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LEGEND HEATERS<br />
SERVICE WORKBOOK<br />
LEGEND HEATERS<br />
SERVICE WORKBOOK<br />
HIGH LIMIT SWITCH TEST<br />
2R (120V SPDT) RELAY TERM 4 CHECK<br />
S<br />
T<br />
E<br />
P<br />
17<br />
High Limit Switch Test<br />
Control should be set at least 30° higher than the tank temperature<br />
control setting.<br />
Test for 24 VAC from each high limit terminal to ground.<br />
Ignition Proving Period<br />
RESULTS<br />
If the meter: and you are then<br />
does not read 24 VAC either<br />
check wire<br />
terminal to ground<br />
connection to yellow<br />
does read 24 VAC to only one<br />
terminal<br />
does read 24 VAC from each<br />
terminal to ground<br />
certain that the control is<br />
calling for heat and the<br />
reset button has been<br />
pushed<br />
flow switch terminal.<br />
replace control.<br />
go to step 18.<br />
S<br />
T<br />
E<br />
P<br />
24b<br />
LW/LB<br />
500 &<br />
750<br />
RESULTS<br />
2R (SPDT) Relay Term 4 Check<br />
Test for 120 VAC 2R relay terminal 4 to ground.<br />
If the meter:<br />
then<br />
does not read 120 VAC,<br />
replace 2R relay.<br />
does read 120 VAC, go to Step 24c.<br />
A.O. <strong>Smith</strong> <strong>Water</strong> Products Co.<br />
Irving, Texas © 1997<br />
36<br />
Service Workbook<br />
Training Department<br />
A.O. <strong>Smith</strong> <strong>Water</strong> Products Co.<br />
Irving, Texas © 1997<br />
45<br />
Service Workbook<br />
Training Department
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