Page 54
Operation and Maintenance
Envistar Top 04-21
DSET.220501.07.en
Continuous product development may give rise to specification changes without notice.
00022
2
1
3
5
6
7
4
Example fan unit size 09-21
1. Screws side cover
2. Pins
3. Anti-vibration mounting
4. Earth braid
5. Motor
6. Fan impeller
7. Side cover
WARNING!
Risk of serious personal injury and/or damage to air handling
unit.
Read and understand the entire chapter "1.5 General safety
messages" before working on, servicing, or inspecting the air
handling unit.
1. Remove one end of the fan assembly’s earth braid. If necessary, split the
motor cable's quick connector.
For size 04-06
: Remove the screws (1) in the connection plate (2) and un-
hook the fan unit from the key holes in the anti-vibration supports (5), both
upper and lower.
For size 09-21
: Loosen the screws (1) and the pins (2). Remove the side
cover (6). Pull out the fan units (fan and motor are mounted on slide rails).
2. Check that the fan impeller rotates easily, is in balance and does not vibrate.
Also check that the fan impeller is clean from any accumulation of particles.
Imbalance may be due to a coating or damage to the fan impeller blades.
3. Listen to the sound from the motor bearings. If the bearings are in good
condition, you will hear a slight purring sound. A scraping or pounding sound
may mean that the bearings are damaged and service is then required.
4.
For size 04-06
: Check that the fan impeller with motor (6) is firmly mounted
in the upper fan support (8) and that it has not shifted sideways toward the
inlet cone (3). Also check to make sure that the inlet cone is properly se-
cured. Check that the anti-vibration mountings (4) are intact and are firmly
fitted.
