RTL

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​​​​​​​ Return temperature limiter with and without presetting Among other things, the return temperature limiter RTL is used to limit the return temperatures of radiators or combined floor/radiator systems to equalize the temperature of smaller floor surfaces (up to ca. 15 m2).

Models with presetting and automatic flow limitation (AFC)

Body made of corrosion-resistant gunmetal

Stainless spindle with double O-ring seal

Outer O-ring can be replaced while under pressure

Concealed limiting or blocking using stop clips

Technical description

Applications area:

Heating systems

Functions:

Maximum limitation of the return temperature.
Automatic flow limitation with Eclipse valves.
Stepless precision presetting with V-exact II valves.
Shut-off.
Temperature range is limited on both ends and can be blocked using covered stop clips.

Control behavior:

Proportional controller without auxilliary energy.

Dimensions:

DN 15

Pressure class:

PN 10

Temperature:

Max. working temperature: 120°C
Min. working temperature: 2°C

Maximum sensor temperature:

60° C

Specific extension:

0.10 mm/K,
Valve stroke limiter

Flow range Eclipse:

The flow can be stepless pre-set within the range: 10-150 l/h.
Delivery setting: Commissioning
(Max. nominal flow qmN at 10 kPa respecting EN 215: 115 l/h)

Differential pressure (ΔpV) Eclipse:

Max. differential pressure:
60 kPa (<30 dB(A))
Min. differential pressure:
10 – 100 l/h = 10 kPa
100 – 150 l/h = 15 kPa

Material:

RTL thermostatic head:
ABS, PA6.6GF30, brass, steel,
Thermostat filled with an expansible medium.

Valve body: corrosion resistant Gunmetal
O-rings: EPDM rubber
Valve disc: EPDM rubber
Return spring: Stainless steel
Valve insert: Brass, PPS
Spindle: Niro-steel spindle with double O-ring sealing. The outer O-ring can be replaced under pressure.

Surface treatment:

Valve body and fittings are nickel-plated.

Marking:

THE, flow direction arrow, DN, II+ -Designation.

Colour:

White RAL 9016

Pipe connection:

The female-threaded version is designed for connection to threaded pipe, or in conjunction with compression fittings, to copper precision steel or multi-layer pipe (only DN 15). The male-threaded version, in conjunction with the appropriate compression fittings, permits connection to plastic pipe.

Articles – RTL with Eclipse automatic flow limitation

Angle

DN
D
d2
l3
l4
H1
Flow range[l/h]
EAN
Article No
15 (1/2")
Rp1/2
R1/2
29
58
21,5
10-150
4024052931712
9113-02.000

Straight

DN
D
d2
l1
l2
H2
Flow range[l/h]
EAN
Article No
15 (1/2")
Rp1/2
R1/2
66
95
21,5
10-150
4024052931910
9114-02.000

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range
EAN
Article No
0 °C - 50 °C
4024052595112
6510-00.500

Articles – RTL with V-exact II stepless precision presetting

Angle

DN
D
d2
l3
l4
H1
Kv
p-band max. 2 K
Kvs
EAN
Article No
15 (1/2")
Rp1/2
R1/2
29
58
21,5
0,025 – 0,670
0,86
4024052899111
9103-02.000

Straight

DN
D
d2
l1
l2
H2
Kv
p-band max. 2 K
Kvs
EAN
Article No
15 (1/2")
Rp1/2
R1/2
66
95
21,5
0,025 – 0,670
0,86
4024052899319
9104-02.000

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range
EAN
Article No
0 °C - 50 °C
4024052595112
6510-00.500

Articles - RTL without presetting incl. RTL thermostatic head

Angle

Connection
Kvs
EAN
Article No
R1/2
2,00
4024052285716
9173-02.800

Angle

Connection
Kvs
EAN
Article No
G3/4
2,00
4024052285013
9153-02.800

Straight

Connection
Kvs
EAN
Article No
R1/2
2,00
4024052285914
9174-02.800

Straight

Connection
Kvs
EAN
Article No
G3/4
2,00
4024052285112
9154-02.800

*) SW1: 27 mm; SW2: 30 mm

Values H1 and H2 are at the bearing surface thermostatic head or actuator.


