Honeywell T8195B Thermostat User Manual

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T8195B/Q682B,C,Y8224A  
Heating or Cooling and Heating/Cooling  
New Construction Thermostat,  
Wallplate and Subbase  
Installation Instructions for the Trained Service Technician.  
Preparation  
Recycling Notice  
Check thermostat and subbase (if used) suitability for the  
heating, cooling, or heating/cooling system. Refer to Table 1.  
Assemble tools required: flat bladed screwdriver, hand or  
power drill with 3/16-in. drill bit, wire cutter/stripper or  
sharp knife, bubble level or plumb bob and line.  
Assure power is off to the heating, cooling, or heating/  
cooling system at the main fuse panel. Most buildings have  
a separate switch box or circuit breaker for disconnecting  
power to the heating and cooling (if applicable) equipment.  
This thermostat is compatible with most heating, cooling,  
or heating/cooling systems. Refer to Table 1 for thermostat  
and system compatibility information.  
This control contains mercury in a sealed tube. Do not  
place control in the trash at the end of its useful life.  
If this control is replacing a control that contains mercury  
in a sealed tube, do not place your old control in the trash.  
Contact your local waste management authority for in-  
structions regarding recycling and the proper disposal of this  
control, or of an old control containing mercury in a sealed  
tube.  
If you have questions, call Honeywell Inc. at 1-800-  
468-1502.  
TABLE 1—THERMOSTAT AND SYSTEM COMPATIBILITY.  
Type of Heating System  
to be Controlled  
Conditions/Compatibility  
Electric (Line Voltage)—typical  
baseboard and radiant  
•
The R8239D1015 Isolating Relay or R841 Silent Switching Center must be  
installed in the thermostat control circuit.  
a
Fan Coil Unit  
•
•
Compatible. Assure correct subbase identity is selected for fan control.  
Gas—Direct Spark Ignition  
Compatible. Assure that 24V control transformer common is accessible for  
connection to thermostat cable conductor and power to the transformer is not  
regularly interrupted by high temperature or limit operation.  
(
DSI), Intermittent Pilot (IP), and  
Standing Pilot (SP)  
Heat Pump  
•
Compatible. Assure correct subbase identity is selected for fan control and  
changeover control (O terminal for cool and B terminal for heat). Jumper Y  
to W for heat pump compressor control.  
Hot Water Zone  
•
•
Honeywell 2-wire valves are compatible.  
Some non-Honeywell 2-wire valves require an R8239D1015 Isolating Relay  
a
in the thermostat control circuit.  
•
•
Some 3-wire valves require an R8239A1052 Isolating Relay in the  
thermostat control circuit.  
a, b  
Oil  
Assure that the 24V control transformer common is accessible for connection  
to thermostat cable conductor and power to the transformer is not regularly  
interrupted by high temperature, purge cycle, or limit operation.  
Vent Damper  
•
•
Honeywell damper motors are compatible.  
Some non-Honeywell damper motors require an R8239D1015 Isolating  
a
Relay in the thermostat control circuit. Check control amperage  
requirement.  
Warm Air Zone  
•
Most are compatible.  
a
If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermo-  
stat will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell  
R841 or R8239D1015 Isolating Relay must be added to the thermostat control circuit.  
Consult manufacturer for installation requirements.  
b
D.F. • Rev. 11-94 • M3• ©Honeywell Inc. 1994 • Form Number 69- 0564—3  
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Installation  
Fig. 1—Unpack thermostat.  
WHEN INSTALLING THIS PRODUCT…  
. Read these instructions carefully. Failure to follow  
them could cause a hazardous condition.  
. Installer must be a trained experienced service technician.  
. After installation is complete, check out product op-  
CAPTIVE MOUNTING  
SCREWS  
THERMOSTAT  
COVER  
1
2
3
1
eration as provided in these instructions.  
IMPORTANT: An incorrectly leveled subbase will cause  
the temperature control to deviate from setpoint. It is  
not a calibration problem.  
