DIMENSIONS
PHYSICAL DATA
UNIT 48DD
012
OPERATING WEIGHT (lb)
1690
REFRIGERANT
22
Operating Charge (Ib)
9 each System
COMPRESSOR
(2) Reciprocating Hermetic
Cylinders...Rpm (60-Hz)
4 each 3500
OUTDOOR AIR FANS
Propeller; Direct Drive
No. ...Diam (in.)
2 22
Nom Cfm each...total
3200 .6400
1/ 1 140 (3-phase)
Motor Hp...Rpm
1075 (1 -i^hase)
CONDENSER COIL
Plate Fin
Rows... Fins/in.
4 13
Total Face Area (sq ft)
14 0
INDOOR AIR FANS
Centrifugal; Belt Drive
No. ...Size (in.)
2 10x10
Nom Cfm
4000
Rpm Range (Standard Drive)
1230 to 1540
Max Allowable Rpm
1700
Belt Type...Length (in.)
A. 44
Motor
No. ...Hp...Rpm
1 3 1745
Max Brake Hp
3 45
Frame
182T
Shaft Diam (in.)
iVs
Pulley Pitch Diam (in.)
5 6
EVAPORATOR COIL
Plate Fin
Total Face Area (sq ft)
10 02
Rows... Fins/in.
3 14
HEAT EXCHANGERS
Aluminizecd Steel
A.G.A. Certified Rise
45 to 75 F
No. ...Elements (each)
2 .5
SELECTION PROCEDURE (With Example)
I Determine cooling and heating requirements at design
conditions.
GIVEN;
Required Cooling Capacity (TO
Sensible Heat Capacity (SHC)
Required Heating Capacity
Condenser Entering Air Temp
Indoor Air Temp
Evaporator Air Quantity
Electrical Characteristics
External Static Pressure
128.000 Btuh
90,000 Btuh
198.000 Btuh
. 95 F
80 F Edb, 67 Ewb
4000 Cfm
230-3-60
8 in. wg
II Select unit based on required cooling capacity.
Enter Cooling Capacities table at condenser entering air tempera
ture of 95 F. The 48DD012 at 4000 cfm and 67 F Ewb will
provide a total capacity of 132,000 Btuh and a sensible heat of
96,000 Btuh Calculate SHC correction if required
III Compare the heating capacity of the unit selected with the
design conditions.
Unit 48DD012 provides an input of 275,000 Btuh with a bonnet
capacity of 206,000 Btuh
IV Determine fan speed and brake hp requirements at design
conditions.
Enter Fan Performance table. At 4000 cfm and 8 in wg, the fan
speed is 1 405 rpm and brake hp is 2.34 The table indicates that
standard drive is adequate.
V Select unit that corresponds to available power source.
Refer to Electrical Data table and choose unit as required A
48DD012 230-3-60 is available.
(18 pages)
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