Kvs = m3/h at a pressure drop of 1 bar and fully open valve.

Attention: The RTL return temperature limiter without presetting is constructed from a special valve body and sensor element. Thermostatic valve bodies cannot be used.

Accessories

Thermostatic insert Eclipse with automatic flow limitation

for thermostatic valve bodies with II+ marking, from 2015.

Retrofitting/
Replacement inserts
For DN valve
EAN
Article No
10, 15, 20
4024052940912
3930-02.300

Thermostatic insert V-exact II with stepless precision presetting

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Retrofitting/
Replacement inserts
For DN valve
EAN
Article No
10, 15, 20
4024052841417
3700-02.300

Thermostatic insert V-exakt with precision presetting

For thermostatic valve bodies with boss marking, from 1994 to end of 2011.
With yellow label. Also suitable for reversed flow direction.

Retrofitting/
Replacement inserts
For DN valve
EAN
Article No
10, 15
4024052737611
3502-24.300
(also for DN 20 V-exakt valve bodies)

Note: After retrofitting to thermostatic inserts with presetting the appropriate RTL thermostatic head Article No 6510-00.500 has to be used.

Replacement heat transfer piece

for RTL thermostatic head 6510-00.500

EAN
Article No
4024052952113
6510-00.433

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2.
Female thread connection Rp1/2.
Metal-to-metal joint.
Brass nickel-plated.
Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer.

Ø Pipe
EAN
Article No
15
4024052175017
2201-15.351
16
4024052175116
2201-16.351

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Metal-to-metal joint.
Nickel-plated brass.
With a pipe wall thickness of 0.8-1 mm insert supporting sleeves. Heed pipe manufacturer’s technical advice.

Ø Pipe
EAN
Article No
12
4024052214211
3831-12.351
14
4024052214310
3831-14.351
15
4024052214617
3831-15.351
16
4024052214914
3831-16.351
18
4024052215218
3831-18.351

Support sleeve

for copper or precision steel pipe with a 1 mm wall thickness.
Brass.

Ø Pipe
L
EAN
Article No
12
25,0
4024052127016
1300-12.170
15
26,0
4024052127917
1300-15.170
16
26,3
4024052128419
1300-16.170
18
26,8
4024052128815
1300-18.170

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Soft sealed, max. 95°C.
Nickel-plated brass.

Ø Pipe
EAN
Article No
15
4024052515851
1313-15.351
18
4024052516056
1313-18.351

Compression fitting

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe
EAN
Article No
12x1,1
4024052136018
1315-12.351
14x2
4024052134618
1311-14.351
16x1,5
4024052136117
1315-16.351
16x2
4024052134816
1311-16.351
17x2
4024052134915
1311-17.351
18x2
4024052135110
1311-18.351
20x2
4024052135318
1311-20.351

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe
EAN
Article No
16x2
4024052137312
1331-16.351

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Female thread connection Rp1/2.
Nickel-plated brass.

Ø Pipe
Article No
16x2
4024052138616
1335-16.351

RTL thermostatic head

As spare part for return temperature limiter RTL without presetting.

Colour
EAN
Article No
white RAL 9016
4024052275311
6500-00.500

Spindle extension for RTL

Brass, nickel-plated.

L
EAN
Article No
20
4024052500215
9153-20.700

Insert for RTL

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

EAN
Article No
4024052909711
1305-02.300

Name Document Type Download All
RTL_EN_lq.pdf Technical Specifications
RTL_instruction.pdf Installation Instructions
RTL-Ersatzoberteil_Insert_instruction.pdf Installation Instructions
RTL_Replacement_head_Ersatzkopf_instr.pdf Installation Instructions
RTL-Kopf-Head_for_thermostatic_valves_instruction.pdf Installation Instructions
Color_Partner-clip_instr.pdf Installation Instructions
Conformity_Declaration_RTL.pdf Legal Documents

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