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Fig. 7—CT8602C heating/cooling circuit in a two
transformer (one for heating, one for cooling)
system with gas heat and electric cooling, RC
and R terminals. Remove factory-installed R-RC
jumper.
W
G
1
L1
24V
(HOT)
L2
FAN RELAY
2
HEATING
PRIMARY
CONTROL
L1
1
(HOT)
24V
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
PRIMARY CONTROL SUCH AS GAS VALVE OR
ELECTRONIC IGNITION MODULE.
Fig. 8—CT8602C heating/cooling circuit in an oil
heating and electric cooling system. Heating
transformer is in oil primary, RC and R termi-
nals. Remove factory-installed R-RC jumper.
WALLPLATE
G
W
1
L1
(HOT)
FAN RELAY
T
T
L2
OIL PRIMARY
L1
1
(HOT)
24V
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 9—Adjustments.
RECOVERY
SELECTION
ADAPTIVE
(FACTORY SETTING)
INTELLIGENT ™
CONVENTIONAL
OUT 1/2 TO 1 TURN
3A 1A 1B
SYSTEM
1A
1B
GRAVITY
OUT 1/2
OUT 1/2
AIR/WATER
TO 1 TURN
TO 1 TURN
HOT
IN
OUT 1/2
WATER
TO 1 TURN
GAS/OIL
IN
IN
(FACTORY SETTING)
WARM AIR
ELECTRIC
OUT 1/2
IN
WARM AIR
TO 1 TURN
WALLPLATE
R
RC
Y
COOLING
CONTACTOR
M118
R
RC
Y
COOLING
CONTACTOR
M120
3A
IN
2A 2B
TIME/TEMP
DISPLAY
2A
2B
24 HR
IN
OUT 1/2
12 HR
TO 1 TURN
o
C
IN
OUT 1/2
o
F
TO 1 TURN
M8857
Setting and Adjustments
ADJUSTING CYCLE RATE
NOTE: MOST APPLICATIONS DO NOT REQUIRE A
CHANGE IN CYCLE RATE.
The room air temperature varies slightly from the com-
fort temperature setting with the cycling of the furnace or
air conditioner. The equipment cycles off and on as the
room temperature approaches the setpoint.
The cycle rate of this thermostat is set for heating at six
cycles per hour and for cooling at three cycles per hour as
shipped from the factory. The cooling cycle rate cannot be
adjusted. The heating cycle rate can be adjusted by turning
one or both cycle rate adjustment screws located on the
back of the thermostat. See Fig. 9. Back out the screw about
one-half to one turn, or turn in until tight.
ADAPTIVE INTELLIGENT RECOVERY™/
CONVENTIONAL RECOVERY
The thermostat is factory-set for Adaptive Intelligent
Recovery™, but can be converted to conventional recovery
using screw 3A on the back of the thermostat as indicated in
Fig. 9.
With Adaptive Intelligent Recovery™, the room reaches
the comfort temperature at the exact time programmed into
the thermostat. The control temperature increases gradu-
ally, and turns the equipment on and off several times to
reach the comfort temperature slowly and on time. There is
no wasted energy associated with rapid temperature changes
and temperature overshoot.
With conventional recovery, program the start time to
be earlier than the desired comfort time. It may require
some trial and error to arrive at the best starting time.
NOTE: If you adjust screw 3A for conventional recovery, an
indicator appears in the lower right corner of the thermo-
stat display as a reminder that the Adaptive Intelligent
Recovery™ feature is not active. (Fig. 10).
Fig. 10—Conventional recovery indicator.
TUE
LEAVE
INDICATES
THERMOSTAT IS SET FOR
CONVENTIONAL RECOVERY
SETTING TIME/TEMPERATURE
The display readout can be converted between a 12 and
24 hour clock or C and F using screws 2A and 2B as
indicated in Fig. 9.
INSTALLING BATTERIES
Power is supplied for the thermostat by three AA alka-
line batteries. Batteries are included with thermostat. Install
batteries in back of thermostat as shown in Fig. 11. The
display will flash 1:00 PM and room temperature.
When the batteries are going dead, the display will flash
REPL BAT. Set system switch to OFF. Remove the ther-
mostat from the wall and install three new AA alkaline
batteries. We recommend Energizer
3
SET
PM
PT
M8878
®
batteries. Change
69-0446—2
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