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 |
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present. TRV on the radiator controls room |
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temperature by controlling flow through |
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radiator. However, by reducing flow through the |
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radiator, water flow is not reduced but diverted |
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to a by-pass and thus total water flow in the riser |
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remains permanent. Therefore at partial loads |
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water temperature in the pipe is increasing. |
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As a result the riser itself with the by-pass pipe |
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continues to heat the room. This can cause |
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overheating of the room. After the building |
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is renovated the heating system becomes |
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oversized since the heat losses of the building |
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decrease. As a result overheating issue increases |
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even more. |
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AB-QM mounted in the riser provides a robust |
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solution that offers reliable balance of one- |
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pipe heating system at all system conditions. |
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As a result, every riser gets design flow – and |
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never more than that. Each riser becomes an |
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independent part of installation. |
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On top of that, QT and AB-QTE convert a one- |
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pipe heating system into an energy efficient |
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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 |
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AB-QM |
Product data: |
- “Plug and Play” even when installation is |
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• Sizes AB-QM 4.0 DN 15-20 |
not yet completely finished. For example |
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• Available setting range: 30-2.100 l/h |
when some floors are already occupied |
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• PN 25, max 95 °C |
while construction is still going on at other |
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floors, the occupied floors are already fully |
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AB-QM is an dynamic balancing valve with the |
functional and balanced. |
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following main features: |
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- Exact and pressure independent flow |
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limitation allows no overflows at all conditions |
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- “Set & Forget” setting of required flow: flow |
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setting for the riser is a matter of a simple turn |
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of the setting ring; no additional calculation |
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or measuring is needed |
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- full flexibility of flow adjustment: AB-QM can |
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be set to a precise design value even when |
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the system is up and running so no need for |
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draining the system or use of flow charts or |
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calculations; easy adjustability allows late |
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change of design flows without high costs |
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- commissioning costs are minimal because of |
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the automatic flow limitation function |
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Benefits |
• Perfect hydronic balance at all conditions |
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• Riser/loop independence: each riser/loop |
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becomes independent part of the heating |
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system |
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• Reliable heating system that results with |
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even heat distribution and no under-heating |
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claims. |
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Fig. 1 AB-QM in the vertical riser
Ordering |
AB-QM threaded version |
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Picture |
DN |
Qmax. |
Ext. thread |
Int. thread |
AB-QM |
DN |
Qmax. |
Ext. thread |
Int. thread |
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(l/h) |
(ISO 228/1) |
(ISO 7/1) |
(l/h) |
(ISO 228/1) |
(ISO 7/1) |
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15 LF |
200 |
003Z8200 |
003Z8300 |
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15 LF |
200 |
003Z8220 |
003Z8320 |
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15 |
650 |
003Z8201 |
003Z8301 |
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15 |
650 |
003Z8221 |
003Z8321 |
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20 |
1,100 |
003Z8203 |
003Z8303 |
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20 |
1,100 |
003Z8223 |
003Z8323 |
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25 |
N/A |
N/A |
N/A |
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25 |
N/A |
N/A |
N/A |
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32 |
N/A |
N/A |
N/A |
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32 |
N/A |
N/A |
N/A |
For details on AB-QM and accessories please refer to AB-QM datasheet.
2 | AI042486471627en-000302 |
© Danfoss | 2020.04 |
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