AMPERAGE TABLE/OVERCURRENT
PROTECTION
This table provides the total connected heating element load in amperes for branch circuit conductor and over current protection sizing.
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.
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