CARRIER Controls And HVAC Accessories Manual L0210355
User Manual: CARRIER CARRIER Controls and HVAC Accessories Manual CARRIER Controls and HVAC Accessories Owner's Manual, CARRIER Controls and HVAC Accessories installation guides
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HEATING & COOLING Programmable Dual Fuel Thermostats
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Installation, Start-Up, and Operating Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol --9 indicates a change since the last issue.
INDEX
Page
SAFETY CONSIDERATIONS ..................................................... 1
INTRODUCTION .......................................................................... I
SYSTEM CONSIDERATIONS .................................................... I
APPLICATION .............................................................................. 2
DESCRIPTION OF OPERATION ............................................ 2-3
INSTALLATION CONSIDERATIONS ....................................... 3
INSTALLATION ...................................................................... 3-12
Thermostat Location ................................................................. 3
Set DIP Switches ................................................................... 3-4
Install Thermostat ..................................................................... 4
Set Thermostat Configuration ............................................... 4-6
Check Thermostat Operation .................................................... 6
Final Settings ............................................................................ 7
Checklist .................................................................................... 7
WIRING DIAGRAMS ............................................................. 7-10
OPERATIONAL INFORMATION ............................................. 11
TROUBLESHOOTING ............................................................... 11
CONFIGURATION RECORD .................................................... 12
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 installa-
tion may damage thermostat.
Recognize safety information. This is the safety-alert symbol/b,.
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, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies a hazard which
could _sult in personal injury or death. CAUTION is used m
identify unsafe practices which would result in minor personal
injury or product and property damage.
INTRODUCTION
Carrier's 7-day programmable dual fuel thermostat is a wail-
mounted, low-vohage thermostat which provides proper control of
a heat purdp (HP) and furnace combination without using a
HP/fumace interface kit. Separate heating and cooling set points,
plus auto changeover allow setback programming for maximum
energy savings. Up.to 4time/temperature settings per 24 hour
period for 7independent days may be programmed. Batteries are
not required; during a power interruption, the internal memory
stores programs for an unlimited time and the clock continues to
run for at least 72 hrs.
--> SYSTEM CONSIDERATIONS
The dual fuel thermostat is designed to be used only in HP/furnace
installations. It replaces a conventional 2-stage HP thermostat and
a HP/furnace interface kit. An outdoor temperature sensor, Part
No. TSTATXXSEN01-B MUST be used with this thermostat. It is
supplied with thermostat.
As aa ENERGY STAR _, Carrier Corporation has
det*_ that this product meets the ENERGY STAR
guidellncs for energy efficiency.
f
J
A98426
HEIGHT (IN.) WIDTH (IN.) DEPTH (IN.)
4-1/4 7-1/2 1-3/8
--->Fig. l_arrier Programmable Thermostat
If HP is not already equipped with a high-pressure switch, one
must be added for dual fuel applications. It protects HP from
overpressure which would occur if a failure resulted in both
HP and furnace operating at same time. Kit No.
KSAHI0201HPS includes required switch and instructions
for its proper installation.
A HP/furnace installation has several special requirements. Fore-
most is that furnace and HP must not be allowed to operate at same
time, except during HP defrost. A second is to have furnace
complete a heating cycle once it is turned on. A third is the need
to have HP not operate at all when outdoor temperatures are below
a certain value. A fourth is to have the furnace not operate at all
when outdoor temperatures are above a certain higher value.
Finally, HP and furnace must work together properly to provide an
efficient and comfortable defrost. These requirements are ad-
dressed by the dual fuel thermostat itself and an interface kit is
NOT required.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without Incurring Obligations.
I'Tab misc_ misc_ PC 101 CatalogNO_03TS-TA9 Printedin U_S_A_ Foan TSTAT-18SI Pg 1 10-98 Replaces_TSTAT-9Si
--> APPLICATION
The dual fuel thermostat is designed for the following applications:
I-stage cool, 2-stage heat: 1-speed HP with 1-stage furnace
I-stage cool, 3-stage heat: l-speed HP with 2-stage fumaea
2-stage cool, 3-stage heat: 2-speed HP with l-stage furnace
2-stage coal, 4-stage heat: 2-speed HP with 2-stage furnace*
*This combination must use furnace algorithm to control furnace
staging.
Balance Point Temperature
The "balance point" temperature is a setting which affects the
operation of the heating mode. This is a field-selected input
temperature (range 5-55°F) where the dual fuel thermostat will
monitor outdoor air temperature and decide whether to enable or
disable the heat pump.
If the outdoor temperature is above the "balance point," the beat
pump will energize first to try to satisfy the indoor temperature
demand. If the heat pump does not make a sufficient improvement
within a reasonable time period (i.e. I5 minutes), then the gas
urnace will come on to satisfy the indoor temperature demand. If
he outdoor temperature is below the "balance point," the heat
}ump will not be allowed to operate (i.e. locked out), and the gas
_urnace will be used to satisfy the indoor temperature.
[here are three separate concepts which are related to selecting the
"inal "balance point" temperature. Read each of the following
:arefully to determine the best "balance point" in a dual fuel
nstallation:
2apacity Balance Temperature:
[his is the point where the heat pump cannot provide sufficient
:apacity to keep up with the indoor temperature demand because
ff declining outdoor temperature. At or below this point, the
"urnace is needed to maintain proper indoor temperature.
