Bryant DURAPAC 551B - Manual (Page 5)

5
OPTIONS AND ACCESSORIES (cont)
MOTORMASTER II CONTROL
(CONDENSER FAN CYCLING)
LOW AMBIENT CONTROLS
Standard units are designed to operate in cooling at outdoor temperatures down to 25 F for size 036-150 units, 40 F for size 150-300 units. With
accessory Motormaster® control (condenser-fan cycling) units can operate at outdoor temperatures down to –20 F. The head pressure controls,
which mount in the condenser section, control the condenser-fan motor to maintain correct condensing temperature.
MOTORMASTER IV CONTROL
(CONDENSER FAN CYCLING)
When used with accessory/optional economizer, the baro-
metric relief or power exhaust accessory helps to relieve
building overpressurization.
NOTE: This is not available with horizontal supply adapter
curb.
BAROMETRIC RELIEF/POWER EXHAUST
(155-300 Shown)
MOTORMASTER I, III CONTROL
(CONDENSER FAN SPEED MODULATOR)