11
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. 19.
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.
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
NOTE: The outdoor-air hood comes with a baffle which is not used
on 50HJQ units. Discard the baffle.
Fig. 17 — Outdoor-Air Hood Details
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
NOTE: Dimensions in ( ) are in mm.
Fig. 18 — Wind Baffle Details
MOTORMASTER
SENSOR
LOCATION
HAIRPIN END
Fig. 19 — Motormaster® I Sensor Locations
NOTES:
1. All sensors are located on the eighth
hairpin up from the bottom.
2. Field-installed tubing insulation is
required to be installed over the TXV
bulb and capillary tube for proper
operation at low ambients. Tubing
insulation is only required on the por-
tion of suction line located between
indoor and outdoor section.
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