_.conomic Balance Temperature:
_bove this point, the heat pump is the most cost efficient to
}perate, and below this point, the furnace is the most cost efficient
o operate. This can be somewhat complicated to determine and it
nvolves knowing the cost of gas and electricity, as well as the
ffficieney of the furnace and heat pump. For the most economical
_peration, the heat pump should operate above this temperature
iassuming it has sufficient capacity), and the furnace should
)perate below this temperature.
Comfort Balance Temperature:
_Vhen the heat pump is operating below this point, the indoor
;upply air feels uncomfortable (i.e. too cool). This is purely
;ubjective and will depend on the homeowner's idea of comfort.
Below this temperature, the gas furnace should operate in order to
_atisfy the desire for indoor comfort.
_,uxiliary Heat Lockout Setting
l'he "auxiliary heat lockout" setting is an optional lockout feature.
l'his is in addition to the "balance point." The purpose of this
_eature is to lock out the gas furnace whenever the outdoor
:emperature is above the selected setting. The temperature range is
5-55°F. When the outdoor temperature is above the "auxiliary heat
ockout" setting, the heat pump will become the primary source,
fad the gas furnace cannot come on (except in defrost or
emergency heat mode).
Fhe "auxiliary heat lockout" setting can never be set below the
'balance point" setting, and likewise, the "balance point" can never
ae set above the "auxiliary heat lockout" setting. The range of each
_f these is from 5-55°F (or equivalent values in Celsius), or they
:an be turned off. When off, they do not limit the equipment
aperation. If the "auxiliary heat lockout" setting is moved down, it
will "push" the "balance point" so the two settings do not overlap.
Likewise, moving up the "balance point" will push the "auxiliary
heat lockout" setting.
When the two settings are the same, the system views this as a
single outdoor "balance point" temperature, and the heat pump is
used for above (warmer outdoor temperatures) and the furnace for
below (colder outdoor temperatures.)
DESCRIPTION OF OPERATION
Cooling Operatinn--Single Speed
HP cooling:
O/W2 energizes reversing valve to select cooling operation.
G energizes furnace blower.
Y/Y2 energizes compressor and selects high blower speed at
furnace.
When cooling demand is satisfied, G and Y/Y2 are de-energized.
O/W2 will remain on to minimize cycling of reversing valve. It
will turn off only when a call for heat occurs.
Cooling Operation Two Speed
Low-speed HP cooling:
O/W2 energizes reversing valve to select cooling operation.
G energizes furnace blower.
YI/W2 energizes compressor at low speed and may determine
furnace blower speed.
High-speed HP cooling:
Y/Y2 is added to low-speed cooling call to operate compressor at
high speed and increase blower speed.
Heating Operatiorv--Single-Speed HP
HP heating:
O/W2 remains off to select heating operation.
G turns on furnace blower.
Y/Y2 energizes compressor and increases furnace blower speed.
Heating Operatiorv--Two-Speed HP
Low-Speed HP heating:
O/W2 remains off to select heating operation.
G turns on furnace blower.
Y1/W2 turns on compressor at low speed and may also adjust
blower speed for low-speed HP operation.
High-Speed HP heating:
Y/Y2 is added to low-speed HP heating call to operate compressor
at high speed and adjust blower for high-speed HP operation.
Heating Operation_ingle-Stage Furnace
W/Wl causes furnace to operate. Furnace controls its own blower
at heating speed.
Heating Operation---Two-Stage Furnace Thermostat Control
Low heat:
W/Wl causes furnace to operate at low heat. Furnace controls its
own blower at low heating speed.
High heat:
YI/W2 is added to low-heat heating call to operate furnace in
high-heat mode. Furnace controls its own blower at high heating
speed.
Heating Operatiotr---Two-Stage Fumace_Algodthm Control
W/Wl causes furnace to operate. Based on amount of time it is
required to be on, it determines when to operate at low heat and
when to operate at high heat. It controls its own blower at proper
speed.
2
WIRING DIAGRAM
Fig. 2
Fig. 4, 6, 8
Fig. 3
Fig. 5, 7, 9
Table l_eating Stages
SYSTEM TYPE STAGE 1 STAGE 3
1-speed HP
1-stage furnace
1-speed HP
2-stage furnace
2-speed HP
1-stage furnace
2-speed HP
2-stage furnace
BALANCE POINT
SETnNG
Above
Below
Above
Below
Above
Below
Above
Below
HP
Furnace
HP
Furnace Lo
HP Lo
Furnace
HP Lo
Furnace LO or Hi
STAGE 2
Furnace
FurnaceLo
FurnaceHi
HP Hi
HP Hi
D
FurnaceHi
Fumace
FurnaceLOor Hi
Defrost Operation
Aunique feature of this thermostat is that adefrost cycle, once
started, will always be completed. This is true even if thermostat is
satisfied during defrost. The result is that a heating cycle never
begins with an uncompleted defrost and its associated "cold blow".
During operation of HP in heating mode, HP itself determines
when a defrost is necessary. It initiates defrost by energizing its O
and W wires. The signal on the O wire switches HP from heating
to cooling mode and W signal starts fumaee. Thermostat monitors
this action by sensing the signal (which it did not create) on the O
line. It responds by turning on its W outputs (both if 2-stage
furnace) to hold furnace on high heat. At completion of defrost,
indicated by removal of signal from HP on O wire, thermostat does
1 of 2 things. If it is satisfied, it turns off all Y, G, and W outputs
which results in all equipment off. If not satisfied, it will turn off
Y and G, leaving W on until it becomes satisfied. In this way it
assures that furnace will be used to satisfy a heat demand existing
after a defrost cycle is completed.
