TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
3 62-3070—03
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. Fig. 6. Restrict wires to shad ed area of wire hole.
Table 2. Terminal Designation Descriptions.
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.
M19917
WALLPLATE
M22266
WALL OPENING
WIRE
SHADED AREA
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)
System Type
Wallplate
Terminal
Identifications
Wiring
Diagram
Figure
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
Conventional 12, 13
Heat Pump
(No Auxiliary Heat)
Heat Pump 14, 15
Heat Pump
(with Auxiliary Heat)
Heat Pump 16, 17
Multiple T7770A Sensors — 18, 19, 20
Multiple C7189U Sensors — 21