Rinnai Energysaver RHFE-1004FTR, How To Use Manual, Page: 16 / 36

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PRE-HEAT FUNCTION
This function is called Pre-heat due to the way it operates. The room temperature is sensed one hour
before reaching the programmed time of either Timer.
The temperature differential at the time of sensing the room temperature combined with the data from
the previous operation governs exactly how long before the programmed ON time the micro-computer
will operate the heater and ignite the burner.
The following chart may help to improve your understanding of the Pre-heat function.
1
This function operates automatically in conjunction with either of the Timers. When a Timer is
selected, the heater may operate anywhere within an hour prior to the programmed starting time
of the Timer. The Pre-heat function will automatically heat a room to the pre-set temperature by
the programmed ON-Time. (ie. Heater will come on earlier to ensure desired temperature is
reached by the programmed time.)
Room temperature sensed
Earlier than usual ignition
Average starting time
Later than average ignition
Programmed time
6:00 6:30 7:00
Warmer than usual
Colder than usual
TIME ELAPSED FROM IGNITION TO PRESET TEMPERATURE Recorded by Micro Computer