Emergency Heat
If EHEAT mode is selected at thermostat, all heating will be done
by furnace.
Continuous Fan
If FAN ON is selected, thermostat energizes G terminal, which
causes fan to operate when both heating and cooling are off.
Staging Sequence---Heating
Depending on whether HP is single or 2 speed and whether furnace
is single or 2 stage, the staging of thermostat outputs with
increasing demand varies. Table 1 shows the heating staging
sequence for all 4 possible combinations of single- and multi-stage
equipment. Note that thermostat itself has a maximum of 3 heating
stages. Note also that at outdoor temperatures below selected
balance point setting no HP operation is allowed. As discussed
earlier, once furnace is turned on, it remains on to satisfy all
demand.
A "freeze protect" feature is built into the dual fuel thermostat. If
indoor tempemture sensor fails, and thermostat is in HEAT or
AUTO mode, heat will be cycled when outdoor temperature is
below 50°F. The amount of heat supplied will increase as outdoor
temperature decreases, keeping structure from lieezing.
--_ INSTALLATION CONSIDERATIONS
POWER
Note that this control does not require batteries and is not "power
stealing". It does require 24 vac (R and C terminals) of the
low-vnltage transformer to be connected to it for proper operation.
It will not operate without these 2 connections.
OUTDOOR TEMPERATURE SENSING
The dual fuel thermostat uses outdoor temperature to determine
whether the furnace or the heat pump is allowed to operate. The
outdoor tempermure sensor, Part No. TSTATXXSEN01-B, is
supplied with the unit and must be installed. Plan installation so
that 2 wires can be run from the thermostat to an outdoor location,
preferably on the north side of the house or refer to Installation
Instructions included with the outdoor temperature sensor for
simplified connection. Sensor can be mounted to outdoor unit and
existing control wires may be used for its connection. Details are
provided in the sensor Installation Instructions.
INSTALLATION
Step 1--Thermostat Location
Thermostat should be mounted;
•Appmximately 5 ft (l.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 is a 4 section DIP switch within the thermostat which must
be properly set by the installer. It is easiest to set these 4switches
before the thermostat is mounted on the wall, so STOP and
complete the following steps:
1. Open hinged thermostat cover.
2. Remove cover completely by snapping it apart at hinge.
3. Open thermostat by pressing back half of the right end of
plastic case inward while, at the same time, pulling front and
back halves apart at the fight end. The 2 halves will swing
apart.
4. Snap hinge apart to completely separate the 2 halves.
5. Switches are located in upper right corner of circuit board, to
change switch position, use comer of a small screwdriver to
slide switch to opposite position.
6. After switches have been set, do not reassemble the 2 halves.
The rear plastic will be first mounted to wall.
Switch A - Not Used in Dual Fuel Thermostats
This switch must be in OFF position in all dual fuel applications.
DO NOT turn ON.
3
Switch B - Select Smart or Normal Setback Recovery
Selects between normal and smart recovery from setback. Normal
recovery changes to the. new set point at the programmed time.
Smart recovery, which is active in heating mode only, starts earlier
and adjusts the set point 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 - Select Enable/Disable of 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
disconnected, cooling is allowed regardless of switch setting.
TO SET:
OFF---cooling is disabled at outdoor temperatures below 55°F.
ON---cooling is enabled 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 contmlling
asingle- 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
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.
NOTE: Mercury is a hazardous waste and MUST be disposed of
properly.
3. Open thermostat rear door (mounting base) to expose mount-
ing holes. The base can be removed to simplify mounting.
Snap apart carefully at hinge 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 leveled for proper operation)
and mark wall through 2 mounting holes.
5. Drill two 3/16-in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 screws and anchors
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 con-
nected.
8. Match and connect equipment wires to proper terminals of the
connector blocks. (See Fig. 2 through 9.) Both R and C must
be connected for proper thermostat operation.
installation or taming on unit.
9. Push any excess wire into walt and against mounting base.
Seal hole in wall to prevent air leaks. Leaks can affect
operation.
Ill. Snap hinge back together.
11. Close thermostat assembly making sure pins on back of circuit
board align with sockets in connector.
---> 12. If this is a replacement installation, be sure to remove the
interface control which may have been used to interface a
standard thermostat to a dual fuel installation. All the wires
(with the exception of the outdoor sensor S I and $2 wires)
from the thermostat go directly to the furnace. The interface
control must be removed and not used.
13. Turn ON power to unit.
On power up, display shows dF or d2 for a few seconds to indicate
that it is a dual fuel thermostat. (See page 11.)
--> Step 4--Set Thermostat Configuration
Configuration options, like DIP switch settings, are intended to be
selected at installation and normally are not modified by the
homeowner. These options are not discussed in the Homeowner's
Manual and therefore must be selected as part of the installation.
A special procedure allows entry into the configuration mode.
While in the configuration mode, 7 selections can be made. A
description of each of these and how to use the configuration mode
follows.
