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)
Summary of Contents for 551A
Page 14: ...14 TYPICAL WIRING SCHEMATIC Single Fan Units Sizes 036 073 ...
Page 16: ...16 TYPICAL WIRING SCHEMATIC Sizes 155 300 ...
Page 29: ...29 BASE UNIT DIMENSIONS 558F036 072 0TFQ004 012 558F036 150 ...
Page 30: ...30 BASE UNIT DIMENSIONS 558F073 0TFQ004 012 558F036 150 ...
Page 31: ...31 BASE UNIT DIMENSIONS 558F090 102 120 150 0TFQ004 012 558F036 150 ...
Page 32: ...32 BASE UNIT DIMENSIONS 558F091 121 0TFQ004 012 558F036 150 ...
Page 74: ...74 BASE UNIT DIMENSIONS 551B036 072 0TFQ004 012 551B036 150 ...
Page 75: ...75 BASE UNIT DIMENSIONS 551B090 150 0TFQ004 012 551B036 150 ...
Page 133: ...133 BASE UNIT DIMENSIONS 558F180 210 0TFQ004 012 558F180 300 ...
Page 134: ...134 BASE UNIT DIMENSIONS 558F240 0TFQ004 012 558F180 300 ...
Page 135: ...135 BASE UNIT DIMENSIONS 558F300 0TFQ004 012 558F180 300 ...
Page 153: ...153 BASE UNIT DIMENSIONS 551A155 180 0TFQ004 012 551A155 180 ...