Carrier TC -PAC User manual

T C --- P A C , T C --- N A C
T C --- P H P, T C --- N H P
Comfort™ Series
AC / HP Thermostat
Installation Instructions
A07051 A07050
Comfort Series Comfort Series
Programmable Thermostat Non--Programmable Thermostat
Designed and Assembled in the U.S.A.
NOTE: Read the entire instruction manual before starting the installation.
US patents: US20060165149 A1, USD582803 SI, USD582802 SI

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TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2................................
INSTALLATION CONSIDERATIONS 4..........................
INSTALLATION 5...........................................
Step 1 — Thermostat Location 5...............................
Step 2 — Install Thermostat 5..................................
Step 3 — Set Thermostat Configuration 10.......................
Step 4 — Check Thermostat Operation 18........................
FEATURES AND ACCESSORIES 20............................
OPERATIONAL AND CONNECTION INFORMATION 22..........
WIRING DIAGRAMS 25......................................
THERMOSTAT CONFIGURATION RECORD 32..................

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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 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.

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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 start--up 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.

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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 two stages of
cooling and three stages of heating. They can be converted to AC operation. Select the
appropriate model for the intended application.
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, up to six wires are needed
for 24VAC operation and one less wire for battery operation. For a HP system, up to
seven wires are needed for 24VAC operation and one less wire would be sufficient
for battery operation. For heat only operation with batteries, only two wires are
required. 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.

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INSTALLATION
Installation Notes:
SThe maximum wire size to be used in the installation is 22AWG
(0.50mm2)with 0.8mm insulation
SNo part of the control should be installed directly outdoors or in a cabin-
et outdoors
SThe control assembly should be mounted before wires are attached
Step 1 — Thermostat Location
SApproximately 5 ft (1.5m) from floor.
SClose to or in a frequently used room, preferably on an inside partition-
ing 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 re-
gisters.
SIn areas with poor air circulation, such as behind a door or in an alcove.

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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 one 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, one 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.
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
!
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

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thermostat and snap apart carefully to separate mounting base from re-
mainder 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 four mounting holes. To avoid unin-
tended bending of wall plate plastic, all four screws and anchors must be used.
See Fig. 1.
A07153
Fig. 1 -- Backplate Mounting
5. Drill four 3/16--in. mounting holes in wall where marked.
6. Secure mounting base to wall with four screws and anchors provided. To
avoid unintended bending of wall plate plastic, all four screws and anchors must
be used. Make sure all wires extend through hole in mounting base.

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7. Adjust length and routing of each wire to reach proper terminal and con-
nector block on mounting base with 1/4--in. (6 mm) 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 signal is taken from the Rh power and the Y1,
Y/Y2, G and O signals are taken from the Rc power.

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O/B - reversing valve
Y1 - Cooling
Low Stage
Rc - 24 VAC, from cooling equipment
Rh - 24 VAC, from heating equipment
W - Heating
C - Common 24 VAC
G - Fan
Y/Y2 - Cooling High or Single Stage
A09271
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
!
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, H2, AC, A2, H 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 set
by the installer. (Only those marked with an asterisk * below are available to the
homeowner.) Following is a list of the options available, an explanation of their function,

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and their factory default settings. Not all numbers are used in the Comfort Series
because not all options are available in this series -- and numbering is consistent across
the TB, TC, and TP thermostat lines.
Configuration Options -- Summary:
Option 01 -- Equipment type
Option 03* -- Fahrenheit/Centigrade
Option 04 -- Fan (G) on with W output
Option 07 -- Zoning
Option 10 -- Reversing valve
Option 11 -- Minimum deadband between heating and cooling setpoints
Option 12 -- Smart Recovery (programmable models only)
Option 13 -- Room air temperature offset adjustment
Option 15 -- Auto Changeover availability
Option 16 -- Maximum cycles per hour
Option 17 -- Time between equipment stages
Option 18* -- Continuous backlighting
Option 21* -- Keypad lockout
Option 24* -- Programmable/non--programmable (programmable models only)
Option 25* -- Number of programmable periods per day
Option 26 -- Minimum cooling setpoint
Option 27 -- Maximum heating setpoint
Option 99 -- Reset to factory defaults
Those options marked with an asterisk are also adjustable by the homeowner. See
Owner’s Manual for further information.

