Retrotec DucTester with DM-2 Manuel d'utilisateur télécharger pdf (Page 4)

Flow at the induced pressure is the

simplest result.

Mode = “Flow”

Units = “CFM”

Flow per ft

(sq ft) is required in some

states, such as WA.

Mode = “Flow/Area”

Units = “CFM/ft

”

(enter a value for Area)

Flow per 100 ft

is required for the

following states:

Mode = “Flow/Area”

Units = “CFM/100 ft

”

(enter a value for Area)

Flow reads “TOO LOW” or “----” at test pressure?

If the test pressure has been reached, but

“TOO LOW” or “----” appears, the fan is running too

slowly to measure ow.

□ Add the next Low-Range Ring.

□ Change [Range Cong] on the DM-2 to match.

□ Re-adjust speed.

Cannot achieve test pressure at full speed?

If fan reaches 100% speed before reaching the target

pressure:

□ Remove a Range Ring and try again.

□ Change [Range Cong] on the DM-2 to match.

□ Check seals on all registers. Look for disconnected

ducts or ducts open to outdoors.

□ Press [@ Pressure] to get the gauge to calculate

what the ow would be at exactly 25 Pa.

Page 4 of 8

Get the results you need

□ Press [Mode] until required results appear

Show results as leakage area

Equivalent Leakage Area (EqLA) describes the leakage

area in terms of one large hole in a at surface.

□ Press [Mode] until “EqLA” appears.

“PrA” displays the duct pressure and “EqLA” shows

the combined size of all the holes in the ducts.

Step 5: Desired results not achieved?

620 CFM is the ow rate that would occur at 25 Pa,

even though only 22 Pa was achieved.

Use “Jog” to activate arrow keys

[▲] [▼]

then adjust target speed or pressure.

Use “Hold” to freeze results display

and hold fan speed.

□ Press [Jog/Hold] until “Hold” appears in top center

of display.

□ Press [Jog/Hold] again to cancel “Hold”.

□ Press [Jog/Hold] until “Jog” appears.

□ The [▲] [▼] keys now adjust the speed just like a

TV remote. With [Set Speed] the % speed

changes. With [Set Pressure] the pressure changes.

Hold display and Jog speed

Leakage area is not a required result, but is a nice

way to visualize the size of the hole in the ducts.

□ Press [Enter] numbers [Enter] to

input the oor area if CFM/ft

CFM/100 ft

is used.

*Floor area of 2000 square feet

was entered in the above examples.

[Enter] [2000] [Enter]

“Jog” is only available when [Set Pressure] or

[Set Speed] have a value entered.

The display will be frozen with the current values.

□ Press [Setup] for menu to change result units

□ Press [▼] to nd “Mode Setup”, then [Enter]

□ Press [▼] until the Mode you want is highlighted

□ Press [Enter] to change displayed result units

□ Press [Exit] twice to return to main menu

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Retrotec DucTester with DM-2 Manuel d'utilisateur Page 4

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