Whirlpool Residential Electric water heater Specifications download pdf (Page 21)

RESIDENTIAL ELECTRIC WATER HEATER

SERVICE HANDBOOK

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Technical Training Department 20 of 36 Residential Electric Svc Handbook

THREE-PHASE UN-BALANCED CIRCUIT

Note: For simplicity, the thermostats are not shown.

SIMULTANEOUS DUAL ELEMENTS

(both elements ‘on’ when entire tank is cold)

Element

Wattage

Upper/Lower

Full Load Current in Amperes

Connected to Three Phase Power

(Terminal L2/ Terminals L1 & L3

208V 240V 480V

3000/3000 25.0/14.4 21.7/12.5 10.8/6.3

4000/4000 33.3/19.2 28.9/16.7 14.4/8.3

4500/4500 37.5/21.6 32.5/18.8 16.2/9.4

5000/5000 N/A 36.1/20.8 18.0/10.4

6000/6000 N/A N/A 21.7/12.5

Formula: L2 Amps = wattage* x 1.73 / volts

*Wattage = ½ of total wattage.

UNBALANCED 3 PHASE LOAD

Three phase power delivers power

with 3 legs to the water heater. The

water heater must be specially wired

to accept three phase power. Since

there are only two elements with two

wire terminals each in the water

heater, power from a three leg power

supply cannot be divided evenly.

One leg will have a higher amperage

draw than the other two.

In the diagram at right the connection

to power leg L2 will have the higher

amperage draw. The chart below

gives the amperage draw for L1, L2,

and L3. The maximum amperage

draw per leg is never allowed to

exceed 48 Amps in accordance with

the National Electric Code. The

chart only applies when elements

are wired for simultaneous

operation.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 37 38

SERVICE HANDBOOK 10
TECHNICAL BULLETIN 28

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