CONFIGURATION OPTIONS--SUMMARY:
Option 01--Anticipator adjustment
Option 02---Clean filter timer adjustments
Option 03--Fahrenheit or Celsius operation
Option _7--Not applicable
Option 08--Auxiliary heat lookout setting
Option 09--10_Not applicable
Option 1l_Balance point setting
Option 12--Not applicable
Option 13_Room temperature offset adjustment
Option 14--Not applicable
Option 15_Enable AUTO mode
TO ENTER THE CONFIGURATION MODE:
Press and hold FAN button for approximately I0 sec until COOL
set point display indicates a flashing 01. The thermostat is now in
the configuration mode. It will automatically exit this mode if no
button is pressed for 3 minutes. Pressing END button will exit the
configuration mode immediately.
WHILE IN THE CONFIGURATION MODE:
The upper small (COOL set point) display indicates the selected
option number and the large display indicates the selection made
within that option. One of these will be flashing. The up and down
buttons are used both to move between the available options and to
make selection for each option. When the option number (small
display) is flashing, the up and down buttons adjust it, moving
between the available option numbers. After the desired option
number has been selected, press SET TIMEcTEMP button once.
The large disply will now flash, indicating that the up and down
buttons now control the available choices within that option. Each
4
press of SET TIME/q'EMP button switches between the available
option (small display) and the available selections within each
option (l_ge display).
CONFIGURATION OPTIONS--SELECTION:
Option 1--Anticipator Adjustment
This adjustment controls the sensitivity and cycle rate of the
thermostat. Higher numbers decrease the sensitivity and slow the
cycle rate. Lower numbers increase the sensitivity and cycle rate.
However, a limiting feature will not allow more than 4 cycles per
hour, regardless of setting. Anticipator values can range from 1 to
9. Factory default is 3. This default setting will provide optimum
performance in nearly all installations. Try it first. Do not change
setting unless there is evidence of need to do so.
Unlike conventional anticipators, this setting is not to be deter-
mined by current draw. There is not need to measure, know. or
compensate for current. There is also no droop with this thermo-
slat. Regardless of setting and the number of stages, beth heating
and cooling will control to their respective set points.
TO ADJUST:
I. Enter configuration mode (if not already there). See above.
The upper small (COOL set point) display will be flashing 01.
If not, use up and down buttons to move it to 01.
2. Press SET TIME/TEMP button once to flash the current
selection of 1through 9 on the large display. Factory default
is 3.
3. Use up and down buttons to move between the available
choices.
4. Press SET TIME/TEMP button again to flash the upper small
disply for selection of another option, or press END to exit the
configaradon mode.
Option 2_lean Filter Timer
Select hours of blower operation (heating, cooling, or fan) before
CLEAN FILTER icon is displayed. With OFF selected, icon will
never come on, disabling this feature. Time selection can be from
400 to 3600 hrs by selecting numbers 1through 9. (Time is 400X
number selected.) Factory default is 2 (800 hrs). Recommended
selections are: disposable filter_ to 800 hrs, media
filter--1200 to 1600 hrs, or electronic air cleaner--1600 to 2400
hrs of blower operation.
TO SELECT OR ADJUST:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate 02.
2. Press SET TIME/TEMP button once to flash current selection
of OF, or 1 through 9 on large display. Factory default is 2.
3. Use up and down buttons to move between the available
choices.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 3---Fahrenheit or Celsius Operation
Select between Fahrenheit and Celsius operation. Factory default
is Fahrenheit.
TO SELECT:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate 03.
2. Press SET TIME/TEMP button once to flash current selection
of For C. Factory default is F.
3. Use up and down buttons to move between C and F on large
display.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
the configuration mode.
Option 8---Auxiliary Heat Lockout Setting
This option allows selection of an outdoor temperature of 5 °
through 55°F in 5° steps (or equivalent values in C), or OF (off).
Furnace is prevented from operating for outdoor temperatures
above the selected temperature. If OF (off) is selected, furnace
operation is allowed at all outdoor temperatures. If selected.
emergency heat (EHEAT) overrides this feature. Factory default is
OF. This setting can only be equal to or above the setting choice
made for Option 11. Moving this setting lower may "push" Option
11 setting downward.
TO SELECT:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate 08.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up and down buttons to move between 5, 10, 15, 20, 25,
30, 35, 40, 45, 50, 55, or OF on large display. Factory default
is OF. Remember, this may change setting for Option 11.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
the configuration mode.
Option 1 l--Balance Point Setting
This option allows selection of an outdoor temperature of 5 °
through 55°F in 5° steps (or equivalent values in C), or OF (off).
Heat pump is prevented from operating for outdoor temperatures
below selected temperature. If OF (off) is selected, heat pump
operation is allowed at all outdoor temperatures. Factory default is
OF. This setting can only be equal to or below the setting choice
made for Option 8. Moving this setting higher may "push" Option
8setting upward.
TO SELECT:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate l 1.
2. Press SET TIME[FEMP button once to flash large display.
3. Use up and down buttons to move between 5, 10, 15, 20, 25,
30, 35, 40, 45, 50, 55, or OF on large display. Factory default
is OF. Remember, this may change setting for Option 8.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 13--Room Temperature Offset Adjustment
This option allows calibration (or deliberate miscalibration) of the
room temperature sensor. There are various reasons why home-
owners may want to have the displayed temperature adjusted to a
higher or lower value. The selected number is the number of
degrees, plus or minus, which will be added to the actual
temperature. The numbers can range between -5 and +5. Factory
default is 0. This adjusted value will be used as the actual
temperature for both the display and the control action. For
example, if 2 is selected. 72" actual will read 74 °. If set point is 72 °
then the room will control to an actual temperature of 70 ° which
will be displayed and acted upon as if it were 72 °. The effect is that
a positive number selection will make the room temperature lower
and vice versa. The thermostat is calibrated within an accuracy of
plus or minus 1° when shipped from the factory, so this adjustment
will provide the best accuracy when set to O.
