Retrotec DucTester 341 - Manual (Page 4)

Flow at the induced
pressure is the simplest
result.
Flow in CFM per square
foot may be required.
(Enter an area) see below
Flow in CFM per 100
square feet is required
by Code or other pro-
grams.
(Enter an area) see below
Flow reads “--” at test pressure?
If the test pressure has been reached, but “--” appears,
the fan is running too slowly to accurately measure flow.
□
Switch to a lower Range Plug
□
Change [Range] to match
□
Re-adjust fan speed.
Cannot achieve test pressure at full speed?
If fan reaches 100% speed before reaching 25 Pa:
□
Change to a larger Range Plug and try again.
□
Change [Range] on the gauge to match.
□
Check seals on all registers. Look for disconnected
ducts or ducts open to outdoors.
□
Tap [@ Pressure] to get the gauge to calculate
what the flow would be at exactly 25 Pa.
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Get the results you need
□
Tap [Channel B] on the screen to select a
different Result, or tap the [Result to be
displayed] button in the [Settings] menu.
Show leakage area Result
Desired results not achieved?
Equivalent Leakage Area (EqLA) describes the leakage
area in terms of one large hole in a flat surface.
Tap the [Channel B] key, then
, and select
“EqLA: sq in”
[Channel A] shows the duct pressure and
[Channel B] “EqLA” shows the combined size of all
the holes in the ducts.
Leakage area is not a required result, but is a nice way to
visualize the size of the hole in the ducts.
When a Result is chosen that requires an area or volume,
or
will be shown on the Home screen. Tap to change.
The area and volume can also be changed from the
menu.
Field check gauge weekly
Check gauge operation and check for blocked, leaking or
pinched tubes weekly, and anytime results are in question.
To perform the gauge check, you will need the gauge
and Umbilical.
□
Set [Time Average] to 5 seconds in [Settings].
□
Tap [Channel B] and select“Pressure: Pa”.
□
Connect the yellow tube between the red and
yellow ports.
□
Repeat between different ports with each color of
the tube.
If readings on Channel A and Channel B are within
2% and don’t drop rapidly, the tube is not blocked
or leaking and the gauge is correct.
Checking your gauge
and tubes regularly
will eliminate the most
common source of
errors.
22,000