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FocusPRO
™
TH6110D Programmable Thermostat
5
Installation Guide
4
Wiring
1 Loosen screw terminals, insert
wires into terminal block, then
re-tighten screws.
2 Push excess wire back into the
wall opening. Keep wires in shaded
area as shown at left.
3 Plug the wall opening with non-
flammable insulation to prevent
drafts from affecting thermostat
operation.
Terminal Designations
GG
Fan relay.
WW OO//BB
Heat relay or changeover valve
terminal for heat pumps.
CC
Common wire from secondary side
of cooling system transformer.
YY
Compressor contactor.
RR
Heating power. Connect to
secondary side of heating
system transformer.
RRcc
Cooling power. Connect to
secondary side of cooling
system transformer.
Terminal
block
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system
.
C terminal
The C (common wire) terminal is optional
when thermostat is powered by batteries.
W (O/B) terminal
If thermostat is configured for a heat pump
in the Installer Setup, configure changeover
valve for cool (“O” factory setting) or heat
(“B”).
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
Keep wires in this
shaded area
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Wiring
Typical 1H/1C system: 1 transformer Typical 1H/1C system: 2 transformers
Power supply. Provide disconnect means and overload protection as required.
Factory-installed jumper. Remove for 2-transformer systems only.
Optional 24VAC common connection.
In Installer Setup, set system type to Heat Only
.
In Installer Setup, set system type to Heat Pump & changeover valve to 0 or B.
Remove jumper
Wiring diagrams
Typical 1H/1C heat pump system Typical heat-only system