17
Air Handling Units
Operating Checks
The service life of the bearing lubricant can be shorter than
the service life of the bearings. Bearings mounted in rub-
ber silent blocks or in casings without lubricating nipples
are not intended to be additionally lubricated. Bearings
equipped with lubricating nipples are used with fans inten-
ded for heavier duty operation and working conditions.
Regular lubrication of the bearings is essential to reach the
bearings' service life. Only bearings of ADH/RDH "K" and
"K1, K2" fans need to be lubricated.
Lubricating Bearings
There are many factors influencing the lubricating interval
of fan bearings - bearing type and size, working speed,
ambient temperature, diameters of pulleys, installed input,
type of lubricant and working environment. Therefore,
information based only on statistics can be provided.
For normal operating conditions, it is recommended to lub-
ricate the fan bearing at least once a year. If the operating
temperature exceeds 50 °C, this time period must then be
reduced by a half for each 15 °C above this threshold.
For ADH/RDH K, K1 fans, it is necessary to refill the lubri
-
cant until it comes out.
Figure 28 –
Lubricant types
ADH/RDH
560
630
710-800 900-100
amount of
lubricant
30g
30g
35g
15g
For additional lubrication, we recommend for example the
following lithium-type lubricants:
Manufacturer Lubricant type
FINA
MARSON HTL 3
SHELL
ALVANIA FeH3
ESSO
BEACON 3
MOBIL
MOBILUX 3
SKF
LGMT2/S
Table 5
– recommended amount of lubricant
Inspection of dampers
Check the dampers for cleanliness.
Check the damper flaps for free rotation.
Check the damper flaps for full closing.
Filter Inspection and Replacement
Check the filters for condition and fouling
(if fouled, the filter inserts must be replaced).
The used filter inserts must be disposed of
in an ecological way.
Check the sealing for integrity.
Check the mounting of filter walls and inserts.
Check the settings of differential pressure sensors
Table 7
– Max. (designed) pressure loss
Table 6
– Recommended final pressure loss
Filtration class/
standard
EN13053:2006 E
G3, G4
150 Pa
M5, M6, F7
200 Pa
F8–F9
300 Pa
xx … filtration class, yy … AeroMaster Cirrus unit size
Filtration
class/Filter
Bag
(
CR
VF
Ayy)
Compact
(
CR
VFByy)
Frame
(
CR
VFCyy)
Insert
(
CR
VFDyy)
Metal
(
CR
VFEyy)
Grease
(
CR
VFFyy)
G3, G4
250 Pa
300 Pa 300 Pa 150 Pa 150 Pa
M5
400 Pa
–
300 Pa
–
–
–
M6–F9
400 Pa 450 Pa
–
Spare kit
(code)
CRNA0-yyxx
CRNB0-yyxx
CRNC0-yyxx
CRND0-yy03
CRNE0-yy03
CRNF0-yy03