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OPTIONS AND ACCESSORIES (cont)
LOW AMBIENT CONTROLS
Standard units are designed to operate in cooling at outdoor temperatures down to 25 F (for size 036-120 units) and 40 F (for size 150,180 units).
With accessory Motormaster control (outdoor-fan cycling) units can operate at outdoor temperatures down to –20 F. The head pressure controls,
which mount in the outdoor section, control the outdoor-fan motor to maintain correct condensing temperature.
MOTORMASTER IV CONTROL
(OUTDOOR FAN CYCLING
MOTORMASTER II CONTROL
(OUTDOOR FAN CYCLING)
When used with accessory/optional economizer, the barometric relief or
power exhaust accessory helps to relieve building overpressurization.
NOTE:
This is not available with horizontal supply adapter curb.
MOTORMASTER I, III CONTROL
(OUTDOOR FAN SPEED MODULATOR)
Emergency heat control package allows emergency operation of
electric heat and fans by bypassing compressor circuits and out-
door thermostats.
BAROMETRIC RELIEF/POWER EXHAUST
(150,180 shown)
EMERGENCY HEAT CONTROL PACKAGE