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3.2 Fan Operating Mode
Use the selector switch to set the fan to automatic
mode (AUTO) or continuous mode (ON).
Note: This switch is not used in a 2-wire installation
as the fan is not connected to the thermostat in this
type of installation.
The fan operates only when the heating or cooling sys-
AUTO
tem is On (typical setting).
The fan operates continuously. Use this setting to
ON
improve air circulation and air cleaning.
3.3 Displaying the Temperature
The actual temperature is normally displayed. To view the setpoint,
press once on one of the
5 seconds along with the
Note: Pressing either of the
change the setpoint.
3.4 Setting the Temperature
Press one of the
buttons until the desired temperature is dis-
played.
3.5 Backlight
The display illuminates for 12 seconds when the backlight button or
either of the
buttons is pressed.
3.6 Thermostat Control Mode
3.6.1 Manual/Permanent Hold Mode
Maintains the temperature at a fixed setpoint. To place the thermo-
stat in this mode, press
[ Mode
3.6.2 Programmable Mode
Maintains the temperature according to the energy-saving sched-
ule. To place the thermostat in this mode, press
rent period will be displayed. The four possible periods are:
Wake up
Leave for work
To see the default program settings, see section 5.3.
Temporary Bypass
If you modify the setpoint (using the
stat is in Programmable mode, the thermostat will use the new set-
point for the next 2 hours. The house icon flashes during the
bypass. Afterwards the thermostat will return to the temperature set-
ting of the period currently underway.
3.7 Filter Replacement Indicator
After 500 hours of operation, an icon appears to indi-
cate that the filter needs replacement. Once the filter
is replaced, press
[ Filter ]
the icon and reset the counter.
3.8 Battery Replacement Indicator
Install fresh batteries immediately when the icon starts
flashing. The icon flashes for 120 days before the bat-
teries are depleted. You should replace batteries once
a year or before leaving home for more than a month
even if the icon has not appeared.
RTH2520
buttons. The setpoint is displayed for
icon.
buttons more than once will
]. The house icon will disappear.
[ Mode
Return home
buttons) when the thermo-
for 3 seconds to remove
After replacing the batteries, set the time, day and date (see sec-
tions 5.1 and 5.2). However, the temperature and program settings
are saved and do not need to be re-entered.
Warning: Before removing the batteries, place the
system switch on the thermostat to Off. Otherwise, the
heating/cooling unit might still be running even after
the batteries are removed.
4. Configuration Menu
DISPLAY
1
When Early Start is On, the thermostat determines when to start heating or cooling
so that the desired temperature is reached at the set time.
2
When this function is On, the thermostat automatically switches to daylight savings
time on the second Sunday of March and to normal time on the first Sunday of
November (see section 5.2).
3
Use the Heat/Cool selector switch to switch between the heating parameter and the
cooling parameter.
4
For optimal heating control, use the setting that matches your system as follows:
2=30 min (steam, gravity), 3=20 min (hot water, 90%+ high-efficiency furnace), 4=15
min (gas or oil), 5=12 min (alternate setting for gas or oil), 6=10 min (electric).
5
The corresponding cooling cycle lengths are: 2=30 min., 3=20 min., 4=15 min.,
5=12 min., 6=10 min.
To access the configuration menu, press the backlight button
for 3 seconds.
To go to the next parameter (menu item), briefly press the back-
light button.
]. The cur-
To modify a parameter, press
Repeat steps 2 and 3 if necessary.
Press the backlight button for 3 seconds to exit the configura-
tion menu.
Sleep
5. Programming
5.1 Setting the Time and Day
Press
[ Clk
Set the hour using
Press
[ Clk
Set the minutes using
Press
[ Clk
Set the day using
WE: Wednesday, TH: Thursday, FR: Friday, SA: Saturday and
SU: Sunday).
Press
[ Exit ]
5.2 Setting the Date
The date is needed for automatic daylight savings changeover.
Press
[ Clk ]
DESCRIPTION
Temperature display
Time display
1
Early start
Automatic daylight savings
2
changeover
3
Heating cycles per hour
3
Cooling cycles per hour
.
]. The hour flashes.
.
]. The minutes flash.
.
]. The day flashes.
. (MO: Monday, TU: Tuesday,
to exit.
for 3 seconds to display the year.
69-1867ES-03
DEFAULT
OPTIONS
°F
°C or °F
12 h
12 h or 24 h
Off
On or Off
Off
On or Off
4
4
2, 3, 4, 5 or 6
5
4
2, 3, 4, 5 or 6
11/09
3/4
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