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 Thermidistat Control.
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, and CAUTION. 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 would result in minor personal
injury or product and property damage.
INTRODUCTION
Carrier’s 7-day programmable/non-programmable Thermidistat
Control is a wall-mounted, low-voltage control which combines
temperature and humidity control in a single attractive unit. An
extension of Carrier’s proven line of thermostats, it provides
separate set points for heating and cooling, and now adds humidification and dehumidification. Different heating and cooling set
points and times are programmable for 4 periods per day and 7
days per week. The Thermidistat Control can also be fieldconfigured as a non-programmable thermostat. When operating in
the non-programmable configuration it will still have both temperature and humidity control. Humidify and dehumidify outputs
provide direct control of humidity. Batteries are not used. During
power loss an internal memory stores programs and settings for
unlimited time, and the clock continues to run for at least 8 hr.
Page
HEIGHT (IN.)WIDTH (IN.)DEPTH (IN.)
4-3/87-3/81-3/8
Fig. 1—Thermidistat Control
INSTALLATION CONSIDERATIONS
POWER
Note that this control does not require batteries and is not "power
stealing." It does require 24vac (R and C terminals) of the
low-voltage transformer to be connected to it for proper operation.
It will not operate without these 2 connections.
MODELS
There is a single programmable/non-programmable model for all
applications. It can be configured for AC or HP, 1- or 2-speed
compressor, and for dual fuel installations, allowing it to be used
in place of all Carrier thermostats.
HUMIDIFY EQUIPMENT AND CONNECTIONS
.
The humidify output connects directly to 24vac operated humidifiers. No other connection or interlock is required. Any of several
installer-selectable operating modes are available.
DO NOT connect Furnace HUM terminal directly to
→
Thermidistat HUM terminal. This will bypass furnace safety
controls. See Low Voltage Wiring Daigrams and notes for
proper connection.
DEHUMIDIFY EQUIPMENT AND CONNECTIONS
The dehumidify output connects to the dehumidify input on
variable-speed furnaces and fan coils. Additional dehumidification
is done by controlling the compressor. A variety of operating
modes are available.
OUTDOOR TEMPERATURE SENSOR
Optimum performance is obtained when an outdoor temperature
sensor is used with the Thermidistat Control. Plan installation so
that 2 wires can be run from Thermidistat Control 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 sensor instructions.
A98426
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 14
Tab misc. misc.
PC 101Catalog No. 03TS-TA17Printed in U.S.A.Form TSTAT-23SIPg 18-99Replaces: TSTAT-19SI
INSTALLATION
Step 1—Thermidistat Control Location
Thermidistat Control 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.
Thermidistat Control 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 or heat from a lamp, sun, fireplace, or
other temperature-radiating objects which could cause a false
reading.
• Close to or in direct airflow from supply registers and return-air
registers.
• 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 Thermidistat Control
which must be properly set by the installer. It is easiest to set these
4 switches before the Thermidistat Control is mounted to the wall,
so STOP and complete the following steps:
1. Open hinged Thermidistat Control cover.
2. Remove cover completely by snapping it apart at hinge.
3. Open Thermidistat Control 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 right 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 corner 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 first be mounted to the wall.
SWITCH 1—AC/HP SELECT
Use this switch to select between air conditioner and heat pump
systems.
TO SET:
OFF—for air conditioner installations. This is factory default.
ON—for heat pump installations, using either a fan coil or furnace
(dual fuel).
SWITCH 2—1 SPEED/2 SPEED
This switch tells the system whether the compressor is 1 or 2
speed.
TO SET:
OFF—for single-speed compressor. This is factory default.
ON—for 2-speed compressors, whether AC or HP.
SWITCH 3—SMART/CONVENTIONAL RECOVERY
Selects between conventional and smart recovery from setback.
Conventional recovery changes to new set point at programmed
time. Smart recovery, which is active in both heating and cooling,
starts 90 minutes earlier and smoothly adjusts set point so room
will arrive at programmed temperature at programmed time.
TO SET:
OFF—for smart recovery. This is factory default.
ON—for conventional recovery.
SWITCH 4—INSTALLER TEST OFF/ON
Selects a special installer test mode which assists with system
startup and checkout. See Step 5, System Startup and Check-out.
TO SET:
OFF—for normal operation. This is factory default.
ON—for installer test mode.
