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Fig. 34 —
Flange and Mounting Angle
Pointing Down
Fig. 35 —
Bottom Filters Installed with Flange
Pointing Down
Fig. 36 —
Bottom Filters Installed with Flange
Pointing Down
Fig. 37 —
Attaching Seal Strip to Filter Cover
Fig. 38 —
Filters and Filter Cover
Step 8 — Position Power Exhaust/Barometric
Relief Damper Hood
All units are shipped with the hoods folded inside the unit in a
shipping position. For 50A2,A3,A6,A7 units the hood must be
tilted out once the unit is installed. On 50A4,A5,A8,A9 units
(designed for horizontal supply and return), the assemblies will
have to be relocated to return ductwork. See Fig. 39 for dimen
-
sions and details.
All electrical connections have been made and adjusted at the fac
-
tory. The power exhaust blowers and barometric relief dampers
are shipped assembled and tilted back into the unit for shipping.
Brackets and extra screws are shipped in shrink wrap around the
dampers. If ordered, each unit will have 4 (50A020-050 units) or 6
(50A060 units) power exhaust blowers and motors or barometric
relief dampers.
1. Remove 9 screws holding each damper assembly in place.
See Fig. 40. Each damper assembly is secured with 3 screws
on each side and 3 screws along the bottom. Save screws.
2. Pivot each damper assembly outward until edges of damper
assembly rest against inside wall of unit.
3. Secure each damper assembly to unit with 6 screws across
top (3 screws provided) and bottom (3 screws from Step 1) of
damper.
4. With screws saved from Step 1, install brackets on each side
of damper assembly.
5. Remove tape from damper blades.
Step 9 — Route Static Pressure Sensors
VAV DUCT PRESSURE TRANSDUCER
The VAV duct pressure transducer (VAV inverter pressure trans
-
ducer) is located behind the filter access door on the lower inner
panel. See Fig. 41. A section of field-supplied
1
/
4
-in. plastic tubing
must be run from the high pressure tap on the differential pressure
switch and connected to a field-supplied tap in the supply-air duct.
The tap is usually located
2
/
3
of the way out on the main supply
duct. Remove plug button in panel to route tubing.
BUILDING PRESSURE TRANSDUCER
The building pressure transducer (modulating power exhaust pres
-
sure transducer) is located behind the filter access door on the low
-
er inner panel. See Fig. 41. A section of field-supplied
1
/
4
-in. plas
-
tic tubing must be run from the high-pressure tap on the differen
-
tial pressure switch to the conditioned space. The pressure tube
must be terminated in the conditioned space where a constant
pressure is required. This location is usually in an entrance lobby
so that the building exterior doors will open and close properly.
Remove plug button in panel to route tubing.
The low pressure tap is factory-routed to the atmosphere. For a
positive-pressure building, route the high tap to building air and
low tap to atmosphere. For a negative-pressure building, route the
high tap to atmosphere and the low tap to building air.
FILTER TRACK
MOUNTING ANGLE
SPEED
CLIPS
FLANGE
POINTING
DOWN
MOUNTING
ANGLE
48-1110f
BLACK SEAL STRIP
(CENTERED)
FILTER COVER
CAUTION
Be careful when tilting blower assembly. Hoods and blowers
are heavy and can cause injury if dropped.
FILTER
COVER
FILTERS