Retrotec DucTester 350 User manual

QG351 Page 1 of 4 rev-2014-05-13
351/352 DucTester QuickGuide
DM32 gauge
(Battery included)
Gauge case
DucTester
Umbilical
Battery Charger
Tubing
Accessory Kit
Unpack, connect gauge
Check boxes for each step.
□Remove everything from the case.
□Press on the gauge, then tap the
screen, and check the battery state
indicator at the top right:
□If the battery display is not green, connect
USB to power outlet to charge the gauge.
□Connect yellow, green and blue tubes
to the gauge. Gauge remains connected
like this for all tests.
www.retrotec.com Support: [phone] Internaonal: [phone] Made in Everson, WA, USA
QuickGuides
Extra
tubing
Range Plugs

Make sure DucTester 350 is showing on the
Home screen.
If not, tap the fan picture, then
Tap , tap DucTester 350, then select the
range that you have installed.
Tap on [Channel B] to change the type of result
or units. Select based on “Get the results you
need” on page 4.
Tap [Settings] then [Time averaging] and
select 5 seconds.
Tap [Settings] then .
Make sure the [Default @ Pressure] is 80, 160,
or 250 Pa, depending on the test pressure you
need. Make sure “n” value is set to 0.60 for Ducts.
Tap to return to the Home screen.
Step 1: Prepare ducts and house
□Seal all supply and return grills/registers, including
any exterior air inlets, with Grill Mask or tape.
□Open all interior doors leading to rooms containing
a supply or return register, and open an exterior door
or window.
□Shut off all HVAC (A/C, furnaces).
Page 2 of 4
Step 2: Connect to ducts
□Turn off air-handler
and remove all lters.
□ Attach Flex Duct to
register.
□Install Range Plug 74 to start,
as most systems can be tested
on this Range Conguration.
3 7 11 18
29 47 74
□Tap on the gauge and select
the range to match your fan, whenever
a Range Plug is changed.
Prepare the gauge
Use smaller Range number for tighter ducts, and
larger number for leakier ducts.

□ Go to Home screen on the gauge.
□ Adjust fan speed knob clockwise
until [Channel A] reaches test pressure.
□ If you cannot achieve the test pressure,
go to Step 5.
□ Connect Speed Control Cable to your
fan.
□ For a test pressure of
80 Pa, tap
□ Enter 80, tap [Set]
□ Tap
to display what the
result would be at
exactly 80 Pa.
Page 3 of 4
Step 3: Connect gauge & fan
□Insert blue tube into the
duct
□ Read results directly from the gauge.
Speed Control Cable
□Connect power cord.
□Connect yellow and green
tubes to matching color
ports on fan. Plugging in
the Speed Control Cable
will disable the knob. It is
connected later in Step 4.
□Connect Flex Duct Adapter to fan inlet for
depressurization.
Ready to conduct the test by depressurizing the ducts:
Step 2: Connect to ducts (cont’d) Total Duct Leakage Test: Depressurize
Step 4: Conduct test
To pressurize, connect the Flex Duct Adapter to fan
exhaust. All other connections remain the same.
pressurize
Inlet
airow
Exhaust
Inlet
with Range Plugs
inside the Adapter
Exhaust
depressurize
Solid green Status light
indicates gauge is ready to
control the speed.
airow
-80

Flow at the induced
pressure is the simplest
result.
Flow in cubic meters
per hour per square
meter (m3/(h·m2) may
be required.
(Enter an area)
Flow in cubic meters
per second per square
meter (m3/(s·m2) may
also be required.
(Enter an area)
Flow reads “--” at test pressure?
If the test pressure has been reached, but “--” appears,
the fan is running too slowly to accurately measure ow.
□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 80 Pa:
□ 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.
□Tap [@ Pressure] to get the gauge to calculate
what the ow would be at exactly 80 Pa.
Page 4 of 4
Get the results you need
□ Tap the [Channel B] key to select a different
Result, or tap the [Result to be displayed] key
on the [Settings] menu.
Show leakage area Result
Step 5: 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: cm”
[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.
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 of the
tubes you use for testing.
Field check gauge weekly
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 a common
source of error in
readings.