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Cancels: II TSTAT-0-22 I I TSTAT-0-27
8-99
NOTE: Read the entire instruction manual before starting the
installation.
This symbol -+ indicates a change since the last issue.
INDEX
Page
SAFETY CONSIDERATIONS ..................................................... 1
INTRODUCTION .......................................................................... 1
INSTALLATION CONSIDERATIONS ....................................... 1
INSTALLATION.. ..................................................................... .2-7
Thermidistat Control Location ................................................ .2
Set DIP Switches ..................................................................... .2 HEIGHT (IN.) 1 WIDTH (IN.) 1 DEPTH (IN.)
Install Thermidistat Control ................................................. .2-3 4-318 I 7-318 l-318
Set Thermidistat Control Configuration .............................. .3-8
System Start-Up and Checkout.. .......................................... .7-8 Fig. 1-Thermidistat Control
Final Settings ........................................................................... .8
PERFECT@ HUMIDITY CONTROL FEATURES .............. .8-10 INSTALLATION CONSIDERATIONS
Humidification .......................................................................... . A. Power
Dehumidification ................................................................ .8-10
Note that this control does not require batteries and is not "power
Vacation ................................................................................ .10
OPERATIONAL `INFORMATION ........................................ lo- 11 stealing." It does require 24vac (R and C terminals) of the
THERMIDISTAT CONTROL TROUBLESHOOTING ........... .l 1 low-voltage transformer to be connected to it for proper operation.
It will not operate without these 2 connections.
THERMIDISTATs CONTROL CONFIGURATION RECORD. 12
WIRING DIAGRAMS ............See Thermidistat Wiring Diagrams B. Models
There is a single programmable/non-programmable model for all
`SAFETY CONSIDERATIONS
applications. It can be configured for AC or HP, l- or 2-speed
Read and follow manufacturer instructions carefully. Follow all
compressor, and for dual fuel installations, allowing it to be used
local electrical codes dur$rg installation. All wiring must conform
in place of all Bryant thermostats.
to local and national tion may damage Thermidistat Control. C. Humidify Equipment and Connections
Recognize safety information. This is the safety-alert symbol A . The humidify output connects directly to 24vac operated humidi-
When you see this symbol on the equipment and in the instruction tiers. No other connection or interlock is required. Any of several
manual, `be alert to the potential for personal injury. installer-selectable operating modes are available.
Understand the si nal words DANGER, WARNING, and CAU-
TION. These wo K s are used with the safety-alert symbol. DAN- WARNING: DO NOT connect Furnace HUM terminal
GER identifies the' most serious hazards which will result in severe directly to Thermidistat HUM terminal. This will bypass
personal injury or death. WARNING signifies a hazard which furnace safety controls. See Low Voltage Winng
could result in personal injury or death. CAUTION is used to Diagrams and notes for proper connection.
identify unsafe practices which would result in minor personal
injury or product and property damage. '
D. Dehumidify Equipment and Connections
!NTRODU&N
Bryant's 7-day programmable/non-programmable Thermidistat The dehumidify output connects to the dehumidify input on
Control is a wall-mounted, low-voltage control which combines variable-speed furnaces and fan coils. Additional dehumidification
temperature and humidity control in a single attractive unit. An is done by controlling the compressor. A variety of operating
extension of Bryant's proven line of thermostats, it' provides modes are available.
separate set points for heating and cooling, and now+addsJu&idi- E. Outdoor Temperature Sensor
fication and dehum$lification. Different heating and cooling set
Optimum performance is obtained when an outdoor temperature
points and times a$ programmable for 4 periods per day and 7
sensor is used with the Thermidistat Control. Plan installation so
days per week. The Thermidistat Control can also be field-
that 2 wires can be run from Thermidistat Control to an outdoor
con u'kdss,a non-programmable thermostat. When operating in
@ ,' location, preferably on the north side of the house or refer to
ths non-programmable configuration it will still have both tem-
Installation Instructions included with the outdoor t?mperature
per&me and humidity control, Humidify and dehumidify outputs
sensor for simplified connection. Sensor can be mounted to
provide direct control of h&d&y.. Batteries are not-used. During
outdoor unit and existing control wires may be used for its
power loss*jm internal memory store8programs and settings for
connection. Details are provided in sensor instructions.
l unlimir&d time, and the clock continues to run for at least 8 hr.
-
bi;. -l- .
*
."
i*
-INSTALLATION TO SET:
1. THERMIDtSTAT CONTROL LOCATION OFF--for normal operation. This is factory default.
ON-for installer test mode.
Thermidistat Con&o1 should be mounted:
Ill. INSTALL THERMIDISTAT CONTROL
l Approximately 5 ft `( 1.5m) from floor.
l Close to or in a frequently used room, preferably on an inside WARNING: Before installing Thermidistat Control,
partitioning wall.
l On a section of wall without pipes or duct .work.
