Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 33
Wiring and
Conduit
Punch-Out
Black (Hot)
b. Remove the two screws securing the front
panel to the gang box. Then, remove the front
panel.
e. Use the two screws to reinstall the front
panel to the gang box.
f. When the building electrical
power supply has been wired
to the rack system, plug the
two tankless units into the
electrical assembly.
c. Run building-supplied electrical wiring and
conduit to the gang box.
d. Connect the building wiring to the three 12
AWG, THHN wires: Hot (Black), Neutral
(White), and Ground (Green). Use wire nuts
or other approved wire connectors.
White
(Neutral)
Green
(Ground)
DO NOT plug the controller power cord into the
electrical assembly until the storage tank is
filled as the pump will overheat.
WARNING
• The digital controller maintains
communication between the tank and
tankless water heater to effectively control
the tank temperature based on the selected
temperature on the tankless water heater.
• By reading the tank temperature and
tankless outlet temperature, the digital
controller turns on the pump when the tank
temperature drops. When the tank
temperature returns to the selected set
temperature, the digital controller turns off
the pump and remains in standby until the
tank temperature drops again.
• Refer to the Controller Diagnostics
section in the Appendix for controller
diagnostic information.
2. Plug the controller power cord into the
electrical assembly on the storage tank.