Aqua-Hot AHE-100-02S, Руководство по обслуживанию

Страница: 18 / 106

— Page 18 —
© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
S
ECTION
5: A
QUA
-H
OT
C
OMPONENTS
AC High-Limit Thermostat:
The AC high-limit thermostat serves as a safety measure in
the event that the electric heating element continues to oper-
ate after the maximum operating temperature is reached.
The high-limit thermostat allows the current for the heating
element to pass through it until the boiler tank reaches a tem-
perature of 230°F. Should this temperature be reached, the
high-limit thermostat blocks the current to the element,
which prevents it from continuing to provide heat to the boil-
er tank.
Troubleshoot the AC high-limit thermostat if the following
condition has occurred:

The electric heating element fails to operate.
Troubleshooting:
1.
Disconnect all power supplies.
2.
Remove the thermostat access cover.
3.
Verify that the boiler tank’s temperature is below 230°F.
4.
Locate the AC high-limit thermostat and remove its
wires.
5.
Using an ohmmeter, check the thermostat for continuity.
If continuity is not present, follow the instructions in this
section to replace the AC high-limit thermostat.
Replacement Procedure:
F
AILURE TO DISCONNECT ALL POWER SUPPLIES AND
/
OR
TO ALLOW THE HEATER TO COOL BEFORE SERVICING
COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY
.
1.
Ensure that the Aqua-Hot has been completely shut
down and that all power sources have been disconnect-
ed. Also, because this replacement procedure will in-
volve the boiler tank and the potential for hot coolant, be
sure the heater has adequately cooled.
2.
Disconnect the defective thermostat’s wires by remov-
ing the screws securing the wires to the terminals.
3.
Using a 1/4” nut driver, unscrew the two screws secur-
ing the thermostat to the Aqua-Hot’s boiler tank thermo-
stat mounting bracket.
4.
Install the replacement thermostat into the thermostat
mounting bracket and secure with the two screws previ-
ously removed.
5. Inspect the wires going to the thermostat, Replace if
necessary. Re-Connect the thermostat’s wires and se-
cure in place using the screws previously removed.
6.
Test the Aqua-Hot for normal operation.
Figure 10
Note:
If a screw longer than 1/4” is used to secure the
thermostat in place, it may cause the thermostat mounting
bracket to be pushed away from the boiler tank, and may
result in overheating.