CARRIER Controls And HVAC Accessories Manual L0210356
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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Thermidistaff M Control
& Og*DLMG
Visit www.camer.com
Installation,
NOTE: Read the entire instruction
installation.
Start-Up, and Operating Instructions
manual before starting
the
This symbol --> indicates a change since the last issue.
INDEX
Page
SAFETY CONSIDERATIONS .....................................................
1
INTRODUCTION ..........................................................................
1
INSTALLATION CONSIDERATIONS ....................................... 1
INSTALLATION ........................................................................
2-8
Thermidistat Cuntro! Location ................................................. 2
Set DIP Switches ......................................................................
2
Install Tl_rta_distat Contro! .................................................. 2-3
Set Thermidistat Control Configuration ............................... 3-7
System Start-Up and Checkout ............................................. 7-8
Final Settings ............................................................................
8
HUMIDITY CONTROL FEATURES ..................................... 8-11
Humidification ..........................................................................
8
Dehumidification .................................................................
9- I0
Vacation .............................................................................
10-1 I
OPERATIONAL
INFORMATION ............................................. 11
THERMIDISTA T CONTROL TROUBLESHOOTING
............ l 1
THERMIDISTAT
CONTROL CONFIGURATION RECORD. 12
WIRING DIAGRAM .............. See Thermidistat Wiring Diagrams
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 Thermidistat Control.
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Control
CONSIDERATIONS
POWER
Note that this control does
stealing." It does require
low-voltage transformer to
It will not operate without
MODELS
not require batteries and is not "power
24vac (R and C terminals) of the
be connected to it for proper operation.
these 2 connections.
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 Cartier thermostats.
HUMIDIFY EQUIPMENT
AND CONNECTIONS
The humidify output connects directly to 24vac operated humiditiers. No other connection or interlock is required. Any of several
installer-selectable operating modes are available.
-->
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 ran 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.
or change at any Ume, specifications
Catalog NO. 03TS-TAt 7
7-3/8
Fig. l_Thermidistat
Recognize safety information. This is the safety-alert symbol Z_.
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 person_ injury or de,._b. 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 humidifiealioD 9DO de_u!q_idJEwalion, l_fferem he,_jng 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 ran for at least 8 hr.
WIOT,
(I..) I
[
or designs
Form TSTAT-23SI
without notice
Pgl
and without
8-99
Incurring
obligations.
Replaces:
TSTAT-1 tiSI
INSTALLATION
Step 1--Thermidistat
Thermidistat
TO SET:
OFF--for normal operation. This is factory default.
ON--for installer test mode.
Control Location
Control should be mounted:
Step 3--Install
Approximately 5 ft (1.Sm) from floor.
Close to or in a frequently used room. preferably on an inside
partitioning wall.
Thermidistat
Control
On a section of wall without pipes or duct work.
Tbermidistat
Control should NOT be mounted:
Close to a window, on an outside wall, or next to a door leading
to the outside.
•
•
1. Turn off all power to equipment.
2. If an existing thermostat is being replaced:
Exposed to direct light or heat from a lamp, sun, fireplace, or
other temperatare-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.
a. Remove existing thermostat
c. As each
1 at a time.
wire color and
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.)
Control cover.
2. Remove cover completely by snapping it apart at hinge.
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.
3. Open Thermidistat Control by pressing back half of the fight
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.
5. Drill two 3/16-in. mounting holes in wall where madced.
4. Snap hinge apart to completely separate the 2 halves.
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.
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.
I--AC!HP
record
terminal marking.
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 Tbermidistat Control is mounted to the wall,
so STOP and complete the following steps:
SWITCH
wire is disconnected,
d. New or additional wire may be needed to accommodate
added humidity outputs.
Step 2---Set DIP Switches
1. Open hinged Thermidistat
from wall.
b. Disconnect wires from existing thermostat.
7. Adjust length and rooting of each wire to reach proper
connector block and terminal on rear plastic with l/4-in, extra
length. Strip only 1/4 in. of insulation from each wire to
prevent adjacent wires from shorting together when connected.
SELECT
Use this switch to select between air conditioner and heat pump
systems.
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.
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
9. Push any excess wire into wall and against rear plastic. Seal
hole in wall to prevent air leaks. Leaks can affect operation.
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.
!0. Reattach Thermidistat
reattaching hinge.
Control
body to rear plastic by first
l 1. Close Thermidistat Control assembly, making sure pins on
back of circuit board align with sockets in connector.
12. Turn on power to equipment.
TO SET:
OFF--for smart recovery. This is factory default.
ON_oc conventional recovery.
SWITCH 4--INSTALLER
TEST OFF/ON
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:
Selects a special installer test mode which assists with system
startup and checkout. See Step 5, System Startup and Cbeck-out.
2
1. AC--for
l-speed air conditioner
2. HP--for
l-speed heat pump
3. A2--for
2-speed air conditioner
4. H2--for
2-speed heat pump
5. dF--for
l-speed dual fuel
6. d2--for 2-speed dual fuel
7. HS--for I-speed heat pump with Intelligent Heat Staging
(3-stage auxiliary heat with 40FK, FK4C, or FV4A Series fan
coils.)
When _his 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 confguration 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
Option 1--Anticipator
Option 2--Clean
-- SUMMARY:
filter timer adjustment
selection
Option 6---Cooling
lockout below 55" selection
Option 9--Intelligent Heat Staging selection (only available when
single-speed heat pump is used)
Fuel selection (only available when heat pump is
Option 11--Balance
is selected)
point setting (only available when Dual Fuel
Option 12_Defrost
is used)
heat selection (only available when heat pump
Option 13_Room
temperature
offset adjustment
Option 14---Heat/eonl dead band adjustment
Option 15--Enable
Auto mode
Option 16---Enables Super Comfort Heat Mode
Option 17_Non-Programmable
TO ENTER CONFIGURATION
selection
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
configuratioh mode immediately.
