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XT500C DELUXE PROGRAMMABLE HEAT-PUMP THERMOSTAT
WIRES
THROUGH WALL
WALL
ANCHORS
(2)
Fig. 2. Mounting the wallplate.
2. Use a pencil to mark the mounting holes. See Fig. 2.
3. Remove the wallplate from the wall and drill two 3/16
inch holes in the wall (if drywall) as marked. For firmer
material such as plaster, drill two 7/32 inch holes.
Gently tap anchors (provided) into the drilled holes until
flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
Pub. No. 18-HD25D2-2
69-1404
WALL
MOUNTING
HOLES
MOUNTING
SCREWS
M15044
THERMOSTAT
B
Y
Y2
G
O
COMPRESSOR
FAN
CONTACTOR 1
COMPRESSOR
SWITCHOVER
CONTACTOR 2
VALVE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 3. Typical hookup of XT500C in a heat pump system.
WIRING
All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 for typical hookup diagram. A letter
code is located near each terminal for identification.
WARNING
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or cause equipment
damage.
Disconnect power before wiring to prevent electrical
shock or equipment damage.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 4.
NOTE: Use 18 gauge, color-coded thermostat cable for
proper wiring.
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
Fig. 4. Proper wiring technique.
X2
W
R
F
H
H
HUMIDISTAT
OPENS ON RISE
EM. HT.
TAYSTAT253A
RELAY
2
AUX.
DEFROST
HEAT
CONTROLLER
RELAY
TRANSFORMER
2 FEATURE NOT AVAILABLE
ON ALL SYSTEMS.
2
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M4826
OT
OT
OUTDOOR
TEMPERATURE
SENSOR
TAYSENS100A
L1
1
L2
M17108
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