--_ Table 2--AcUve Outputs for Each Operating State
1-SPEED HEAT PUMP 2-SPEED HEAT PUMP
Pan GFan G
Coo! Y/Y2, O/W2, G Lo Cool Y1/W2, O/W2, G
Hi Cool Y1/W2, Y/Y2, O/W2, G
HP Heat Y/Y2, G Lo HP Heat YIAN2, G
Hi HP Heat Y1/W2, Y/Y2, G
Furnace Lo W/W1
Furnace Hi W/W1, Y1/W2 Furnace W/W1
TO SELECT:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate 13.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up and down buttons to move between -5 and +5 in 1°
steps on large display. Factory default is 0.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 15_Enable Auto Mode
This option allows the installer to enable or disable AUTO mode
(automatic changeover between heat and cool). When disabled,
AUTO icon does not appear when successive presses of MODE
button are used to move between OFF, HEAT, COOL, and
EHEAT (in heat pump systems). Factory default is ON (AUTO
enabled).
TO SELECT:
1. Enter configuration mode if not already there. See above. Use
up and down buttons to make small (now flashing) display
indicate 15.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down button to move between ON and OF on large
display. Factory default is ON (AUTO enabled).
4. Press SET TIME/q'EMP button again to flash upper small
display for selection of another option or press END to exit
configuration mode.
--') Step 5_Check Thermostat Operation
Before doing the checkout, press HOLD button to turn on HOLD
icon, locking the thermostat in hold mode. This will assure set
points do not change during the checkout. Outputs for each stage
of operation are listed in Table 2.
TO TEST FAN:
1. Press FAN button. Fan ON icon and the G output will go on
within a few seconds, causing fan to operate.
2. Pressing FAN button again will turn off the G output and turn
on Fan AUTO icon.
TO TEST COOLING:
Press MODE buuon until COOL icon under it turns on. Press
down button until cool set point (upper right 2 digit display with
COOL now flashing under it) is 2° or 3°below room temperature.
This will create a cooling demand. A small triangle to the left of
this COOL icon will flash or come on continually. Flashing means
the equipment is going to turn on but is presently being held off by
a system timer. (See "Operational Information" on page 11 for
timer descriptions.) Defeat timer by pressing UP and FAN buttons
together. This will make the triangle stay on and turn cooling
equipment on. To turn off, raise cooling set point above room
temperature. The cooling and the triangle will turn off within a few
seconds.
If system has a 2-speed compressor, it will start on low and
proceed to high 15 minutes later due to a staging timer which
requires 15 minutes of low before high comes on. The UP and
FAN buttons cannot be used to defeat this timer. This timer can be
defeated by reducing the set point to more than 5°below room
temperature, bringing on a high speed demand within 5 seconds.
Remember--2-speed units have a 1 minute off time between lo
and high speed, so the thermostat's demand will not show
immediately as a speed change in the outdoor unit. It will show
immediately as an increase in the indoor fan speed.
TO TEST HEAT PUMP HEATING:
Press MODE button until HEAT icon under it turns on. Press up
button until HEAT set point (LOWER right 2-digit display with
HEAT now flashing under it) is 2°or 3°(not more) above room
temperature. This will create a first stage heating demand. A small
triangle to the left of this HEAT icon will flash or come on
continually. Flashing means the equipment is going to turn on but
is presently being held off by a system timer. (See "Operational
Information" on page 11 for timer descriptions.) Defeat timer by
pressing LIP and FAN buttons together. This will make the triangle
stay on and turn on the heat pump. To turn off, reduce the heating
set point below the room temperature. The heating and the triangle
will turn off within a few seconds.
If the system has a 2-speed compressor, it will start on low and
proceed to high 15 minutes later due to a staging timer which
requires 15 minutes of low before high comes on. The UP and
FAN buttons cannot be used to defeat this timer. If set point is
raised to more than 5°above room temperature, the staging timer
is defeated and the thermostat will call for high speed heat pump
heating within 5 sec. This is not recommended because once the
demand exceeds 5°, the thermostat may jump to furnace heating at
any time. Use the method below to test the furnace.
TO TEST FURNACE HEATING:
To test, press MODE button until EHEAT icon turns on. This will
allow operation of the furnace only. Raising set point above room
temperature will turn on the furnace. Reducing set point below
room temperature will turn it off.
If the heat pump is single speed and the furnace is 2-stage, the
thermostat can be used to control the second stage. (See Fig. 4, 6,
and 8.) To test second stage, raise set point to more than 5° above
room temperature (defeating 15-minute staging timer). Within 5
sec, the thermostat will bring on the furnace second stage.
6
---) Step 6.--Final Settings
1. Assuming the system is to be left in operation after the
installation is.complete, use MODE button to select between
HEAT, COOL, EHEAT, or AUTO to provide the desired
operation of heating, cooling, or both.
2. The default set points and programmed schedule conform to
the Energy Star requirements of the U.S. Department of
Energy for both heating and cooling. These provide energy
saving temperature settings.
3. Turn on HOLD if fixed set points are to be used. If the
programmed schedule is to be used, make sure the HOLD icon
is oft:
4. For further information on temperature selection and program-
ming, refer to Homeowner's Guide.