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To Enter the Configuration Mode:
Press and hold the FAN key for about 10 seconds until the display changes so that
only two pairs of digits are showing. The left (programmable version) or the large
upper (non--programmable version) display shows the configuration number and
the right (programmable version) or small lower (non--programmable version)
shows the configuration setting. Configuration number will be flashing which
means it can be adjusted using the UP and DOWN keys. To cause the opposite pair
to flash (to be adjustable), press the MODE key. Successive presses of the MODE
key alternate between the configuration number and the configuration setting. To
exit the configuration mode, press the FAN key. If no key is pressed for 3 minutes,
the configuration mode will automatically exit, returning the thermostat to normal
operation.
Configuration Options -- Selection:
Option 01 -- Equipment type
Selections: with HP thermostat: HP, H2, AC, A2, H, C
with AC thermostat: AC, H, C
HP controls 1 speed heat pump with 1 stage of aux heat.
A2 controls two stages of cooling and one stage of furnace heat.
H2 controls a 2 Speed HP with 1 stage of aux heat.
AC controls 1 speed air conditioner with 1 stage of heat.
H operates a heat only system: furnace or fan coil only; no outdoor unit.
C operates a cool only system: outdoor AC unit with an indoor fan coil; no strip
heater support.
Note that this option allows a HP thermostat to be converted to control an AC
system.

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Option 03 -- Fahrenheit/Centigrade
Selections:
F = Fahrenheit — Default is Fahrenheit.
C = Centigrade.
Selects temperature measurement units.
Option 04 -- Fan (G) ON with W output
Selections:
OF = G not energized with W — This is default.
ON = G energized with W.
This selection determines whether the fan (G) is to be ON or OFF when the W
(furnace or strip heat) is ON. Furnaces and fan coils which manage their own
blowers do not require a separate G signal. Some auxiliary heaters require a
separate G signal to operate the blower when W is applied.
Option 07 -- Zoning
Selections:
OF = non--zoned system — This is default.
ON = zoned system.
ON disables thermostat’s internal timers which are not needed with zoning system
controls. Must be set to OF for non--zoned systems.
Option 10 -- Reversing valve
This selection is only available on heat pump systems. “O” terminal can be
configured to be energized in either heating mode or in cooling mode, depending
on heat pump operation. “O” is used to describe a heat pump system that energizes
its reversing valve in cooling. “B” is used to describe a heat pump system that
energizes its reversing valve in heating.

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H — Reversing valve output (O/W2/B) is energized when HEAT mode is selected.
C — Reversing valve output (O/W2/B) is energized when COOL mode is selected.
Default is C.
Option 11 -- Minimum Deadband Between Heating And Cooling
Selections:
01 through 06 — Default is 02.
Sets the minimum allowable number of degrees between heating and cooling
setpoints. One setpoint will “push” the other to maintain this difference.
Option 12 -- Smart Recovery (programmable model only)
Selections:
OF, 30, 60, 90 — Default is 90.
Smart Recovery OF means setpoints change immediately at a program schedule
change. Thirty, 60, or 90 selects the number of minutes recovery starts before
programmed recovery time. Recovery takes place smoothly during the selected
recovery time, ending at the recovery time and temperature which is programmed.
If the setpoint is changed during smart recovery, the smart recovery is cancelled and
the new setpoint is effective immediately. Not available with non--programmable
thermostats.

