Wiring - Honeywell PRO TH3210D Installation Manual

Installation Guide

Wiring

CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Keep wires in this
shaded area
Terminal
block
NOTES
C terminal
The C (common wire) terminal is optional
when thermostat is powered by batteries.
L terminal
Heat pump reset. L terminal is powered con-
tinuously when thermostat is set to Em Heat.
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
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
E E
Emergency heat relay.
A A u u x x Auxiliary heat relay.
Y Y Compressor contactor.
G G
Fan relay.
O O Heat pump changeover valve
energized in cooling.
L L Heat pump reset.
R R
Power wire from secondary
side of system transformer.
B B
Heat pump changeover valve
energized in heating.
C C
Common wire from secondary
side of system transformer.
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