NOVENCO ZERAX AZL-AZN-AZW, Руководство по установке и обслуживанию

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Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance 14 of 30
2188.88 to convert from m
3
/s to CFM.
For the fan types AZN and AZW with wire guards, the constant in table 3 must be reduced by
up to 10%. For these fan types without wire guards, the constant is used directly.
For the AZL with wire guards, the constant must be reduced by up to 20%. For this fan type
without wire guards, the constant must be reduced by 10%.
Free inlet cones are integrated on the AZL and is an accessory for the AZN and AZW.
The suction must be directly from the suction chamber.
Fans with low blade angles can make noise at high pressures, which affects the measurement.
Operation close to the stalling area produces poor results also.
6. Maintenance
In the following, please also see “Appendix - G. Checklists ” on page 29.
Figure 10. Measurement of pressure
difference
q =
q : Air volume [m
3
/s]
k : A constant, see table 3.
dps
:
Difference between p
away
and p
fan
[Pa]
p
fan
: Static pressure at fan inlet [Pa]
p
away
: Static pressure away from fan [Pa]
paway
pfan
k dps

Fan sizes Constant, k Fan sizes Constant, k
250/160 0.0510 900/350 0.7204
280/160 0.0694 1000/350 0.9001
315/160 0.0917 1120/350 1.2019
355/160 0.1183 1250/350 1.5636
400/160 0.1502 1000/560 0.871
450/160 0.1894 1120/560 1.129
500/160 0.2343 1250/560 1.441
500/350 0.1921 1400/560 1.844
560/350 0.2537 1600/560 2.453
630/350 0.3324 1800/560 3.142
710/350 0.4329 2000/560 3.913
800/350 0.5603
Table 3. Constants for calculation of air
volumes for ZerAx fans
Test and
inspection
1
1.The site operator may have set other test intervals. Smoke control fans and other fans, which run infrequently
or in case of emergencies, must be run tested every week, for example during normal operation.
Service and
lubrication
2
2.The motor manufacturer’s recommendations may call for shorter lubrication intervals. See section “6.6 Motors”
on page 16. Please note that fans with permanent magnet motors are lubricated for life.
Cleaning 3
3.Intervals for cleaning depend on the operating conditions and environment. See section “6.2 Cleaning” on page
15.
Bearings
Fan types Bearing types
Standard temperature Sealed for life
6 months
6 months 3 months 3 months
Lubricated
Smoke —
6 months
ATEX and EX —
Table 4. Maintenance intervals