Table of Contents
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1. Application
2. Handling
2.1 Marking
2.2 Weight
2.3 Transport
3. Storage
4. Installation
4.1
Attachment
Prior to duct connection
4.2
Duct connection
4.3
4.4
Wiring
5. Start of operation
5.1 Prior to start of operation
5.2 Starting procedure
6. Maintenance
6.1 Prior to inspection and maintenance
6.2 Fan casing
6.3 Impeller
6.4 Motor
6.5 Belt drive
6.6 Belt pulleys
6.7 Bearing part
6.8 Dismounting of motor for
CNA, CNB/D, CNA-M
and CNB/D-M
6.9 Fault localization
7. Sound
8. Attestation of
conformity
1. Application
Centrifugal fans type CNA, CNB, CNA-
M and CNB-M are light, compact low-
pressure fans, constructed for universal
installation in light industrial plants.
2. Handling
2.1 Marking
The fan is provided with a standard
nameplate with Novenco's name and ad-
dress. It also mentions product type, e. g.
CNA 630 LG and order no.
The motor is also provided with a name-
plate.
MU 15696 0218
Centrifugal fans types CNA, CNB,
CNA-M and CNB-M
installation and maintenance
Fan type
CNA
CNB
Table 1. Total weights incl. motor [kg]
2.2 Weight
The total weights shown in table 1 apply
to CNA, CNB, CNA-M and CNB-M, incl.
the weight of the maximum motor size
which can be mounted on top of the fan
casing (see fig. 1).
a
Figure 1. Placement of the motor
a: Motor on the side (vertical motor plate).
b: Motor on the top (horizontal motor plate)
2.3 Transport
Fan size 250 and 315 are supplied in card-
board boxes. During transit the card-
board box is placed on a pallet or the like.
Size 400-1000 are supplied on pallets or
bearers to allow fork-lift transport.
3. Storage
Fan size 250 and 315 cannot stand out-
door storage in the original packing. Size
400-1000 can stand outdoor storage for 1
month provided the packing is intact.
If the fans are stored indoors under well-
ventilated conditions with no risk of con-
densation the storage period is 6 months.
If the storage period exceeds 3 months it
is recommended to loosen any belt drive
connection and turn the impeller regu-
larly by hand. The storage location must
not be exposed to vibrations likely to
damage the bearings.
4. Installation
4.1 Attachment
The fan can be mounted on any of the
four edges of the casing. However, it
must be noted that fans provided with
motor may not be mounted with larger
motors than stated in table 2.
250
315
400
500
42
75
93
159
-
-
95
168
b
a
Fan size
630
710
800
900
216
378
444
540
231
402
474
575
Max. motor
Fan
Motor on side
size
Motor
Weight
Motor
size
[kg]
90
20
250
112
40
315
112
40
400
132
70
500
132
70
630
132
70
710
132
70
800
132
70
900
132
70
1000
Table 2. Motor sizes and weight
Larger motors are mounted on slide rails
next to the fan or on a common base
frame.
If the motor is mounted on slide rails
next to the fan, the motor shaft, fan shaft
and belt pulleys must be aligned exactly
in relation to each other in order to en-
sure that the belts run correctly in the
grooves of the belt pulleys. The fan
should always be mounted on a solid
and level foundation to prevent defor-
mation of the fan casing. The natural fre-
quency of the foundation must be at least
20% higher than the highest resonating
frequency of the fan.
Fan sizes up to 630 can in certain cases be
mounted on the wall or suspended from
the ceiling. However, it will be necessary
in each individual case to make sure that
the flanges of the fan casing, the mount-
ing bolts etc. are strong enough to sup-
port the current load. If the fan is mount-
ed on the wall, and especially if it is
mounted with horizontal side plates, it
will be necessary to brace the fan by plac-
916505-0
GB
1000
677
725
Motor on top
Weight
size
[kg]
90
20
112
40
112
40
132
70
132
70
160
140
160
140
180
190
180
190
1
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