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Description
Duct frost protection thermostat
THERMASREG® FST-K
Mechanical frost protection thermostat/ frost monitor THERMASREG® FST-K with switching output, duct tube monitored across the entire length, with automatic reset or with mechanical locking, with / without optional manual reset.
The frost protector is suitable for air side temperature monitoring at heat exchangers and heating
registers to prevent freezing up and to avoid frost damage, e.g. in ventilation and air conditioning ducts. The FST-K is intrinsically safe and is equipped with sensor breakage detection. In the event of damage to the capillary membrane system, the frost sensor automatically switches to the heating function. The scope of delivery includes the mounting flange MF-14-K.
registers to prevent freezing up and to avoid frost damage, e.g. in ventilation and air conditioning ducts. The FST-K is intrinsically safe and is equipped with sensor breakage detection. In the event of damage to the capillary membrane system, the frost sensor automatically switches to the heating function. The scope of delivery includes the mounting flange MF-14-K.
Technical details
Operating difference
2 ± 1 K (3.6 ± 1.8 °F)
Contact
dust-proof micro switch
as single-pole potential-free changeover contact
as single-pole potential-free changeover contact
Reproducibility
± 0.5 K (± 0.9 °F)
Setting range
–10...+15 °C/ +14 °F...+59 °F,
factory setting to w = +5 °C (+41 °F)
factory setting to w = +5 °C (+41 °F)
Permissible medium
Air
Switching capacity
10 (2) A, AC 250 V;
because of gold-plated switching contacts
also switching of signal voltages < 24 V
because of gold-plated switching contacts
also switching of signal voltages < 24 V
Process connection
by mounting flange, plastic
(included in the scope of delivery)
(included in the scope of delivery)
Protective tube
metal, material CuZn37 (2.0321),
Ø 14 mm, NL = 205 mm
Ø 14 mm, NL = 205 mm
Electrical connection
0.14 - 2.5 mm²
via terminal screws
via terminal screws
Housing dimensions
108 x 70 x 73,5 mm (Thor 2)
Ambient temperatures
maximum operating temperature: +70 °C (+158 °F)
minimum operating temperature: w + min. +2 °C (min. +3.6 °F)
storage/ transport: –30...+70 °C (–22...+158 °F)
capillary: max. +150 °C (+302 °F)
minimum operating temperature: w + min. +2 °C (min. +3.6 °F)
storage/ transport: –30...+70 °C (–22...+158 °F)
capillary: max. +150 °C (+302 °F)
Cable gland
M 20 x 1.5; including strain relief
Protection class
I (according to EN 60 730-1)
Housing
plastic, UV-stabilised,
material polyamide, 30 % glass-globe-reinforced,
colour traffic white (similar to RAL 9016)
material polyamide, 30 % glass-globe-reinforced,
colour traffic white (similar to RAL 9016)
Protection type
IP 65 (according to EN 60 529)*
Standards
CE conformity,
EMC directive 2014/ 30/ EU,
low-voltage directive 2014/ 35/ EU
EMC directive 2014/ 30/ EU,
low-voltage directive 2014/ 35/ EU
Function
Contact C - 2: danger of frost/ sensor breakage
Contact C - 3: normal operation
Contact C - 3: normal operation
Resetting
automatic
Other materials
mechanical sheet metal parts: galvanised steel
capillary tube: copper
capillary tube filling: R 507
switching contacts: Ag/ Ni (90%/ 10%) gold-plated (3 m)
capillary tube: copper
capillary tube filling: R 507
switching contacts: Ag/ Ni (90%/ 10%) gold-plated (3 m)