Carrier A07051 User manual

T C --- PA C , T C --- N A C
T C --- P H P, T C --- N H P
ComforttSeries Thermostats
Installation Instructions
A07051 A07050
Comfort Series Comfort Series
Programmable Thermostat Non ---Programmable Thermostat
NOTE: Read the entire instruction manual before starting the installation.

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TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 3....................................
INTRODUCTION 4..............................................
INSTALLATION CONSIDERATIONS 4..............................
INSTALLATION 5...............................................
Step 1 — Thermostat Location 5...................................
Step 2 — Install Thermostat 6......................................
Step 3 — Set Thermostat Configuration 10...........................
Step 4 — Check Thermostat Operation 18............................
FEATURES AND ACCESSORIES 19................................
OPERATIONAL AND CONNECTION INFORMATION 21..............
WIRING DIAGRAMS 24..........................................
THERMOSTAT CONFIGURATION RECORD 25......................
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Follow all local electrical
codes during installation. All wiring must conform to local and national electrical
codes. Improper wiring or installation may damage thermostat.
Recognize safety information. This is the safety--alert symbol . When you see
this symbol on the equipment and in the instruction manual, be alert to the
potential for personal injury.
Understand the signal words DANGER,WARNING,andCAUTION.These
words are used with the safety--alert symbol. DANGER identifies the most
serious hazards which will result in severe personal injury or death. WARNING

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signifies a hazard which could result in personal injury or death. CAUTION is
used to identify unsafe practices which may result in minor personal injury or
product and property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
INTRODUCTION
Carrier’s ComforttSeries programmable thermostats are wall--mounted,
low--voltage thermostats which maintain room temperature by controlling the
operation of a heating and/or air conditioning system. Both heat pump and air
conditioner models are available, each in programmable and non--programmable
versions. A variety of features are provided including battery operation, separate
heating and cooling setpoints, auto changeover, keypad lockout, backlighting,
and built--in installer test. Programming features include 7--day (all days the
same) and 5/2 (Mon--Fri and Sat--Sun) with 2 or 4 periods per day.
This Installation Instruction covers installation, configuration, and startup of all
four versions of the Comfort Series line of thermostats. For operational details,
consult the Owner’s Manual for the specific thermostat you are installing.
INSTALLATION CONSIDERATIONS
Models
There are four models in the Comfort Series: programmable and
non--programmable, AC and HP. Models TC--PAC and TC--NAC are designed for
AC systems, controlling one stage of cooling and one stage of heating. They will not
operate a heat pump. Models TC--PHP and TC--NHP are designed for HP systems,
controlling one stage of cooling and two stages of heating. They can be converted to
AC operation. Select the appropriate model for the intended application.

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Power
All Comfort Series models are dual powered. They can operate from batteries or
24VAC power. Operation from 24VAC is preferred if available. Battery
operation is used when there are not enough wires to support 24VAC operation
or when “armchair programming” is desired. For an AC system, 5 wires are
needed for 24VAC operation and as few as 2 wires are sufficient for battery
operation. For a HP system, 6 wires are needed for 24VAC operation and 5 wires
are sufficient for battery operation. When battery operation is used, the C
terminal does not need to be connected.
Provision is also made for separate heating and cooling transformers via separable
Rc and Rh terminals which are connected via factory--installed jumper wire.
INSTALLATION
Step 1 — Thermostat Location
SApproximately 5 ft (1.5m) from floor.
SClose to or in a frequently used room, preferably on an inside
partitioning wall.
SOn a section of wall without pipes or duct work.
Thermostat should NOT be mounted
SClose to a window, on an outside wall, or next to a door leading to the
outside.
SExposed to direct light or heat from the sun, a lamp, fireplace, or other
temperature--radiating objects which could cause a false reading.
SClose to or in direct airflow from supply registers and return--air
registers.

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SIn areas with poor air circulation, such as behind a door or in an
alcove.
Step 2 — Install Thermostat
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing thermostat, turn off all power to equipment.
There may be more than 1 power disconnect.
!WARNING
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
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.

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ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Mercury is a hazardous waste. Federal regulations require that
Mercury be disposed of properly.
CAUTION
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3. Open thermostat (mounting base) to expose mounting holes. The base
can be removed to simplify mounting. Press the thumb release at the top
of the thermostat and snap apart carefully to separate mounting base from
remainder of thermostat.
4. Route thermostat wires through large hole in mounting base. Level mounting
base against wall (for aesthetic value only—thermostat need not be level for
proper operation) and mark wall through 2 mounting holes. See Fig. 1.
A07153
Fig. 1 -- Backplate Mounting

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5. Drill two 3/16--in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 anchors and screws provided
(additional anchoring holes available for more secure mounting if needed)
making sure all wires extend through hole in mounting base.
7. Adjust length and routing of each wire to reach proper 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 connected. See Fig. 2.
A07155
Fig. 2 -- Secure Wires to Terminal Strip
8. Match and connect equipment wires to proper terminals of the connector
blocks (see Fig. 3). If there are separate 24VAC transformers, one in the
indoor unit and one in the outdoor unit, connect the common of each to the
C terminal. Remove factory--installed jumper wire from Rc and Rh terminals.
Connect the R from the indoor unit to the Rh terminal. Connect the R from
the outdoor unit to the Rc terminal. Then the W and G signals are taken from
the Rh power and the Y and O signals are taken from the Rc power.

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O/B - reversing valve
Not used
Rc - 24 VAC, from cooling equipmen
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Rh - 24 VAC, from heating equipmen
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W - Heating
C - Common 24 VAC
G - Fan
Y - Cooling
A07159
Fig. 3 -- Terminal Designations
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Improper wiring or installation may damage the thermostat.
Check to make sure wiring is correct before proceeding with
installation or turning on unit.
CAUTION
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9. Push any excess wire into wall and against mounting base. Seal hole in
wall to prevent air leaks. Leaks can affect operation.
10. Snap case back together. Attach thermostat to backplate by inserting tab
on bottom edge and hinging up until top snap secures. See Fig. 4.

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A07157
Fig. 4 -- Attach Comfort Series Programmable Thermostat
11. Close thermostat assembly making sure pins on back of circuit board
align with sockets in connector.
12. Turn ON power to unit.
When power is applied, all display icons are lit for 2 seconds to test the display.
Following this, the equipment type for which the thermostat is configured is
displayed for an additional 2 seconds. It will be one of HP, AC, H, PH, PC or C (see
explanation under Step 3, Option 01 below). A HP thermostat configured to operate
an AC (see Option 1 below) will display AC. An AC thermostat cannot display HP.
NOTE: If a common wire has not been connected, two AA batteries must be
used to power the thermostat.
Step 3 — Set Thermostat Configuration
Configuration options enable the installer to configure the thermostat for a particular
installation. Most are not presented to the homeowner and therefore must be properly