Thermidistat Control should NOT be mounted:
l Close to a window, on an outside wall, or next to a door leading
to the outside.
1. Turn off all power to equipment.
l Exposed to direct light or heat from a lamp, sun, fireplace, or
other temperature-radiating objects which could cause a false 2. If an existing thermostat is being replaced:
reading. a. Remove existing thermostat from wall.
l Close to or in direct airflow from supply registers and return-air b. Disconnect wires from existing thermostat, 1 at a time.
registers. c. As each wire is disconnected, record wire color and
l In areas with poor air circulation, such as behind a door or in terminal marking.
an alcove. d. New or additional wire may be needed to a+commodate
II. SET DIP SWITCHES added humidity outputs.
There is a 4 section DIP switch within the Thermidistat Control e. Discard or recycle old thermostat. '
which must be properly set by the installer. It is easiest to set these NOTE: Mercury is a hazardous waste and M&T be disposed of
4 switches before the Thermidistat Control is mounted to the wall, properly.
so STOP and complete the following steps:
3. Select Thermidistat Control rear plastic. (If i't is not sepa-
1. Open hinged Thermidistat Control cover. rated from the remainder of the Thermidistat Control, refer
2. Remove cover completely by snapping it apart at hinge. to Step 2 above.)
3. Open Thermidistat Control by pressing back half of the 4. Route wires through large hole in rear plastic. Level rear
right end of plastic case inward while, at the same time, plastic against wall (for aesthetic value only-Thermidistat
pulling front and back halves apart at the right end. The 2 Control need not be leveled for proper operation) and mark
halves will swing apart. wall through 2 mounting holes.
4. Snap hinge apart to completely separate the 2 halves. 5. Drill two 3/16-in. mounting holes in wall where marked.
5. Switches are located in upper right comer of circuit board. 6. Secure rear plastic to wall with 2 screws and anchors
To change switch position, use comer of a small screw- provided. Additional mounting holes are available for more
driver to slide switch to opposite position. secure mounting if needed. Make sure all wires extend
through hole in mounting base.
6. After switches have been set, do not reassemble the 2
halves. The rear plastic will first be mounted to the wall. Adjust length and routing of each wire to reach proper
connector block and terminal on rear plastic with l/4-in.
A. Switch l-AC/HP Select extra length. Strip only l/4 in. of insulation from each wire
Use this switch to select between air conditioner and heat pump to prevent adjacent wires from shorting together when
systems. connected.
TO SET: Match and connect equipment wires to proper terminals of
OFF-for air conditioner installations. This is factory default. each connector block. (See Low Voltage Wiring Diagram
ON-for heat pump installations, using either a fan coil or furnace Reference Chart and Figs. 1 through 28 in separate Wiring
(dual fuel). Diagram literature). Remember R and C must be connected
B. Switch 2-l Speed12 Speed for proper operation.
This switch tells the system whether the compressor is 1 or 2 Improper wiring or installation may damage
speed. Thermidistat Control. Check to make. sure wiring is
TO SET:
OFl-for single-speed compressor. This is factory default.
ON-for 2-speed compressors, whether AC or HP.
C. Switch 3-Smart/Conventional Recovery
9. Push any excess wire into wall and againsirear plastic. Seal
Selects between conventional and smart recovery from setback.
h$e in wall to prevent air leaks. Leaks can affect operation.
Conventional recovery changes to new set point at programmed
time. Smart recovery, which is active in both heating and cooling, 10. RLattach Thermidistat Control body to rear plastic by first
starts 90 minutes earlier and smoothly adjusts set point so room reattaching hinge.
will arr~v at programmed temperature at programmed time.
.k 11. Close Thermidistat Control assembly, making sure pins on
TO SET: back of circuit board align with sockets in connector.
OFF-for mart recovery. This is factory default. 12. Turn on power to equipment. `.I
ON-for nventional recovery.
On pow& up, all display segments will light for 5 sec. For the next
D. Swit $ h 44nstaller Test OFF/ON 5 set, a 2-digit code appears on large display which identifies
Selects a pecial installer test mode which assists with system Thermidistat Control configuration:
startup an% checkout. See Step 5, System Startup and Check-out. 1. AC-for l-speed air conditioner
-2- *
2. HP-for l-speed heat pump press SET TIME/TEMP button once. The large display will now
3. A2-for 2-speed air conditioner flash, indicating that up and down buttons now control available
choices within that option. Each press of TIMEiTEMP button
4. H2-for 2-speed heat pump switches between available option (small display) and available
5. dF-for l-speed dual fuel selections within each option (large display).
6. d2-for 2-speed dual fuel D. Configuration Options - Selection:
7. HS-for l-speed heat pump with Intelligent Heat Staging OPTION l-ANTICIPATOR ADJUSTMENT
(3- stage auxiliary heat with 40FK, FK4C or FV4A Series This adjustment controls sensitivity and cycle rate of Thermidistat
fan coils.) Control. Higher numbers decrease sensitivity and slow cycle rate.