5. If AUTO mode is to be used, be sure both heat and cool set
points are properly adjusted.
6. The FAN button may be used to select between AUTO (fan on
only with equipment) and ON (fan on continuously) fan
modes.
---) Step 7---Checklist
1. Put away tools and instruments, and clean up debris.
2. Review Homeowner's Guide with owner.
3. Leave literature packet with owner.
4. Fill out and return survey card.
Table 3--Wiring Diagram Reference Chart
EQUIPMENT SINGLE-SPEED "I3NO-SPEED
SELECTION HEAT PUMP HEAT PUMP
1-Stage Furnace Fig. 2 Fig. 3
2-Stage Furnace Fig. 4 Fig. 5
Variable-Speed
2-Stage
Non-Condensing Fig. 6 Fig. 7
Furnace
Variable-Speed
2-Stage
Condensing Fig. 8 Fig. 9
Furnace
Table 4--Dual Fuel Thermostat Quick Reference
THERMOSTAT OUTPUTS
Outdoor Set DIP 24v Hot iCommon Fan Heat Heat Heat Cool Cool Reversing
Unit Switch D ; Stage 1 Stage 2 Stage 3 Stage 1 Stage 2 Valve
1-Speed OFF RC G Y/Y2 (compressor) W/W1 (furnace io) Y1/W2 (furnace hi) Y/Y2 N/A O/W2
HP
2-Speed
HP ON R C G Y1/W2 (compressor Io) Y/Y2 (compressor hi) W/W1 (furnace) YlP4V2 Y/Y2 O/W2
DUALFUEL
THERMOSTAT
24 VAO HOT
FAN [_
HEAT STAGE 2
(FURNACE)
HEAT( L
STf_,
(0OM..ESSOR,
RVS COOLING r_
N/A
24 MAC COM
N/A
RVS SENSING
OUTDOOR
ON
A B C D
OFF OFF OFF OFF
SINGLE-STAGE SINGLE-SPEED
FURNACE HEAT PUMP
---[311,-- ___r_,
---El .___-_LI_
--- IS].... -q-El
......... 13q--El
See notes 1,2, 3, 4, and 9
OUTDOOR
----4 ........ _*1
SUGGESTED DIP
SWITCH SETrlNGS
-) Fig. 2_ingle-Stage Furnace
with Single-Speed Heat Pump
DUALFUEL
THERMOSTAT
24 VAC HOT
FAN
HEAT STAGE 2
(FURNACELO)
HEAT/ OOL
ST_E_I--_TI-
(COMPRESSOR)
RVS COOLING _"
4EAT STAGE 3 _'_.
(FURNACEHI)
24 VAD COM
RVS SENSING [_
OUTDOOR 1_
OFF OFF OFF OFF
TWO-STAGE SINGLE-SPEED
FURNACE HEAT PUMP
__A__.__.__L[_
---t-[Z]
---tf_ -_
....
See notes 1,2, 3, 4, 7, and 9
SUGGESTED DIP
SWITCH SE13JNGS
-_ Fig. 4--Two-Stage Furnace
with _Jingle-Speed Heat Pump
A98443
A98562
DUALFUEL
THERMOSTAT
SINGLE-STAGE TW_SPEED
FURNACE HEATPUMP
HEATSTAGE3
(FURNACE)[_.V_I'] -
HEAT/COOL
STAGE 2
(COMPRESSORHI) r_-_]-
RVS COOLING
NEAT/COOL
STAGE 1
;OMpP.ESSORLO) [_
24 MAC COM
NJA
RVS SENSING
OUTDOOR
SENSOR _ r--'z:"-I
CONNECTION
OFF OFF OFF (3_
___
--- 'l-Gl
-E]---_
[]
See notes t, 2, 3, 4, 5, 6, a_d 10
OUTDOOR
............ J
SUGGESTED DIP
SWITCH SE'n-INGS
Fig. 3_--Single-Stage Furnace
with 2-Speed Heat Pump
DUAL FUEL TWO-STAGE TWO-SPEED
THERMOSTAT FURNACS HEAT PUMP
i
24 VAC HOT
FAN
HEAT STAGE 3 ['_"_ _
(FURNACE)
HEAT/ L
COMPRESSORHI)
RVS COOLING
HEAT/C L
STA_,
24 VAC COM
N/A
RVS SENSING
OUTDOOR [_
coS Nc ,"ON]_
OFFOFFOFF ON
___
--- --1_]
.... _ .___-_,-_
.__rT_--1.___.P--I_
See note_, 1, _, 3, 4, S, 6, 8, _r_d 10
SUGGESTED DIP
SWITCH SETTINGS
Fig. 5_Two-Stage Furnace
with 2-Speed Heat Pump
A98444
A98563
VARIABLE-SPEED 80% NON-CONDENSING FURNACE
I)UAL FUEL
THERMOSTAT
RVS COOLING
HEAT STAGE 3
(FURNACE H_)
HEAT STAGE 2
(FURNACE LO) r_.