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Option 13 -- Room Air Temperature Offset
Selections:
--5to5_F—Defaultis0.
This option selects the number of degrees F to be added to the displayed
temperature to calibrate or deliberately miscalibrate the measured room
temperature.
Option 15 -- Auto Changeover Availability
Selections:
ON—Thisisdefault.
OF
ON allows automatic changeover between heating and cooling as demand requires.
OF maintains either heating or cooling mode only. Auto changeover is not available
when H or C is selected under Option 1.
Option 16 -- Maximum Cycles Per Hour
Selections:
2, 4, or 6 — Default is 4.
The maximum cycle rate is limited by internal timers to the selected number of
cycles per hour. Selection of a higher number causes faster cycling resulting in
more constant room temperature.
Option 17 -- Minimum Time Between Equipment Stages
Selections:
10, 15, 20, 25 — Default is 15.
When there is an auxiliary stage of heat available, this is the amount of time the
heat pump must operate before the aux stage can turn on. With heat pumps, longer
times can reduce the amount of auxiliary heat used. Not available with AC
thermostats.

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Option 18 -- Backlight Configuration
Selections:
ON, OF — Default is OF.
When ON is selected and the thermostat is not battery operated a low level
continuous display backlight is always on. With OF selected, the backlight is only
on for a short time after the door is opened or a key is pressed. Continuous
backlight is not available with battery operation.
Option 21 -- Keypad Lockout
Selections:
ON, OF — Default is OF.
With OF selected, the keypad cannot be locked. With ON selected the keypad will
be locked and can be unlocked by simultaneously pressing the UP and DOWN keys
for 5 seconds. Once unlocked, it will relock 2 minutes after the last keypad press. A
“lock” icon is displayed while it is locked.
Option 24 -- Programmable/Non--Programmable (programmable model only)
Selections:
P, nP — Default is P.
This option is only available on programmable models, allowing programming to
be disabled when nP is selected. The clock is displayed, but the program schedule,
the HOLD and TEMPORARY HOLD functions are disabled.
Option 25 -- Number of Programmable Periods (programmable model only)
Selections:
2, 4 — Default is 4.
Selecting 2 allows 2 programming periods, P1 and P2, per day. Selecting 4 allows
periods P1, P2 , P3, and P4. Not available with non--programmable thermostats.

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Option 26 -- Minimum Cooling Setpoint
Selections:
52_to 90_— Default is 52_F.
Sets the lowest cooling setpoint available to the user.
Option 27 -- Maximum Heating Setpoint
Selections:
50_Fto88_F—Defaultis88_F.
Sets the highest heating setpoint available to the user.
Option 99 -- Reset to Factory Defaults
Selection:
See below — There is no default.
Use this capability to reset the thermostat to “out of the box” conditions.
NOTE: All configuration settings, program settings, clock, and day which have
been manually entered will be lost!
When this option is selected, the configuration number (99), will appear on the left
and 10 will appear on the right. To perform the reset, first use the MODE key to
make the 10 flash. Then press and hold the DOWN key. The 10 will start counting
down toward zero. If the DOWN key is kept pressed until the count reaches zero,
the reset will be performed. If the DOWN key is released early, the number will
return to 10 and the reset will not occur.

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Step 4 — Check Thermostat Operation
The Comfort Series thermostats have a built--in installer test capability. Use it to
check thermostat and equipment operation without delays or setpoint adjustments
to force heating or cooling.
To enter the Installer Test mode, use the same process as is used to enter Installer
Configuration, only hold the FAN key longer. More specifically, press and hold the
FAN for about 15 seconds until the display reads In on the left and St on the right
for the programmable model, or InS in the smaller display for the
non--programmable model. The MODE will be OFF. The MODE key (upper left)
can now be used to select heat, cool, or emergency heat, if this is a HP thermostat.
Selecting one of the available modes will immediately command the equipment to
turn on in that mode. It will run for 3 minutes and then return the mode to off. With
HP thermostats (having 2 stages of heating), the test will run for 3 minutes on each
stage. If the thermostat is programmable, the clock display counts down from 180
seconds while each stage operates. Changing the mode to OFF will terminate any
running test immediately.
During any test, the display icons will be displayed the same as for normal
operation of that stage, as follows:
SELECTED MODE DISPLAY ICONS
off off
cool cool on, 2 (for second stage cooling)
heat heat on, aux heat on
Em Heat aux heat on
To terminate the Installer Test mode press the DONE or FAN button. If the
thermostat is left in Installer Test mode, it will revert back to normal operation after
15 minutes.