Rinnai RHFE-557FT Manual page 16

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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 heat a rwm to the pre-set temperature by the prcqmmmed
On
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 understanding of the Pre-heat function.
TIME ELAPSED FROM IGNITION TO PRESET TEMPERATURE
:-
i
i
I
:
Colder than usual :
:
I
I
I
I
i I
I
j:OO
:
ipLizz&J>
I
I
7;oo
I
:
:
I
I
I Programmed time
:
:
I Later than average ignition
I Average starting time
: Earlier than usual ignition
kmm temperature sensed
Recorded by Micro Computer
1; )
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