PLANT ENGINEERING
FROST PROTECTION THERMOSTAT RTKSA CAPILLARY SYSTEM – TÜV-TESTED
TECHNICAL DATA
APPLICATION
Colour:
Anthracite grey (similar to RAL 7016), front side transparent
The RTKSA frost protection thermostat was designed especially for ensuring air or water-ex- posed frost protection for hot-water heating coils and heat exchangers in ventilation, heating or air conditioning systems. The capillaries, except RTKSA-203.000 / RTKSA-204.000 / RTKSA-204.020, are active along their entire length. The device actuates when the minimum response length of the capillary (at 3 m: 15 cm, at 6 m: 30 cm, at 12 m: 40 cm) reaches the set scale value. If a sensor rupture occurs, contact 1 – 2 is permanently opened and contact 1 – 4 is permanently closed in the STB / STW application. Unlocking is no longer possible with STB. Air-exposed application: For the frost protection of heating coils (except RTKSA-203.000 / RTKSA-204.000 / RTKSA-204.020) the capillaries are braced in front of the heating coil to be protected using mounting brackets. Mounting brackets JZ-05 / 6 M (metal) or JZ-05 / 6 K (plastic) should be used for this purpose. The RTKSA-203.000 / RTKSA-204.000 / RTKSA-204.020 types can be used in conjunction with the SWK-2-xxx protection coils to measure the temperature of non-aggressive gases in the duct.
Sensor material:
Cu
Max. sensor temperature: Max. head temperature: Permissible atmospheric humidity:
120 °C
80 °C
max. 95% rel. humidity, non-condensing
Operating voltage:
none
Max. switching current:
NC contact: 16 (2.5) A at 230 VAC +10% 0.25 A at 230 VDC +10% NO contact STW: 6.3 (2.5) A at 230 VAC +10% 0.25 A at 230 VDC +10% NO contact STB: 2.0 (0.4) A at 230 VAC +10% 0.25 A at 230 VDC +10% Min. 100 mA at 24 V (AC / DC) 230 VAC 50 / 60 Hz, 230 VDC 24 VAC / 50 Hz, 24 VDC
Min. switching current: Max. switching voltage: Min. switching voltage:
Switching element: Switching contact:
microswitch
toggler, potential-free
Control range:
−10 to +15 °C Push-in terminals
Electrical connection: Mounting / attachment:
Wall mounting; controller housing must be fitted in such a way that the ambient temperature is at least 2 K higher than the setpoint. I (including switch head and Cu capillary up to 4000 mm) in accordance with DIN EN 60730 (VDE 0631) Liquid-filled capillary, active over its entire length (except
Protection class:
Water-exposed application: The RTKSA-203.000 / RTKSA-204.000 /
Safety and EMC:
RTKSA-204.020 types can be used in conjunc - tion with the TH-140 immersion sleeves for tem - perature measurement in non-aggressive fluids and in conjunction with the NTH-140 immersion sleeves in aggressive fluids. Note: Mounting flanges, immersion sleeves and protecting coils are not part of the delivery scope and must be ordered separately as accessories.
Sensor:
RTKSA-203.000, RTKSA-204.000, RTKSA-204.020)
General features:
scale: degrees Celsius
Type testing by TÜV in accordance with DIN EN 14597
176
Catalogue 2025
Prices valid from 01.01.2025 – 31.12.2025, prices may be subject to change | V1
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