Honeywell VISIONPRO TB8220U Installation Instructions Manual page 3

3. Insert the wires into the terminal block and tighten
each screw terminal. See Fig. 5.
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.
Terminal Designation
Rc (see Note 1)
R (see Note 1)
Y
C (see Note 2)
W
G
W2
Y2
O/B (see Note 3)
A (see Note 4)
S1 (See Note 5)
S2 (See Note 5)
L
W1
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.
TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
M19917
Table 2. Terminal Designation Descriptions.
Power for cooling—connect to secondary side of cooling system transformer.
Power for heating—connect to secondary side of heating system transformer.
Compressor output.
Common wire from secondary side of cooling system transformer.
Heat relay.
Fan relay.
Second stage heat relay.
Second stage cooling.
Changeover valve for heat pumps.
Economizer/Time-Of-Day (TOD) output—powered via R terminal.
Optional outdoor or indoor remote sensor.
Optional outdoor or indoor remote sensor.
Powers red LED behind plastic in upper right corner of the thermostat.
Auxiliary Heat Relay Output (Head Pump Mode 2H/1C, 3H/2C)
WIRE
WALL OPENING
SHADED AREA
Fig. 6. Restrict wires to shaded area of wire hole.
Description
— 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.
System Type
Standard Heat/Cool
Heat Only
Heat Only with Fan
Cool only
Standard Multistage
up to 2 Heat/2 Cool
Heat Pump
(No Auxiliary Heat)
Heat Pump
(with Auxiliary Heat)
Multiple TR21 Sensors
Multiple C7189U Sensors
3
WALLPLATE
M22266
Wallplate Wiring
Terminal Diagram
Identifications Figure
Conventional 7, 8
Conventional 9
Conventional 10
Conventional 11
Conventional 12, 13
Heat Pump 14, 15
Heat Pump 16, 17
— 18, 19, 20
— 21
62-3070—07