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Step 2:
Connect to ducts cont'd
□
Connect Flex Duct to fan inlet for depressurization.
depressurize
Depressurization is easiest and permitted in all States
except CA & WA where it can still be used to
evaluate, but not for a final result.
To pressurize, connect the Flex Duct to fan exhaust.
All other connections remain the same
pressurize
Step 3:
Connect DM-2 gauge & fan
□
Connect power cord.
□
Switch to on: " l ". Green
light indicates that power
is connected.
□
Connect yellow and green
tubes to matching color
ports on fan. Ethernet
style Speed Control Cable
will disable the knob. It is
connected later in Step 4.
Speed Control Cable
□
Insert blue tube into the
supply register closest to
the air handler.
Total Duct Leakage Test: Depressurize
Ready to conduct the test by depressurizing the ducts:
Exhaust
airflow
Inlet
with Range Rings
inside Flex Duct
Depressurizing works best because the fan pulls the
Grill Mask tight on the registers during the test.
Inlet
Step 4:
□
airflow
□
Exhaust
□
□
□
* 50 Pa for Northwest ENERGY STAR.
□
□
Page 3 of 8
If Pressurizing, see tubing setup on page 7.
Conduct test
Press [On] twice to get to main
screen.
Adjust fan speed knob clockwise
until "PrA" reaches test pressure.
If not possible, go to Step
5 for advice on changing setup.
Connect Speed Control Cable to
fan.
Solid green Status light
indicates DM-2 is ready
to control speed.
For a test pressure of 25 Pa *, press
[Set Pressure] [25] [Enter].
Press [@ Pressure] to display what
the result would be at exactly 25 Pa.
Read results directly from the gauge.
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