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keypad to prevent unauthorized
tampering with the program. Two
levels of security are available, Total
Keypad Lockout or Partial Keypad
Lockout. Total Keypad Lockout
renders all buttons inoperative. Partial
Keypad Lockout allows only the
or to operate for temporary
temperature overrides. It also limits the
temperature to the maximum heating
and minimum cooling temperatures
used in your program. This is espe-
cially useful in buildings where
unscheduled events are common.
Anyone can change the temperature,
but only between the temperatures you
set and only for the number of hours
you specify if you set up your Hold
Till timing (see “Temporary Program
Override” (page 15). To select or
deselect this feature, refer to the
CONFIGURATION section (page 6,
Keypad Lock menu).
Activate RUN PRG by Telephone.
(User menu, Item 9) With the optional
X-10 Telephone Responder, Model
TR551, and Universal Low Voltage
Module, UM506, installed, you can
make a telephone call to run your
program if the thermostat has been set
to Hold or Vacation Hold. These items
are available from Radio Shack.
Compressor Run Time and
Auxiliary Run Time.
(User menu, Item 10 and 11) You can
see how long the compressor has run
(in hours) by viewing the User table,
Item 10. You can see how long the
system Auxiliary has run (in hours) by
viewing the User table, Item 11. These
can be reset to 00 when displayed by
pressing
and at the same
time.
Keypad Lockout.
(Keypad Lockout table) This security
feature allows you to lock out the
TRADITIONAL FEATURES
Automatic Changeover.
If you have a heating/cooling system,
the thermostat can be set to automati-
cally switch the system between
heating and cooling as needed. To set
your thermostat to this operating mode,
press
SYSTEM
button until AUTO is
displayed on the screen.
Factory Preprogrammed Times
and Temperatures.
This thermostat has been programmed
at the factory. The chart in the
programming examples section lists
these factory settings. If the times and
temperatures are the same as your
schedule, you may simply run the
factory installed program by pressing
PROGRAM
RUN
.
Compressor Short-Cycle
Protection.
Your thermostat is designed to protect
your system against premature
Features