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16
Install Motormaster 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 Ambient Kit
(purchased separately). The Motormaster I device controls out-
door 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 location
shown in Fig. 26.
Motor Mount —
To ensure proper fan height, replace the exist-
ing 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, verti-
cally, 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. 25 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.
Replace Outdoor Motor
— Replace outdoor fan motor no. 1
with motor included in accessory kit. Existing motor is not
Motormaster® III compatible.
Install Motormaster III Controls
— Only one Motormaster
III control is required per unit.
Sensor —
Install the sensor for thermistor input control in the
location shown in Fig. 27. Connect sensor leads to the purple
and grey control signal leads on the Motormaster III control.
Signal Selection Switch —
Remove the cover of the Motor-
master III control. Set the switch to accept the thermistor sen-
sor input signal. Set the frequency to match the unit power sup-
ply (60 Hz).
Motormaster III Control —
Recommended mounting location
is beneath the control box, mounted to the partition that sepa-
rates the control box section from the indoor section.
NOTE: If unit power is supplied through the roof curb and
basepan of the unit, mount the Motormaster III control on the
corner post adjacent to the conduit running from the basepan to
the bottom of the control box.
Step 10 — Install Humidistat for Optional
MoistureMiser Dehumidification Package —
MositureMiser dehumidification package operation can be
controlled by field installation of a Carrier-approved humidis-
tat. To install the humidistat perform the following procedure:
1. Locate humidistat on a solid interior wall in the condi-
tioned space. Location should be a well ventilated area
to sense average humidity.
2. Route thermostat cable or equivalent single leads of col-
ored wire from Humidistat terminals through conduit in
unit to the low voltage connection on the 2-pole terminal
strip (TB3) as shown in Fig. 28 and Fig. 29.
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
NOTE: Dimensions in ( ) are in mm.
Fig. 25 — Wind Baffle Details