Honeywell TB8220U User Manual
TB8220U
Commercial VisionPRO™
Programmable Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The TB8220U Programmable Thermostat provides electronic control of 24 Vac heating and cooling systems.
See Table 1 for a description.
Table 1. TB8220U Thermostat Description.
Feature Description
Powering Methods • Battery only
System Types • Conventional (up to 2 Heat, 2 Cool stages)
Changeover Manual or automatic changeover (selectable)
System Setting Heat-Off-Cool-Auto
Fan Setting Auto-On
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check ratings given in instructions and on the
product to ensure the product is suitable for your
application.
• Direct connection to a 24 Vac transformer only
• Direct connection to a 24 Vac transformer with battery backup
• Heat Pump (up to 3 Heat, 2 Cool stages)
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Select Thermostat Location
Select a location for the thermostat about 5 ft (1.5m)
above the floor in an area with good air circulation at
average temperature. See Fig. 1.
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
4. Remove the wallplate from the wall and drill two
3/16 in. holes in the wall (if drywall) as marked. For
firmer material such as plaster, drill two 7/32 in.
holes. Tap the wall anchors (provided) into the
drilled holes until flush with the wall.
NO
YES
NO
NO
5 FEET
[1.5 METERS]
M22258
5. Pull the wires through the wire hole on the wallplate
and position the wallplate over the wall anchors.
6. Insert the mounting screws into the wall anchors
and tighten.
Fig. 1. Select thermostat location.
Do not install the thermostat where it can be affected by:
— Drafts or dead spots behind doors and in corners.
— Hot or cold air from ducts.
— Radiant heat from sun or appliances.
— Concealed pipes and chimneys.
— Unheated (uncooled) areas such as an outside wall
behind the thermostat.
MOUNTING
HOLES
MOUNTING
SCREWS (2)
Separate Wallplate from Thermostat
1. Separate the wallplate from the thermostat. See
Fig. 2.
WALLPLATE
WIRE HOLE
THERMOSTAT
M22267
Fig. 2. Separate wallplate from thermostat.
Install Wallplate (See Fig. 3)
Mount the thermostat horizontally on the wall:
1. Pull the wires through the wire hole on the wallplate.
2. Position the wallplate on the wall with the arrow
pointing up. Level the wallplate for appearance only.
3. Use a pencil to mark the mounting holes.
WIRING
IMPORTANT
— All wiring must agree with applicable codes,
ordinances and regulations.
— Use 18 gauge thermostat wire. Shielded cable is
not required.
NOTES:
— Sensor wires must have a cable separate
from the thermostat control cable.
— Refer to Table 2 for terminal designation
descriptions.
— See Fig. 7 through 17 for wiring diagrams for
specific equipment applications.
1. Select set of terminal identifications that correspond
to your system type (conventional or heat pump).
(See Fig. 4).
Y2
L
A
W1
S1
S2
Fig. 4. Terminal identifications for system type.
2. Loosen screw terminals used for the application.
WALL
WIRES THROUGH WALL
AND WIRE SLOT
WALL ANCHORS (2)
Fig. 3. Install wallplate.
HEAT PUMP
CONVENTIONAL
RC
Y2
R
L
W
A
Y
W2
G
S1
C
S2
SCREW
TERMINALS
RC
R
O/B
Y
G
C
M22780A
M19916
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
3. Insert the wires into the terminal block and tighten
each screw terminal. See Fig. 5.
M19917
WIRE
WALLPLATE
Fig. 5. Insert wires into terminal block.
4. Push excess wire back into the wall opening and
restrict wires to the shaded area. See Fig. 6.
5. Plug the wall opening with nonflammable insulation
to prevent drafts from affecting the thermostat.
WALL OPENING
SHADED AREA
Fig. 6. Restrict wires to shaded area of wire hole.
Table 2. Terminal Designation Descriptions.
Terminal Designation Description
Rc (see Note 1) Power for cooling—connect to secondary side of cooling system transformer.
R (see Note 1) Power for heating—connect to secondary side of heating system transformer.
Y Compressor output.
C (see Note 2) Common wire from secondary side of cooling system transformer.
WHeat relay.
G Fan relay.
W2 Second stage heat relay.
Y2 Second stage cooling.
O/B (see Note 3) Changeover valve for heat pumps.
A (see Note 4) Economizer/Time-Of-Day (TOD) output—powered via R terminal.
S1 (See Note 5) Optional outdoor or indoor remote sensor.
S2 (See Note 5) Optional outdoor or indoor remote sensor.
