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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.
9. Check the differential pressure across the rotor. The purging sector is
factory-installed, set to the maximum open position. Depending on the
unit’s pressure difference across the rotor, the purging sector may need
adjustment. An incorrect setting may impair the efficiency. Inspection and
adjustment should be carried out as follows:
- Measure and write down the differential pressure between the outdoor air
(P1) and the extract air (P3).
00014
–
+
P2
P1
P4
P3
xx Pa
1
2
1. Purging sector
2. Pa, see table below
- Read the recommended setting (adjustment hole in the purging sector) from
the table below.
Rotor
variant
Adjustment hole in the purging sector
3
open*
2
intermediate
position
1
closed
Diff. pressure
between P1 and
P3 (Pa)
R20, R30,
R40, NO,
NE
< 300
> 300
–
R50, R60,
NP, NX
< 400
> 400
-
*
maximum open purging sector, preset position from the factory
- Adjust the purging sector if the need arises. The illustration shows the
purging sector set to the maximum open position.