Step 3—Install Thermidistat Control
Before installing Thermidistat Control, turn off all power to
equipment. There may be more than 1 power disconnect.
Electrical shock can cause personal injury or death.
1. Turn off all power to equipment.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, 1 at a time.
c. As each wire is disconnected, record wire color and
terminal marking.
d. New or additional wire may be needed to accommodate
added humidity outputs.
e. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and MUST be disposed of
properly.
3. Select Thermidistat Control rear plastic. (If it is not separated
from the remainder of the Thermidistat Control, refer to Step
2 above.)
4. Route wires through large hole in rear plastic. Level rear
plastic against wall (for aesthetic value only—Thermidistat
Control 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 rear plastic to wall with 2 screws and anchors
provided. Additional mounting holes are available for more
secure mounting if needed. Make sure all wires extend
through hole in mounting base.
7. Adjust length and routing of each wire to reach proper
connector block and terminal on rear plastic with 1/4-in. extra
length. Strip only 1/4 in. of insulation from each wire to
prevent adjacent wires from shorting together when connected.
8. Match and connect equipment wires to proper terminals of
each connector block. (See Low Voltage Wiring Diagram
Reference Chart and Figs. 1 through 28 in separate Wiring
Diagram literature). Remember R and C must be connected
for proper operation.
Improper wiring or installation may damage Thermidistat
Control. Check to make sure wiring is correct before proceeding with installation or turning on power.
9. Push any excess wire into wall and against rear plastic. Seal
hole in wall to prevent air leaks. Leaks can affect operation.
10. Reattach Thermidistat Control body to rear plastic by first
reattaching hinge.
11. Close Thermidistat Control assembly, making sure pins on
back of circuit board align with sockets in connector.
12. Turn on power to equipment.
On power up, all display segments will light for 5 sec. For the next
5 sec, a 2-digit code appears on large display which identifies
Thermidistat Control configuration:
1. AC—for 1-speed air conditioner
2. HP—for 1-speed heat pump
2
3. A2—for 2-speed air conditioner
4. H2—for 2-speed heat pump
5. dF—for 1-speed dual fuel
6. d2—for 2-speed dual fuel
7. HS—for 1-speed heat pump with Intelligent Heat Staging
(3-stage auxiliary heat with 40FK, FK4C, or FV4A Series fan
coils.)
When this identifier disappears, normal operation begins. The
MODE control should be set to OFF and FAN control to AUTO,
so equipment does not start until further configuration and checkout is completed.
Step 4—Set Thermidistat Control 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 made as part of the installation. A
special procedure allows entry into the configuration mode. While
in configuration mode, up to 17 selections can be made. A
description of each selection and how to use the configuration
mode follows.
CONFIGURATION OPTIONS — SUMMARY:
Option 1—Anticipator adjustment
Option 2—Clean filter timer adjustment
Option 3—English/Metric selection
Option 4—Fan (G) ON with W selection
Option 5—Variable-speed blower present selection
Option 6—Cooling lockout below 55° selection
Option 7—Variable-speed super dehumidification selection (only
available when variable-speed blower is used)
Option 8—Auxiliary heat lockout temperature setting (only avail-
able when heat pump is used)
Option 9—Intelligent Heat Staging selection (only available when
single-speed heat pump is used)
Option 10—Dual Fuel selection (only available when heat pump is
used)
Option 11—Balance point setting (only available when Dual Fuel
is selected)
Option 12—Defrost heat selection (only available when heat pump
is used)
Option 13—Room temperature offset adjustment
Option 14—Heat/cool dead band adjustment
Option 15—Enable Auto mode
Option 16—Enables Super Comfort Heat Mode
Option 17—Non-Programmable selection
TO ENTER CONFIGURATION MODE:
Press and hold FAN button for approximately 10 sec until COOL
set point display indicates a flashing 1. The Thermidistat Control
is now in configuration mode. It will automatically exit this mode
if no button is pressed for 3 minutes. Pressing END button will exit
configuration mode immediately.
WHILE IN CONFIGURATION MODE:
The upper small (COOL set point) display indicates selected
option number and large display indicates selection made within
that option. One of these will be flashing. The up and down buttons
are used both to move between available options and to make
selection for each option. When option number (small display) is
flashing, up and down buttons adjust it, moving between available
option numbers. After desired option number has been selected,
press SET TIME/TEMP button once. The large display will now
flash, indicating that up and down buttons now control available
choices within that option. Each press of TIME/TEMP button
switches between available option (small display) and available
selections within each option (large display).
