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Step 10 — Make Outdoor-Air Inlet Adjustments
ECONOMIZER
NOTE: If accessory power exhaust or barometric relief pack-
ages are being added to the unit, install power exhaust or baro-
metric relief before installing economizer hoods.
Economizer Hood Assembly
— The economizer hood is
shipped in a package secured to the outside of the unit, behind
the indoor access panel. The hood assemblies must be field-
assembled. The 48AW,AY and 48EW,EY units are side supply
and side return. The return duct limits access to economizer fil-
ters from below. Filter tracks (mounting angle without tabs)
must be installed correctly to allow access to economizer filters
from each side.
The 48AJ,AK,AW,AY020-050 and 48EJ,EK,EW,EY024-
048 units have two hoods on every unit. Each hood has two
lower filter tracks, one slotted side and one side without slots.
Construct the assembly so that the slotted side is adjacent to the
other hood when mounted on the unit.
The 48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068
units have 3 hoods on every unit. Each hood has two lower fil-
ter tracks, one slotted side and one side without slots. Construct
the two outer hood assemblies so that the slotted sides are adja-
cent to the center hood when mounted on the unit.
NOTE: Before assembly of the economizer hood, check along
the outer edges of the economizer assembly for any seal strip
protruding past the flanges. Trim the excess seal strip so that it
is flush with the economizer assembly flanges.
SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION
Fig. 34 — Space Temperature Averaging Wiring
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION
BASE BOARD
T30
TB2
2
HIR
Fig. 35 — Field HIR (Heat Interlock Relay) Wiring