50Sz Corner Weights And Suggested Rigging; Selection Procedure (With Example) - Carrier 50SZ Series Product Data

50SZ CORNER WEIGHTS AND SUGGESTED RIGGING

1
y
4
CORNER WEIGHTS (SMALL CABINET) Lbs.
Unit 024
Total Weight 343
Corner Weight 1 69
Corner Weight 2 53
Corner Weight 3 83
Corner Weight 4 138
Rigging Weight 353
Shipping Weight 373

SELECTION PROCEDURE (WITH EXAMPLE)

I. Determine cooling and heating requirements of design condi-
tions:
Given:
Required Cooling Capacity (TC)
Sensible Heat Capacity (SHC)
Required Heating Capacity (SHC)
Outdoor Entering Air Temperature
Outdoor- -Air Winter Design Temperature
Indoor- -Air Winter Design Temperature
Indoor Entering- -Air Temperature
Indoor- -Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . .
External Static Pressure . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics (V- -Ph- -Hz)
edb ⎯ entering dry bulb
ewb ⎯ entering wet bulb
II. Select unit based on required cooling capacity.
Enter Cooling Extended Performance table at outdoor entering- -air
temperature of 95_F (35°C), indoor air entering at 1125 cfm and
67_F (19.4°C) ewb (entering wet bulb). The unit will provide a total
cooling capacity of 30,900 Btuh and a sensible heat capacity of
24,800 Btuh.
For indoor- -air temperature other than 80_F (26.6°C) edb (entering
dry bulb), calculate sensible heat capacity correction, as required,
2
3
x
C00071
030 Unit
366 Total Weight
74 Corner Weight 1
57 Corner Weight 2
88 Corner Weight 3
147 Corner Weight 4
376 Rigging Weight
396 Shipping Weight
. . . . . . . . . . . . . . 28,000 Btuh
. . . . . . . . . . . . . . . . 20,500 Btuh
. . . . . . . . . . . . . 28,550 Btuh
. . . . . . . . . . . . . 95°F (35°C)
. . . . . . . 20°F (- -6.6°C)
. . . . . . . . 70°F (21.1°C)
. . . . . . . . . . . . . 80°F (26.6°C)
67°F (19.4°C) ewb
1125 cfm
0.20 in. wc
. . . . . . . . . . . . . 230- -1- -60
DETAIL A
CORNER WEIGHTS (LARGE CABINET) Lbs.
036 042
433 460
87 93
68 72
104 111
174 184
443 470
463 490
using the formula found in Note 3 following the cooling capacities
tables. NOTE: Unit ratings are net capacities.
III. Select electric heat.
Enter the unit Heating Extended Performance table at 1125 cfm. At
70_F (21.1°C) return indoor air and 20_F (- -6.6°C) air entering out-
door coil, the integrated heating capacity is 16,200 Btuh. (Select in-
tegrated heating capacity value since deductions for outdoor- -coil
frost and defrost have already been made. No correction is required.)
The required heating capacity is 28,550 Btuh. Therefore, 12,350
Btuh (28,550 - - 16,200) additional electric heat is required.
Determine additional electric heat capacity in kW.
12,350 Btuh = 3.6 kW of heat required
3,414 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 heat-
ing required. To calculate kW at 230 v, multiply the heater kW by
multiplication factor 0.92 found in the Multiplication Factors table
on page 17.
5 kW x 0.92 = 4.6 kW
4.6 kW x 3414 = 15,704 Btuh
Total unit heating capacity is 31,900 Btuh (16,200 + 15,704).
IV. Determine fan speed and power requirements at design condi-
tions.
Before entering the air delivery tables, calculate the total static pres-
sure required.
10
A05161
048 060
480 492
97 99
74 76
116 119
193 198
490 502
510 522