CARRIER Controls And HVAC Accessories Manual L0606346

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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Installation, Start-Up,
and
Operating Instructions
NOTE: Read
installation.
This symbol

the entire

instruction

--->indicates

a change

manual

before

starting

the

Page

SAFETY

CONSIDERATIONS

INTRODUCTION

........................

CONSIDERATIONS

INSTALLATION

...................................

HUMIDITY

CONTROL

OPERATIONAL

TROUBLESHOOTING

WIRING

RECORD

DIAGRAM

....

field-configured

1
2

...................

....................

.............................

CONFIGURATION

also

1
.................

FEATURES

INFORMATION

can

..................................

INSTALLATION

Control

non-programmable
thermostat.
When
operating
in the
non-programmable
configuration
it will still have both
temperature
and humidity control. Humidify and dehumidify

since the last issue.

INDEX

Thermidistat

........................

See Thermidistat

_" Wiring

Diagrams

SAFETY CONSIDERATIONS

\
A98426

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

Recognize

safety

z_.

you

Thermidistat

Height (In.)

Width (In.)

Depth (In.)

4- 3/8

7 - 3/8

1- 3/8

Control.
Fig. 1 - Carrier

When

instruction

information.

This

see this symbol

manual,

is the safety-alert

on the equipment

be alert to the potential

for personal

and in the
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
which

personal injury or death. WARNING
signifies a hazard
could result in personal injury or death. CAUTION
is

used to identify unsafe practices which would result in minor
personal injury or product and property damage. NOTE is used
to highlight
suggestions
which
will result
in enhanced
installation,

reliability,

or operation.

INTRODUCTION
Carrier's

7-day

Thermidistat _"
which combines

programmable

Control is a wall-mounted,
temperature
and humidity

Programmable

Thermostat

Control

symbol

non-programmable
low-voltage
control
control in a single

attractive
unit. An extension
of Carrier's
proven
line of
thermostats,
it provides
separate
set points for heating
and
cooling,
and now adds humidification
and dehumidification.
Different
heating
and cooling
set points
and times
programmable
for 4 periods per day and 7 days per week.

are
The

outputs
During

provide direct control of humidity.
power loss an internal
memory

settings for unlimited
least 8 hr.

Batteries are not used.
stores programs
and

time, and the clock continues

INSTALLATION

to run for at

CONSIDERATIONS

POWER
Note that this control does not require batteries and is not "power
stealing." It does require 24vac (R and (7 terminals) of the
low-voltage
transformer
to be connected to it for proper
operation. It will not operate without these 2 connections.
MODELS
There is a single programmable/non-programmable
model for all
applications. It can be configured for AC or HP, 1-or 2-stage
compressor, and for Hybrid Heat" installations, allowing it to be
used in place of all Carrier thermostats.
HUMIDIFY EQUIPMENT AND CONNECTIONS
The humidify output connects directly to 24vac operated
humidifiers. No other connection or interlock is required. Any of
several installer-selectable operating modes are available.

DEHUMIDIFY
EQUIPMENT
ANDCONNECTIONS
Thedehumidify
outputconnects
tothedehumidify
inputon
variable-speed
furnacesand fan coils. Additional
dehumidification
isdone
bycontrolling
thecompressor.
Avariety
ofoperating
modes
areavailable.

SWITCH

Use this switch

OPERATION

Failure to follow
injury or death.

this warning

could

result

OFF--for
ON--for

This

in personal

air conditioner

and heat pump

air conditioner
installations. This is factory default.
heat pump installations,
using either a fan coil
(Hybrid
2--1

switch

Heat).
SPEED/2

tells

SPEED

the system

whether

the compressor

is 1 or 2

stage.
TO SET

DO NOT connect furnace HUM terminal
directly to
Thermidistat
HUM terminal. This will bypass furnace
safety controls. See Low Voltage Wiring Diagrams and
notes for proper connection.
OUTDOOR

to select between

TO SET

SWITCH

HAZARD

SELECT

systems.

furnace
ELECTRICAL

1--AC/HP

TEMPERATURE

OFF--for

single-speed

compressors,

This is factory

2-speed

SWITCH

3--SMART/CONVENTIONAL

Selects

SENSOR

compressor.

ON--for

between

whether

conventional

default.

AC or HP.
RECOVERY

and smart

recovery

from

setback.

Optimum performance
is obtained when an outdoor temperature
sensor is used with the Thermidistat
Control. Plan installation
so

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

that 2 wires can be run from Thermidistat

will arrive at programmed

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.
outdoor
unit and existing
control
connection.

Details

are provided

Sensor
can be mounted
to
wires may be used for its

in sensor

instructions.

