Installation Guide

SERVICE
26 • Electric Tankless Water Heater
POWER
SUPPLY
TERMINAL
BLOCK
L1
L2/N
GND
T-Aux **
T-In **
T-Out
T-Aux
Auxiliary thermistor
T-In
Inlet thermistor
T-Out
Outlet thermistor
Thermistor* Connections
OUTLET INLET
Outlet Thermistor *
(Connects to T-Out)
Auxiliary Thermistor *
(Connects to T-Aux)
Inlet Thermistor *
(Connects to T-In)
* Often referred to
as a temperature
sensor.
** If the inlet
thermistor fails,
there is no need
to replace it.
Simply switch the
T-Aux and T-In
plugs on the
control board.
NOTICE:
Appearance of cap
may vary.
Figure 22.
Thermistor loca ons
(Point-of-use models)
Inlet Thermistor *
(connects to TH-IN)
OUTLET INLET
TH-IN
Inlet thermistor.
TH-1
Intermediate thermistor
TH-2
Outlet thermistor
Thermistor* Connections
* Often referred to as a
temperature sensor.
L1
L2
TH-1
TH-2
TH-IN
Intermediate
Thermistor *
(connects to
TH-1)
Outlet Thermistor *
(connects to TH-2)
HEATING ELEMENTS
Figure 23.
Thermistor loca ons
(Two-chamber
models)
Inlet Thermistor *
(connects to TH-IN)
INLET
L1
L2
TH-1
TH-3
TH-4
Intermediate
Thermistor *
(connects to
TH-1)
TH-2
TH-IN
L1
L2
TH-IN
Inlet thermistor.
TH-1
Intermediate thermistor
TH-4
Outlet thermistor
Thermistor* Connections
* Often referred to as a
temperature sensor.
TH-2
Intermediate thermistor
TH-3
Intermediate thermistor
OUTLET
Outlet Thermistor *
May be located on
outlet elbow.
(connects to TH-4)
Intermediate Thermistor *
(connects to TH-3)
Intermediate
Thermistor *
(connects to
TH-2)
Figure 24.
Thermistor loca ons (Four-chamber models)