Carrier 48DD User Manual download pdf

Carrier

/У

— 'y

Combination Heating/

Cooling Units

48DD

Gas Heating 275,000 Btuh

Electric Cooling 124,000 Btuh

48DD012

DESCRIPTION

The 48DD012 is a one-piece combination gas heating/

electric cooling unit designed primarily for outdoor rooftop

installation on a factory-supplied curb accessory but can be

installed on grade or conventional steel framework. This

unif combines superior performance with compactness,

versatility of application and ease of installation to supply

year-round air conditioning for commercial and industrial

buildings The unit is completely factory assembled,

charged and tested Requires only natural gas, and suitable

electrical and duct connections for hookup. Air can be

supplied to the building either thru bottom of the unit or

thru the side A manually-adjustable outdoor air intake is

provided Condensers are air cooled Low silhouette design

allows units to be easily hidden from street level view

FEATURES

• Two-Stage Heating and Cooling — Both heating and

cooling stages have 50 percent or 100 percent capacity

ranges of operation This reduces operating costs

• Multiple Choice of Air Flow — Air can be delivered to

the building either thru the bottom of the unit with

separate inlet and outlet air ducts or concentric ducting, or

it can be delivered thru the side of the unit with separate

inlet and outlet air ducts

• Gas Safety Control will shut off the main gas valve in

case of pilot or combustion air failure, or overheating of the

heat exchangers

• Induced Draft Combustion — Unaffected by winds and

drafts Equipped with safety shut-off devices in case of

combustion air failure or blockage

• Automatic Electric Ignition — Pilot flame is auto

matically relighted in case of interruption of power or gas

• Aluminized Heat Exchangers — Resist corrosion and

provide long, quiet, safe, and efficient operation These

heat exchangers have a full ten-year warranty

• Time Guard Circuit* prevents rapid cycling, extends

compressor life When power to unit is interrupted,

compressor cannot restart for five minutes

• Head Pressure Control automatically cycles one of two

condenser fans, permitting cooling operation down to 35 F

ambient temperature

• Other Quality Components — Crankcase heaters and

accumulators to protect the compressor against flooded

starts, filter-driers and sight glasses for moisture control and

visual inspection of refrigerant charge

ACCESSORIES

• 32LM MotormasterTM Head Pressure Control mod

ulates speed of condenser fan motor to maintain saturated

condensing temperature at low outdoor temperatures

• Thermostat Assembly is a two-step heating/two-step

cooling thermostat and a matching switch base Either

automatic or manual changeover is available

• Remote Control Center allows manual control of the

unit from a location remote from the thermostat The

thermostat furnished with the remote control center has no

knobs or switches for manual control

• Roof Curb frames roof opening, is watertight connec

tion between unit and roof Designed so ductwork and roof

flashing may be installed prior to placing the unit

• Modulating Outside Air Control Package (economizer)

can furnish outside air for cooling when outside air

temperature is below 60 F. It can replace operation of the

refrigerant system under these conditions

• LP Conversion Kit used to convert the unit from natural

gas to LP gas usage

• Relief Damper used to relieve positive building pressure

•Single Feature Sheet Available Form 48DD-1 P

1 2 3 4 5 6

Summary of Contents

Page 1 - Cooling Units

Carrier/У— 'yCombination Heating/ Cooling Units48DDGas Heating 275,000 Btuh Electric Cooling 124,000 Btuh48DD012DESCRIPTIONThe 48DD012 is

Page 2 - PHYSICAL DATA

DIMENSIONSPHYSICAL DATAUNIT 48DD012OPERATING WEIGHT (lb)1690REFRIGERANT22Operating Charge (Ib)9 each SystemCOMPRESSOR(2) Reciprocating HermeticCylinde

Page 3 - PERFORMANCE DATA

PERFORMANCE DATACOOLING CAPACITIES (60-Hz)48DD012 ARI* - 124,000 BTUHT emp (F) Air Ent CondEvap A 3000/.08” I ’ 4"cir — Cfm/B F)6o/. 1 200/.10 1

Page 4 - ELECTRICAL DATA

ELECTRICAL DATAOPERATING SEQUENCETYPICAL WIRINGCooling — Power on and thermostat assembly set at "Cool,” "Fan Auto" and desir

Page 5 - APPLICATION

ELECTRICAL DATA (Cont)ELECTRICAL DATA (60-Hz)V/PHVOLTAGERANGEUNITCOMPR* IFM OFMWSA ICFFU FLA LRA FLA (ea)208/3 220-18079.6152100 27.601 1010.63.2230/3

Page 6 - GUIDE SPECIFICATIONS

APPLICATION (Coni)LOW OUTDOOR TEMPERATURE COOLING OPERATIONIt is not necessary to use the refrigeration system for cooling when the outdoo

Comments to this Manuals

No comments

Carrier 48DD User Manual

Browse online or download User Manual for Radiators Carrier 48DD. Carrier 48DD User Manual [en]

Summary of Contents

Comments to this Manuals

Related products and manuals for Radiators Carrier 48DD