WHILE IN CONFIGURATION
TO ADJUST:
3. Use up and down buttons to move between available choices.
selection (only
Option 8--Auxiliary
heat lockout temperature setting (only available when heat pump is used)
Option 10_Dual
used)
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 Thermidislat
Control. Regardless of setting and number of stages, both heating
and cooling will control to their respective set points.
of 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display. Factory default
is 3.
blower present selection
Option 7--Variable-speed
super dehumidification
available when variable-speed blower is used)
Adjustment
This adjustment controls sensitivity and cycle rate of Tbermidistat
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 i 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.
2. Press SET TIME/TEMP button once to flash current selection
Option 4---Fan (G) ON with W selection
Option 5_Variable-speed
Option l--Anticlpator
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 i.
adjustment
Option 3--English/Metric
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:
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 beth 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,
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_00
to 800 hr, media
filter--1200 to 1600 hr, or electronic air cleaner--1600 to 2400 hr
of blower operation.
TO SELECT OR ADJUST:
I. 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 T1ME/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
Enter
small
2. Press
configuration mode if not already there. See Step 4 "To
Configuration Mode." Use up and down buttons to make
(now flashing) display indicate 3.
SET TIME/TEMP button once to flash current selection
of F or C. Factory default is F.
3. Useupanddownbuttons
tomove
between
FandConlarge
display.
4. Press
SETTIME/TEMP
buttonagainto flash upper small
call for cooling. Not all products with ICM blowers have this
feature. Check Installation Instructions for ICM air handier 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).
display for selection of another option, or press END to exit
configuration mode.
TO SELECT:
Option 4---Fan (G) On With W
1. Enter configuration
This selection deternaines 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 ease, select ON. Factory default is OF (off).
small (now
2.
4.
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.
flashing)
display
SET TIMEtTEMP
there. See Step 4 "To
Use up and down buttons
indicate
button
to make
7.
once to flash
large
display.
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
button once to flash large display.
Heat Lockout Setting
This option requires prior selection of heat pump (DIP switch 1-ON). It allows selection of an outdoor temperature of 5 ° through
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 1 l setting down-
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME.rI'EMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 5----Varlable-Speed
Press
Mode,"
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
TO SELECT:
2. Press SET TIME/q_MP
mode if not already
Enter Configuration
(ICM) Blower
[f 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).
ward.
TO SELECT:
TO SELECT:
I. 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.
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 T1ME/TEMP button once to flash large display.
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.
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 6---Cooling
4. Press SET TIMEdlEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Lockout Below 55°F
This optioo 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).
Option 9---Intelligent
Heat Staging
I. 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.
This option requires prior selection of single-speed heat pump
(DIP switch l---ON, DIP switch 2--OF). It provides 3 stages of
electric heat from W1 and W2 by sequencing Wl only, then W2
only, then both WI and W2. See FK or FV Series Fan Coil
Installation Instructions for further information. For 3-stage heat,
select ON. For normal I- or 2-stage heat, select OF. Factory
default is OF (off).
2. Press SET TIME/TEMP
TO SELECT:
TO SELECT:
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.
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.
4. Press SET TIME/"I_MP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 7--Variable-Speed
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.
Superdehumidify
This option requires prior selection of varlable-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
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
4
Option 10.--Dual
Fuel Equipment
to operate. This can be somewhat complicated to determine and it
involves knowing the cost of gas and electricity, as well as the
efficiency of the furnace and heat pump. For the most economical
operation, the heat pump should operate above this temperature
(assuming it has sufficient capacity), and the furnace should
operate below this temperature.
COMFORT
The high pressure switch protects compressor and indoor coil from
overpressare which would occur if a failure or wiring error
resulted in the heat pump and furnace operating at the same time.
High Pressure Switch Kit includes required switch and instructions
for proper operation. For all dual fuel installations, outdoor
temperature sensor must be attached. If not, E3 error message will
appear. See "Error Codes."
This option requires prior selection of heat pump (DIP switch
1--<)N), and must be selected in dual fuel installations. It prevents
simultaneous operation of both furnace and heat pump, and
prevents direct transition from heat pump to furnace operation.
When system is dual fuel (heat pump and furnace), set to ON.
When system contains fan coil, set to 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 10.
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 TIMEFI'EMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option
ll--Balanee
Point Setting
This option is for dual fuel installations
only. It requires prior
selection of heat pump (DIP switch 1 -- ON) and dual fuel
equipment (Option 10 -- ON). It allows selection of an outdoor
temperature of 5°F. through 55°F. (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,
beat pump operation is allowed at all outdoor temperatures.
Factory default is OF (off). This setting can only be equal to or
below the setting choice made for Option 8. Moving the setting
higher may "push' Option 8 setting upward.
If the outdoor temperature is above the "balance point setting", the
heat 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. 15 minutes),
then the gas furnace will come on to satisfy the indoor temperature
demand. If the outdoor temperature is below the "balance point
setting" the heat pump will not be allowed to operate (i.e. locked
out), and the gas furnace will be used to satisfy the indoor
temperature.
There are three separate concepts which are related to selecting the
final "balance point setting". Read each of the following carefully
to determine the best "balance point setting" in a dual fuel
installatiom
BALANCE TEMPERATURE:
When the heat pump is operating below this point, the indoor
supply air feels uncomfortable (i.e. too cool). This is purely
subjective and will depend on the homeowner's idea of comforl.
