Operation - Rinnai HDC 1600i Low NOX Installation And User Manual

Ignition
Press ON/OFF Button of Remote Controller to turn on unit and the remote control-
ler display and priority LED will light up.
When a hot water tap is opened the Water Flow Sensor revolves and sends a pulse
signal to the Printed Circuit Board (PCB). When the PCB detects water flow it com-
pares the measured temperature to the temperature setpoint. If required it begins the
ignition process with the Combustion Fan Motor starting first.
Once the air proving is made the Main Solenoid Valve and Change-over Solenoid
Valves are opened and the Burner is lit by the sparking Igniter.
Temperature Control
Once the Flame Rod proves ignition the HDC modulates by controlling the gas rate,
combustion air, and water flow to precisely heat the water. This control is done by
measuring the outgoing water temperature with a Thermistor.
Standby
When the hot water tap is closed the PCB no longer receives a pulse signal from the
Water Flow Sensor. The PCB shuts the Main Solenoid Valve and Change-over Sole-
noid Valves and the Burner extinguishes.

OPERATION

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