12 4 3 x y – Bryant 601A User Manual
Page 10
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601A CORNER WEIGHTS (IN POUNDS)
SELECTION PROCEDURE (WITH EXAMPLE)
I Determine cooling and heating requirements at design
conditions:
Given:
Required Cooling Capacity (TC) . . . . . . . . . . 28,000 Btuh
Sensible Heat Capacity (SHC) . . . . . . . . . . . . 20,500 Btuh
Required Heating Capacity . . . . . . . . . . . . . . 28,550 Btuh
Outdoor Entering Air Temperature . . . . . . . . . . . . . . . 95°F
Outdoor-Air Winter Design Temperature . . . . . . . . . . 20°F
Indoor-Air Winter Design Temperature . . . . . . . . . . . 70°F
Indoor Entering-Air Temperature . . . . . . . . . . . . . 80°F edb
67°F ewb
Indoor-Air Quantity . . . . . . . . . . . . . . . . . . . . . . . .1125 cfm
External Static Pressure. . . . . . . . . . . . . . . . . . 0.30 in. wg
Electrical Characteristics (V-Ph-Hz) . . . . . . . . . . . 230-1-60
edb — entering dry bulb
ewb — entering wet bulb
II Select unit based on required cooling capacity.
Enter Cooling Capacities table at outdoor entering-air
temperature of 95°F, indoor air entering at 1125 cfm and
67°F ewb (entering wet bulb). The 030 unit will provide a
total cooling capacity of 29,100 Btuh and a sensible heat
capacity of 22,900 Btuh.
For indoor-air temperature other than 80°F edb (entering dry
bulb), calculate sensible heat capacity correction, as
required, using the formula found in Note 3 following the
cooling capacities tables. NOTE: Unit ratings are net
capacities.
III Select electric heat.
Enter the 030 unit Heating Capacities table at 1125 cfm. At
70°F return indoor air and 20°F air entering outdoor coil, the
integrated heating capacity is 15,030 Btuh. (Select
integrated heating capacity value since deductions for
outdoor-coil frost and defrosting have already been made.
No correction is required.)
The required heating capacity is 28,550 Btuh. Therefore,
13,520 Btuh (28,550 – 15,030) additional electric heat is
required.
Determine additional electric heat capacity in kW.
13,520 Btuh
3414 Btuh/kW
Enter the Electric Heater table on page 5 for 208/230 v,
single-phase, unit. The 5-kW heater at 240 v most closely
satisfies the heating required. To calculate kW at 230 v,
multiply the heater kW by multiplication factor 0.92 found in
the Multiplication Factors table on page 18.
5 kW x 0.92 = 4.6 kW
4.6 kW x 3414 = 15,704 Btuh
Total unit heating capacity is 30,734 Btuh (15,030 + 15,704).
IV Determine fan speed and power requirements at design
conditions.
Before entering the air delivery tables, calculate the total
static pressure required.
–
= 3.96 kW of heat required
CORNER WEIGHTS (Small Cabinet)
CORNER WEIGHTS (Large Cabinet)
Unit
18
24
30
36
42
Unit
48
60
Total Weight (lbs)
283
289
287
291
323
Total Weight (lbs)
353
418
Corner Weight 1
65
67
66
67
83
Corner Weight 1
76
90
Corner Weight 2
53
56
54
55
55
Corner Weight 2
49
58
Corner Weight 3
61
62
62
63
78
Corner Weight 3
96
114
Corner Weight 4
103
104
105
106
107
Corner Weight 4
132
156
1
2
4
3
x
y
Model 601A