Below this temperature, the gas furnace should operate in order to
satisfy the desire of indoor comtort.
TO SELECT:
I. 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 1 l.
2. Press SET TIMFJTEMP button once to flash large display.
3. Use up or down buttons to move between OF, 5, i0, 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
12---Defrost Heat Select
This option allows installer to select the amount of heat provided
by Thermidistat Control during a heat pump defrost cycle. This can
be very helpful in maintaining a comfortable leaving air temperature during defrost. The Thermidistat Control senses when defrost
is in progress by monitoring voltage placed on the O line by the
heat pump while defrosting. It responds by turning on selected
combination of WI and W2 during defrost. Note that this is very
different from the operation of an ordinary thermostat, which
cannot sense defrost in progress and only turns on its W outputs in
response to a temperature demand. Combinations of WI and W2
are selected via the following:
Table
SELECTION
1--Wl
I W2
Outputs
DEFINITION
0
Neither W1 or W2 is turned on.
This is factory default,
1
2
Only W1 is turned on.
Both W1 and W2 turned on.
3
Only W2 turned on (available
only if 3-stage heat is selected).
TEMPERATURE:
The selection procedure is given below. If 0 is selected, operation
is like that of an ordinary thermostat, and a wire is required
between W2 of outdoor unit and a selected W on indoor unit.
When selection l, 2, or 3 is made, no wire should be connected
from outdoor W2 because this connection may override selection
made. Obviously the heater must be in 2 sections, and fan coil
jumper must be removed between WI and W2 for there to be a
difference between selections l, 2, and 3. For most heaters, Wl is
lower wattage heater, .and W2 is higher, although some have equal
elements for WI and W2. Consult fan coil/heater combination for
the actual wattage connected to each of Wl and W2.
This is the point where the beat pomp cannot provide sufficient
capacity to keep up with the indoor temperature demand because
of declining outdoor temperature. At or below this point, the
furnaceis needed to maintain proper indoor temperature.
ECONOMIC BALANCE TEMPERATURE:
In dual fuel applications, above selection choices apply and can be
used to select low or high heat if furnace is 2 stage. WI will
produce low heat. WI and W2 together produce high heat. This
option provides no value with single-stage furnaces because only
1 value of heat is available.
Above this point, the heat pump is the most cost efficient to
operate, and below this poinL the furnace is the most cost efficient
The selection choices guarantee selected outputs will be on during
defrost. If room temperature demand requires additional heat, it
CAPACITY
BALANCE
wiltbesupplied,
resulting in additional outputs being turned on, If
room overheats, specified outputs will not turn off, guaranteeing a
sufficiently warm leaving air temperature during defrost. Temperature overshoot during defrost can occur, but is almost never
noticeable because of the short duration of the defrost cycle (4
that it cannot switch between heat and cool without a 20 minute
"off" time between the 2 operations. Specifically, to switch from 1
mode to the other, there must be no demand for the old mode and
a demand for the new mode. and this must exist continually for 20
minutes before transition to the new mode will occur.
minutes typical,
TO SELECT:
10 minutes maximum).
An additional feature of Thermidistat Control defrost is that it
always allows defrost cycle to run to completion. The Thermidistat
Control leaves the Y output on as long as outdoor unit holds
voltage on the O line. even if it is satisfied. This prevents
premature termination of defrost cycles, which occur with normal
thermostats.
I. 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 14.
2. Press SET T1ME/TEMP
3. Use up or down buttons to move between 0, 1.2.3,
on large display. Factory default is 2.
TO SELECT:
Option 15---Enable Auto Mode
button once to flash large display.
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).
3. Use up or down buttons to move between 0, 1, 2, or 3 (if
available) on large display. See Table 1 for effect of these
choices. 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
13---Room
Temperature
TO SELECT:
Offset Adjust
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small Inow flashing) display indicate 15.
This option allows calibration (or deliberate miscalibration) of
room temperature sensor. There are various reasons why homeowners may want to have displayed temperature adjusted to a
higher or lower value. The selected number is number of degrees
farhenbeit, plus or minus, which will be added to actual temperature. The numbers can range between -5 and +5. Factory default is
0. This adjusted value will be used as actual temperature for both
display and control action. For example, if 2 is selected, 72°F
actual will read 74°F. If set point is 72°F, the room will control to
an actual temperature of 70°F which will be displayed and acted
upon as if it were 72°F. The effect is that a positive number
selection will make the room temperature lower and vice versa.
The Thermidistat Control is calibrated within an accuracy of plus
or minus I°F when shipped from the factory, so this adjustment
will provide the best accuracy when set to 0.
2. Press SET TIME/TEMP
4. Press SET TIMEFI'EMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 16--Enable
Super Comfort Heat Mode
--->This option requires prior ON selection of heat pump (DIP switch
No. 1) and Configuration Option No. 5 (Select Variable-Speed
Blower). Super Comfort Heat mode is part of the Comfort Heat
Pump system, which comprises a selected combination of Thermidistat Control, variable speed Fan Coil, and 3-stage electric
heater to provide superior heat pump leaving air temperatures
under all conditions. This option selection modifies heat pump
blower and auxiliary heat operation to contribute to comfortable
leaving air temperature. Specifically, this selection provides:
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 13.
button once to flash large display.
3. Use up or down buttons to move between -5, -4, -3, -2, -1, O,
1, 2, 3, 4, or 5 on large display. Factory default is O.
•
Reduced heat pump airflow for outdoor temperatures
12° and 40°F.
between
•
At least 1 stage of electdc heat ON for all heating below 12°F.
