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Step 12 — Install All Accessories — After all the
factory-installed options have been adjusted, install all field-in-
stalled accessories. Refer to the accessory installation instruc-
tions included with each accessory.
MOTORMASTER® III CONTROL INSTALLATION
Install Field-Fabricated Wind Baffles
— Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low-ambient temperatures. See Fig. 52 for baffle
details. Use 20-gage, galvanized sheet metal, or similar corro-
sion-resistant metal for baffles. Use field-supplied screws to at-
tach baffles to unit. Screws should be
1/
4
-in. diameter and
5/
8
-in.
long. Holes for wind baffles are pre-punched in the unit sheet
metal.
The wind baffles attach to flanges formed on the outer sheet
metal of the unit corner post. The other end of the baffle is at-
tached to the center panel between the condenser coil and the
indoor section. Two baffles are required.
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only.
NOTES:
1. Unless otherwise specified, all dimensions are to outside of part.
2. Dimensions are in inches.
3. On 48AW,AY and 48EW,EY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork.
Fig. 50 — Barometric Relief Damper and Power Exhaust Mounting Details
LEGEND
VAV — Variable Air Volume
Fig. 51 — Pressure Transducer Locations
(48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068)