Operating Principles; Normal Operation - Rinnai ENERGYSAVER RHFE-308FTR Service Manual

9. Operating Principles

1. Normal Operation

Push the ON/OFF Button to operate the appliance. The Power ON/Combustion Indicator will glow green.
The combustion fan will run on high until pre-purge is completed.
Pre-purge is completed after approximately 15 seconds, following which, the combustion fan will decrease
revolutions to enable ignition to occur. After the combustion fan reaches a pre-determined speed,
(depending on gas type) the electrode produces the spark to begin the ignition cycle.
After the spark is sensed as having crossed the spark gap by the PCB, the solenoids (SV & SV ) as well
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as the modulating valve will open and allow gas to flow to the burner.
The flame rod senses the flame on the main burner. After the flame is sensed, the Power ON/Combustion
Indicator changes to red and the spark stops. After an additional 15 seconds the convection fan begins to
operate.
The room temperature is sensed by the temperature thermistor located at the rear of the appliance. The
printed circuit board controls the air/gas ratio to the optimum level according to the selected temperature.
The combustion fan is adjusted in conjunction with the opening degree of the modulating valve. The
convection fan is adjusted in the same manner.
2. Thermostat Control
The selected and room temperatures are displayed on the Time/Temp Display. Time and temperature are
displayed alternately depending whether the heater is running or not. The selected temperature is altered by
pressing the Time/Temperature Adjustment buttons.
3. Turning Off
Simply press the ON/OFF Button. The solenoids, together with the modulating valve will close. The
combustion fan will also stop, and all indicators will go out. After the burner extinguishes, the convection
fan will continue to run for up to 210 seconds, ensuring the appliance is cool.
4. Economy Mode
To engage the economy function press the Economy button while the heater is operational. The Economy
Indicator will glow. Once the selected temperature has been reached, the economy function is designed to
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drop this temperature by a total of 2 C over a period of one hour. After 30 minutes the temperature will be
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reduced by 1 C. After a further 30 minutes the temperature will be reduced by another 1 C. This does not
result in a loss to the heating effectiveness, and is an energy saving feature. You may press the Economy
button again at any time, to cancel the economy function.
5. Child Lock
To activate the child lock press the Child Lock button. The Lock Indicator will glow.
If the child lock is activated during normal operation, then no functions other than the ON/OFF Button will
be operable until the lock is released.
If the child lock is activated whilst the appliance is OFF, then the complete range of functions will be
locked.
Energysaver RHFE-308 FTR - 12 - ©Rinnai