Retrotec Triple Fan Blower Door System Setup with DM-2 - Manual (Page 5)

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20 Remove fan cover and set range
20.1 Remove the fan covers from
all three fans.
20.2 All three fans should be open,
with all range plates
removed.
20.3 Press [Range Config] on
DM-2 #1 only, until “Open” is
displayed.
See: QuickGuide-Fan-RangeConfig-2000&3000
21 Set speed manually
21.1 On DM-2 #1 (connected to the splitter
box), press [Set Speed] [10-100] [Enter] to set
any speed from 10 to 100%.
Tip Press [Exit] or set the speed to zero to turn the fans off.
21.2 Press [Jog/Hold] until “Jog” appears. This
enables manual fan speed adjustment.
21.3 Use [  ] [  ] to adjust the fan speed up or down.
Tip Click once to change speed by 1%, hold button to
increment by 5%.
21.4 All three fans should run at the same speed.
21.5 Adjust the fans’ speed to achieve the lowest
required test pressure. Check to see if the flow
can be measured on Channel B of DM-2 #1.
21.6 Adjust the fans’ speed to achieve the highest
required test pressure.
“TOO LOW” is displayed
Press [Mode], on DM-2 #1, to display “Flow”. If PrA has
been reached, but “TOO LOW” appears, the fans are
running too slowly to measure flow.
1. Press [Exit] to stop the fans.
2. Remove one fan and install a blanking plate in
the panel.
3. Restart the fans and try again.
Note The displayed flow is the flow for Fan #1 only. It is not the
reading of the combined flow for all three fans.
22 Set pressure automatically
22.1 Press [Set Pressure] [10-90] [Enter]. The DM-2
will control the fans to achieve the set pressure.
Example: Press [Set Pressure] [50] [Enter] to instruct
the DM-2 to attempt to achieve 50Pa building pressure.
22.2 The DM-2 will automatically adjust the fan speed
until the desired pressure is achieved.
Tip Click once to change pressure by 5 Pa, hold to increment
by 10 Pa.
Tip Press [Exit] to turn the fans off and cancel the “set
pressure”.
23 Pressurization testing (optional)
23.1 Remove the fans from the door and install them so
that they are blowing into the building.
23.2 Repeat procedure from Step 15.
24 Field gauge check recommended weekly
24.1 Insert a T in the yellow
tube.
24.2 Connect the red and
yellow ports to the T.
24.3 Increase the fan speed
and compare PrA and
PrB.
24.4 Disconnect tubes from yellow and red ports and
connect them to green and blue ports.
24.5 Repeat the test.
24.6 Values should be within 1% of each other.
24.7 Repeat the test for the second DM-2.