2
USER’S
MANUAL
FT – A1, FT – A2, FT –B
HEAT DETECTORS
The detectors comply with EN 54-5:2003.
Compliance of the detectors with the type and class appear in Table 1.
Table 1
Model
Type
EN 54-5:2003 class
FT – A1 heat detector
Fixed temperature
1
FT – A2 heat detector
Fixed temperature
2
FT – B heat detector
Fixed temperature
The following abbreviations apply in the manual.
AL – alarm loop;
CP – control panel.
1 PURPOSE
1.1 The FT – A1 (FT – A2, FT –B) heat detectors are designed to control ambient temperature indoors.
1.2 When exceeding the threshold ambient temperature value in guarded premises the detector forms
the alarm signal for CP.
1.3 The Fire mode is indicated with 2 red optical indicators.
1.4 The indication of Fire mode depends on the AL type the detector is connected to. The indication in
DC AL is made with continuous light of optical indicators, and in AC AL – with flashing.
1.5 The detector indicates standby mode with short-term flashes of the red LED.
1.6 The detector is intended to operate all day long with CP by 2-wire AL with rated loop voltage
12/24V.
1.7 The MUSH-2 or MUSH-3 modules should be applied to connect detectors to 4-wire CP. .
2 TECHNICAL SPECIFICATIONS
2.1 Static response temperature range, ° :
- FT – A1
54 – 65
- FT – A2
54 – 70
- FT –
69 – 85
2.2 Supply voltage range, V 9 - 30
2.3 Standby current consumption at 30 V max, 0,1
2.4 Fire current consumption
set by external resistor in value range
, m 5 - 20
2.5 Internal resistance in Fire mode at 20 mA, Ohm 500
2.6 Dimensions, mm
85 × 33
2.7 Weight, g 50
2.8 Average lifespan, years 10