69-0309—9
7
T8602A,B,C,D AND TS8602A,C Chronotherm
®
III FUEL SAVER THERMOSTATS
With Adaptive Intelligent Recovery™, the room will reach
the comfort temperature at the exact time programmed
into the thermostat. The control temperature will increase
gradually, and turn the equipment on and off several times
to reach the comfort temperature slowly and on time.
There will be no wasted of energy associated with rapid
temperature changes and temperature overshoot.
With conventional recovery, the start time should be
programmed to be earlier than the desired comfort time. It
may require some trial and error to arrive at the best
starting time.
Setting Time/Temperature (Some Models)
The display readout may be converted between a 12 and
24 hour clock or
°
C and
°
F using screws 2A and 2B as
indicated in Fig. 16.
Setting Fan Operation
Some T8602C models include a fan operation switch on
the back of the thermostat on the lower left corner. See
Fig. 15. See Table 2 to determine correct setting of fan
operation switch.
CAUTION
The fan operation switch, which is available on
some T8602C models, is factory set to the NON
ELEC. position. If the system requires direct
thermostat control of the fan in heat mode, the
switch must be set to the ELEC. position. See
Table 2.
Table 2. T8602C Fan Operation Switch Setting.
Installing Batteries
Power is supplied for the thermostat by three AA alkaline
batteries. Batteries are included with thermostat. Install
batteries in back of thermostat as shown in Fig. 17. The
display will flash 1:00 PM and room temperature.
When the batteries are going dead, the display will flash
REPL BAT. If device has system switch, set to OFF.
Remove the thermostat from the wall and install three new
AA alkaline batteries. We recommend Energizer®
batteries. Change batteries within approximately 30
seconds from the time the batteries are removed to
prevent program loss and the necessity to reprogram.
IMPORTANT
The low battery warning will be displayed about
two months before the batteries are dead. When
the batteries are dead, the system will shut down.
After batteries are replaced, thermostat will
require reprogramming.
Mounting The Thermostat
Hang the thermostat on the tabs at the top of the base.
See Fig. 18A. Swing down and press on the lower edge
until the thermostat snaps into place. See Fig. 18B. Open
the cover, and tighten the captive mounting screws. See
Fig. 18C.
Setting Day and Time
Set the present day and time. When the thermostat is first
turned on, the display will read 1:00 PM and the room
temperature. It will go off for only a few seconds, then
begin to flash on and off.
Press .
Press TIME or to set the current
time.
Press .
Press to set the current day. Each press of the
DAY key advances the display one day.
If the display will not come on:
•
Check mounting of thermostat to wallplate. If loose or
misaligned, remove thermostat and reinstall on the
wallplate, making sure it is firmly attached.
•
Check to see that all the batteries are good and
installed correctly.
SET
PRESENT
DAY/TIME
AHEAD
Fan Operation
Fan Operation
Switch Setting
(4A)
Comments
Fan controlled
directly by
thermostat in heat
mode (typically
electric furnaces).
Set to ELEC.
position.
Use only one
system
transformer
jumper R and
RC.
Fan has
independent
control in heat
mode (typically
gas, oil, millivolt
and some electric
furnaces).
Set to NON
ELEC. position
System may
have one or two
transformers;
if one
transformer,
jumper R and
RC.
SET
PRESENT
DAY/TIME
DAY
BACK
M2083
BATTERY
PLACEMENT
(NOTE CORRECT PLUS
AND MINUS DIRECTION)
Fig. 17. Battery placement.