Technical data

EM RANGE GAS FIRED
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the EM unit and any other plant reliant upon the
supply.
Service pipe work must terminate at an
approved gas cock, and be adjacent to the
position of the appliance. The connection to the
EM unit can be made by way of either an
approved flexible coupling, or rigid connection.
Threaded connections must comply with ISO
228/1 or ISO 7/1. The diameter of the pipe work
from the cock to the burner connection must not
be less than the diameter of the burner
connection inlet.
The installation must be purged and tested for
soundness prior to commissioning in accordance
with the current approved methods.
Caution
Excess gas pressure can damage the control
valves within the gas train. Insufficient gas
pressure can cause nuisance burner lockouts.
The gas supply at the inlet to the gas train
should be set at 22.5 millibar.
3,6 Electrical Installation
Reference should be made to the wiring
diagram(s) contained later in this manual prior
to installation or connection to the electrical
supply.
Note
The wiring diagram number can be found on
the data plate
The electrical supply must be as specified and
suitable for the EM unit, and must be run within
conduit to a point adjacent to the EM unit, and
be terminated to provide an isolation point that
will prevent remote or inadvertent use. All EM
units are supplied fused and pre-wired, all must
be earthed. Final connections for the air
handling unit and external controls must be
completed on site, and must be carried out
according to the appropriate regulations.
On EM units fitted with High-low or modulating
burners it is a requirement that the high flame
and modulating flame signal cables are
sufficiently protected and screened so as to
prevent any external influence associated with
induced voltages etc.
Separate user information is provided for the
burner, and forms part of the product
information pack which accompanies every EM
unit when despatched.
Warning
Always isolate from mains electrical supply
before commencing work on the EM unit.
3,9 EM unit Control Installation
All EM units are manufactured with the fan and
limit thermostat, air pressure switch, and burner
pre-wired and installed. It is the responsibility of
the installer to make the appropriate
connections, and to supply and install suitable
ancillary controls to ensure that the unit
performs satisfactorily, for example, room
thermostat, time clock, building management
systems, process management systems etc,.
Warning
Ancillary controls must not be wired so that
they may override any of the safety controls or
safety devices.
Caution
It is the responsibility of other suppliers to
ensure that thermostat/sensor positioning and
the controls package in general, allows for
satisfactory operation of the EM unit. Room
thermostats must be positioned so as not to be
directly within the airflow from the appliance,
nor should the thermostats be positioned so that
they are subject to elevated temperatures
associated with strong or direct sunlight. Ideally
the thermostats should be positioned so that they
are approximately 1.6m above floor level within
the area to be heated by the EM unit.
4,0 Commissioning
The air delivery system must have already been
fully commissioned and balanced prior to the
commissioning of the EM unit, thereby ensuring
that required air flow characteristics are in
accordance with those recommended for the EM
unit.
Warning
The maximum and minimum air volumes
detailed as follows must be adhered to.
Airflow Volumes (m
3
/s) min max
EM60 0.9 1.7
EM88 1.2 2.3
EM117 2.2 3.5
EM150 2.4 4.5
EM175 2.4 5.3
EM235 3.0 7.0
EM301 3.2 7.7
EM375 6.0 11.2
EM440 7.0 12.5
EM525 8.0 15.8
EM600 9.5 17.0
EM700 11.3 18.9
Caution
The air delivery system must have been fully
commissioned and balanced before the EM unit