Use and Care & Installation Guide

18 • Residen al Electric Water Heater Use and Care Guide
INSTALLATION
18 • Residen al Electric Water Heater Use and Care Guide
INSTALLATION
The Electronic Thermostat
IMPORTANT: The Energy Saver Module
(ESM) must be removed before a empt-
ing to access the thermostat. NOTE: for
the Electronic Thermostat (ET) changes
to remain in eff ect the Energy Saver
Module (ESM) must not be reconnected,
also read the “Water Temperature Regu-
la on” under the “Opera ng Your Water
Heater” sec on. If the instruc ons are
not clear, contact a qualifi ed service
technician.
The Energy Saver Module (ESM) is in-
tended to serve as the primary interface
for opera ng the water heater; however,
the Electronic Thermostat (ET) may
control the water heater in the absence
of the Energy Saver Module (ESM).
The Electronic Thermostat consists of
an electronics box that contains a low
voltage power supply, the thermostat
set point knob, relays to switch between
the upper and lower hea ng elements,
one control thermistor, a connector for
the lower element control thermistor,
microelectronics to convert the thermis-
tor signals and perform switching and
other logic func ons, and a connector
to  e the Electronic Thermostat (ET) to
the Energy Saver Module (ESM) located
on the front of the water heater jacket.
The majority of the self-diagnos cs are
located in the Electronic Thermostat
(ET), including the dry-fi re protec on
intelligence. The thermostat circuit is
designed so that when the upper heat-
ing element calls for heat, the power
is directed to that element even if the
lower element is also calling for heat.
Diagnos c LED Light
The Green/Red LED light indicates the
status of the electronic thermostat (See
Figure 9).
• Green LED will signal normal opera-
 on. The green LED will blink 2  mes
per second to indicate that power is ap-
plied to the upper hea ng element and
at a faster rate (4  mes per second) to
indicate that the lower hea ng element
is powered.
• Red LED will fl ash error codes. If
a fault is detected by the electronic
thermostat, the LED light indicator will
use the red LED to indicate the fault
detected. The fl ash code sequence is to
consist of 1/2 second fl ashes of the red
LED each separated by a 1/2 second off
period.
The number of fl ashes indicates the
fault code number.
(See diagnos c code chart sec on in
this manual, page 22).
A er the last 1/2 second “on” period,
the LED will remain off un l a total of 5
seconds has elapsed for the fault indica-
 on cycle (there is a 5 seconds delay
before the fault fl ash pa ern repeats).
A er the 5 seconds are completed, the
fault indica on cycle is repeated star ng
with the fi rst 1/2 second-fl ash. The fl ash
sequence will be repeated as long as
the fault remains. Only one fault can
be declared at a  me. NOTE: the green
LED is turned off when a fault code is
being displayed, even though the heater
may be opera ng in limp mode with an
element on. See diagnos c code chart
sec on in this manual.
Overriding The Energy
Saver Module (ESM)
If the Energy Saver Module (ESM) is not
working, simply unplug the interface
module and turn the set point knob on
the Electronic Thermostat (ET) to the
desired temperature (See Figures 9 &
10). To replace a broken or damaged
ESM module, see page 36 for ordering
informa on.
Figure 9
Electronic Thermostat (ET)
Diagnostic
LED Light
ECO Reset
Button
Setpoint
Knob
Remove Only After Power Is
Turned O When Replacing Element.
Plastic Guard
Upper
Element
Electronic Thermostat (ET)
NOTE: Smart Grid will be disabled when the
Energy Saver Module (ESM) is disconnected
from the junc on box wiring harness.
Energy Saver
Module (ESM)
Figure 10
Electronic
Thermostat (ET)
Thermostat
Setpoint Knob
Junction Box
Wiring Harness
Thermistor
Wire Harness
WARNING! Electrical Shock Hazard
Do not remove the plas c guard from
over wiring.
Do not touch electrical wiring.
Failure to do so can result in death or
electrical shock.
WARNING! Electrical Shock Hazard
Do not remove the plas c guard from
over wiring.
Do not touch electrical wiring.
Failure to do so can result in death or
electrical shock.