When this identifier disappears, normal operation begins. The Lower numbers increase sensitivity and cycle rate. However, a
MODE control should be set to OFF and FAN control to AUTO, limiting feature will not allow more than 4 cycles per hr, regardless
SO equipment does not start until further configuration and check-
of setting. Anticipator values can range from 1 to 9. Factory
out is completed. default is 3. This default selection provides optimum performance
in nearly all installations. Try it first. Do not change setting unless
IV. SET THERMIDISTAT CONTROL CONFIGURATION there is evidence of need to do so.
Configuration options, like DIP switch settings, are intended to be Unlike conventional anticipators, this setting is not determined by
selected at installation and normally are not modified by the current draw. There is no need to measure, know, or compensate
homeowner. These options are not discussed in the homeowner's for current draw. There is also no droop with this Thermidistat
manual and therefore must be made as part of the installation. A Control. Regardless of setting and number of stages, both heating
special procedure allows entry into the configuration mode. While and cooling will control to their respective set points.
in configuration mode, up to 17 selections can be made. A TO ADJUST:
description of each selection and how to use the configuration
Enter configuration mode if not already there. See Step 4
mode follows.
"To Enter Configuration Mode." The upper small (COOL
A. Configuration Options - Summary: set point) display will be flashing 1. If not, use up and down
Option l-Anticipator adjustment buttons to move it to 1.
Option 2-Clean filter timer adjustment Press SET TIME/TEMP button once to flash current
selection of 1, 2, 3, 4, 5, 6, r/, 8, or 9 on large display.
Option 3-EnglishiMetric selection Factory default is 3.
Option 4--Fan (G) ON with W selection Use up and down buttons to move between available
Option 5-Variable-speed blower present selection choices.
Option 6-Coaling lockout below 55" selection Press SET TIME/TEMP button again to flash upper small
Option 7-Variable-speed super dehumidification selection (only display for selection of another option, or press END to exit
available when variable-speed blower is used) configuration mode.
Option S-Auxiliary heat lockout temperature setting (only avail- OPTION 2-CLEAN FILTER TIMER
able when heat pump is used) Select hours of blower operation (heating, cooling, or fan) before
Option 9-Intelligent Heat Staging Selection (only available when CLEAN FILTER icon is displayed. With OFF selected, icon will
single-speed heat pump is used) never come on, disabling this feature. Time selection can range
Option lo--Dual Fuel selection (only available when heat pump is from 400 to 3600 hr by selecting numbers 1 through 9. (Time is
400 X number selected.) Factory default is 2 (800 hr). Recom-
used)
mended selections are: disposable filter400 to 800 hr, media
Option 1 l-Balance Point Setting (only available when dual fuel filter-1200 to 1600 hr, or electronic air cleaner-1600 to 2400 hr
is selected) of blower operation.
Option 12-Defrost heat selection (only available when heat pump TO SELECT OR ADJUST:
is used)
Enter configuration mode if not already there. See Step 4
Option 13-Room temperature offset adjustment "To Enter Configuration Mode." Use up and down buttons
Option l&-Heat/cool dead band adjustment to make small (now flashing) display indicate 2.
Option 15-Enable AUTO mode Press SET TIME/TEMP button once to flash current
Option 16-Enable Perfect Heat mode selection of OF, 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display.
Option 17-Non-Programmable selection Factory default is 2.
Use up and down buttons to move between available
B. To Enter Configuration Mode: *
choices.
Press and hold FAN button for approximately 10 set until COOL
Press SET TIME/TEMP button again to flash upper small
set point display indicates a flashing 1. The Thermidistat Control
display for selection of another option, or press END to exit
is now in configuration mode. It will automatically exit this mode
configuration mode.
if no button is pressed for 3 minutes. Pressing END button will exit
configuration mode immediately. OPTION 3-ENGLISH/METRIC
C. While in Configuration Mode: Select between Fahrenheit and Celsius operation. Factory default
is Fahrenheit.
The upper small (COOL set point) display indicates selected
TO SELECT OR ADJUST:
option number and large display indicates selection made within
that option. One of these will be flashing. The up and down buttons 1. Enter configuration mode if not already there. See Step 4
are used both to move between available options and to make "To Enter Configuration Mode." Use up and down buttons
selection for each option. When option number (small display) is to make small (now flashing) display indicate 3.
flashing, up and down buttons adjust it, moving between available 2. Press SET TIME/TEMP button once to flash current
option numbers. After desired option number has been selected, selection of F or C. Factory default is F.
-3-
3. Use up and down buttons to move between F and C on large call for cooling. Not all products with ICM blowers have this
display. feature. Check Installation Instructions for ICM air handler used.
