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Minimum Damper Position (MDP) Setting
— Setting of the
outdoor air damper position is performed in conjunction with a
shortened version of the field run test. This is performed by
first opening DIP (Dual In-line Package) switch no. 4 then
no. 6. See Fig. 27 and Direct Digital Controls DIP Switch Con-
figuration section on page 63.
The outdoor-air damper closes. The control allows 90 sec-
onds for the damper to close in case it is in the full open
position. Next, the indoor-fan contactor will energize. The
outdoor-air damper will remain at 0% for 30 seconds. It will
then move to the 10% damper motor travel position for another
30 seconds. This will be repeated at every 10% increment for
30 seconds until the damper reaches 100% open. Close DIP
switch no. 4 during the 30 seconds immediately after the de-
sired outdoor air minimum damper position. The 30-second
time period is to allow time where DIP switch no. 4 can be
closed. The default value of the minimum outdoor air damper
position is 20%. If the desired minimum position is 30%, al-
lows the damper position to go to 10% for 30 seconds, then
20% for 30 seconds, and when it reaches 30% close DIP switch
no. 4 during the 30-second period following the 30% position.
The minimum outdoor air damper position is now set. Close
DIP switch no. 6.
HOOD SIDE
MOUNTING
FLANGE
HOOD TOP
HOOD SIDE
CROSS MEMBER
GRAY FOAM STRIP
Fig. 38 — Adding Seal Strip to Sides of Hood Top
Mounting Flange
Fig. 39 — Adding Seal Strip to Back of Hood Top
Mounting Flange
Fig. 40 — Adding Foam Strip to Cross Member
HOOD SIDE
(SLOTTED)
HOOD
TOP
Fig. 41 — Adding Foam Strip to Hood Side
BLOCKOFF BAFFLE
GRAY FOAM STRIP
Fig. 42 — Adding Seal Strip to
Blockoff Baffle