TR/HL and SMART Series
Thermostat Replacement Instructions
5
SMART Series - Installed after 2009
1. Disconnect power to the water heater.
2. Remove the thermostat knob, DO NOT DIS-
CARD THE KNOB.
3. Slide the plastic flanges up on the auxiliary
(third) domestic piping allowing clearance to lift
the thermostat cover plate.
4. Use a slotted screwdriver between the top lid
and the thermostat cover plate to disengage the
snap down pins. Use care not to damage the lid
or cover plate.
5. Remove the capillary line and sensing bulb
from the drywell located under the cover plate.
Prior to removing the thermostat note the posi-
tion of the thermostat terminals.
6. Disconnect the (2) wires connected to the ther-
mostat.
7. Remove (2) mounting screws to separate the
thermostat from the cover plate.
8. Discard the thermostat in a proper manner,
unless the distributor has requested its return.
9. Reconnect the (2) wires to the new thermostat
terminals shown in Figure 1. On the Smart 80,
100 and 120 place the ring terminal of the
Yellow/Green wire over the thermostat stem
prior to mounting the thermostat onto the cover
plate.
10. Mount the new thermostat to the cover plate
with the (2) machine screws. Orientate the ther-
mostat terminals in the same direction as the
original thermostat.
11. Re-insert the capillary line and sensing bulb into
the drywell until the bulb reaches the bottom.
Make sure the thermostat capillary line is
not kinked or damaged. A defective capillary
line can cause the thermostat to fail, result-
ing in a situation that can result in severe
personal injury or death.
12. Position the cover plate onto the lid, snap the
locking pins into the lid securing the cover
plate.
13. Reconnect power to the water heater.
15. Install the existing knob and adjust the thermo-
stat to desired temperature according the
instructions at the end of this document.
WARNING
