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8 Rinnai Corporation ES38 Manual
Operating the Heater
Turning the heater ON
When you press and release the
ON/OFF button, the Temperature
Level lamps will illuminate, the
combustion fan will begin to run,
and the spark will ignite the main
burner.
This heater has an automatic ignition system. When
the main burner has lit, the combustion lamp will glow
red, and the spark will stop.
If ignition does not occur after 15 seconds, the
appliance will automatically turn off and the
Temperature Level lamps will flash indicating a fault
code. This may occur when using the appliance for
the first time or if it has not been used for a while. Try
operating the appliance again.
There may be a smell of burning dust or oil the first
time the heater is lit or when the heater has been out
of operation for a long time.
The appliance may make noises after ignition or when
it is turned off. This is normal and is due to the
thermal expansion or contraction of its components.
Adjusting the Temperature
The first time that the appliance is turned on, the
preset temperature of 72° F will be shown on the
display. Every time the temperature setting is
changed, that temperature setting will be the latest
data appearing on the display the next time the
appliance is turned on.
To change the temperature setting, adjust the
temperature control buttons until the desired setting is
indicated.
When the desired temperature has been set, 10
seconds later, the display will show the current room
temperature.
The thermostat automatically modulates the burner
and the fan to maintain the temperature setting.
The temperature settings available are:
• LO - burner is on minimum combustion
• 60° F - 80° F in two degree increments
• HI - burner is on maximum combustion
Turning the heater OFF
Press the ON/OFF button. Do not
turn off by unplugging at the power
outlet.
The fan will continue to run for a
short time to prevent the internal
components from overheating.
ON/OFF
Economy Mode
Pressing the Economy button will cause
the appliance to go into Economy Mode
and the green lamp will glow. This
results in the temperature setting being
reduced by 2° F, 30 minutes after the
room temperature has reached the
temperature setting. After another 30
minutes the temperature setting is
reduced another 2° F. This could result
in the temperature setting being reduced by a
maximum of 4° F. The intent of this mode is to save
energy.
When the heater is running at the LO setting, the
Economy Mode does not function.
Economy
ON/OFF
Set Tem p
Ro o m Te m p
Temp
Control
Function Lock