4. Press SET TlMEVTEMP button again to flash upper small Select OF for normal operation (Y and G supplied on a cooling
display for selection of another option, or press END to exit call). Select ON for super dehumidification (Y with no G on a
configuration mode. dehumidify only call). Factory default is OF (off).
OPTION 4-FAN (G) ON WITH W TO SELECT:
This selection determines whether fan (G) output is to be ON or Enter configuration mode if not already there. See Step 4
OFF when any W (furnace or strip heat) output is ON. Most "To Enter Configuration Mode." Use up and down buttons
furnaces and fan coils manage their own blowers and do ,not to make small (now flashing) display indicate 7.
require separate G signal. For these applications, select OFF. Some
auxiliary heaters require separate G signal to turn on blower. In Press SET TIME/TEMP button once to flash large display.
this case, select ON. Factory default is OF (off).
Use up or down buttons to alternate between OF and ON on
TO SELECT: large display. Factory default is OF.
Enter configuration mode if not already there. See Step 4
Press SET TlME/TEMP button again to flash upper small
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 4. display for selection of another option, or press END to exit
configuration mode.
Press SET TIME/TEMP button once to flash large display.
OPTION 8-AUXILIARY HEAT LOCKOUT SETTING
Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF. This option requires prior selection of heat pump (DIP switch l--
Press SET TIME/TEMP button again to flash upper small ON). It allows selection of an outdoor temperature of 5" through
display for selection of another option, or press END to exit 55°F. (or equivalent values in C), or OF (off). Auxiliary heat
configuration mode. (furnace in Dual Fuel applications) is prevented from operating for
outdoor temperatures above selected temperature. If OF (off) is
OPTION 5-VARIABLE-SPEED (ICM) BLOWER selected, auxiliary heat (furnace if Dual Fuel) operation is allowed
If furnace or fan coil contains a variable-speed (ICM) blower, set at all outdoor temperatures. If selected, emergency heat (EHEAT)
this option to ON. For normal (PSC) blowers, set to OF. This overrides this feature. Factory default is OF (off). This setting can
selection enables system to use special features available only in only be equal to or above the setting choice made for Option 11.
units with an ICM blower. Factory default is OF (off). Moving this setting lower may `push' Option 11 setting down-
TO SELECT: ward.
1. Enter configuration mode if not already there. See Step 4 TO SELECT:
"ToFnter Configuration Mode." Use up and down buttons Enter configuration mode if not already there. See Step 4
to make small (now flashing) display indicate 5. "To Enter Configuration Mode." Use up and down buttons
2. Press SET TIME/IEMP button once to flash large display. to make small (now flashing) display indicate 8.
3. Use up or down buttons to alternate between OF and ON on Press SET TIME/TEMP button once to flash large display.
large display. Factory default is OF.
Use up or down buttons to move between OF, 5, 10, 15,20,
4. Press SET TIMEEMP button again to flash upper small
25, 30, 35, 40, 45, 50, or 55 on large display. Factory
display for selection of another option, or press END to exit default is OF.
configuration mode.
Press SET TIMFfIEMP button again to flash upper small
OPTION 6-COOLING LOCKOUT BELOW 55°F
display for selection of another option, or press END to exit
This option disables cooling when outdoor temperature is below configuration mode.
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. OPTION g--INTELLIGENT HEAT STAGING
Factory default is OF (off).
This option requires prior selection of single-speed heat pump
TO SELECT: (DIP switch I-ON, DIP switch 2-OF). It provides 3 stages of
1. Enter configuration mode if not already there. See Step 4 electric heat from WI and W2 by sequencing WI only, then W2
"To Enter Configuration Mode." Use up and down buttons only, then both WI and W2. See FK or FV Series Fan Coil
to make small (now flashing) display indicate 6. Installation Instructions for further information. For S-stage heat,
select ON. For normal I- or 2-stage heat, select OF. Factory
2. Press SET TIME/TEMP button once to flash large display.
.' default is OF (off).
3. Use up or down buttons to alternate between OF and ON on
TO SELECT:
large+splay. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small Enter configuration mode if not already there. See Step 4
display for selection of another option, or press END to exit "To Enter Configuration Mode." Use up and down buttons
configuration mode. to make small (now flashing) display indicate 9.
QPTlbN 77VARIABLE-SPEED
-,q.--. SUPERDEHUMIDIFY `. Press SET TIMEfIEMP button once to flash large display.
This option reqmr& `p&or selection of variable-speed (ICM) Use up or down buttons to alternate between OF and ON on
blower (Option 5). When selected, this option operates blower at large display. Factory default is OF.
further reduced airflow from that of normal dehumidification when
there is a dehumidification demand without a cooling demand, Press SET TIME/TEMP button again to flash upper small
achieving maximum humidity removal with minimum cooling. It display for selection of another option, or press END to exit
is done by supplying blower with a Y signal and no G signal on a configuration mode.
