Heating Element Resistance Tables - A.O. Smith DSE-5 Service Handbook

Heating Element Resistance - Six Wire Elements
This table shows the approximate resistance (in ohms) of each loop (see page 17) in a six
wire heating element. First determine the actual rated wattage and voltage of the element
being tested - see page 23. Then follow the Measuring Resistance test procedure on page
29 to measure the resistance of each loop of the six wire element being tested. The 3 ohm
readings, one for each loop, should be approximately the same. Compare the measured
resistance to the values in the table below. Keep in mind there will be some variance
between measured values and the values in this table due to fluctuations in temperature and
the calibration of test instruments being used.
TOTAL
ELEMENT
WATTAGE
3,000
6,000
9,000
12,000
15,000
18,000
Heating Element Resistance - Three Wire (Y Configured) Elements
This table shows the approximate resistance (in ohms) between each wiring lead and the
metal shorting bar on the element flange (see page 17) in a three wire heating element. First
determine the actual rated wattage and voltage of the element being tested - see page 23.
Then follow the Measuring Resistance test procedure on page 29 to measure the resistance
between each wiring lead and shorting bar on the element being tested. The 3 ohm readings
should be approximately the same. Compare the measured resistance to the values in the
table below. Keep in mind there will be some variance between measured values and the
values in this table due to fluctuations in temperature and the calibration of test instruments
being used.
TOTAL
ELEMENT
WATTAGE
3,000
6,000
9,000
12,000
15,000
18,000
Servicing should only be performed by a Qualified Service Agent
OPERATION & SERVICE
SIX WIRE ELEMENT TABLE
WATTAGE
PER LOOP
208 VAC
1,000
2,000
3,000
4,000
5,000
6,000
3 WIRE (Y CONFIGURED) ELEMENT TABLE
APPROXIMATE OHMS BETWEEN EACH
WIRE END AND THE METAL SHORTING BAR
208 VAC
14.43
7.22
4.81
3.61
2.89
2.41
APPROXIMATE OHMS OF EACH LOOP
240 VAC
43.26 57.60
21.63 28.80
14.42 19.20
10.82 14.40
8.65 11.52
7.21 9.60
240 VAC
19.21
9.61
6.40
4.80
3.84
3.20
28
277 VAC 480 VAC
76.73 230.40
38.36 115.20
25.58 76.80
19.18 57.60
15.35 46.08
12.79 38.40
480 VAC
76.85
38.42
25.62
19.21
15.37
12.81