since it is
most effective at low outdoor temperatures
when energy consumption is high.
Ordering
QT thermostatic actuator
Picture
Setting range
(°C)
35 … 50
45 … 60 003Z0398
65 … 85 003Z0399
fit to
AB-QM
DN 15-20
Code No.
003Z0397
AB-QM valves (refer to page 2)
For details on AB -QM and QT with accessories plea se refer to AB-QM and QT datashe ets respectively.
QT:
one-pipe variable flow
Riser Flow [l/h]
Load [W]
Time
Fig. 3
AI042486471627en-000302 | 3© Danfoss | 2020.04
Danfos
produc
Al
Danfoss A/S
Heating Segment • heating
Data sheet One-pipe solution portfolio
AB-QTE
Benefits
AB-QTE is a top of the line electronic solution
for dynamic balancing and electronic return
temperature control in one-pipe heating
systems. AB-QTE consists of:
• CCR3+ controller
• AB-QM dynamic balancing valve
• TWA-Q actuator
• ESMC surface temperature sensor
One CCR3+ controller connects up to 20
(expansion up to 36 riser with CCR+ Slave Unit)
risers in intelligent, electronically controlled
- Perfect hydronic balance at all conditions:
reliable heating system that results with even
heat distribution and no under-heating claims
- each riser/loop becomes independent part of
the heating system
- reduced heat losses in the pipes due to low
return temperature
modulating control system for return
temperature control in one-pipe systems. For
buildings with more risers, the system can easily
be expanded with additional CCR3+ modules.
Each riser is equipped with AB-QM, TWA-Q
actuator and ESMC surface temperature sensor.
One additional ESMC sensor is needed to provide
input for supply water temperature.
Feature list includes all AB-QM related features
with following additional ones:
- Dynamic return water temperature control
based on supply water temperature: it works
during whole heating season even at high
outside temperatures
- AB-QTE prevents return temperature to rise at
partial loads
- AB-QTE transforms one-pipe heating system
into a variable flow system at all conditions
- AB-QTE controls flow according to actual
load, similar as in two-pipe system
- Return temperature monitoring and resetting
per each individual riser.
- less overheating of the rooms due to vastly
improved indoor temperature control
- Best energy efficiency: AB-QTE saves energy
throughout the heating season
- Electronic & central monitoring, service and
resetting of each individual riser
-
System expansion via CCR+ Slave Unit (+16 risers)
…
Ordering
Learn more on
www.danfoss.com/onepipesolutions
s can accept no responsibility for possible errors in catalogues, brochures and o ther printed material. Danfoss reserves the right to alter its products w ithout notice. This also applies to
ts already on order provided that such alterations can be m ade without subsequential changes being necessary in specications already agreed.
l trademarks in this material are p roperty of the respective companies. Danfoss and all Danfoss logot ypes are trademarks of Danfoss A/S. All rights reserved.
Fig. 4
Typ e Designation Voltage Actuator type Code No.
CCR3+ Controller
CCR3+ Slave Unit System expansion (add 16 risers) 24 V DC NO/16 003Z3852
AB-QM threade d version (refer to page 2)
Return Temperature Controller &
Temperature Registration
Accessory
Typ e Designation Voltage Comments Data she et Code No.
TWA-Q (NO)
ESMC (PT 1000) Surface sensor - 2 meters cable VD.74.I7.02 08 7N00 11
Set:
TWA-Q (NO) with ESMC (PT 1000)
For details on AB -QM, TWA-Q, ESMC a nd CCR3+ controllers wit h accessories please refer to pro duct datasheets respec tively.
1)
30-70 % recommended A B-QM flow sett ing.
.danfoss.com • +45 7488 2222 • E-Mail: heating@danfoss.com
1)
Thermal actuators 24 V 1.2 m. cable VD.MJ. D1.02 082F16 03
Thermal actuators with
surface sensor
24 VDC
24 VDC NO/20 003Z0396
24 V 003Z0378
© Danfoss | DHS-SRMT/SI | 2020.044 | AI042486471627en-000302
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