OPTION IO-DUAL FUEL EQUIPMENT efficiency of the furnace and heat pump. For the most economical
operation, the heat pump should operate above this temperature
CAUTION: All dual fuel installations must be equipped (assuming it has sufficient capacity), and the furnace should
a with a high pressure switch to turn off compressor under operate below this temperature.
a high indoor coil pressure condition. 3. Comfort Balance Temperature:
When the heat pump is operating below this point, the indoor
The high pressure switch protects compressor and indoor coil from supply air feels uncomfortable (i.e. too cool). This is purely
subjective and will depend on the homeowner's idea of comfort.
overpressure which would occur if a failure or wiring error
resulted in the heat pump and furnace operating at the same time. Below this temperature, the gas furnace should operate in order to
High Pressure Switch Kit includes required switch and instructions satisfy the desire of indoor comfort.
for proper operation. For all dual fuel installations, outdoor TO SELECT:
temperature sensor must be attached. If not, E3 error message will 1. Enter configuration mode if not already there. See Step 4
appear. See "Error Codes." "To Enter Configuration Mode." Use up and down buttons
This option requires prior selection of heat pump (DIP switch to make small (now flashing) display indicate 11.
l-ON), and must be selected in dual fuel installations. It prevents 2. Press SET TIME/TEMP button once to flash large display.
simultaneous operation of both furnace and heat pump, and 3. Use up or down buttons to move between OF, 5, 10, 15,20,
prevents direct transition from heat pump to furnace operation. 25, 30, 35, 40, 45, 50, or 55 on large display. Factory
When system is dual fuel (heat pump and furnace), set to ON. default is OF.
When system contains fan coil, set to OF. Factory default is OF
4. Press SET TIME/TEMP button again to flash upper small
(off). display for selection of another option, or press END to exit
TO SELECT: configuration mode.
Enter configuration mode if not already there. See Step 4 OPTION 12-DEFROST HEAT SELECT
"To Enter Configuration Mode." Use up and down buttons This option allows installer to select the amount of heat provided
to make small (now flashing) display indicate 10. by Thermidistat Control during a heat pump defrost cycle. This can
Press SET TIME/TEMP button once to flash large display. be very helpful in maintaining a comfortable leaving air tempera-
ture during defrost. The Thermidistat Control senses when defrost
Use up or down buttons to alternate between OF and ON on is in progress by monitoring voltage placed on the 0 line by the
large display. Factory -default is OF.
heat pump while defrosting. It responds by turning on selected
Press SET TIME/TEMP button again to flash upper small combination of Wl and W2 during defrost. Note that this is very
display for selection of another option, or press END to exit different from the operation of an ordinary thermostat, which
configuration mode. cannot sensedefrost in progress and only turns on its W outputs in
response to a temperature demand. Combinations of Wl and W2
OPTION 1l-BALANCE POINT SElTING are selected via the following:
This option is for dual fuel installations only. It requires prior
TABLE l-WI / W2 OUTPUTS
selection of heat pump (DIP switch 1 -- ON) and dual fuel
equipment (Option 10 -- ON). It allows selection of an outdoor SELECTION DEFINITION
temperature of 5°F. through 55°F. (or equivalent values in C.), or Neither Wl or W2 is turned on.
0 This is factotv default.
OF (off). Heat pump is prevented from operating for outdoor
temperatures below selected temperature. If OF (off) is selected, 1 Only Wl is turned on.
heat pump operation is allowed at all outdoor temperatures. 2 Both Wl and W2 turned on.
Factory default is OF (off). This setting can only be equal to or 3
Only W2 turned on (available
below the setting choice made for Option 8. Moving the setting onlv if 3-staae heat is selected).
higher may `push' Option 8 setting upward.
If the outdoor temperature is above the "balance point setting", the The selection procedure is given below. If 0 is selected, operation
heat pump will energize first to try to satisfy the indoor tempera- is like that of an ordinary thermostat, and a wire is required
ture demand. If the heat pump does not make a sufficient between W2 of outdoor unit and a selected W on indoor unit.
improvement within a reasonable time period (i.e. 15 minutes), When selection 1, 2, or 3 is made, no wire should be connected
then the gas furnace will come on to satisfy the indoor temperature from outdoor W2 because this connection may override selection
demand. If the outdoor temperature is below the "balance point made. Obviously the heater must be in 2 sections, and fan coil
setting" the heat pump will not be allowed to operate (i.e. locked jumper must be removed between Wl and W2 for there to be a
out), and the gas furnace will be used to satisfy the indoor difference between selections 1, 2, and 3. For most heaters, Wl is
temperature. lower wattage heater, and W2 is higher, although some have equal
There are three separateconcepts which are related to selecting the elements for W 1 and W2. Consult fan coil/heater combination for
final "balance point setting". Read each of the following carefully the actual wattage connected to each of Wl and W2.
