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Operation and Maintenance
Envistar Top 04-21
DSET.220501.07.en
Continuous product development may give rise to specification changes without notice.
6.10 Damper (code ETSP-UM, ETSP-TR, ETRL)
• ETSP-UM
Shut-off damper, rotary heat exchanger and counter-flow
exchanger
• ETSP-TR
Commissioning damper, rotary heat exchanger
• ETRL
Return air damper, rotary heat exchanger
00034
Damper ETSP-UM, ETSP-TR and ETSP-UM, ETSP-TR, ETRL
The purpose of the dampers is to regulate the air flow. Faulty function gives rise
to disturbances that may result in serious problems.
- If the outdoor air damper does not open fully, the air flow is reduced.
- If the outdoor air damper leaks, this will result in increased energy use.
- If the outdoor air damper does not close completely when the unit stops, the air
heating coil is likely to freeze.
- If the trim damper for the rotor purging function is not working or is incorrectly
set, it may result in odours from the extract air being transferred to the supply air
via the rotor.
Inspection
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. Check the function of the damper actuator.
2. Check the dampers for tightness when they are closed. If they are not sealed,
adjust the damper actuator to make the dampers tight (does not apply to trim
dampers).
3. Check the sealing strips.
4. If the damper is not working, check that there are no screws penetrating the
drive mechanism/damper blades to interfere with damper function.
