Fuse Sizes - Trane UCCA Installation, Operation And Maintenance Manual

Electrical Requirements
Figure 39. Interface power requirements
Line
24 Vac
voltage
Transformer
Table 10. Electric heat voltage ratings
Unit Voltage
208
230
460
575
Table 11. Electric heat kW limits (min/max)
Motor 3
208 V / 60 Hz / 3 PH 6/13
230 V / 60 Hz / 3 PH 6/13
460 V / 60 Hz / 3 PH 6/13
575 V / 60 Hz / 3 PH 6/13
Min airflow (CFM) 1050
Notes: Units drawing less than 100 amps are available with or without door interlocking disconnect. Units drawing more than 100 amps are not available
with door interlocking disconnect.
Units drawing less than 48 amps are available with or without line fusing. Units drawing greater than 48 amps have line fusing as standard.
Units with electric heat must not be run below the minimum cfm listed above.
Heaters available in the following kW increments: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 41, 44, 47,
50, 53, 56, 59, 63, 67, 71, 75, 79, 83, 87, 91, 95, 100, 110, 115, 120.

Fuse Sizes

The standard ampere ratings for fuses and inverse time
circuit breakers are listed in
inverse time circuit breakers with non-standard ampere
ratings shall be permitted provided the rating does not
exceed the maximum fuse size defined on the unit
nameplate.
Table 12. Standard fuse sizes (amperes)
15 20 25 30 35
80 90 100 110 125
300 350 400 450 500
1200 1600 2000 2500 3000 4000 5000 6000
44
Termination board
Heater Voltage
208
240
480
600
6 8 10
6/26 7/28 8/41
6/26 7/32 8/41
6/24 7/32 8/44
6/26 7/34 8/44
2100 2800 3500
Table 12. The use of fuse and
40 45 50 60
150 175 200 225 250
600 700 800 1000
Useful formulas:
kW = (Airflow x Delta T)/K
Delta T = (kW x K)/Airflow
K = 3145 (English)
K = 824.7 (SI)
Heater input current = (kW x 1000)/(Voltage x 1.73)
MCA = Minimum Circuit Ampacity
MOP = Maximum Overcurrent Protection rating or
Maximum fuse size
12 14
10/50 12/50 14/50
10/53 12/59 14/59
10/53 12/63 14/75
10/53 12/63 14/75
4200 4900
70
17 21 25
17/50 20/47
17/59 20/56
17/95 20/95
17/95 20/95
5950 7350 8750
CLCH-SVX009A-EN
30
20/41
20/50
20/120
20/120
10,500