Install Motormastert I Controls — Only one Motormaster I
control is required per unit. The Motormaster I control must
be used in conjunction with the Accessory 0° F Low Am-
bient Kit (purchased separately). The Motormaster I device
controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are
sequenced off by the Accessory 0° F Low Ambient Kit.
Accessory 0° F Low Ambient Kit — Install the Accessory
0° F Low Ambient Kit per instruction supplied with
accessory.
Sensor Assembly — Install the sensor assembly in the loca-
tion shown in Fig. 23.
Motor Mount — To ensure proper fan height, replace the ex-
isting motor mount with the new motor mount provided with
accessory.
Transformer (460 and 575-v Units Only) — On 460 and
575-volt units a transformer is required. The transformer is
provided with the accessory and must be field-installed.
Motormaster I Control — Recommended mounting location
is on the inside of the panel to the left of the control box.
The control should be mounted on the inside of the panel,
vertically, with leads protruding from bottom of extrusion.
MOTORMASTER III CONTROL INSTALLATION
(50TJ024 and 028 Only)
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. 22 for baffle
details. Use 20-gage, galvanized sheet metal, or similar
corrosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be
1
⁄
4
-in. diameter
and
5
⁄
8
-in. long. Drill required screw holes for mounting baffles.
Fig. 17 — Outdoor-Air Hood Component Location
Fig. 18 — Seal Strip Location
(Air Hood Cross-Sectional View)
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
BAFFLE
(028 ONLY)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
BAFFLE (028 ONLY)
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
NOTE: The outdoor-air hood comes with a baffle which is used on
028 units only; discard baffle for 016-024 units.
Fig. 19 — Outdoor-Air Hood Details
+
ENTHALPY SENSOR
Fig. 20 — Outdoor-Air and Return-air
Enthalpy Sensor
13
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