To avoid damage to the refrigerant coils and electrical
components, use recommended screw sizes only. Use
care when drilling holes.
Replace Outdoor Motor — Replace outdoor fan motor no. 1
with motor included in accessory kit. Existing motor is not
Motormastert III compatible.
Install Motormaster III Controls — Only one Motor-
master III control is required per unit.
Sensor — Install the sensor for thermistor input control in
the location shown in Fig. 24. 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
sensor input signal. Set the frequency to match the unit power
supply (60 Hz).
Motormaster III Control — Recommended mounting loca-
tion is beneath the control box, mounted to the partition that
separates 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 base-
pan to the bottom of the control box.
CONTROL
CURVE
CONTROL POINT
(approx Deg)
AT 50% RH
A 73
B 68
C 63
D 58
LEGEND
RH — Relative Humidity
Fig. 21 — Psychrometric Chart for Solid-State
Enthalpy Control
NOTE: Dimensions in ( ) are in mm.
Fig. 22 — Wind Baffle Details
SENSOR
LOCATION
HAIRPIN END
SENSOR
LOCATION
HAIRPIN END
50TJ016 50TJ020
NOTE: All sensors are located on the eighth hairpin up from the
bottom.
Fig. 23 — Motormaster I Sensor Locations
14
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