2
XT300C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
69-1212—1
Pub. No. 18-HD25D1-3
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.
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
Electric 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.
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
M15044
MOUNTING
SCREWS
WALL
ANCHORS
(2)
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
Fig. 3. Typical hookup of XT300C in a heat-cool
system with one transformer.
Fig. 4. Proper wiring technique.
Cooling-Only Applications
The XT300C is only powered through the heating system.
Cooling-only applications require a simulated heating load
from the W terminal (see Fig. 3) to the transformer common.
Without this simulated load, the thermostat will not operate.
Mounting Thermostat
1. Engage tabs at the top of the thermostat and wallplate.
See Fig. 5.
2. Press lower edge of case to close and latch.
NOTE: To remove thermostat from wall, first pull out at
bottom of thermostat; remove top last.
Fig. 5. Mounting thermostat on wallplate.
G
L1
L2
M17114
FAN
RELAY
HUMIDISTAT
OPENS
ON RISE
TAYSTAT253A
Y R
COMPRESSOR
CONTACTOR 1
TRANSFORMER
HH
OUTDOOR
TEMPERATURE
SENSOR
TAYSENS100A
W
OT OT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
HEAT
RELAY 1
YELLOW
GREEN
WHITE
RED
M17109
PRESS LOWER
EDGE OF CASE
TO LATCH.
ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.
A.
B.
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