Installation - Carrier Programmable Dual Fuel Thermostats Installation, Start-Up, And Operating Instructions Manual

WIRING SYSTEM
DIAGRAM TYPE
1-speed HP
Fig. 2
1-stage furnace
1-speed HP
Fig. 3
2-stage furnace
2-speed HP
Fig. 4
1-stage furnace
2-speed HP
Fig. 5
2-stage furnace

INSTALLATION

NOTE: All TSTAT models do not have batteries and are not
"power stealing". They do require 24VAC (R and C terminals) to
be connected for proper operation. Thermostat will not operate
without these 2 connections.
Step 1—Thermostat Location
Thermostat should be mounted:
• Approximately 5 ft (1.5m) from floor.
• Close to or in a frequently used room, preferably on an inside
partitioning wall.
• On a section of wall without pipes or duct work.
• In a location where the outdoor temperature sensor wires can be
routed to thermostat location. It is acceptable to use 2 separate
wires in thermostat cable to connect outdoor sensor. These
wires may be connected at furnace to another pair continuing to
outdoor heat pump. The outdoor sensor may then be mounted
and connected in vicinity of heat pump, but be sure it is not
located in direct sunlight.
Thermostat should NOT be mounted:
• Close to a window, on an outside wall, or next to a door leading
to the outside.
• Exposed to direct light and heat from a lamp, sun, fireplace, or
other temperature-radiating object which may cause a false
reading.
• Close to or in direct airflow from supply registers and return-air
grilles.
• In areas with poor air circulation, such as behind a door or in
an alcove.
Step 2—Set DIP Switches
There are 4 small switches on the back of the circuit board which
must be set by the installer. The ON position is indicated by small
letters on the switch itself. Ignore numbers 1-4 on the switch. The
switch designation (A through D) is on the circuit board next to the
switch. To change a switch position use the corner of a small
screwdriver to slide it between on and off. Make these selections
BEFORE installing the thermostat--it is much easier.
Switch A - Not Used in Dual Fuel Thermostats
This switch must be in OFF position in all dual fuel applications.
DO NOT turn ON.
Switch B - Setback Recovery
Selects between normal and smart recovery from setback. Normal
recovery changes to the new setpoint at the programmed time.
Smart recovery, which is active in heating mode only, starts earlier
and adjusts the setpoint slowly so that room temperature will arrive
at the programmed temperature at the programmed time.
TO SET:
OFF—for smart recovery. This is the factory default.
ON—for normal recovery.
Switch C - Disable Low-Ambient Cooling
Use to allow or prevent cooling operation below an outdoor
temperature of 55˚F. Prevention of cooling below 55˚F adds to
compressor reliability. If outdoor temperature sensor fails or is
Table 1—Heating Stages
OUTDOOR TEMP/
BAL. PT. TEMP
Above
Below
Above
Below Furnace Lo
Above
Below
Above
Below Furnace Lo or Hi
disconnected, cooling is allowed regardless of switch setting.
→
TO SET:
OFF—cooling is disabled at outdoor temperatures below 55˚F.
ON—cooling is allowed at outdoor temperatures below 55˚F.
Switch D - Select Single-Speed or 2-Speed HP
Use this switch to tell dual fuel thermostat whether it is controlling
a single- or 2-speed HP. It must be set properly.
TO SET:
OFF—for single-speed HP.
ON—for 2-speed HP.
→
Step 3—Install Thermostat
Before installing thermostat, turn off all power to unit. There
may be more than 1 power disconnect. Electrical shock can
cause personal injury or death.
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
NOTE: Mercury is a hazardous waste and MUST be disposed of
properly.
3. Open thermostat rear door (mounting base) to expose mount-
4. Route thermostat wires through large hole in mounting base.
5. Drill two 3/16-in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 screws and anchors
7. Adjust length and routing of each wire to reach proper
8. Match and connect equipment wires to proper terminals of the
3
STAGE 1 STAGE 2
HP Furnace
Furnace —
HP Furnace Lo
Furnace Hi
HP Lo HP Hi
Furnace —
HP Lo HP Hi
—
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, 1 at a time. Be
careful not to allow wires to fall back into the wall.
c. As each wire is disconnected, record wire color and
terminal marking.
d. Discard or recycle old thermostat.
ing holes. The base can be removed to simplify mounting.
Snap apart carefully at hinge to separate mounting base from
remainder of thermostat.
Level mounting base against wall (for aesthetic value
only—thermostat need not be leveled for proper operation)
and mark wall through 2 mounting holes.
provided, (additional anchoring holes available for more
secure mounting if needed) making sure all wires extend
through hole in mounting base.
terminal and connector block on mounting base with 1/4 in. of
extra wire. Strip only 1/4 in. of insulation from each wire to
prevent adjacent wires from shorting together when con-
nected.
connector blocks. (See Fig. 2 through 5.) Both R and C must
be connected for proper thermostat operation.
STAGE 3
—
—
Furnace Hi
—
Furnace
—
Furnace Lo or Hi
—