Honeywell Th4210D ユーザーズマニュアル
Installation Guide
4
Wiring
1
Loosen screw terminals, insert
wires into terminal block, then re-
tighten screws.
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.
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.
flammable insulation to prevent
drafts from affecting thermostat
operation.
Terminal Designations
E
E
Emergency heat relay.
A
Au
ux
x
Auxiliary heat relay.
Y
Y
Compressor contactor.
G
G
Fan relay.
O
O
Heat pump changeover valve
energized in cooling.
energized in cooling.
L
L
Heat pump reset.
R
R
Power wire from secondary
side of system transformer.
side of system transformer.
B
B
Heat pump changeover valve
energized in heating.
energized in heating.
C
C
Common wire from secondary
side of system transformer.
side of system transformer.
Terminal
block
block
NOTES
C terminal
The C (common wire) terminal is optional
when thermostat is powered by batteries.
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.
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.
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
Keep wires in this
shaded area
shaded area
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Disconnect power before wiring.
Wiring