Honeywell Thermostat T8112d1005 (1) Manual

PRODUCT DATA
¨ U.S. Registered Trademark
Copyright © 1998 Honeywell Inc.   ¥   All Rights Reserved
T8112D
Programmable Thermostat
GENERAL
The T8112D Programmable Thermostat provides energy
savings for single-stage heating and cooling applications
while providing reliable, precise temperature control.
FEATURES
¥ HEAT-OFF-COOL System switch.
¥ AUTO-ON Fan switch.
¥ Separate programs for weekdays and weekends
(5 day/2 day).
¥ Digital LCD display.
¥ Easy to program and install.
¥ Precise temperature...

T8112D PROGRAMMABLE THERMOSTAT
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SPECIFICATIONS
IMPORTANT
The specifications given in this publication do notinclude normal manufacturing tolerances; therefore,an individual unit might not exactly match the listed
specifications. Also, this product is tested andcalibrated under closely controlled conditions, andsome minor differences in performance can be
expected if those conditions are changed.
Model:
T8112D Thermostat: Provides electronic programmable
control for 24 to 30 Vac heating and...

T8112D PROGRAMMABLE THERMOSTAT
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3
INSTALLATION
When Installing this ProductÉ
1. Read these instructions carefully. Failure to follow the
instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on the
product and in the compatibility chart (Table 1) to make
sure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as...

T8112D PROGRAMMABLE THERMOSTAT
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Fig. 3. Proper wiring technique.
M1712A
JUMPER (FACTORY-
INSTALLED) REMOVE 
IF 5-WIRE SYSTEMINSERT
STRAIGHT 
UNDER 
SCREW HEAD
5/16 in. 
(8 mm)
STRIP 
END OF WIRE 
VISIBLE HERE
R
R
c WY G
Fig. 4. Holding thermostat while installing.
M3002A
Fig. 5. 2-wire heat-only application (jumper intact).
RRc W      Y      G
B               D A               C
2-WIRE HEAT-ONLY (JUMPER INTACT)
M1709B
L1
(HOT)
L2
POWER SUPPLY.  PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS...

T8112D PROGRAMMABLE THERMOSTAT
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5
Fig. 8. 5-wire heat/cool application (jumper removed).
Adjust Fan Operation Switch, as Required
The thermostat fan operation switch, labeled FUEL SWITCH
(see Fig. 9) is factory set in the F position. This is the correct
setting for most systems. If you have an electric heat system,
set the switch to E. In systems with the G terminal connected,
the E setting turns on the fan immediately with heating or
cooling.
RRc W      Y      G
B               D A...

T8112D PROGRAMMABLE THERMOSTAT
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Fig. 10. Removing battery door.
M5781
Fig. 11. Installing batteries.
Mounting Thermostat
     1.  Engage the tabs at the top of the thermostat and
mounting plate. See Fig. 12.
     2.  Press the lower edge of the case to latch.
NOTE: To remove the thermostat from the wall, first pull out
the bottom of the thermostat and then remove the
top portion.
Fig. 12. Mounting thermostat on mounting plate.
INSTALL TWO AA ALKALINE 
BATTERIES AS SHOWN
M5782
Auto   OnFan  Cool...

T8112D PROGRAMMABLE THERMOSTAT
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To check the current temperature setting:
Press the Run Program key. (When using TEMPORARILY
CHANGE or HOLD, pressing this key will cancel the change
or hold.)
To check the programs:
     1.  Press the Schedule key repeatedly to see each time
and temperature.
     2.  Press the Run Program key.
To cancel a program:
     1.  Press the Schedule key until the program to cancel
appears
     2.  Press both the Time keys s and t together.
To permanently change a...

T8112D PROGRAMMABLE THERMOSTAT
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Home and Building Control
Honeywell Limited-Honeywell LimitŽe
155 Gordon Baker Road
North York, Ontario
M2H 3N7
68-0206  L.C. 2-98     Printed in U.S.A.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Printed on recycled paper containing at 
least 10% post-consumer paper fibers.
Minimum Off-Timer
A minimum off-timer for the T8112D assures that the cooling
compressor does not come on again for at least five minutes
after it...