L Powers red LED behind plastic in upper right corner of the thermostat.
W1 Auxiliary Heat Relay Output (Head Pump Mode 2H/1C, 3H/2C)
NOTES:
1. When used in a single-transformer system,
leave metal jumper wire in place between Rc
and R. If used on a two-transformer system,
remove metal jumper wire between Rc and R.
2. Common wire is optional when thermostat is
used with batteries. When using separate
transformers for heating and cooling, the
common must come from the cooling
transformer.
3. If thermostat is configured for a heat pump in
the Installer Setup, configure changeover
valve for cool (O-factory setting) or heat (B).
4. Reference economizer literature for wiring
details. When set for economizer operation,
the A terminal provides the occupancy signal.
(Power indicates occupied.)
5. Sensor wires must have a cable separate
from the thermostat control cable.
Terminal “A” Wiring Details for Economizers
— Wire the A terminal to the W7212 “N” terminal, or the
W7459 “TR” terminal.
— When using dual transformers at the thermostat, the
heating transformer must power the economizer.
— The A signal is powered from the R terminal and
energizes the economizer to signal occupied status
and drive the damper to the set minimum position.
Table 3. Wiring Diagrams.
Wallplate
System Type
Terminal
Identifications
Standard Heat/Cool Conventional 7, 8
Heat Only Conventional 9
Heat Only with Fan Conventional 10
Cool only Conventional 11
Standard Multistage
up to 2 Heat/2 Cool
Heat Pump
(No Auxiliary Heat)
Heat Pump
(with Auxiliary Heat)
Conventional 12, 13
Heat Pump 14, 15
Heat Pump 16, 17
Multiple T7770A Sensors — 18, 19, 20
Multiple C7189U Sensors — 21
M22266
Wiring
Diagram
Figure
3 62-3070—03
TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
Conventional System Wiring
Y2
Y2
RC
L
A
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
ECONOMIZER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
Fig. 7. Typical wiring of single transformer
Y2
L
A
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
ECONOMIZER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL. WHEN USED, THE COMMON MUST CONNECT
TO THE COOLING TRANSFORMER SECONDARY.
Fig. 8. Typical hookup of dual transformer
2
R
W
Y
G
C
FAN RELAY
COMPRESSOR CONTACTOR
HEAT RELAY
1H/1C system.
RC
2
2
R
W
Y
G
C
FAN RELAY
COMPRESSOR CONTACTOR
HEAT RELAY
1H/1C system.
24 VAC
3
24 VAC
3
24 VAC
1
L1
(HOT)
L2
M22781A
1
L1
(HOT)
L2
1
L1
(HOT)
L2
M22782A
OUTDOOR/INDOOR
Fig. 10. Typical hookup of heat-only system with fan.
L
A
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION IS
OPTIONAL.
Fig. 9. Typical hookup of heat-only system.
Y2
L
A
W2
S1
S2
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
Y2
L
A
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
ECONOMIZER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
Fig. 11. Typical hookup of cool-only system.
RC
2
2
R
W
Y
G
C
HEAT RELAY
ECONOMIZER
RC
2
R
W
Y
G
C
FAN RELAY
HEAT RELAY
ECONOMIZER
RC
2
R
W
Y
G
C
FAN RELAY
COMPRESSOR CONTACTOR
3
24 VAC
24 VAC
3
24 VAC
3
L1
(HOT)
L2
M22783A
1
L1
(HOT)
L2
M22784A
1
L1
(HOT)
L2
M22785A
1
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
Y2
RC
L
A
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
ECONOMIZER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
Fig. 12. Typical hookup of single transformer
multistage system (up to 2H/2C).
2
R
W
Y
G
C
COOL RELAY 2
24 VAC
3
FAN RELAY
COOL RELAY 1
HEAT RELAY 1
Y2
1
L1
(HOT)
L2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
ECONOMIZER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
REMOVE FACTORY INSTALLED JUMPER.
3
M22786A
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL. WHEN USED, THE COMMON MUST CONNECT
TO THE COOLING TRANSFORMER SECONDARY.
Fig. 13. Typical hookup of dual transformer multistage
RC
L
A
W2
S1
S2
2
R
W
Y
G
C
COOL RELAY 2
system (up to 2H/2C).
FAN RELAY
COOL RELAY 1
HEAT RELAY 1
3
24 VAC
24 VAC
1
L1
(HOT)
L2
1
L1
(HOT)
L2
M22787A
5 62-3070—03
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