to determine the best "balance point setting" in a dual fuel In dual fuel applications, above selection choices apply and can be
installation: used to select low or high heat if furnace is 2 stage. Wl will
produce low heat. Wl and W2 together produce high heat. This
1. Capacity Balance Temperature:
option provides no value with single-stage furnaces because only
This is the point where the heat pump cannot provide sufficient 1 value of heat is available.
capacity to keep up with the indoor temperature demand because The selection choices guarantee selected outputs will be on during
of declining outdoor temperature. At or below this point, the defrost. If room temperature demand requires additional heat, it
furnace is needed to maintain proper indoor temperature. will be supplied, resulting in additional outputs being turned on. If
2. Economic Balance Temperature: room overheats, specified outputs will not turn off, guaranteeing a
Above this point, the heat pump is the most cost efficient to sufficiently warm leaving air temperature during defrost. Tempera-
operate, and below this point, the furnace is the most cost efficient ture overshoot during defrost can occur, but is almost never
to operate. This can be somewhat complicated to determine and it noticeable because of the short duration of the defrost cycle (4
involves knowing the cost of gas and electricity, as well as the minutes typical, 10 minutes maximum).
-5-
An additional feature of Thermidistat Control defrost is that it 2. Press SET TIME/`TEMP button once to flash large display.
always allows defrost cycle to run to completion. The Thermidistat
3. Use up or down buttons to move between 0, 1, 2, 3,4, 5, or
Control leaves the Y output on as long as outdoor unit holds
6 on large display. Factory default is 2.
voltage on the 0 line, even if it is satisfied. This prevents
premature termination of defrost cycles, which occur with normal 4. Press SET TIME/TEMP button again to flash upper small
thermostats. display for selection of another option, or press END to exit
TO SELECT: configuration mode.
1. Enter configuration mode if not already there. See Step 4 OPTION 15-ENABLE AUTO MODE
"To Enter Configuration Mode." Use up and down buttons This option allows the installer to enable or disable AUTO mode
to make small (now flashing) display indicate 12. (automatic changeover between heat and cool). When disabled,
2. Press SET TIME/TEMP button once to flash large display. AUTO icon does not appear when successive presses of MODE
button are used to move between OFF, HEAT, COOL, and
3. Use up or down buttons to move between 0, 1, 2, or 3 (if
EHEAT (in heat pump systems). Factory default is ON (AUTO
available) on large display. See Table 1 for effect of these
enabled).
choices. Factory default is 0.
TO SELECT:
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit 1. Enter configuration mode if not already there. See Step 4
configuration mode. "To Enter Configuration Mode." Use up and down buttons
OPTION 13-ROOM TEMPERATURE OFFSET ADJUST to make small (now flashing) display indicate 15.
This option allows calibration (or deliberate miscalibration) of 2. Press SET TIME/TEMP button once to flash large display.
room temperature sensor. There are various reasons why home- 3. Use up and down buttons to move between OF and ON on
owners may want to have displayed temperature adjusted to a large display. Factory default is ON (AUTO enabled).
higher or lower value. The selected number is number of degrees
fahrenheit, plus or minus, which will be added to actual tempera- 4. Press SET TIME/TEMP button again to flash upper small
ture. The numbers can range between -5 and +5. Factory default is display for selection of another option, or press END to exit
0. This adjusted value will be used as actual temperature for both configuration mode.
display and control action. For example, if 2 is selected, 72°F OPTION 16-ENABLE PERFECT HEAT PLUS MODE
actual will read 74°F. If set point is 72"F, the room will control to
+ This option requires prior ON selection of heat pump (DIP switch
an actual temperature of 70°F which will be displayed and acted
No. 1) and Configuration Option No. 5 (Select Variable-Speed
upon as if it were 72°F. The effect is that a positive number
Blower). Perfect Heat Plus mode, is part of the Perfect Heat Pump
selection will make the room temperature lower and vice versa.
system, which comprises a selected combination of Thermidistat
The Thermidistat Control is calibrated within an accuracy of plus
Control, Variable Speed Fan Coil, and 3-stage electric heater to
or minus 1°F when shipped from the factory, so this adjustment
provide superior heat pump leaving air temperatures under all
will provide-the best accuracy when set to 0.
conditions. This option selection modifies heat pump blower and
TO SELECT: auxiliary heat operation to contribute to comfortable leaving air
1. Enter configuration mode if not already there. See Step 4 temperature. Specifically, this selection provides:
"To Enter Configuration Mode." Use up and down buttons l Reduced heat pump airflow for outdoor temperatures between
to make small (now flashing) display indicate 13. 12" and 40°F.
2. Press SET TIME/TEMP button once to flash large display. l At least 1 stage of electric heat ON for all heating below 12OF.
