Hochiki FIRElink-400CM - Manual (Page 30)

Page 30 of 58 FIRElink-400 Air Sampling System – Installation Manual
© 2010 Hochiki Europe (UK) Ltd 9-5-0-346/ISS4/OCT10
6 Installation
6.1 General
Before installing the detector the local standards for installation of aspirating detection systems must be
consulted as these standards differ throughout the world. Specific advice for one country may not be
applicable to another. The following is a brief set of guidelines on installing detectors.
 The detector will normally be mounted at a level where there is easy access to the unit for
configuration and programming.
 Unused sampling pipe inlets must be closed. For advice on pipe layout design consult the ‘System
Manual’ and contact the Hochiki Europe (UK) Limited Product Support Department in case of
difficulty (see page 2).
 The exhaust air from the unit must not be impeded in any way. If the unit is mounted in a different
air pressure from where the air is being sampled (for example an air duct), then a pipe must be
taken from the exhaust port back to the same air pressure zone as the sampling holes.
 All signal cables must be screened and must be of a suitable type. The specific type of cable will
normally depend upon the local fire regulations.
 The unit must not be placed in areas where either the temperature or humidity is outside the
specified operating range.
 The unit should not be placed in close proximity to any equipment expected to generate high Radio
Frequency levels (such as radio alarms) or units generating high levels of electrical energy (such
as large electric motors or generators).
 Ensure that when the detector is fitted to the wall there is enough space on the right hand side to
all allow removal and replacement of the filter element. (see section 11 “Maintenance” on page 52).
6.2 Mechanical Installation
The detector body is fitted to a wall-mounting bracket which is attached to the wall via the mounting holes
E as shown below. The detector is then fitted over the mounting stud D and secured inside the detector
body with the nut provided for the purpose.
For a more discreet layout, it is possible to allow the sampling pipes and cables to enter the detector from
the rear (see illustrations below), with the sample pipes and connection cables channelled into the wall.
In order to achieve this, sampling holes
A and B need to be opened up to a diameter of 30mm to take the
sampling pipes (A) and the exhaust pipe (B). The holes C need to be opened up to 25mm diameter in
order to take a suitable threaded metal cable gland to provide adequate RF screening for the connection
cables. These modifications are shown in dotted lines below.
The wall will also need to be suitably prepared to allow the mounting plate to sit flush against the wall.
The sampling and exhaust pipes must also extend out of the wall sufficiently to tightly engage in the pipe
entries on the rear of the detector as shown. A good starting point would be 25mm of pipe extending past
the back plate. If the detector then sits proud of the bracket, the pipe excess can be trimmed back in
small increments until the correct fit is achieved.