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EX17DT and EX22DT Installation and Operation Manual 31
The Lock feature will help to prevent accidental
operation of the furnace and to prevent
children from operating the furnace.
To activate Lock, press the Lock button. The
indicator will light and a beep will sound.
To deactivate Lock, press the Lock button and
hold for about 2 seconds. The indicator light
will go out and a beep will sound.
The lock can be activated when the
furnace is ON or OFF.
If activated while the furnace is ON, all
controls other than the OFF switch will be
locked.
If activated while the furnace is OFF, then
all controls will be locked.
If the furnace is turned off while the Lock is
activated, it cannot be turned on again until
the lock is deactivated.
Deactivating the lock releases the control
buttons.
1. Press the “Program” button.
2. The light next to “Clock” should be
flashing. Press the up and down arrows to
set the time. Holding down either of the
arrow keys will change the time more
quickly.
3. Press the “Program” button until none of
the time options are flashing.
1. Turn the furnace on by pressing the “ON/
OFF” button.
2. Press the up or down arrows to set the
temperature. The left side of the display
shows the temperature setting. The right
side of the display shows the room
temperature.
5.4.2 Lock
5.4.4 Operate the Furnace
Manually
5.4.3 Set the Clock
Figure 32
Figure 33
Figure 34
Figure 35
Figure 36
The thermostat automatically modulates the
burner and the fan to maintain the
temperature setting.
The temperature settings available are:
L - burner is on minimum combustion
60-80ºF (16-26°C) in 2ºF (1°C)
Increments
H - burner is on maximum combustion
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