Carrier 09DC - Manual

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9AB,09DC
Air-Cooled Condensers
DESCRIPTION
Capacities to 10 Tons
9AB Air-Cooled Condensers available in nominal
capacities of 5, 7% and 10 tons are designed for verti­
cal installations with horizontal air flow. They may be
located in any area having unobstructed air circula­
tion; the low silhouette permits installation in varied
ground or roof locations. Each unit consists of a direct
drive motor (or motors), fan (or fans), fan guards,
motor mounts, condenser coil with integral subcooling
circuit, wind deflector, and electrical junction box.
Weather Armor* enclosures (which are also provided
for 09DC016) have a baked enamel finish which pro­
vides maximum weather protection.
Capacities 15 Tons and Over
09DC Air-Cooled Condensers are available in 15-,
20-, 25-, 30- and 40-ton sizes. The 25-, 30- and 40-ton
sizes are designed for use in multiples to give capacities
of 50, 60 and 80 tons. Each size has three direct drive
fans, three motors and motor mounts, three guards,
a junction box, and a condenser coil with integral sub­
cooling circuit. The 20-, 25-, 30- and 40-ton units, all
using vertical air flow, may have 2 or 3 circuits, each
with an integral subcooling circuit. Each circuit may
be used as a separate condenser for a single system.
Double-weight, hot dipped, galvanized steel enclosures
give maximum protection.
FEATURES
• Multiple Fans and Motors provide inexpensive, re­
liable system control in intermediate seasons. Standby
protection is provided in case one fan motor fails.
• Subcooling permits greater liquid lift in vertical
risers without liquid flashing. Special coil circuiting
cools liquid refrigerant below the saturated condensing
temperature, extending system capacity without in­
creasing motor horsepower.
• Direct Drive Fans require no tensioning device or
pulleys. Alignment problems, belt maintenance, and
friction loss are eliminated.
• Three Types of Head Pressure Control (Accessory)
are available to maintain a refrigeration load by hold-
ing a minimum head pressure and reducing condenser
capacity at low outdoor temperatures.
1. Motormaster Electronic Control (9AB6, 8, 12 and
09DC016, single-phase) modulates condenser fan
motor speed from zero to full rpm.
2. Fan Cycling Control cycles one fan (9AB8, 12) or
two fans (09DC) for control during intermediate
seasons.
3. Head Pressure Control Damper (09DC024, 084),
mounted below unit at the uncontrolled fan section,
further reduces capacity.
• Winter Start Control — Optional package permits
start-up of compressor regardless of low temperatures.
© Carrier Corporation 1966 • S I N G L E F E A T U R E S H E E T A V A I L A B L E Form 9AB, 09DC-2P