Honeywell PRO TH4110D User Manual download pdf (Page 6)

Installation Guide

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

Heat relay.

Compressor contactor.

Fan relay.

Heat pump changeover valve ener-

gized in cooling.

RRcc

Cooling power. Connect to

secondary side of cooling

system transformer.

Heating power. Connect to

secondary side of heating

system transformer.

Heat pump changeover valve ener-

gized in heating.

Common wire from 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

Heat pump systems

If wiring to a heat pump, use a small piece of

wire (not supplied) to connect terminals W

and Y.

C terminal

The C (common wire) terminal is optional

when thermostat is powered by batteries.

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

Jumper

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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Honeywell PRO TH4110D User Manual Page 6

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