3. Use up or down buttons to move between -5, -4, -3, -2, -1, + While outdoor air temperature is between 12 and 40"F, the
0, 1, 2, 3, 4, or 5 on large display. Factory default is 0. Thermidistat Control removes the G signal during heat pump
4. Press SET TIME/TEMP button again to flash upper small heating. The FK4C and FV4A Variable-Speed Fan Coils respond
display for selection of another option, or press END to exit by reducing their airflow in the absence of the G signal, raising
configuration mode. leaving air temperature. For any heating demand below 12"F, G
and W/W1 are turned ON, assuring at the least 1 stage of electric
OPTION 14-HEAT/COOL DEAD BAND ADJUSTMENT
heat is on, and also increasing leaving air temperature.
This option selects the minimum difference between heat and cool As part of the Perfect Heat pump system, Configuration Option
set points. A larger difference saves energy and a smaller differ- No. 9 (Intelligent Heat Staging) should also be set to ON if the heat
ence decreases temperature difference between heating and cool- pump is single stage and a 3-stage heater is present.
ing. Factory default is 2, which means cooling set point must be a TO SELECT:
minimum of 2" above heating set point. An attempt to move them
closer will result in one "pushing" the other to maintain the 1. Enter configuration mode if not already there. See Step 4
required difference. "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
result in regular cycling between heat and cool when AUTO mode 2. Press SET TIME/TEMP button once to flash large display.
is selected. However, this cycling cannot occur more often than 1 3. Use up and down buttons to move between OF and ON on
transition every 20 minutes. The system has a built-in requirement large display. Factory default is OF.
that it cannot switch between heat and cool without a 20 minute
"off" time between the 2 operations. Specifically, to switch from 1 4. Press SET TIME/TEMP button again to flash upper small
mode to the other, there must be no demand for the old mode and display for selection of another option, or press END to exit
a demand for the new mode, and this must exist continually for 20 configuration mode.
minutes before transition to the new mode will occur. OPTION 17-ENABLE NON-PROGRAMMABLE
TO SELECT: OPERATION
1. Enter configuration mode if not already there. See Step 4 This option converts the programmable Thermidistat Control to a
"To enter Configuration Mode." Use up and down buttons non-programmable control for those users who do not want
to make small (now flashing) display indicate 14. programmability. The clock is retained, but the days of the week
PROGRAMMABLE CONFIGURATION NON-PROGRAMMABLE CONFIGURATION
(OPTION 17 OFF) (OPTION 17 ON)
A99059
Fig. 2-Programmable/Non-Programmable Keypad Labels
and the daily schedules have been eliminated, making it operate as Redefinition of Buttons
if HOLD were permanently ON. Some of the buttons (used in Fig. 2 shows the original (programmable) button labels on the left
programming only and now not needed) are redefined to simplify and the redefined (non-programmable) buttons on the right. In the
the non-programmable operation. To match these redefined but- figure, the buttons are numbered for easy reference. They are not
tons, a new keypad label, included with the Thermidistat, must be numbered on the actual product. Six of the buttons (numbers 1
placed over the original keypad label. Fig. 2 shows both the through 5 and 9) have been redefined.
original keypad label and the non-programmable keypad label. Button 3 originally alternated between time, cool set point, and
When this option is selected, the new keypad label must be applied heat set point with each press. Now, button 1 selects the cool set
over (or in place of) the original. Because these adhesive-backed point, button 2 selects the heat set point, and button 3 selects time,
keypad labels are not designed to be removed, this conversion now used only to set the clock. Note that the days of the week are
should be considered permanent. Once the change to non- gone.
programmable operation is done, a procedure is not provided to
Button 5 used to alternate between humidify and dehumidify. Now
easily change it back. Should this change be needed, it is best to
button 4 selects dehumidify and button 5 selects humidify.
trade the Thermidistat for one which has not been converted.
Button 9 now loses the HOLD label, making it END only. This
Both programmable and non-programmable versions of the Ho-
button is only used to END the humidity screen and the configu-
meowner's Manual are available. Be sure to leave only the correct
ration mode.
version of the Homeowner's Manual with the homeowner.
These changes both simplify operation for the homeowner and find
Once it has been determined that a particular installation is to be use for the buttons which are no longer needed when programma-
made non-programmable, the only changes required are: bility is removed.
l Attach non-programmable keypad label over original program- V. SYSTEM START-UP AND CHECKOUT
mable one.