LIFT  
COVER  
CAUTION  
THERMOSTAT BASE  
1
. Disconnect power supply to prevent electrical  
shock or equipment damage.  
REMOVE  
PACKING  
MATERIAL  
2
. Topreventinterferencewiththethermostatlink-  
age, keep wire length to a minimum and run  
wires as close as possible to the subbase.  
. Do not overtighten thermostat captive mount-  
ing screws because damage to subbase threads  
can result.  
M8605  
3
4
Drill 3/16-in. holes, and gently tap anchors into holes  
until flush with the wall.  
Pullwiresthroughthelargewiringholeinthewallplateor  
subbase.  
Loosely fasten the wallplate or subbase to the wall with  
the three screws. Do not completely tighten the screws.  
Carefully level the wallplate or subbase (Fig. 3), and  
firmly tighten the screws.  
. Do not short across coil terminals on relay. This  
can burn out the thermostat heat anticipator.  
LOCATION  
Locate thermostat about 5 ft [1.5m] above the floor in an  
area with good air circulation at average temperature.  
Do not mount the thermostat where it may be affected by:  
—
—
—
—
—
drafts, or dead spots behind doors and in corners.  
hot or cold air from ducts.  
radiant heat from the sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
Fig. 2—Mounting wallplate or subbase to wall.  
3
SCREW HOLES  
WITH PLASTIC  
ANCHORS  
Run wires from the heating, cooling, or heating/cooling  
equipment to the new thermostat location.  
IMPORTANT: This control requires an additional con-  
ductor to the control transformer common (e.g., a  
typical 2-wire heating system requires three wires be  
pulled, a 4-wire heating/cooling requires five wires).  
O
B
R
G
W
UNPACK THERMOSTAT  
Y
Handle your new thermostat carefully; rough handling  
may interfere with its accuracy. Before unpacking, refer to  
Fig. 1.  
FAN  
OFF COOL  
ON  
AUTO  
HEAT  
HEATING/COOLING SUBBASE  
M1552A  
Remove and discard the shipping wrap.  
IMPORTANT: Save package of screws and instructions  
3 SCREW HOLES  
WITH PLASTIC  
ANCHORS  
for the homeowner.  
Remove the thermostat cover by lifting from the bottom.  
Set aside cover until needed later.  
Carefully remove the material protecting the mercury  
HEATING-ONLY  
WALLPLATE  
switch bulb.  
Loosen two captive mounting screws, and separate wall-  
plate (if provided) from back of thermostat base.  
MOUNT WALLPLATE OR SUBBASE  
Wall Mounting (Fig. 2)  
Hold the wallplate or subbase in position on wall (Fig. 2).  
Mark holes on the wall for anchors. Use spirit level to  
make sure the wallplate or subbase is level.  
M857  
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WIRE WALLPLATE OR SUBBASE  
Fig. 3—Leveling methods for wallplate or  
subbase.  
Follow the instructions provided by the heating, cooling  
or heating/cooling equipment manufacturer. If not available,  
refer to the Typical Wiring Diagrams section at the end of  
this publication.  
Disconnect the power supply before making wiring con-  
nections to prevent electrical shock or equipment damage.  
SPIRIT LEVEL  
NOTE: All wiring must comply with local electrical codes  
and ordinances.  
PLUMB  
LINE  
O
Wallplate (Heating or Cooling Systems)  
Refer to Fig. 5 and strip the thermostat wire insulation as  
necessary.  
B
R
G
W
For heating-only systems, connect wires to R, W, and C  
terminals. For cooling-only systems, connect wires R, Y,  
and C terminals. Firmly tighten the screws. The system low-  
voltage transformer powers the timer (Fig. 11).  
Push excess wire back into the wall.  
