Honeywell PRO 4110D Programmable Thermostat Installation Guide
Installation Guide
Wiring
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Wiring
Keep wires in this
shaded area
1
2
3
Loosen screw terminals, insert
wires into terminal block, then re-
tighten screws.
Push excess wire back into the
wall opening. Keep wires in shaded
area as shown at left.
Jumper
Plug the wall opening with non-
flammable insulation to prevent
drafts from affecting thermostat
operation.
Terminal
block
Terminal Designations
W
Heat relay.
Y Compressor contactor.
G Fan relay.
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system.
O Heat pump changeover valve ener-
gized in cooling.
Rc Cooling power. Connect to
secondary side of cooling
system transformer.
Heat pump systems
If wiring to a heat pump, use a small piece of
wire (not supplied) to connect terminals W
and Y.
R Heating power. Connect to
secondary side of heating
system transformer.
C terminal
The C (common wire) terminal is optional
when thermostat is powered by batteries.
B Heat pump changeover valve ener-
gized in heating.
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
C Common wire from secondary side
of cooling system transformer.
4
| General | Details |
|---|---|
| Name | Honeywell PRO 4110D Programmable Thermostat Installation Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.6 MB |
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