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Retrotec 451 DucTester User Manual

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Get the results you need

Desired results not achieved?

Field check gauge weekly

Additional troubleshooting

Tap the [Channel B] key to select a different

Result, or tap the [Result to be displayed] key

on the [Settings] menu.

Flow: CFM (m3/h)

-

Flow at the induced pressure is

the simplest result.

Flow/Area: CFM/100 sq ft (m3/(h*m2) or m3/

(s*m2) or liters/(s*m2))

-

Flow in CFM per 100

square feet (or m

3

/(h·m

2

) may be required. Requires an

area to be entered.

When a Result is chosen that requires an area,

[Area] will be shown on the Home screen. Tap it

to enter the area.

The area can also be changed from the

[Settings] menu.

Flow in [Channel B] reads “--” at test pressure?

If the test pressure has been reached, but

“--” appears, the fan is running too slowly to

accurately measure flow.

Cannot achieve test pressure at full speed?

If fan reaches 100% speed before reaching

test pressure:

- Switch to a lower Range Plug

- Change [Range] to match

- Re-adjust fan speed

- Change to a higher 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.

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.

Check gauge operation and check for blocked, leaking

or pinched tubes weekly, and anytime results are in

question. This will eliminate a common source of error.

To perform the gauge check, you will need the

gauge and Umbilical.

Visit www.retrotec.com/support for more support

options such as FAQ, Webinars, Manuals, Tech

Support, and Repairs.

Repeat between different ports with each of the

tubes you use for testing.

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.

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Tap on the gauge and select the range

to match your fan, whenever a Range

Plug is changed.

Use smaller Range number for tighter ducts,

and larger number for leakier ducts.

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