Y
PLUMB  
BOB OR  
WEIGHT  
FAN  
OFF COOL  
ON  
AUTO  
HEAT  
M1555  
Plug the hole in the wall with nonhardening caulk, putty,  
or nonflammable insulation to prevent drafts from affecting  
thermostat operation.  
Outlet Box Mounting (Fig. 4)  
Use a horizontally mounted outlet box if possible. If a  
vertical outlet box is used, mount the wallplate or subbase on  
a 202689A Cover Plate Assembly (ordered separately). Fol-  
low the instructions provided with the cover plate assembly.  
Align the wallplate or subbase mounting holes on the  
outlet box and loosely fasten with two screws.  
Subbase (Heating/Cooling Systems)  
Refer to Fig. 5, and strip the thermostat wire insulation as  
necessary.  
Connect the wires to the corresponding terminals on the  
subbase. If labels do not agree with your new subbase, refer  
to Table 2 and the installation instructions furnished with  
the subbase.  
Carefully level the wallplate or subbase (Fig. 3), and  
firmly tighten the screws.  
Fig. 4—Mounting wallplate or subbase on horizontal outlet box.  
EXISTING  
EXISTING  
HORIZONTAL  
OUTLET BOX  
HORIZONTAL  
OUTLET BOX  
O
R
B
R
W
W
HEATING/  
G
COOLING  
SUBBASE  
WALLPLATE  
M856  
Y
FAN  
OFF COOL  
ON  
AUTO  
HEAT  
M1553A  
VERTICAL  
OUTLET  
BOX  
1
2
COVER  
PLATE  
ADAPTER  
RING  
2
O
B
R
W
G
Y
SUBBASE OR  
WALLPLATE  
MOUNTING  
SCREWS (2)  
1
2
NOT INCLUDED WITH UNIT.  
M1554A  
ACCESSORY PARTS AVAILABLE.  
3
69-0564—3  
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Fig. 5—Methods of connecting terminals.  
Fig. 6—Thermostat mounting.  
FOR STRAIGHT  
CONNECTION—  
STRIP 5/16 in. [8 mm]  
FOR WRAPAROUND  
CONNECTION—  
BARRIER  
TAB (2)  
STRIP 7/16 in. [11 mm]  
MOUNTING SLOT (2)  
M1556B  
1
TABLE 2—TERMINAL DESIGNATIONS.  
Subbase  
Terminal  
Control  
Function  
R
W
Y
Control transformer power.  
Heating control circuit.  
Cooling control circuit; jumper to W  
for heat pump compressor control if  
no P terminal on subbase.  
THERMOSTAT  
BASE  
WALLPLATE  
OR SUBBASE  
CAPTIVE  
MOUNTING SCREWS  
M8603  
G
C
O
Fan control circuit.  
Clock control (transformer common).  
Fig. 7—Insert timer backup batteries.  
Cooling damper or changeover/  
reversing valve, makes continuously  
in cool.  
BATTERY LOCATION FOR  
(2) AAA BATTERIES;  
INSTALL WITH POSITIVE  
ENDS UP  
B
Heating damper or changeover/  
reversing valve, makes continuously  
in heat.  
The timer is powered by the system low-voltage trans-  
former. 24 Vac must be maintained across terminals R and C.  
Push excess wire back into the wall.  
Plug the hole in wall with nonhardening caulk, putty, or  
nonflammable insulation to prevent drafts from affecting  
thermostat operation.  
M8585  
MOUNT THE THERMOSTAT  
Note the tabs on the top inside edge of the thermostat base.  
These tabs fit the slots molded into the top of the wallplate or  
subbase.  
Hang the thermostat base on the wallplate or subbase.  
Insert the two captive mounting screws located in the  
bottom corners of the base (Fig. 6).  
SET TIMER  
Adjust the clock by moving the knob clockwise  
not reverse the knob.  
When time is correctly set, the time indicator arrow  
(triangle shape) points to the corresponding daytime (light)  
or nighttime (dark) portion of the program dial.  
. Do  
Firmly tighten the screws.  
