4
Fig. 6—Keep wiring restricted to ribbed area
surrounding terminals.
FOR STRAIGHT
INSERTION –
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND –
STRIP 7/16 in. [11 mm]
RESTRICT
WIRING TO
THIS AREA
WIRING TO BE BELOW
THIS SURFACE
TOP SURFACE
OF SUBBASE
FRONT VIEW OF
TERMINAL AREA
CROSS-SECTIONAL VIEW OF
TERMINAL AREA
M3062
Fig. 7—T8631R cycle rate adjustment.
M3063A
1A
2A
2B
1B
NORMAL
FASTER
1B
IN
OUT
1 TURN
(FACTORY
SETTING)
DISPLAY TEMPERATURE
2B
o
C
F
o
OUT
IN
NOT USED
2B
CYCLE RATE
AUXILIARY HEAT
Fig. 8—T8631A cycle rate adjustment.
SYSTEM
GRAVITY
AIR/WATER
HOTa
WATER
GAS/OIL
WARM AIR
ELECTRIC
WARM AIR
1A
OUT
1 TURN
OUT
1 TURN
OUT
1 TURN
OUT
1 TURN
1B
IN
IN
(FACTORY SETTING)
IN
IN
M3064A
1A
1B
2A
2B
DISPLAY TEMPERATURE
2B
o
C
F
o
OUT
IN
2B
2A
OUT
IN
2A
RECOVERY OPTION
ADAPTIVE
CONVENTIONAL
HEAT
CYCLE RATE
aSOME HIGH EFFICIENCY FURNACES OPERATE BETTER IF ADJUSTED
TO HOT WATER SETTING.
CYCLE RATE ADJUSTMENT
NOTE: MOST APPLICATIONS WILL NOT REQUIRE
A CHANGE IN CYCLE RATE.
The room air temperature will normally vary slightly
from the comfort temperature setting with the cycling of
the heat pump, auxiliary heater, furnace or air conditioner.
The cycle rate of the T8631R Thermostat is factory-set for
heat pumps. The heat pump compressor cycle rate can not
be adjusted. The auxiliary heat cycle rate can be adjusted
by turning the cycle rate adjustment screw located on the
back of the thermostat. See Fig. 7.
T8631A has a factory-set cycle rate of six cycles per
hour in heating and three cycles per hour in cooling. For
high efficiency furnaces, it can be necessary to change the
cycle rate to the hot water setting. Cooling cycle rate is not
adjustable, but heating can be adjusted by turning one or
both 1A and 1B screws on the back of the thermostat. See
Fig. 8 for adjustments. The screw should only be backed
out about one-half turn, or be turned in until tight.
ADAPTIVE INTELLIGENT RECOVERY™/CON-
VENTIONAL RECOVERY CONVERSION
The T8631A and T8631R are factory-set for Adaptive
Intelligent Recovery™, but the T8631A can be converted
to Conventional Recovery by using the screw 2A on the
back of the thermostat as indicated in Fig. 8.
With the Adaptive Intelligent Recovery setting, 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.
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. A
■
will appear on the display when using Conven-
tional Recovery.
TEMPERATURE CONVERSION
The display readout can be converted between
°
C and
°
F using screw 2B. See Figs. 7 and 8.
HBUS SWITCH
The subbase has a switch that you can move to disconnect
the thermostat from the external control device. See Fig. 2.
INSTALLING BATTERIES
Three AAA alkaline batteries are provided as backup to
prevent program loss in event of power outage. Batteries
are included with thermostat. Install batteries in back of
thermostat. See Fig. 9.
Without battery backup, the program will remain about
20 seconds in event of power loss.
Fig. 9—Battery placement.
BATTERY PLACEMENT
(NOTE CORRECT PLUS
AND MINUS DIRECTION)
M3058