Carrier 48DD - Manual (Page 2)

DIMENSIONS
PHYSICAL DATA
U N I T 4 8 D D 0 1 2
O P E R A T I N G W E I G H T ( l b ) 1 6 9 0
R E F R I G E R A N T 2 2
O p e r a t i n g C h a r g e ( I b ) 9 e a c h S y s t e m
C O M P R E S S O R ( 2 ) R e c i p r o c a t i n g H e r m e t i c
C y l i n d e r s . . . R p m ( 6 0 - H z ) 4 e a c h 3 5 0 0
O U T D O O R A I R F A N S P r o p e l l e r ; D i r e c t D r i v e
N o . . . . D i a m ( i n . ) 2 2 2
N o m C f m e a c h . . . t o t a l 3 2 0 0 . 6 4 0 0
1 / 1 1 4 0 ( 3 - p h a s e )
M o t o r H p . . . R p m
1 0 7 5 ( 1 - i ^ h a s e )
C O N D E N S E R C O I L P l a t e F i n
R o w s . . . F i n s / i n . 4 1 3
T o t a l F a c e A r e a ( s q f t ) 1 4 0
I N D O O R A I R F A N S C e n t r i f u g a l ; B e l t D r i v e
N o . . . . S i z e ( i n . ) 2 1 0 x 1 0
N o m C f m 4 0 0 0
R p m R a n g e ( S t a n d a r d D r i v e ) 1 2 3 0 t o 1 5 4 0
M a x A l l o w a b l e R p m 1 7 0 0
B e l t T y p e . . . L e n g t h ( i n . ) A . 4 4
M o t o r
N o . . . . H p . . . R p m 1 3 1 7 4 5
M a x B r a k e H p 3 4 5
F r a m e 1 8 2 T
S h a f t D i a m ( i n . ) i V s
P u l l e y P i t c h D i a m ( i n . ) 5 6
E V A P O R A T O R C O I L P l a t e F i n
T o t a l F a c e A r e a ( s q f t ) 1 0 0 2
R o w s . . . F i n s / i n . 3 1 4
H E A T E X C H A N G E R S A l u m i n i z e c d S t e e l
A . G . A . C e r t i f i e d R i s e 4 5 t o 7 5 F
N o . . . . E l e m e n t s ( e a c h ) 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.