Electrical Data

Minimum Circuit Ampacity

(MCA) and Maximum Fuse

Size (MFS) Calculations

Units with Electric Heat

HACR (heating, air conditioning, and refrigeration) type circuit breakers are required in the branch circuit wiring for all units with electric heat. To compute MCA and MFS, see Tables ED-2 through ED-5 on page 31 for motor FLAs and Tables ED-6 through ED-8 on pages 32-33 for electric heat amps.

Calculating electric heat amps: Single stage, three phase = heat kW * 1000/1.732/volts

Two stage, three phase =

total heat kW * 1000/1.732/volts

Note: Use 240V heat voltage for 230V units.

Calculating MCA:

MCA = 1.25 * (heat amps + sum of all motor FLAs)

Calculating MFS:

MFS = (2.25 * largest motor FLA) + second motor FLA, size 10-12 units only + heat amps

Use the closest larger fuse or HACR circuit breaker above the MCA. Standard fuse sizes are: 15, 20, 25, 30, 35, 40, 45, 50, 60 amps.

Electric heat MBH = heater kW * 3.413

Units Without Electric Heat

To compute MCA and MFS, see Tables ED-2 through ED-5 on page 31 for motor FLAs and Tables ED-6 through ED-8 on pages 32-33 for electric heat amps.

Calculating MCA:

MCA = (1.25) x largest motor FLA + second motor FLA, unit sizes 10-12 only

Calculating MFS:

MFS or HACR1 type circuit breaker = 15 amps for all units without electric heat.

1HACR (heating, air-conditioning and refrigeration) type circuit breakers are required in the branch circuit wiring for all size 10 and 12 units.

Table ED-1. Decimal to Fractional HP (kW) Conversion

Unit Size

Decimal

Fraction

02

 

.03

 

1/30

 

 

.07

 

1/15

03

 

.04

 

1/25

 

 

.05

 

1/20

 

 

.08

 

1/12

04

 

.05

 

1/20

 

 

.06

 

1/16

 

 

.10

 

1/10

 

 

.13

 

1/8

06

 

.07

 

1/15

 

 

.12

 

1/8

 

 

.16

 

1/6

 

 

.24

 

1/4

08

 

.12

 

1/8

 

 

.13

 

1/8

 

 

.24

 

1/4

10

.05

.07

1/20

1/15

 

.06

.12

1/16

1/8

 

.10

.16

1/10

1/6

 

.13

.24

1/8

1/4

12

.05

.12

1/20

1/8

 

.06

.13

1/16

1/8

 

.10

.24

1/10

1/4

 

.13

.24

1/8

1/4

Note:

Values for fractional HPs (kWs) are approximate values and not necessarily the actual HP (kW).

30

CAB-PRC001-EN

Page 30
Image 30
Trane CAB-PRC001-EN manual Electrical Data, Units with Electric Heat, Calculating MCA, Calculating MFS

CAB-PRC001-EN specifications

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