Bryant 549B OPTIONS AND ACCESSORIES cont, Low Ambient Controls, Emergency Heat Control Package

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 I, III CONTROL

(OUTDOOR FAN SPEED MODULATOR)

MOTORMASTER II CONTROL	EMERGENCY HEAT CONTROL PACKAGE
(OUTDOOR FAN CYCLING)

BAROMETRIC RELIEF/POWER EXHAUST

(150,180 shown)

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.

Emergency heat control package allows emergency operation of electric heat and fans by bypassing compressor circuits and out- door thermostats.

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