Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Issue 1 Page 2-5
February 2001
2.3 Detector
The Detector consists of a backbox with a removable cover, incorporated within the Detector are a
detector head, termination board and a fan. These three items are the major elements of the Detector,
refer to Figure 2.3 detailing the detector block diagram. The design of the Detector allows surface
mounting, thus providing ease of installation and maintenance. Replacement of any of the detector’s
main elements can be achieved without the need to remove the backbox, conduit, inlet or exhaust pipe.
The fan is mounted in a plenum within the Detector and is controlled via the termination board, thus
ensuring optimal fan speed. An LED located on the front panel of the Detector provides a visual
indication of the current system status. Two types of Detector are available; standard and ultra sensitive.
The ultra sensitive version is recommended for use in clean room applications only.
Table 2.1 Detector Specifications
DESCRIPTION SPECIFICATION
Part Number (With Standard Head) 53836-K183
Part Number(With Ultra Head) 53836-K186
Weight 3.4 kg (7.5 lbs)
Finish Polycarbonate Light Grey Material
Input Voltage 18 to 30 V DC (24 V DC nominal)
Stand Alone With Display Module
Input Current (With Standard Head) 315 mA 345/445 mA *
Input Current (With Ultra Head) 395 mA 425/525 mA *
Operating Temperature
0° to 52° C (32° to 125° F)
Operating Humidity (With Standard Head) 10 to 95% non condensing
Operating Humidity (With Ultra Head) 10 to 70% non condensing
Alarm Relay Normally open contacts, 2 Amp @ 28 V DC, resistive
Pre-Alarm Relay Normally open contacts, 2 Amp @ 28 V DC, resistive
Isolate Relay Normally open contacts, 2 Amp @ 28 V DC, resistive
Trouble Relay Normally closed contacts, 2 Amp @ 28 V DC, resistive
Electrical Connection Up to 18 GA field wiring to removable terminal blocks
Service Port Connection RJ12 – RS232 communications
Network Connection 2 pair – RS485 communications
Remote Display Connection RS485 communications (4 core including power)
Air Inlet Port 0.75 inch threaded
Exhaust Port 1 inch
* Back-light off/Back-light on