The Therm&tat Control is designed with a built-in installer test
l Attach non-programmable start up instructions sticker to back capability. It allows easy operation of equipment without delays or
of door. set point adjustments to force heating or cooling.
l Set Configuration Option No. 17 to ON. To enable installer test mode, move DIP switch No. 4 to ON
l Leave non-programmable homeowner's manual with home- position. To access this switch, open case as described in Step 2.
owner. Use the comer of a small screwdriver to slide switch No. 4 to ON
To attach the provided non-programmable keypad label, carefully position.
peel off its backing and apply it over the original keypad label. While in installer setup mode, clock will display "InSt," FAN
PLEASE HEED: Once the new keypad label makes contact, it will button will control fan, and MODE button will control heating and
stick firmly in place and adjustments cannot be made. CARE- cooling.
FULLY locate an edge of the keypad label, making sure its A. To Test Fan:
position and orientation are correct. Then, from the attached edge, Fan button switches FAN icon between AUTO and ON. While ON
smooth the rest of the keypad label over the original. Make sure the is displayed, G output will be on, turning fan on. Allow up to 10
new keypad label does not interfere with the motion of the buttons set after button is pressed for fan to turn on and off. On some fan
which it surrounds. coils, fan continues to operate for 90 set after G signal is removed.
TO SELECT: B. To Test Cooling and Dehumidification:
1. Enter configuration mode if not already there. See Step 4 Press MODE button until COOL icon turns on. Cooling begins
"To Enter Configuration Mode." Use up and down buttons within 10 set and remains on for 4 minutes. If system is 2-speed,
to make small (now flashing) display indicate 17. low speed comes on for first 2 minutes, followed by high speed for
2. Press SET TIME/TEMP button once to flash large display. second 2 minutes. At the end of 4minute run, cooling stops, and
MODE reverts back to OFF. At any time during 4minute run time,
3. Use up and down buttons to move between OF and ON on cooling may be turned off by pressing MODE button until OFF
large display. Factory default is OF. appears. While cooling is on, successive presses of HUMIDITY
4. Press SET TlME/TEMP button again to flash upper small button turn dehumidify output on and off. While this output is
display for selection of another option, or press END to exit active, "dh" appears in cool set point display. Equipment outputs
configuration mode. for different equipment types are listed in Table 2.
-7-
TABLE 2-EQUIPMENT OUTPUTS
l-SPEED AC 2-SPEED AC l-SPEED HP 2-SPEED HP
Cool-O to 2 minutes Y, G Yl, G Y, G, 0 Yl, G, 0
Cool-2 to 4 minutes Y, G Yl, Y2, G `f, G, 0 Yl, Y2, G, 0
Heat-O to 2 minutes Wl WI Y, G Yl, G
Heat-2 to 4 minutes Wl, w2 Wl, v\-17 I
VG -
., Yl, Y2, G
Eheat-0 to 2 minutes --_ ___ Wl Wl
I I
Eheat-2 to 4 minutes ___ _-- Wl, w2t w1*
t
* Two-stage heat not available
NOTE: For Y-use terminal YiY2, for Yl-use terminal YlNv2, for W2-use terminal ONv2,
for O-use terminal O/W2, for Wl-use terminal WNvl. for W2t, use terminal YlNv2
C. To Test Primary Heating and Humidification: A. Perfect Humidity Humidification
Press MODE button until HEAT icon turns on. Primary heating The Thermidistat Control directly connects to a standard 24-vat
begins within 10 set and remains on for 4 minutes. This will be humidifier to control humidification in the home. A humidify set
furnace or electric heat in AC system and heat pump heating in point between 10 and 45 percent relative humidity is selected by
heat pump system. If system has 2 stages of primary heat, first the homeowner, or all humidification can be turned off. When
stage will be on for 2 minutes followed by second stage for 2 humidity in home drops below set point, humidifier will be turned
minutes. At the end of 4-minute run, heating stops, and MODE on to raise humidity level. Humidification can only occur in
reverts back to OFF. At any time during 4-minute run time, heating heating mode (HEAT or AUTO/HEAT). Five different humidifi-
may be turned off by pressing MODE button until OFF appears. cation selections are available and are described below.
While heating is on, successive presses of HUMIDITY button turn Normal Humidify
humidify output on and off. While this output is active, "hu"
appears in heat set point display. Equipment outputs for different In normal humidify, humidifier will be on if there is a
equipment types are listed in Table 2. humidity demand and any heating equipment is on. This
will include furnace, heat pump, or auxiliary heat. In heat
D. To Test Auxiliary Heating: pump applications, this is an improvement over using an
Auxiliary heating only exists in heat pump systems. To test, press external humidistat, which only supplies humidity when
MODE button until EHEAT icon turns on. This will be electric auxiliary heat is on.
heat in standard heat pump systems and furnace in dual fuel
Fan Humidify
systems. Auxiliary heating begins within 10 set and remains on for
4 minutes. If there are 2 stages of auxiliary heat, first stage comes This configuration allows a humidify demand to turn on fan
on for 2 minutes followed by second stage for 2 minutes. At the and humidifier together, even if there is no heat demand. It
end of 4-minute run, heating stops and MODE reverts back to