-'-)'While outdoor air temperature is between 12°F and 40°F, the
Therraidistat Control removes the G signal during heat pump
heating. The 40FK, FK4C, or FV4A Variable-Speed Fan Coils
respond by reducing their airflow in the absence of the G signal,
raising leaving air temperature. For any heating demand below
12°F, G and W/WI are turned ON. assuring at least 1 stage of
electric heat is on, and also increasing leaving air temperature.
4. Press SET TIMFdTEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
Option 14---HeaffCool
button once to flash large display.
3. Use up and down buttons to move between OF and ON on
large display. Factory default is ON (AUTO enabled).
TO SELECT:
2. Press SET TIMFJI'EMP
4, 5, or 6
4. Press SET TIMFJTEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
1. Enter configuration mode if not already there. See Step 4 "To
Enter Configuration Mode." Use up and clown buttons to make
small (now flashing)display indicate 12.
2. Press SET TIME/TEMP
button once to flash large display.
Dead Band Adjustment
This option selects the minimum difference between heat and cool
set points. A larger difference saves energy and a smaller difference decreases temperature difference between heating and cooling. Factory default is 2, which means cooling set point must be a
minimum of 2" above heating set point. An attempt to move them
closer will result in one "pushing" the other to maintain the
required difference.
As part of the Comfort Heat pump system. Configuration Option
No. 9 (Intelligent Heat Staging) should also be set to ON if the heat
pump is single stage and a 3-stage heater is present.
TO SELECT:
I. 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 16.
Depending on set points, moving dead band closer than 2 ° may
resuR in regular cycling between heat and cool when AUTO mode
is selected, However, this cycling cannot occur more often than 1
transition every 20 minutes. The system has a built-in requirement
2, Press SET TIMFdTEMP but_n
6
once to flash largo display.
NON-PROGRAMMABLE
CONFIGURATION
{OPTION 17 ONI
PROGRAMMABLECONFIGURATION
(OPTION 17 OFF)
Agg059
Fig. 2--Programmable/Non-Programmable
3. Use up and down buttons to move 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 17--Enable
Non-Programmable
Operation
This option converts the programmable Thermidistat Control to a
non-programmable
control for those users who do not want
programmability. The clock is retained, but the days of the week
and the daily schedules have been eliminated, making it operate as
if HOLD were permanently ON. Some of the buttons (used in
programming only and now not needed) are redefined to simplify
the non-programmable operation. To match these redefined buttons, a new keypad label, included with the Thermidistat, must be
placed over the original keypad label. Fig. 2 shows both the
original keypad label and the non-programmable keypad label.
When this option is selected, the new keypad label must be applied
over (or in place of) the original. Because these adhesive-backed
keypad labels are not designed to be removed, this conversion
should be considered permanent. Once the change to nonprogrammable operation is done, a procedure is not provided to
easily change it back. Should this change be needed, it is best to
trade the Tharmidistat for one which has not been converted.
Keypad Labels
I. Enter configuration mode if not already them. See Step 4 "To
Enter Configuration Mode." Use up and down buttons to make
small (now flashing) display indicate 17.
2. Press SET TIME/TEMP
button once to flash large display.
3. Use up and down buttons to move between ON and OF 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.
REDEFINITION
OF BUTFONS
Fig. 2 shows the original (programmable) button labels on the left
and the redefined (non-programmable) buttons on the right. In the
figure, the buttons are numbered for easy reference. They are not
numbered on the actual product. Six of the buttons (numbers 1
through 5 and 9) have been redefined.
Button 3 originally altematod
heat set point with each press.
point, button 2 selects the heat
now used only to set the clock.
gone.
between time, cool set point, and
Now, button 1 selects the cool set
set point, and button 3 selects time.
Note that the days of the week ate
Button 5 used to alternate between humidify and dehumidify. Now
button 4 selects dehumidify and button 5 selects humidify.
Both programmable and non-programmable versions of the Homeowner's Manual are available. Be sure to leave only the correct
version of the Homeowner's Manual with the homeowner.
Button 9 now loses the HOLD label, making it END only. This
button is only used to END the humidity screen and the configuration mode.
Once it has been determined that a particular installation is to be
made non-programmable, the only changes required are:
These changes both simplify operation for the homeowner and find
use for the buttons which are no longer needed when programmability is removed.
•
•
Attach non-programmable keypad label over original programmable one.
Attach non-programmable
of door.
start-up sticker instructions
•
Set Configuration Option No. 17 to ON.
•
Leave non-programmable
owner.
homeowner's
Start-Up and Checkout
to back
The Thermidistat Control is designed with a built-in installer test
capability. It allows easy operation of equipment without delays or
set point adjustments to force heating or cooling.
manual with home-
To enable installer test mode, move DIP switch No. 4 to ON
position. To access this switch, open case as described in Step 2.
Use the corner of a small screwdriver to slide switch No. 4 to ON
position.
To attach the provided non-programmable keypad label, caretillly
peel off its backing and apply it over the original keypad label.
PLEASE HEED: Once the new keypad label makes contact, it will
stick fitrrdy in place and adjustments cannot be made. CAREFULLY locate an edge of the keypad label, making sure its
position and orientation are correct. Then, from the attached edge.
smooth the rest of the keypad label over the original. Make sure the
new keypad label does not interfere with the motion of the buttons
which it surrounds.
TO SELECT:
Step 5--System
While in installer setup mode, clock will display "lnSt," FAN
button will control fan, and MODE button will control heating and
cooling.
TO TEST FAN:
Fan button switches FAN icon between AUTO and ON. While ON
is displayed, G output will be on, turning fan on. Allow up to 10
see after button is pressed for fan to turn on and off. On some fan
coils, fan continues to operate for 90 sec after G signal is removed.