HEAT/COOL
STAGE 1
(COMPRESSOR)
FAN
24 VAC HOT
24 VAC COM
NIA [_
RVS SENSING
OUTDOOR1--13_
AFS
B___ S,NGLESPEED
HEAT PUMP
FURNACE "_
BOARD
.... w_Z.... I
.... z .... -_L_i
--- _ .... -_-_1
--- _ .... -_-_1
See notes 1,2, 3, 4, 7, and 9
OUTDOOR
............. J
VARIABLE-SPEED 80% NON_ONDSNSING FURNACE
DUAL FUEL
THERMOSTAT
RVS COOLING
HEAT/COOL
STAGE t
(COMPRESSOR LO)
HEAT STAGE 3
(FURNACE)[_-
HEAT/COOL
STAGE 2
_OMPRESSOR HI)
FAN
24 VAC HOT
24 VAC COM
N/A
RVS SENSING [_
OUTDOOR [_'
AFS
II--_B--OAR'-DI TWO-SPEED
_ _F/._ _E _IHEAT PUMP
BOARD__ ',I.
[] L-_-,q-E
__._-_______:<_
.---[_3 E
.--_---_-_-E
.___ ___4___E
See notes 1, 2, 3, 4, 5, 6, 8, and 10
OUTDOOR
............. J
i
SWITCH SETTINGS
OFF OFF OFF OFF
A98447
--_ Fig. 6---Variable-Speed 2-Stage Non-Condensing
Furnace
with Single-Sp_l Heat Pump
VARIABLE-SPEED
DUAL FUEL CONDENSING SINGLE-SPEED
THERMOSTAT FURNACE HEAT PUMP
24 VAC HOT
FAN
HEAT STAGE 2
(FURNACELO) r_---1-
HEAT/COOL
STAGE 1 _-
(COMPRESSOR)
RVS COOLING r__.
HEAT STAGE 3
(FURNACEHI)
24 VAC COM
N/A
RVS SENSING
ou_oRI--I-7t
ON
A B C D
OFF OFF OFF OFF
m
..... _ .....
..... _ ....
.... -I_....
See notes 1,2, 3, 4, 7, and 9
OUTDOOR
SUGGESTED DIP
SWITCH SETTINGS
A98445
Fig. 8---Variable-Speed Furnace
with Single-Speed Heat Pump 9
ON
A B C O
SUGGESTED DIP
SWITCH SETTINGS
OFF OFF OFF ON A98448
Fig. 7--Variable-Sp_d 2-Stage Non-Condensing
Furnace
with 2-Sp_d Heat Pump
VARIABLE-SPEED
DUAL FUEL CONDENSING TWO-SPEED
THERMOSTAT FURNACE HEAT PUMP
i,...=...-1
24 VAC HOT
FAN
HEAT STAGE 3_.
tFURNAC_)
HE TIC L
_TA_ F_--I-
COMPRE,P_R HI )
RVS COOLING
HEAT/COOL
STAGE 1
;OMPRIESSORLO) _'_
24 VAC COM
N/A [_
RVS SENSING [_
ON
ABCD
OFF OFF OFF ON
w
.... I[]
.... _ .....
.... _ .....
[] []
.... _. .....
See notes 1,2, 3, 4, 5, 6, 8, and t0
OUTDOOR -_
.-_]-_-,
............. .I
SUGGESTED DIP
SWITCH SETTINGS
-_ Fig. 9---Variable-Speed Furnace
with 2-Speed Heat Pump
A98446
--) WIRING DIAGRAM NOTES:
1. Heat pump MUST have a high pressure switch for dual fuel applications.
2. Outdoor All"Temperature Sensor must be attached in all dual fuel installations.
3. The RVS Sensing terminal "L" should not be connected. This is internally used to sense defrost operation.
4. Refer to indoor and outdoor equipment Installation Instructions for additional information and setup procedure.
5. Select the "ZONE" position on the 2-speed heat pump control board.
6. Do not select the "FURNACE INTERFACE" or "BALANCE POINT" option on the 2-speed heat pump control board. This is controlled
internally by the Dual Fuel Thermostat.
7. As an option, lock the furnace into low-fire operation and let YI/W2 control high-fire operation. Refer to indoor equipment Installation
Instructions for proper setup.
8. Furnace must control its own second-stage heat operation via furnace control algorithm. Refer to indoor equipment Installation Instructions
for proper setup.
9. Dip Switch D must be in the OFF position for single-speed compressor operation. This is the factory default.
10. Dip Switch D must be in the ON position for 2-speed compressor operation.
10
-* OPERATIONAL INFORMATION
Five-minute Compressor Timeguard
This timer prevents the compressor from starting unless it has been off for at least 5 minutes. It can be defeated for 1cycle by simultaneously
pressing the FAN button and the UP button.
Fifteen-minute Cycle Timer
This timer prevents the start of a heating or cooling cycle until at least 15 minutes after the last start of the same cycle. Its function is to assure
that equipment is not cycled more than 4 times per hour. This timer is defeated for 1 cycle when the desired temperature is manually changed.
It can also be defeated for 1 cycle by simultaneously pressing the FAN button and the UP button.
Fifteen-minute Staging Timer
In multistage heating or cooling, this timer prevents any higher stage from turning on until the preceding stage has been on for 15 minutes.
This timer is defeated if the temperature error is greater than 5°F (usually due to a large change in desired temperatureL
Three-minute Minimum On Time
In normal operation, when a stage turns on, it will not tam off for a minimum of 3 minutes.
Heat/Cool Set Points (Desired Temperatures)
A minimum difference of 2 degrees is enforced between heating and cooling set points. This is done by allowing one setting to "push" the other,
to maintain this difference.
