Rinnai ENERGYSAVER EX08C Installation Fundamentals page 19

Clock, Timer, and Setback Functions
(C-Series)
Setback allows a minimum temperature to be pre-set and maintained between timer events
or while the unit is turned off.
• This feature's primary function is to slightly reduce the temperature (and gas usage) during
extended periods of nonuse or inactivity—such as sleeping or when the home is empty.
• NOTE: When this feature is used as a setback function for energy savings, it is not advisable to reduce
setback more than 4-6°F from the regular set point. This could cause the ENERGYSAVER
more gas to return to the set point and cancel any savings achieved.
• This feature can also be used as frost protection during longer periods of vacancy (such as
in a second home). For this use the setback temperature can be set as low as 38°F.
• Even when off, if the setback feature is engaged, the setback temperature will be maintained.
• If power is lost and setback is ON, it will be ON at the resumption of power.
The following example shows how, when used together, the timer and setback functions can
maximize comfort and efficiency:
• Daily schedule:
• Occupants wake at 5am
• Home is empty from 9am until 4pm
• Occupants are asleep from 11pm until 5am
12am 2am 4am
Between timer events,
the Setback temp of
66°F is maintained
6am 8am
10am
Timer 1 Between timer events, the Setback
70°F temp is temperature of 66°F is maintained
maintained
• Operation temperature is set to 70°F
• Timer 1 is set from 5am to 9am
• Timer 2 is set from 4pm to 11pm
• Setback is set to 66°F
12noon 2pm 4pm
to use
®
6pm 8pm 10pm
Timer 2
70°F temp is maintained
12am
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