INSERT TIMER BATTERIES (OPTIONAL)  
Power is supplied to the clock by the 24-Vac transformer.  
Two AAA alkaline backup batteries (not included) may be  
installed to supply power to the timer if power is interrupted  
due to power failure.  
Install the batteries in the thermostat (Fig. 7).  
Once a year or when batteries are dead, replace with two  
new AAA alkaline batteries. We recommend Energizer®  
batteries.  
ATTACH THERMOSTAT COVER  
Make sure the packing inserts in the thermostat base are  
removed.  
Place the two tabs on the upper edge of the cover into the  
mounting slots in the thermostat base (Fig. 9).  
Swing the cover downward until it catches at the bot-  
tom of the base.  
6
9-0564—3  
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Fig. 8—Set timer.  
Fig. 9—Attach cover.  
PROGRAM  
PINS (4)  
50  
60  
70  
80  
SEE OWNER'S  
MANUAL FOR  
DETAILS  
TIMER  
SETTING  
KNOB  
TIME  
INDICATOR  
ARROW  
M8604  
Fig. 10—Temperature control levers.  
LOW TEMPERATURE  
(BLUE MARK)  
SET LEVER  
HIGH TEMPERATURE  
RED MARK)  
SET LEVER  
M5161  
(
SET TEMPERATURE CONTROL LEVERS  
The two levers on the top of the thermostat control the  
low and high temperatures for energy savings and comfort  
control (Fig. 10). The lever on the left (blue mark) controls  
the lower temperature. The lever on the right (red mark)  
controls the higher temperature.  
50  
60  
70  
80  
M859  
We recommend pushing the levers together at an appro-  
priate temperature for either heat or cool until the occupant  
programs the thermostat and makes the final temperature  
selections.  
Checkout  
SET SUBBASE SWITCHES (IF APPLICABLE)  
The subbase system switch controls system operation as  
follows:  
HEAT: Heating system is controlled by the thermostat.  
Cooling system is off.  
COOL: Cooling system is controlled by the thermostat.  
Heating system is off.  
CAUTION  
Do not check operation by shorting across termi-  
nals of system controls. This will damage the heat  
anticipator.  
OFF: Both the heating and cooling systems are off. If the  
fan switch is in the AUTO position, the fan is also off.  
The subbase fan switch controls fan operation as follows:  
ON: Fan operates continuously.  
AUTO: Fan operates with the cooling equipment as con-  
trolledbythethermostatorwiththeheatingequipment  
as controlled by the plenum switch. In electric heat,  
heat pump, and fan coil systems, the fan is controlled  
by the thermostat in heating and cooling.  
HEATING-ONLY SYSTEM  
Turn on power to the furnace.  
Push both temperature setting levers together at least 5° F  
3° C] above the room temperature. The main burner should  
[
come on. The fan will start when the furnace heats up.  
Move both levers 5° F [3° C] below the room tempera-  
ture. The burner should shut off.  
Operate the entire heating system at least one complete  
cycle.  
If thermostat fails any test, refer to the Troubleshooting  
Guide in the Owner’s Manual.  
Reset both the temperature setting levers to the desired  
To switch positions, use thumb or index finger to slide  
lever to the desired position. For proper circuit operation,  
switch lever must stop in detent over the desired function  
indicator mark.  
temperatures.  
5
69-0564—3  
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COOLING-ONLY SYSTEM  
Turn on power to the cooling equipment.  
Push both temperature setting levers together at least 5° F  
Operate the entire system for at least one complete cycle  
with the system switch at COOL and one complete cycle  
with the switch at HEAT.  
[3° C] below the room temperature. The cooling equipment  
If thermostat fails any test, refer to the Troubleshooting  
will operate, and the fan will start. Allow for any time delay  
Guide in the Owner’s Manual.  
that may be built into the compressor control circuit.  
Reset both the temperature setting levers to the desired  
temperatures.  