Table 2---Equipment
1-SPEED
Cool--O
to 2 minutes
Y,G
Coo1_2
to 4 minutes
Y,G
Heat--O to 2 minutes
Heat--2
to 4 minutes
Eheat---0
to 2 minutes
Eheat--2
to 4 minutes
AC
Outputs
2-SPEED
AC
1-SPEED
Y1,G
Y1, Y2, G
HP
2-SPEED HP
Y,G,O
Y1, G, O
Y,G,O
Y1, Y2, G, O
W1
Wl
Y, G
Y1, G
Wl, W2
......
Wl, W2
Y, G
Wl
Y1, Y2, G
Wl
......
Wl, W2T
Wl*
• Two-stage heatnotava_able
NOTE:
For Y_Jse
for O--use
terminal Y/Y2, for Y1---use temlinal Y1/W2, for W2---use terminal O/W2,
terminal O/W2, for W f--use terminal W/Wt, for W2t use terminal ¥ t/W2
TO TEST COOLING
AND DEHUMIDIFICATION:
Press MODE button until COOL icon turns on. Cooling begins
within 10 sec and remains on for 4 minutes. If system is 2-speed,
low speed comes on for first 2 minutes, followed by high speed for
second 2 minutes. At the end of 4-minute run, cooling stops, and
MODE reverts back to OFF. At any time during 4-minute run time,
cooling may be turned off by pressing MODE button until OFF
appears. While cooling is on, successive presses of HUMIDITY
button turn dehumidify output on and off. While this output is
active, "dh" appears in cool set point display. Equipment outputs
for different equipment types are listed in Table 2.
TO TEST PRIMARY HEATING AND HUMIDIFICATION:
Press MODE button until HEAT icon turns on. Primary heating
begins within 10 sec and remains on for 4 minutes. This will be
furnace or electric beat in AC system and heat pump heating in
heat pump system. If system has 2 stages of primary heat. first
stage will be on for 2 minutes followed by second stage for 2
minutes. At the end of 4-minute run, heating stops, and MODE
reverts back to OFF. At any time during 4-minute run time, heating
may be turned off by pressing MODE button until OFF appears.
While heating is on, successive presses of HUMIDITY button turn
humidify output on and off. While this output is active, "ha"
appears in heat set point display. Equipment outputs for different
equipment types are listed in Table 2.
TO TEST AUXILIARY HEATING:
Auxiliary heating only exists in heat pump systems. To test, press
MODE button until EHEAT icon rams on. This will be nlectdc
heat in standard heat pump systems and furnace in dual fuel
systems. Auxiliary heating begins within 10 sec and remains on for
4 minutes. If there are 2 stages of auxiliary heat, first stage comes
on for 2 minutes followed by second stage for 2 minutes. At the
end of 4-minute run, heating stops and MODE reverts back to
OFF. At any time during 4-minute mn time, heating may be turned
off by pressing MODE button until OFF appears. Actual outputs
for different equipment types are listed in Table 2.
Step 6--Final
Table
The default set points and programmed schedule conform to the
Energy Star_ requirements of the U.S. Department of Energy for
beth heating and cooling. These provide energy saving temperature settings. Refer to Table 3.
If programmed schedule is to be used, make sure HOLD icon is
off. This feature is turned on and off by HOLD button.
If fixed temperatures are desired, use HOLD button to turn on
HOLD icon. This will maintain set points, not allowing them to
change with programmed schedule.
Star Default
Schedule
SCHEDULE
I
HEAT
COOL
Day 8:00 AM
Evening
5:00AM
PM
Wake 6:00
Sleep 10:00 PM
I
60°F
68°F
68_F
60°F
85°F
78°F
78°F
82°F
The FAN button may be used to select between AUTO (fan on
only with equipment) and FAN (fan on continuously) fan modes.
For further information on temperature selection and programming, refer to Homeowner's Guide.
HUMIDITY CONTROL FEATURES
The various humidity control features of the Thermidistat Control
are explained below. They are grouped into 2 sections: humidification and dehumidification. At the end of each sectina, instructions on how to select each feature are given.
HUMIDIFICATION
The Thermidistat Control directly connects to a standard 24-vac
humidifier to control humidification in the home. A humidify set
point between 10 and 45 percent relative humidity is selected by
the homeowner, or all humidification can be tamed off. When
humidity in home drops below set point, humidifier will be turned
on to raise humidity level. Humidification can only occur in
heating mode (HEAT or AUTO/HEAT). Five different humidification selections are available and are described below.
l. Normal Humidify
In normal humidify, humidifier will be on if there is a
humidity demand and any heating equipment is oil This will
include furnace, heat pump. or auxiliary heat. In heat pump
applications, this is an improvement over using an external
humidistat, which only supplies humidity when auxiliary heat
is on,
2.
Settings
Be sure to return DIP switch No. 4 back to OFF position to exit
installer setup mode. Assuming system is to be left in operation
after installation is complete, use MODE button to select between
HEAT, COOL, or AUTO to provide desired operation of heating,
cooling, or both.
3--Energy
3.
Fan Humidify
This configuration allows a humidify demand m turn on fan
and humidifier together, even if there is no heat demand. It is
particularly useful when the furnace is oversized, resulting in
short heating cycles. It allows the humidifier to run longer,
supplying more humidity to the home. Note that fan hours will
increase, using more electricity. Also, the humidifier delivers
less moisture to cooler air than it does to heated air.
