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1. Remove 9 screws holding each damper assembly in
place. See Fig. 37. Each damper assembly is secured with
3 screws on each side and 3 screws along the bottom.
Save screws.
Be careful when tilting blower assembly. Hoods and blow-
ers are heavy and can cause injury if dropped.
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 transducer) is locat-
ed behind the filter access door on the lower inner panel. See
Fig. 38. A section of field-supplied
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
supply duct. Remove plug button in panel to route tubing.
BUILDING PRESSURE TRANSDUCER — The building
pressure transducer (modulating power exhaust pressure trans-
ducer) is located behind the filter access door on the lower
inner panel. See Fig. 38. A section of field-supplied
plastic tubing must be run from the high pressure tap on the
differential pressure switch to the conditioned space. The pres-
sure tube must be terminated in the conditioned space where a
constant pressure is required. This location is usually in an en-
trance 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.
NOTES:
1. Unless otherwise specified, all dimensions are to outside of part.
2. Dimensions are in inches.
3. On 50AW,AY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork.
Fig. 37 — Barometric Relief Damper and Power Exhaust Mounting Details
1
/
-in. plastic tubing must
4
2
/
of the way out on the main
3
1
/
-in.
4
Step 10 — Install All Accessories —
factory-installed options have been adjusted, install all field-
installed accessories. Refer to the accessory installation instruc-
tions included with each accessory.
The 50A series units have a large number of factory-
installed options which were previously available only as
accessories. Some of the available options can also be installed
in the field if needed. In most cases the units have been
pre-wired so that the accessories can be easily installed.
Instructions are shipped with each accessory. Configuration of
the controls for these accessories as well as the factory-
installed options can be found in the Controls, Start-up, Opera-
tion, Service and Troubleshooting book. The following is a list
of some of the common accessories:
• Thermostats and Space Temperature Sensors
• Accessory Barometric Relief Damper
• Accessory Power Exhaust
• Non-Modulating to Modulating Power Exhaust
• Condenser Coil Hail Guards
• Motormaster® V Low Ambient Head Pressure Control
AUXILIARY
PRESSURE TRANSDUCERS
CONTROL PANEL
(INSIDE OF PANEL)
LEGEND
VAV — Variable Air Volume
Fig. 38 — Pressure Transducer Locations
(50AJ,AK,AW,AY060)
45
After all the
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