Data Sheet
Flow Restrictors for One-Pipe Systems
Application
RTD-CB back-flow restrictor |
RTD-BR bypass restrictor |
Principle
Heat Transfer
The RTD-CB back-flow restrictor prevents radiator back-flow and heat transfer at the return pipe in a one-pipe system.
The back-flow restrictor is installed in the radiator return pipe with the bow pointing upwards.
Radiator
The RTD-BR bypass restrictor decreases flow through the bypass in a one-pipe system, thus forcing the correct amount of system water to pass through the radiator.
The bypass restrictor will decrease the bypass with one dimension ( e.g. DN 20 > DN 15).
The bypass restrictor is installed in the bypass by the radiator.
Convector
90 ˚C |
90 ˚C |
TRV |
TRV |
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RTD-BR |
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RTD-BR |
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RTD-CB |
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MIN. 175 MM |
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MIN. 175 MM |
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RTD-CB |
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1. Heat cost allocator (the heat cost allocator is placed according to the manufacturer’s instructions.)
The RTD-CB back-flow restrictor reduces heat transfer from system pipes to radiator, when the TRV is closed.
With the bypass placed 175 mm from the radiator, a flow temperature of 90 ˚C and a room temperature of 20 ˚C, the max. detected temperature is:
Heat cost allocators with a single |
28 ˚C |
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sensor for radiator surface |
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Heat cost allocators with two |
room temp. |
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sensors for radiator surface / room |
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+ 5 °C |
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temperature |
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Danfoss Heating Solutions |
VDCHA202 |
© Danfoss |
02/2011 |
1 |
Data Sheet |
Flow Restrictors for One-Pipe Systems |
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Data and Ordering |
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Connections |
Kvs |
Max. |
Test |
Max. |
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Type |
Size |
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work. |
work. |
Code no. |
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Inlet |
Outlet |
press. |
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press. |
temp. |
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RTD-CB back-flow |
DN 15 |
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R 1/2 |
Rp 1/2 |
4.54 m³/h |
10 bar |
16 bar |
120 °C |
013L1925 |
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restrictor |
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RTD-CB back-flow |
DN 20 |
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R 3/4 |
Rp 3/4 |
8.06 m³/h |
10 bar |
16 bar |
120 °C |
013L1926 |
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restrictor |
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RTD-CB back-flow |
DN 25 |
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R 1 |
Rp 1 |
17.0 m³/h |
10 bar |
16 bar |
120 °C |
013L1927 |
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restrictor |
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RTD-BR bypass |
DN 15/10 |
G 1/2 |
G 1/2 |
6.80 m³/h |
10 bar |
16 bar |
120 °C |
013L1915 |
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restrictor |
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RTD-BR bypass |
DN 20/15 |
G 3/4 |
G 3/4 |
15.1 m³/h |
10 bar |
16 bar |
120 °C |
013L1916 |
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restrictor |
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Dimensions |
Back-flow restrictor |
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RTD-CB |
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S1 |
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S2 |
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<![if ! IE]> <![endif]>L3 |
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D |
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D2 |
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L1 |
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L2 |
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Material: Stainless steel, AISI 316 |
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Type |
L1 |
L2 |
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L3 |
D |
d2 |
S1 |
S2 |
Code no. |
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RTD-CB DN 15 |
69 |
96 |
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32 |
Rp 1/2 |
R 1/2 |
27 |
30 |
013L1925 |
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RTD-CB DN 20 |
76 |
106 |
48 |
Rp 3/4 |
R 3/4 |
32 |
37 |
013L1926 |
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RTD-CB DN 25 |
90 |
126 |
48 |
Rp 1 |
R 1 |
41 |
46 |
013L1927 |
Bypass restrictor RTD-BR
S1 |
S2 |
<![if ! IE]> <![endif]>D1 |
<![if ! IE]> <![endif]>D4 |
<![if ! IE]> <![endif]>D2 |
<![if ! IE]> <![endif]>D3 |
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L2 |
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L1 |
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L3 |
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Material: Black steel, ASTM A 216 WCB
Type |
L1 |
L2 |
L3 |
D1 |
D2 |
D3 |
D4 |
S1 |
S2 |
Code no. |
RTD-BR DN 15/10 |
27.3 |
24 |
47.5 |
G 1/2 |
G 1/2 |
G 1 |
Ø11 |
26 |
40 |
013L1915 |
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RTD-BR DN 20/15 |
32 |
25.5 |
51.5 |
G 3/4 |
G 3/4 |
G 5/4 |
Ø16 |
32 |
50 |
013L1916 |
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2 |
VDCHA202 |
© Danfoss |
02/2011 |
Danfoss Heating Solutions |