Auto Humidify
This feature is designed to eliminate the problem of sweating
windows in very cold weather. When selected, the set point is
automatically reduced by 1 percent for every drop of 2°F in
outdoor temperature between 50°F and 0°F. The set point may
be changed at any time, and it will continue to track outdoor
temperature from the new set point and current outdoor
temperature. The adjusted set point range is still limited to
between 10 and 45 percent relative humidity. To use this
feature, an outdoor temperature sensor MUST be attached. If
not, E3 error message will be displayed.
Table 4--Humidification
Selections
SELECTION
MODE DISPLAY
FAN DISPLAY
HUMIDIFY SET POINT
DISPLAY
Normal Humidify
Blank
Blank
Humidify Set Point Value
Fan Humidify
Blank
FAN
Humidify Set Point Value
Auto Humidify
AUTO
Blank
Humidify Set Point Value
Auto and Fan
AUTO
FAN
Humidify Set Point Value
Humidify Off
Blank
Blank
OF
4. Auto and Fan Humidify
The cool to dehumidify selection tells the system to operate
the compressor, within limits, when there is a dehumidify
demand even if there is no cooling demand. The limits are that
the system may overcool up to 3°, but no more. while
attempting to satisfy a dehumidify demand. Within this 3 °
range, there is an additional balance between overcooling and
humidity satisfaction. When overcooling
must occur, the
dehumidify set point is adjusted upward by 2 percent per
degree of overcooling. For example, a cooling set point of
76°F and a dehumidify set point of 60 percent is equivalent to
a cooling set point of 75°F and a dehumidify set point of 62
percent. This dehumidify set point change is internal to the
Thermidistat Control and is not shown on the display.
The 2 choices of AUTO and FAN can be selected together.
This provides both functions simultaneously.
5. Humidify Off
The humidify function can be turned offcompletely.
not require changing existing set points.
This does
To Select Humidification (Between NORMAL, FAN, AUTO,
FAN and AUTO, or OFF) (See Table 4.)
Press HUMIDITY button to bring up humidity select screen. It is
indicated by "hu" or "dhu" in clock display. Successive presses
will change between "hu" and "dhu" in clock display. Select "hu"
for humidity functions. The large display shows actual humidity
level. The smaller display (in heat set point location) shows
humidity set point (Humidify Set Point) or OF (off). When
Humidity Set Point value is displayed, its value can be changed
with up and down buttons. Successive presses of MODE button
will move between 5 choices described above and each will be
indicated as shown in Table 4.
During cool-to-dehumidify
demand, the compressor runs a
maximum of 10 minutes on, followed by 10 minutes off.
When the compressor turns off, the fan (G output) is also
turned off immediately. The immediate fan shutoff prevents
re-evapormion of water on the coil, improving dehumidification. If fan is set to continuous, the G (fan on) signal is
removed for 5 minutes starting when compressor turns off.
To exit humidity select screen, press END button.
Additional
In most furnaces and fan coils, the blower operates for 90 sec
after beth Y and G disappear. This 90-see delay should be
removed, if possible, for maximum dehumidification performance. Consult furnace or fan coil Installation Instructions to
see if delay can be disabled.
Humidify Comments
The humidifier is actually turned on when humidity is 2 percent
below set point and turned off when it reaches 2 percent above set
point. This built-in hysteresis prevents humidify output from
toggling on and off when humidity level is near set point.
3.
The vacation mode provides some additional humidification functions. These are specially designed to provide protection for an
unoccupied home while simultaneously minimizing energy use.
Refer to "Vacation" section for additional information.
Dehumidify
Off
Dehumidification can be turned off completely.
done without changing existing set points.
To Select Dehumidification
and OFF)
DEHUMIDIFICATION
(Between
NORMAL,
This can be
COOL
TO,
Press HUMIDITY button to bring up humidity selections. Successive presses will show "hu" or "dhu" in clock display. Select "dhu"
for dehumidify selections. The large display shows actual humidity
level. The smaller display (in cool set point location) shows
dehumidify set point (DSP) or OF (off). When DSP value is
displayed, its value can be changed with up and down buttons.
Successive presses of MODE button moves between 3 choices
above and each will be indicated as in Table 5.
Dehumidification is done only during cooling. Depending on type
of equipment used, compressor speed, blower speed, set point
adjustment, and equipment cycling are modified to provide added
dehumidification. A dehumidification set point (separate from
humidification set point) is available to the homeowner. It can
range from 50 to 90 percent relative humidity. When actual
humidity is higher than set point, a dehumidification demand
exists. The TbermidistaI Control responds by activating its dehumidify output. It may also control the compressor and blower,
depending on equipment type and dehumidify selection choice.
The 3 available selections are described below.
Superdehumidify
(With Cool to Dehumidify)
This selection only affects cool-to-dehumidify
operation. It is part
of the installer setup (see Configuration Option No. 7) and must be
made by installer. The Homeowner's Guide does not cover this
selection. A requirement is the use of a variable-speed indoor unit
with supordehumidify capability. During cool-to-dehumidify call,
it provides maximum dehumidification
by reducing airflow to a
minimum. The actual superdehumidify command from Thermidistat Control to the indoor unit is a Y signal without a G signal in
addition to dehumidify signal. The indoor unit responds to this
combination by reducing the airflow to a minimum. All other
characteristics of cool to dehumidify are the same.
The amount of extra dehumidification available is very dependent
on the type of equipment in the home. Without a variable-speed
blower, the system's ability to adjust dehumidification is very
limited.
I. Normal Dehumidify Operation
When normal dehumidify is selected, the compressor will not
turn on without a cooling demand. If dehumidify demand
exists while cooling, dehumidify output will also be active
(24vat removed). This output commands variable-speed
blowers to reduce Iheir airflow, which improves water removal from the cooled air.