NOTE: To avoid compressor damage, do not operate the  
system when outdoor temperature is below 50°F [10°C].  
Refer to manufacturer recommendations.  
Leave Owner’s Manual and Assistance Information in a  
convenient place for the building occupant or provide with  
other appliance manuals.  
Move both levers 5° F [3° C] above room temperature.  
The cooling equipment and the fan should shut off.  
Operate the entire cooling system at least one complete  
cycle.  
If thermostat fails any test, refer to the Troubleshooting  
Guide in the Owner’s Manual.  
Typical Wiring Diagrams  
Follow the hookup diagram supplied with your heating,  
cooling, or heating/cooling equipment. If not available, use  
Figs. 11 through 13 as a guide.  
Reset both the temperature setting levers to the desired  
temperatures.  
REMEMBER: Your wiring must follow local electrical codes  
and ordinances.  
HEATING/COOLING SYSTEM  
Turn on power to the furnace and cooling system.  
Place the system switch lever to HEAT and fan switch  
lever to AUTO.  
Fig. 11—Typical hookup for T8195B Thermo-  
stat and Q682C Wallplate in gas heating  
control system.  
Push both temperature setting levers together at least 5° F  
3° C] above room temperature. The main burner should  
[
THERMOSTAT  
come on. The fan will start when the furnace heats up. (If  
central electric heat, fan coil or heat pump system, fan starts  
immediately.)  
TIMER  
Move both levers 5° F [3° C] below room temperature.  
The burner should shut off.  
H
H
PlacethesystemswitchlevertoCOOLandthefanswitch  
lever to AUTO. The cooling equipment will operate, and the  
fan will start. Allow for any time delay that may be built into  
the compressor control circuit.  
C
C
FALL  
FALL  
HEAT  
HEAT  
ANTICIPATOR  
ANTICIPATOR  
NOTE: To avoid compressor damage, do not operate the  
system when outdoor temperature is below 50°F [10°C].  
Refer to manufacturer recommendations.  
COOL  
ANTICIPATOR  
Move both temperature setting levers together at least  
° F [3° C] above the room temperature. The cooling equip-  
C
R
W
Y
5
ment should shut off.  
WALLPLATE  
GAS  
CONTROL  
Place the fan switch to ON. The fan should run continu-  
ously with the system switch in any position.  
Place the system switch to OFF. Move both temperature  
setting levers to various positions. The heating and cooling  
systems should not operate.  
L1  
HOT)  
L2  
(
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
M503A  
6
9-0564—3  
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Fig. 12—Typical hookup for T8195B Thermostat and Q682B Subbase in conventional heating/  
cooling system.  
TIMER  
H
C
H
C
THERMOSTAT  
HEAT/COOL  
ANTICIPATOR  
FALL  
FALL  
SYSTEM  
SWITCH  
2
SUBBASE  
FILTER  
LED  
FAN  
SWITCH  
C
R
B
O
G
W
Y
X
HEATING  
DAMPER  
COOLING  
DAMPER  
FAN  
RELAY  
HEAT  
RELAY  
COOLING  
RELAY  
1
SWITCH  
L1  
(
HOT)  
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
REMOTE INDICATION FOR FILTER OPTIONAL.  
M8606  
TIMER  
THERMOSTAT  
C
H
H
C
FALL  
HEAT  
ANTICIPATORS  
FALL  
COOL  
ANTICIPATORS  
SUBBASE  
SYSTEM  
SWITCH  
FAN  
SWITCH  
C
W
Y
G
R
HEAT  
RELAY  
COMPRESSOR  
CONTACTOR  
FAN  
RELAY  
L2  
1
L1  
(HOT)  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
M573B  
7
69-0564—3  
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Automation and Control Solutions  
Honeywell International Inc. Honeywell Limited—Honeywell Limitée  
985 Douglas Drive North  
Golden Valley, MN 55422  
1
35 Dynamic Drive  
Scarborough, Ontario M1V 4Z9  

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