Danfoss RTD-CB, RTD-BR Data sheet
90 ˚C
TRV
RTD-CB
min. 175 mm
RTD-BR
1
90 ˚C
TRV
RTD-CB
min. 175 mm
RTD-BR
1
Data Sheet
Flow Restrictors for One-Pipe Systems
Application
RTD-CB back-flow restrictor RTD-BR bypass restrictor
Principle
The RTD-CB back-flow restrictor prevents radiator
back-flow and heat transfer at the return pipe in a
one-pipe system.
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 back-flow restrictor is installed in the radiator
return pipe with the bow pointing upwards.
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.
Radiator Convector
1. Heat cost allocator (the heat cost allocator is placed according to the manufacturer’s instructions.)
Heat Transfer
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
Heat cost allocators with a single
sensor for radiator surface
Heat cost allocators with two
sensors for radiator surface / room
temperature
temperature is:
Danfoss Heating Solutions VDCHA202 © Danfoss 02/2011 1
28 ˚C
room temp.
+ 5 °C
L1
L2
d2
D
L3
S1
S2
S1
S2
L3
L1
L2
D1
D4
D2
D3
Data Sheet Flow Restrictors for One-Pipe Systems
Data and Ordering
Dimensions
Type Size
RTD-CB back-flow
restrictor
RTD-CB back-flow
restrictor
RTD-CB back-flow
restrictor
RTD-BR bypass
restrictor
RTD-BR bypass
restrictor
DN 15 R 1/2
DN 20 R 3/4
DN 25 R 1
DN 15/10 G 1/2 G 1/2 6.80 m³/h 10 bar 16 bar 120 °C 013L1915
DN 20/15 G 3/4 G 3/4 15.1 m³/h 10 bar 16 bar 120 °C 013L1916
Back-flow restrictor
RTD-CB
Connections
Inlet Outlet
Rp 1/2
Rp 3/4
Rp 1
K
work.
vs
press.
Max.
Test
press.
Max.
work.
temp.
Code no.
4.54 m³/h 10 bar 16 bar 120 °C 013L1925
8.06 m³/h 10 bar 16 bar 120 °C 013L1926
17.0 m³/h 10 bar 16 bar 120 °C 013L1927
Material: Stainless steel, AISI 316
Type
L
RTD-CB DN 15 69 96 32
RTD-CB DN 20 76 106 48
RTD-CB DN 25 90 126 48
L
1
L
2
3
D
Rp 1/2
Rp 3/4
Rp 1
d
2
S
S
2
Code no.
1
R 1/2 27 30 013L1925
R 3/4 32 37 013L1926
R 1 41 46 013L1927
Bypass restrictor
RTD-BR
Material: Black steel, ASTM A 216 WCB
Type
1
2
D
3
D
1
D
2
3
D4S1S
2
Code no.
L
L
L
RTD-BR DN 15/10 27.3 24 47.5 G 1/2 G 1/2 G 1 Ø11 26 40 013L1915
RTD-BR DN 20/15 32 25.5 51.5 G 3/4 G 3/4 G 5/4 Ø16 32 50 013L1916
2 VDCHA202 © Danfoss 02/2011 Danfoss Heating Solutions
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