SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
TEST 3 - CONTINUITY CHECK OF HIGH LIMIT (ECO)-CONTINUED
TEST 3
Continuity check of ECO (energy
Black to Black wires of upper probe. Power is off.
If… |
| ...then | |
continuity | is indicated | opens at 203° F; closes at 193° F. If water is | |
below 193° F, continuity is correct. | |||
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continuity | is not present | replace ECO sensor, if water temperature is | |
below 193° F. | |||
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| •reset status LED should be on. | |
water is less than 120° F | •replace heater control if control will not manually | ||
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| reset. | |
TEST 4 - UPPER TEMPERATURE PROBE CONTINUITY CHECK
Conditions:
Power On - Water below tempera- ture set point.
Red, heater control “Reset Status”
“Call For Heat” LED off.
Ohms Resistance Table
° F | Ohms |
70° | 11,884 |
120° | 3,759 |
140° | 2,488 |
180° | 1,169 |
TEST 4
Upper Temperature probe continuity check
Red wire to red wire - Turn supply power "Off" for this test
If… | ...then |
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test indicates no continuity | replace probe. |
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| probe should be okay (also verify Ohms |
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continuity is indicated | resistance for water temperature). (Reading will | |
| be approximate.) |
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Technical Training Department | 29 | ©2003 |
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Ashland City, Tennessee
