Operating and Maintenance Manual - Air Conditioning Division
Make sure that the fan is always accompanied
by this manual.
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be consulted to identify the suitability of the plenum fan for the fluid treated by the
system.
The TE impeller is manufactured in glass reinforced polyamide.
The NPL
ALU
and NPA
ALU
impellers are manufactured in aluminium. The lower weight means less
load on the bearings (longer bearing-life), lower extra-load added on the structures concerned by
installation, also contributing to a reduction on self-induced vibrations. The aluminium alloy used
has excellent resistance to corrosion and is non-toxic, non-magnetic and easy to clean.
Comefri impellers for plenum can be provided as a kit consisting of impeller and inlet-
cone or according to the settings summarized in the Appendix.
Standard setting provided by Comefri is setting 4 which must be installed with horizontal shaft.
Comefri impellers can be completed with a wide range of accessories, according to application
and installation requirements. The range of accessories is also completed by protection fittings
for the inlet-cone and for settings 4 in conformity with UNI EN ISO 13857, available on demand.
Comefri declines all liability for any damage to persons or objects caused by absence of safety
devices or by the use of devices not provided by Comefri. Particular attention must be paid
in case of direct contact with rotating parts: plenum fans do not meet the provisions of the CE
labelling (e.g. they have an impeller without guards). The plenum fan must nevertheless be
installed in accordance with CE requirements.
Plenum fans in ATEX execution provided by factory with all safety devices meet the CE
labelling.
Particular attention must be paid in case of direct contact with rotating parts. If this is the
case, the use of specific and adequate personal protective measures (PPE) is essential.
2.3 Technical data
The technical data and the permissible limits are clearly listed on the fan and plenum fan
label. They can be taken from the appropriate technical catalogue. It is absolutely
forbidden to exceed the machine limits.
For some fans, a part of the catalogue curve is drawn as a dashed line to warn that the
use of the fan in these conditions could generate instability and vibrations due to the
presence of inlet obstructions (like pulley, etc). (For spark-proof execution, see par. 4.5).
For particular executions not foreseen in the catalogue, please contact Comefri.
Noise has been measured according to ISO, DIN, UNI and ANSI-AMCA standards, by means of
a frequency analyzer in real time.
See the appropriate technical catalogue for sound power levels, determined according to
standards DIN 45635 Part38 / ISO 5136 / ANSI-AMCA 330 for in-duct method and according to
ANSI-AMCA 300 for reverberant room method. Values detected by the final user can be
different from those detected during testing since they are affected by specific installation and
environmental and structural factors near the fan or plenum fan and system.
2.4 Applications
The fans and plenum fans are intended to move dust-free air or slightly dusty air. They are not
suitable for aggressive gases, vapours or dusty air. Improper use may cause damage to the
bearings, corrosion, unbalancing of the impeller and vibrations.
The features of each product series are specified in the technical catalogue that must be
consulted to identify the suitability of the fan or plenum fan for the fluid treated by the
system.
Permissible operational temperature range for all fans: -20 °C to +60 °C.
Permissible operational temperature range for impellers of plenum fans (except TE) : -20 °C
to +85 °C; operational temperature range for TE impellers : -20 °C to +60 °C.
For temperatures outside of this range, kindly contact us in order to define the most appropriate
execution.
The maximum ambient temperature of the standard motor is + 40°C.
Consequently plenum fan wheels in all settings where motor is in the flow of the conveyed fluid,
due to temperature limit of motor, operational temperature range is from –20°C to +40°C
according to the motor model and brand.
2.5 Fans and Plenum Fans with spark-proof execution according to ATEX
94/9/EC
The special TZAF FF Atex, VTZ Atex, NTHZ Atex, THLZ FF Atex, MAZ Atex, MHZ Atex, TLZ
Atex, TLI Atex, TZAF Atex, THLZ Atex, HLZ Atex, TLE Atex, THLE Atex, KHLE Atex, NPL Atex,
NPA Atex, TE (in steel ) Atex executions are available for spark-proof applications according to
the ATEX Directive 94/9/EC Group II Category 3G.
TZAF FF Atex, NTHZ Atex, MAZ Atex, MHZ Atex, NPL Atex and NPA Atex are Atex certified to
be used in Group II Category 2G.
THLZ FF and TE series with standard polyamide impellers cannot be in Atex execution; they
can be in Atex execution ONLY with special steel impellers (see par. 2.5.3.1).
Plenum fan series NPL
ALU
and NPA
ALU
which are with aluminium wheel cannot be in Atex
execution (see par. 2.5.3.1).
2.5.1 Applications
Fan and plenum fan operating in areas with combustible gases, vapors, mist, dust and fumes or
with a possible danger of explosion must adhere to explosion-proof guidelines. From July 1,
2003 it is necessary for fans and plenum fans intended for use in potentially explosive
atmospheres to comply with the ATEX Directive 94/9/EC.
The ATEX Directive identifies two groups of fan and plenum fan equipment.
Group I: fan and plenum fan equipment intended for use in mining applications (Out of Comefri
production)
Group II: intended for all other situations.
Fans and plenum fans in Group II are divided into three categories, depending on whether
explosion-proof safety has to be assured only under normal operation (Category 3) or also
when malfunctioning or faults occur (Categories 2 and 1).
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