Wiring; Terminal Designation - Honeywell TH5110D Installation Instructions Manual

WIRING

All wiring must comply with local electrical codes and
ordinances. Refer to Table 2 for descriptions of terminal
designations. See Fig. 6-13 for wiring diagrams for
specific equipment applications.
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before wiring.
IMPORTANT
Use 18-22 gauge thermostat wire. Shielded
cable is not required.
1. Loosen the screw terminals that are used for the
application. Insert the wires into the terminal block
and tighten each screw terminal. See Fig. 4.
WIRES
TERMINAL BLOCK
SCREW TERMINALS
LETTER
DESIGNATIONS
R
C
R
Y
C
O/B W
G
Fig. 4. Insert wires into terminal block.
Terminal
Designation
Rc (see Note 1)
R (see Note 1)
Y
C (see Note 2)
O/B W (see Note 3)
G
NOTES:
1. When used in a single-transformer system, leave metal jumper in place between Rc and R. If used on a
two-transformer system, remove metal jumper between Rc and R.
2. Common wire is optional when thermostat is used with batteries.
3. If thermostat is configured for a heat pump in the Installer Setup, configure changeover valve
for cool (O-factory setting) or heat (B).
WALLPLATE
RC
R
Y
W/O/B
G
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 contactor
Common wire from secondary side of cooling system transformer
Heat relay or changeover valve terminal for heat pumps
Fan relay
TH5110D NON-PROGRAMMABLE THERMOSTAT
2. Push excess wire back into the wall opening and
restrict wires to the shaded area. See Fig. 5.
(O/B)
Fig. 5. Restrict wires to shaded area of wire hole.
3. Plug the wall opening with nonflammable insulation
to prevent drafts from affecting the thermostat.
M22141
Description
3
WALLPLATE
WALL OPENING
Rc
R
Y
C
W
G
SHADED AREA
WIRE
M22142
69-1712—1