CONFIGURATION OPTIONS — SELECTION:
Option 1—Anticipator Adjustment
This adjustment controls sensitivity and cycle rate of Thermidistat
Control. Higher numbers decrease sensitivity and slow cycle rate.
Lower numbers increase sensitivity and cycle rate. However, a
limiting feature will not allow more than 4 cycles per hr, regardless
of setting. Anticipator values can range from 1 to 9. Factory
default is 3. This default selection provides 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 determined by
current draw. There is no need to measure, know, or compensate
for current draw. There is also no droop with this Thermidistat
Control. Regardless of setting and number of stages, both heating
and cooling will control to their respective set points.
TO ADJUST:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." The upper small (COOL set
point) display will be flashing 1. If not, use up and down
buttons to move it to 1.
2. Press SET TIME/TEMP button once to flash current selection
of 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display. Factory default
is 3.
3. Use up and down buttons to move between 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 2—Clean 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 range
from 400 to 3600 hr by selecting numbers 1 through 9. (Time is
400 X number selected.) Factory default is 2 (800 hr). Recommended selections are: disposable filter—400 to 800 hr, media
filter—1200 to 1600 hr, or electronic air cleaner—1600 to 2400 hr
of blower operation.
TO SELECT OR ADJUST:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 2.
2. Press SET TIME/TEMP button once to flash current selection
of OF, 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display. Factory
default is 2.
3. Use up and down buttons to move between 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—English/Metric
Select between Fahrenheit and Celsius operation. Factory default
is Fahrenheit.
TO SELECT OR ADJUST:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 3.
2. Press SET TIME/TEMP button once to flash current selection
of F or C. Factory default is F.
3
3. Use up and down buttons to move between F and C 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
configuration mode.
Option 4—Fan (G) On With W
This selection determines whether fan (G) output is to be ON or
OFF when any W (furnace or strip heat) output is ON. Most
furnaces and fan coils manage their own blowers and do not
require separate G signal. For these applications, select OFF. Some
auxiliary heaters require separate G signal to turn on blower. In
this case, select ON. Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 4.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
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 5—Variable-Speed (ICM) Blower
If furnace or fan coil contains a variable-speed (ICM) blower, set
this option to ON. For normal (PSC) blowers, set to OF. This
selection enables system to use special features available only in
units with an ICM blower. Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 5.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
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 6—Cooling Lockout Below 55°F
This option disables cooling when outdoor temperature is below
55°F. It requires an outdoor temperature sensor. Set to OF to allow
cooling below 55°F. Set to ON to prevent cooling below 55°F.
Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 6.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
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 7—Variable-Speed Superdehumidify
This option requires prior selection of variable-speed (ICM)
blower (Option 5). When selected, this option operates blower at
further reduced airflow from that of normal dehumidification when
there is a dehumidification demand without a cooling demand,
achieving maximum humidity removal with minimum cooling. It
is done by supplying blower with a Y signal and no G signal on a
call for cooling. Not all products with ICM blowers have this
feature. Check Installation Instructions for ICM air handler used.
Select OF for normal operation (Y and G supplied on a cooling
call). Select ON for super dehumidification (Y with no G on a
dehumidify only call). Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 7.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
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 8—Auxiliary Heat Lockout Setting
This option requires prior selection of heat pump (DIP switch 1-ON). It allows selection of an outdoor temperature of 5
55°F. (or equivalent values in C), or OF (off). Auxiliary heat
(furnace in Dual Fuel applications) is prevented from operating for
outdoor temperatures above selected temperature. If OF (off) is
selected, auxiliary heat (furnace if Dual Fuel) operation is allowed
at all outdoor temperatures. If selected, emergency heat (EHEAT)
overrides this feature. Factory default is OF (off). 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 Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 8.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to move between OF, 5, 10, 15, 20,
25, 30, 35, 40, 45, 50, or 55 on large display. Factory default
is OF.
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 9—Intelligent Heat Staging
This option requires prior selection of single-speed heat pump
(DIP switch 1—ON, DIP switch 2—OF). It provides 3 stages of
electric heat from W1 and W2 by sequencing W1 only, then W2
only, then both W1 and W2. See FK or FV Series Fan Coil
Installation Instructions for further information. For 3-stage heat,
select ON. For normal 1- or 2-stage heat, select OF. Factory
default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 9.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
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