Additional
Dehumidify
Comments
Dehumidification can be enhanced (with some €fficiency loss) by
turning blower off immediately at the end of each cooling cycle
(eliminating normal 90 sec blower off delay). Where maximum
2. Cool to Dehumidify
9
Table
5---Dehumidification
Selections
MODF DISPLAY
FAN DISPLAY
DEHUMIDIFY SET POINT
DISPLAY
Normal Dehumidify
Blank
Cool to Dehumidify
COOL
Blank
Blank
Blank
Dehumidif,/Set Point Value
Dehumidify Set Point Va)ua
OF
SELECTION
Oehumidify
OFF
Blank
Carrier 58MVP Furnaces also have a DEHUM input. The DEHUM input acts differently depending on which style of variablespeed fumace control you have. The older style variable-speed
furnace comml DOES NOT have a DE connection while the newer
style variable-speed furnace control has a DE connection. Both of
these variable-speed furnace controls function the same except the
DEHUM logic is reversed.
humidity removal is desired, this should be done, if possible. Fan
coils have the capability of removing this off delay, furnaces do
not. On FK or FV Fan Coils, set delay tap to 0/0. On standard fan
coils, a jumper can be cut to disable off delay. Refer to fan coil
Installation Instructions for details. If FAN is set for continuous
operation (fan ON icon displayed), G output is tamed off for 5
minutes at the end of each cooling cycle as long as dehumidify
demand exists.
On the older style variable-speed
furnace controls, a fieldsupplied relay is required between the Thermidistat Control
and furnace. The relay coil is connected between DHUM output
on the Thermidistat Control and COM terminal on the furnace
control. Its normally closed contact is connected between R and
DEHUM terminals on the furnace control, where the DEHUM
terminal is a spade lug located next to the transformer secondary
connections. (See Wiring Diagram Reference Chart and Fig. 21
through 24 in Wiring Diagram literature). When a dehumidify
demand exists, relay is de-energized, and normally closed contacts
supply 24vat to the furnace DEHUM terminal. As a result the
furnace control reduces the blower airflow by 15 percent.
Like humidify, dehumidify actions are initiated when humidity is
2 percent above set point and are terminated when humidity drops
to 2 percent below set point. This prevents unnecessary toggling of
dehumidify actions when humidity is near set point.
The vacation mode contains additional dehumidify features designed to protect an unoccupied home. Refer to the "Vacation"
section for additional information.
With any dehumidify selection, if the system has a 2-speed
compressor (DIP switch No. 2 is ON) and does NOT have a
variable-speed blower (Configuration Option No. 5 set to OFF), all
cooling will be done at high speed while dehumidify demand
exists. This is because the combination of 2-speed compressor
without variable-speed blower generally has poor water removal
on low speed.
Dehumidify Output and Equipment
On newer style variable-speed
furnace controls, a fieldsupplied relay IS NOT required. The DHUM output on the
Thermidistat Control is instead connected directly to the DEHUM
terminal on the furnace control, where the DEHUM terminal is a
spade lug located next to the transformer secondary connections.
In addition the DE jumper located next to the DEHUM terminal
must be removed to enable the DEHUM input. (See Wiring
Diagram Reference Chart and Fig. 25 through 28 in Wiring
Diagram literature). When a dehumidify demand exists the furnace
control reduces the blower airflow by 21 percent.
Connections
When there is a dehumidify demand, dehumidify output is
activated, which means that a 24-vac signal is removed from the
DHUM output terminal. In other words, dehumidify output logic is
reversed -- output is turned ON when no dehumidify demand
exists and is tamed OFF when demand exists. This logic reversal
has come about from historical use of a standard humidistat to do
dehumidification. The humidistat contacts open on high humidity,
thus removing a 24-vac signal to initiate dehumidification. Equipment has been designed to operate in this manner, so the
Thermidistat Control must now accommodate the existing equipment.
VACATION
A vacation selection is available specifically for times where the
home will not be occupied for an extended period. For convenience. 1 button selects vacation mode which is indicated by OUT
icon on display. Vacation mode also has an automatic hold,
meaning that set points are not affected by the programmed
schedule. While in vacation mode, the system provides temperature and humidity protection for the home in all seasons, but not
comfort.
Carrier FK and FV Series Variable-Speed Fan Coils, all 58UHV
and 58UXV 80% Variable-Speed Furnaces, and 58MVP 90%
Variable-Speed Furnaces with the DE connection have dehumidify
inputs which connect directly to Thermidistat Control DHUM
output. They are compatible with the reverse logic output and will
reduce their cooling CFM by approximately 20 percent when a
dehumidify demand is present.
The FK and FV Series Fan Coils have a terminal marked DH
which should be connected to the Thermidistat Control DHUM
Vacation Set Points
A special set of temperature and humidity set points exists which
are active in vacation mode. They are adjustable by the homeowner, are exclusively for vacation mode, and are remembered
from 1 vacation selection to the next. These set points will be
higher for cool and dehumidify and lower for heat and humidify
than those of occupied mode.
output. Jumper J1 on fan coil MUST be removed. It is located
behind the DH terminal. Additionally blower delay tap on fan coil
should be set to (3/0 (no ON delay and no OFF delay) when using
cool to dehumidify. With this selection, the blower stops when G
signal is removed, preventing re-evaporation of water from the coil
which would occur during the normal 90 sec blower off delay. (See
Wiring Diagram Reference Chart and Fig. 5 through 8 in Wiring
Diagram/iterature).
