AMPERAGE TABLE/OVERCURRENT

PROTECTION

This table provides the total connected heating element load in amperes for branch circuit conductor and over current protection sizing. Single-phase heaters are two wire circuits. Three-phase heaters are three wire circuits. In addition to the foregoing a ground conductor may be required.

The rating of the overcurrent protection should be computed on the basis of 125 percent of the total connected load amperage. Where the standard ratings and settings do not correspond with this computation, the next higher standard rating or setting should be selected.

CONTROL CIRCUIT

The heater is equipped with 120 volt control circuit where all of the heating elements are switched on and off together. This is the standard circuit and may be used with up to five elements.

The control circuit wiring is 14 AWG rated 600 volts, 105°C.

A low water cutoff switch is available as an optional safety device to protect the elements from damage due to lack of water in the heater.

POWER CIRCUIT

Power circuit wiring is rated 600 volts, 75°C.

HEATER CIRCUITS

WIRING DIAGRAMS

 

The water heater’s electrical components are pictured and identified in Figure 1.

The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60 hertz alternating current.

The following wiring diagrams are included in this manual to show typical arrangement of electrical components in the control and power circuits by voltage and phase characteristics. They are to be used as a reference by the installer or servicer in performing their work. An actual diagram of the water heater wiring is furnished with the heater.

STANDARD KW INPUTS

Standard

Immersion

 

Number of

 

 

Full Load Current In Amperes

 

KW

Heaters***

50A Contractors

 

Single Phase

 

 

Three Phase

 

Ratings

No. Of

Wattage

208V

 

240V

 

480V

208V

240V

277V

480V

208V

240V

480V

3

1

3,000

 

 

 

 

 

14.4

12.5

10.8

6.3

8.3

7.2

3.6

6

1

6,000

1

 

 

 

 

28.8

25.0

21.2

12.5

16.7

14.4

7.2

9

1

9,000

 

 

1

 

 

43.3

37.5

32.5

18.8

25.0

21.7

10.8

12

1

12,000

 

 

 

 

1

57.7

50.0

43.3

25.0

33.3

28.9

14.4

15

1

15,000

 

 

 

 

 

72.1

62.5

54.2

31.3

41.6

36.1

18.0

18*

1

18,000

 

 

 

 

 

86.5

75.0

65.0

37.5

50.0

43.3

21.7

24

2

12,000

2

 

 

 

 

115.4

100.0

86.6

50.0

66.6

57.7

28.9

30

2

15,000

 

 

2

 

 

144.2

125.0

108.3

62.5

83.3

72.2

36.1

36*

2

18,000

 

 

 

 

 

173.1

150.0

130.0

75.0

99.9

86.6

43.3

45

3

15,000

3

 

3

 

 

216.3

187.5

162.5

93.8

124.9

108.3

54.1

54

3

18,000

 

 

 

 

2

N/A

225.0

194.9

112.5

149.9

129.9

65.0

60**

4

15,000

4

 

4

 

 

N/A

250.0

216.6

125

166.7

145

72

75**

5

18,000

5

 

5

 

3

N/A

312.5

270.8

156

208.4

181

90

90**

5

18,000

 

 

 

 

 

N/A

375.0

324.9

188

250

217

108

*208V models use one additional immersion heater.

**Available on 50 gallon models or larger.

***Each immersion heater contains three electric elements.

14

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State Industries SSE-5, SSE-120 warranty Amperage TABLE/OVERCURRENT Protection, Control Circuit, Power Circuit

SSE-120, SSE-5 specifications

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