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Demand Duo
™
H
-
Series Installation and Operation Manual
48
The system controller maintains communication between the tank and tankless via the tankless
communication cable to effectively control the tank temperature based on the selected temperature on
the tankless unit.
The system controller will energize (120V) the pump when the tank temperature drops. When the tank
temperature returns to the selected set temperature, the system controller will de
-
energize the pump
and remain in standby until the tank temperature drops again.
When power is supplied, the system controller will maintain pump
operation. If system is not in use for an extended period of time,
disconnect power from the system.
ATTENTION
Tank Recovery Pump
Activated
Tankless Flow Rate has
dropped below 2.5 GPM
Slow flash indicates
controller is active with
no errors
Power supply is
working correctly
Figure 58
Displays set
temperature