Vacation Humidification
Normal humidify is available, using vacation set points. Humidification by fan only is not available as vacation selection. Auto
humidification is available, adjusting its set point with outdoor
temperature the same as when occupied. The maximum humidity
set point can be adjusted separately from the occupied value, but
it must always be less than occupied value. This allows humidification to track outdoor temperature identically, whether occupied
or vacation, but allows maximum humidification to be less when
unoccupied. Vacation humidification can be turned off independently of occupied humidification.
On 58UHV and 58UXV Furnaces, a green wire marked DHUM is
connected to a spade lug which is connected to the G input
terminal. Unplug spade lug, cut off spade receptacle from wire
end, and splice a wire between green DEHUM wire and Thermidistat Control DHUM terminal. (See Wiring Diagram Reference
Chart and Fig. 17 through 20 in Wiring Diagram literature).
10
Thermidistat
Control
Troubleshooting
WHAT TO CHECK
SYMPTOM
Open Thermidistat Control.
sure pins on board engage
NO display
"-" ia p_ace of room
_mpe_
"E3" ar "-" in place of outdoor
"E4" or "E5"
temperature
Control cannot propedy
Filter timer has expired.
will not come on
or dehumidify
Cot_ttel c_r_ot _rG_yd£ re._d re_'# tert_ec_tuce.
_ermidistat
System is Stuck in defrost.
"Clean Filter" icon displayed
Humidify
Thecmi_st_t
Internal failure. Replace Thermidistat
"E6"
Cooling or heating
Check for 24vac between R and C at screw terminals on mounting base. Reassemble.
sockets in mounting base. If display does not appear, replace Thermidistat Control.
will not come on
See Installer Setup
Control.
Check outdoor sensor and its wiring.
Control.
Check wiring and heat pump defrost control board.
Clean
or replace filter and then press VACATION
to force heating or cooling.
and HOLD/END
Check for 24vac at equipment
terminals.
See installer Setup to force HUM or DEHUM. Check for 24vac at equipment terminals.
Vacation Dehumidification
located
under
Normal Dehumidify, Cool to Dehumidify, and Dehumidify OFF,
are all available in vacation mode, and selection of I of these can
be different from that of occupied. Vacation dehumidification
selection and set points are remembered the next time vacation is
used.
hncticate
section.
state
HUMIDIFY
heat
of
AND
set point.
humidiD'
These
and
DEHUMIDIFY
buttons together to reset•
It not present, check wiring.
If not present, check wiring•
2 arrows
dehumidify
are also used
¢ntq_u_s. See
to
next
INDICATORS
The humidity screen (selected by pressing the HUMIDITY button)
uses the same triangles referenced in the above paragraph to
indicate the state of the HUM and DHUM outputs. When
humidification or dehumidification is active, the triangle under its
set point is turned on.
Cool to dehumidify operates slightly differently, allowing the
home to be cooled to as low as 70°F when trying to achieve
dehumidify set point. The balance between dehumidify and
temperature set point adjustments is 1 percent set point increase
per degree of overcooling for temperatures below 76°F. For
example, at 74°F dehumidify set point is raised 2 percent, and at
72°F dehumidify set point is raised 4 percent. At temperatures
above 76°F, dehumidify set point is not changed.
OPERATIONAL
Re#ta_e _at
read outdoor temperature.
AUTO CHANGEOVER
When auto changeover mode is selected, a change from heat to
cool (or vice versa) will not occur until an opposite mode demand
has existed for 20 minutes. If set point is changed. 20-minute
requirement is deleted.
INFORMATION
EMERGENCY
FIVE-MINUTE COMPRESSOR TIMEGUARD
HEAT MODE
This timer prevents compressor from starting unless it has been off
for at least 5 minutes. It can be defeated for 1 cycle by
simultaneously pressing FAN button and INCREASE TEMPERATURE button.
When Thermidistat Control is configured as a heat pump and
emergency heat is selected, all Y signals are locked out, and W
becomes energized aport a call for heat.
FIFIEEN-MINUTE
When AC power is first applied, all segments of display are turned
on for a few seconds. Following this, temperature display indicates
model/configuration via following 2-digit code:
POWER
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 hr.
This timer is defeated for 1 cycle when desired temperature is
manually changed. It can also be defeated for 1 cycle by
simultaneously pressing FAN button and INCREASE TEMPERATURE button.
FIFI'EEN-MINUTE
THREE-MINUTE
MINIMUM
ERROR CODES
....
If Thermidistat Control cannot properly read room temperature, display will indicate -- and all outputs (except
fan if on) will turn off.
El, E2 -- There is no El or E2 error message.
E3 -- If Thera_ddistat Control canrtot properly' read outdoor
temperature, and it is needed for proper operation, display
will indicate E3.
E4 -- If Thermidistat Control's internal memory fails, F_Awill be
displayed. Replace Thermidistat Control.
E5 -- If Thermidistat Control cannot properly read humidity. E5
wilI be displayed. Replace Thermidistat Control.
E6 -- If defrost cycle continues for longer than 15 minutes. E6
will be displayed. Check heat pump wiring or for failed
heat pump defrost control.
prevents any higher
has been on for 15
error is greater than
temperature).
ON TIME
In normal operation, when a stage turns on, it will not turn off for
a minimum of 3 minutes. If the set point is changed, this timer is
automatically canceled, allowing the equipment to turn off inunediately when the demand is removed.
HEAT/COOL SET POINTS
ON CHECK
AC--l-speed
air conditioner, HP--l-speed
heat pump, A2--2speed air conditioner. H2_2-speed heat pump. HS--l-speed heat
pump with 3-stage auxiliary heat, dF_ual
fuel, d2--
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