Evolution EVC-H Instruction Manual

Document No. NISM/EVC-H/01
Date NOV 2003

NITTAN (UK) LTD.

Hipley Street, Old Woking, Surrey, England, GU22 9LQ. UK

Tel: [phone] Fax: [phone] Web Site: www.nittan.co.uk E-mail: [e-mail]

EVC-H CONVENTIONAL HEAT DETECTOR

INSTRUCTION MANUAL

evolution

Quality System Certificate No. 041

Assessed to BS EN ISO 9001:2002

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evolution.....

The EVC-H Heat Detector forms part of a brand new range of fire detectors
from Nittan (UK) Ltd called

evolution.

The EVC-H is an elegantly designed, low profile detector which is
aesthetically pleasing, thus enabling it to blend unobtrusively into modern
working environments.

The EVC-H is compatible with other existing conventional fire detection
systems.

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CONTENTS:-

Section 1 - Introduction - Page 2
Section 2 - Operation - Page 2
Section 3 - Detector Models - Page 3
Section 4 - Base Models - Page 3
Section 5 - Installation - Page 3
Section 6 - Connections - Page 3

Section 7 - Maintenance &

Cleaning - Page 4
Section 8 - Specification - Page 5
Section 9 - EMC - Page 5
Section 10 - Dimensions - Page 5

Section 11 - Response

Characteristics - Page 6

Section 1 - INTRODUCTION

The EVC-H is an attractively styled, fast response, low
profile heat detector.

It has been designed to replace any previous Nittan heat
detector.

EVC-H features:

* Low profile, stylish appearance

* Different response grades available

* Non-polarised terminals

* Unauthorised head removal signal facility

* Low monitoring current

* Patented OMNIVIEWTM 360o LED alarm indicator

* Remote indicator output

* Compatible with STB-4, STB-4SD and STB-4SE
bases

Section 2 - OPERATION

The EVC-H range of heat detectors are non mechanical
and use a thermistor of low thermal mass as the sensing
element giving a fast response. Although these
detectors operate on a fixed temperature threshold only,
their fast response makes them generally suitable for

use where rate-of-rise detectors would be used.

Fig. 1. Block Diagram of EVC-H Detector Circuit

FIG. 1

RECTIFIER

AND

FILTER

OPERATION

INDICATOR

SWITCHING

UNIT

VOLTAGE

STABILISER

+ve
(3)

-ve
(1)

-ve
(6)

SENSING

THERMISTOR

INTERNAL

REFERENCE

COMPARATOR

UNIT

Rem. Ind. (5)