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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.
For units (code TER/TXR), the pressure balance must be ensured by check-
ing that the under pressure P3 is greater than the pressure P2 (min. diff 25
Pa). Otherwise an ETSP-TR trim damper can be used on the extract air side
in order to throttle in the correct pressure balance.
Example:
Measurement outlets for P2: Downstream supply air fan (SF) generates
negative pressure in relation to the atmospheric pressure (atm), e.g. -100 Pa
Measurement outlets for P3: Downstream extract air fan (EF) and any trim
damper generate greater negative pressure than at P2, e.g. -125 Pa.
00015
–
+
25 Pa
P3
P2
-100
Pa
-125
Pa
P1
P4
P ≈ 1 atm
(101 kPa)
1
Measurement outlets for pressure balance – unit with control equipment (code MX)
1. Trim damper
00017
–
+
–
+
25 Pa
P3
P2
-100
Pa
-125
Pa
P1
P4
P
≈
1 atm
(101 kPa)
–
+
1
Measurement outlets for pressure balance – unit without control equipment (code UC, MK, US)
1. Trim damper
