035-000029-001
Page 32
HHA IOM 1.4 10/11/2021
INSTALLATION—FACTORY OPTIONS
Final (HEPA) Filter APD Gauge Option—
See Figure 14. Units provided with the final
filter APD gauge option have tubing routed
internally from static pressure ports across
the HEPA filter. The static ports (see Figure
15) allow the gauge to measure the air pres-
sure drop (APD) across the HEPA filter.
Can be used with final filter with non-HEPA
efficiency rating.
Gauge span is 0-4.0in w.g. Typical clean
HEPA filter APD is approximately 0.7in w.g.,
and typical fully loaded APD is approximate-
ly 1.7in w.g. These will vary with the actual
airflow. Refer to APD table for actual val-
ues.
The APD gauge is attached from the outside
and can be serviced by removing the cover
panel (8 screws) and then removing the
gauge mounting screws and lugs.
NOTE:
The pressure tap tubing is inter-
nally routed from the pressure taps and
cannot be removed or re-routed. It is
acceptable to remove the gauge and
replace with field-provided gauge or oth-
er devices, and to connect these to the
factory tubing.
Fig. 14 — HEPA (Final) Filter
APD Gauge
FINAL
FILTER
ACCESS
DOOR
GAUGE COVER
REMOVED
STATIC PRESSURE
TUBING (FACTORY)
GAUGE
COVER
DIFFERENTIAL
PRESSURE
GAUGE
Fig. 15 — HEPA (Final) Filter
APD Static Taps
HEPA FILTER
NOT SHOWN
FOR CLARITY
STATIC
PRESSURE
TAPS
Содержание HHA Series
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Страница 24: ...035 000029 001 Page 24 HHA IOM 1 4 10 11 2021 Service Clearances Arrangement B No integral Final Filter...
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Страница 57: ...035 000029 001 Page 57 HHA IOM 1 4 10 11 2021 B...
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