Auto Changeover
When the auto changeover mode is selected, a change from heat to cool (or vice versa) will not occur until an opposite mode demand has existed
continually for 20 minutes. If the set point is changed, the 20 minute requirement is deleted.
Emergency Heat Mode
When emergency heat mode is selected, all Y signals are locked out and W becomes energized upon a call for heat.
Power On Check
When AC power is first applied, all icons of the display are turned on for a few seconds, and the temperature display reads "dF" if it is set for
single speed compressor (DIP switch D set to OFF), or "d2" if it is set for 2-speed compressor (DIP switch D set to ON).
Error Codes
-- - If thermostat cannot properly read room temperature, the room temperature display will indicate "--"and thermostat will enter FREEZE
PROTECT mode. When outdoor temperature is below 50"F furnace will operate for sufficient time every half hour to keep home from
freezing. The ON time is given by the formula: Minutes ON equals 15 minus (outdoor temperature in "F divided by 4).
E2 - If the AC line voltage drops below a minimum (brownout) level, all outputs are turned off and the display indicates E2. If the AC line
voltage disappears completely, the display will immediately go blank.
E3 - If thermostat cannot properly read outdoor temperature, E3 will alternate with room temperature on the room temperature display and the
outdoor temperature will read "--" (2 dashes).
E6 - If defrost timer continues for longer than 15 minutes, E6 will be displayed. Check heat pump wiring or for a failed heat pump defrost
control.
Auxiliary Heat Icon
This icon is displayed when the furnace is operating.
Smart Recovery
With Smart Recovery selected, the transition out of a heating setback begins 90 minutes before the selected recovery time and gradually adjusts
room temperature so that the desired temperature will be achieved at the selected recovery time.
--_ Thermostat Troubleshooting
SYMPTOM WHATTOCHECK
Check for 24 VAC between R and C at terminal connections. Both Rand Cmust be con-
Blank LCD nected for proper operation.
Temperature sensor reading out of range. Check sensor for damage. If recycling power
"-" on temperature display does not clear display, thermostat should be replaced.
Brownout condition or too low ot voltage to thermostat. Double check wiring and check for
"E2" on temperature display 24 VAC between R and C. E2 will clear 15 seconds after proper voltage is restored.
"E3" on temperature display Outdoor temperature sensor reading out of range. An attempt to read outdoor temperature
results in "--" on display. Check for shorted, open, or failed outdoor temperature sensor.
"E6" on temperature display System stuck in defrost. Check wiring and heat pump defrost control beard
After the selected number of hours of blower operation "clean filter" will display on LCD.
"Clean Filter" on temperature display This is to remind the homeowner to "check" tilter. Press "reset filter" button to clear dis-
play and reset timer to O.
Select COOL mode. Decrease COOlingset point to 10 degrees below room temperature.
Simultaneously press FAN and UP buttons to defeat timers. Check for 24 VAC at Y/Y2
Cooling will not come on terminal. If present, thermostat is OK and problem is with equipment or wiring. If not
present, replace thermostat.
Select HEAT mode. Increase heating set point to 2 or 3 degrees (not more) above room
temperature. Simultaneously press FAN and UP buttons to defeat timers for 1cycle.
Heating will riot come on Check for 24 VAC at Y/Y2 terminal (single-speed HP) or Y1/W2 terminal (2-sp_ed HP)
after 10 seconds. Increase heating set point to 7 or 8 degrees above room temperature.
Check for 24VAC at W/Wt terminal.
11
DUAL FUEL THERMOSTAT CONFIGURATION RECORD
Date
Owner/Operator Thermostat Model No.
A) Hardware Configuration
Switch A__Not Used. Do Not Turn On. (OFF = Dual Fuel Application)
Switch B__Smart Recovery. (OFF = Enable, ON = Disable)
Switch C__Low Ambient Cooling Lockout. (OFF = Disable, ON = Enable)
Switch D__Heat Pump Staging. (OFF= 1-Speed, ON =2-Speed)
B) Mode Settings
Hold (On or Off)
__ Mode (Off, Heat, Cool, Auto, Eheat)
__ Heating Set Point Value
__Cooling Set Point Value
Fan (Auto or On)
C) Configuration Options
1 _ Anticipator (1-9: factory default = 3)
2 _. Clean Filter Timer (Off or 1-9: factory default = 2)
3 _. Fahrenheit or Celsius (F or C: factory default =F)
4-7 _. N/A
8 __ Auxiliary Heat Lockout (Off or 5-55°F: factory default = Off)
9-10__ N/A
11 __ Balance Point Temperature (Off or 5-55°F: factory default = 40)
12 ___ N/A
13 _ Room Temperature Offset (-5 to +5: factory default = 0)
14 _.N/A
15 _.Enable Auto Mode (Off or On: factory default = On)
D) Schedule
Mon
Tue
Wed
Thu
Fri
WAKE DAY EVE SLEEP
TIM TTI T IM L] JME;__E_LT._._L
Sat __ __
Sun
A98449
Copyright 1998 CARRIER Corp. * 7310 W. Morris St. •Indianapolis, IN 46231 tstat18i
Manufe_turer reserves the right to discontinue, or change at any time, speclfk?,41tlons or designs without notioe and without Incurring obligations,
Book I 1 I 4 PC 101 Catalog NO. 03TS-TA9 Printed in U.S.A. Form TSTAT-18SI Pg 12 10-98 Replsces: TSTAT-9SI
Tab I misc, Imisc-
