Boreas Technologies Air Handling Unit - Maintenance; Table 5 Vibration Reference Values

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Installation
Machine
Group
Good
Acceptable
Not Permissible
Fixed, < 15 kW
K
0.7 mm/s
1.8 mm/s
4.5 mm/s
Fixed, ≥ 15 kW
M
1.1 mm/s
2.8 mm/s
7.1 mm/s
With Vibration Insulation
T
2.8 mm/s
7.1 mm/s
18 mm/s
Table 5 Vibration Reference Values
7.1.2 Maintenance
Maintenance should be carried out on fans at every four months. Cleaning agents in the pH range of 7-9
should be used.
WARNING: PLUG FAN SYSTEMS MUST BE USED WITH THE FREQUENCY INVENTER FOR
CONTROL OF THE MOTOR’S FREQUENCY
Periodical Maintenance on Fans:
• Check whether fans conform to hygiene standards, and check for accumulated dust,
corrosion, and damages.
• Check the balance of fans and the connections of fan blades.
• Check for mechanical friction sounds or oscillation on fan and motor bearings.
• Check the connections of vibration attenuators. Also check whether the fan complex is
balanced according to its centre of mass on vibration attenuators.
• Check the clearance between the fan impeller and funnel. (Figure 21)
• Check the leads of pressure sensors in the fan section.
• Check for tears in the flexible connector.
• Check for deflection in the fan motor base system.
Required Maintenance on Fans:
• Replace fan bearings when their useful life has expired.
• Lubricate fan bearings at intervals determined by the manufacturer.