• Approximately

Control

5 ft (1.5m)

• Close to or in a frequently
partitioning

Thermidistat

Location

from floor.
used room, preferably

Control

should

• Close to a window,

on an inside

smart recovery. This is factory
conventional
recovery.

SWITCH

4--INSTALLER

other temperature-radiating

objects which

could cause a false

reading.
• Close to or in direct airflow from supply

registers

OFF--for
ON--for

ELECTRICAL

such as behind

Before installing Thermidistat
to equipment.
There
may
disconnect.

a door or in an

2. If an existing

DIP Switches
within

tire Thermidistat

Control

2. Remove

by snapping

cover completely

Thermidistat

Control

halves will swing
4. Snap hinge

it apart

5. Switches are located
To change
switch
screwdriver

back half

of the

halves.

have

been

to opposite
set. do

not

position.
reassemble

The rear plastic will first be mounted

NOTE:

the 2

to the wall.

from wall.

wires from existing

Mercury

thermostat.
record

1 at a time.

wire color and

marking.
wire may be needed

to accommodate

outputs.

or recycle old thermostat.
is a hazardous

waste

and MUST

be disposed

properly.
3. Hold the Thermidistat
separated
from the
Control,

the 2 halves.

in upper right corner of circuit board.
position,
use corner
of a small

to slide switch

switches

separate

e. Discard

at hinge.

apart.

apart to completely

terminal

cover.

by pressing

in personal

is being replaced

thermostat

added humidity

right end of plastic case inward while, at the same time,
pulling front and back halves apart at the right end. The 2

6. After

thermostat

d. New or additional

steps.

1. Open hinged Thermidistat

result

Control. turn off all power
be more than 1 power

c. As each wire is disconnected,

which must be properly set by the installer. It is easiest to set these
4 switches before the Thermidistat
Control is mounted
to the
the following

could

to equipment.

existing

b. Disconnect

DIP switch

HAZARD

this warning

a. Remove

wall, so STOP and complete

default.

Control

OPERATION

Failure to follow
injury or death.

alcove.

is a 4 section

This is factory

Thermidistat

1. Turn off all power

• In areas with poor air circulation,

3. Open

normal operation.
installer test mode.

and return-air

registers.

There

OFF/ON

NOT be mounted

on an outside wall, or next to a door leading

to direct light or heat from a lamp, sun, fireplace,

Step 2--Set

TEST

default.

pipes or duct work.

to the outside.
• Exposed

OFF--for
ON--for

Step 3--Install

of wall without

time.

TO SET

wall.

• On a section

at programmed

Selects a special installer test mode which assists with system
startup and checkout. See Step 5, System Startup and Check-out.

INSTALLATION
Step 1-- Thermidistat

temperature

TO SET

4. Route

Control
remainder

rear plastic. (If it is not
of the Thermidistat _'_

refer to Step 2 above.)
wires through

large hole in rear plastic.

Level

rear

plastic against wall (for aesthetic value only--Thermidistat
Control
need not be leveled for proper operation)
and
mark wall through 2 mounting holes.
5. Drill two 3/16-in.
6. Secure
provided.

mounting

rear plastic
Additional

to wall

holes in wall where marked.
with

mounting

2 screws
holes

are

and anchors
available

for

moresecure
mounting
if needed.
Makesureallwires
extend
through
holeinmounting
base.
7.Adjustlength
androuting
ofeach
wireto reach
proper
connector
blockandterminal
onrearplastic
with1/4-in.
extralength.
Striponly1/4in. ofinsulation
fromeach
wireto prevent
adjacent
wiresfromshorting
together
when
connected.
8.Match
andconnect
equipment
wirestoproper
terminals
of
each
connector
block.
(See
LowVoltage
WiringDiagram
Reference
Chart
andFigs.1through
28inseparate
Wiring
Diagram
literature).
Remember
R andC mustbe
connected
for properoperation.
Improper
wiringor
installation
maydamage
Thermidistat
Control.
Check
to
makesurewiringis correct
beforeproceeding
with
installation
orturning
onpower.

CONFIGURATION

OPTIONS

Configuration
be selected
homeowner.

options,

like DIP switch

settings,

are intended

at installation
and normally
are not modified by the
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.
Description
of each
mode follows.

selection

and how to use the configuration

SUMMARY

1--Anticipator
adjustment
2--Clean
filter timer adjustment

Option

3--English/Metric

Option
Option
Option

4--Fan (G) ON with W selection
5--Variable-speed
blower present selection
6--Cooling
lockout below 55 ° selection

Option

7--Variable-speed

selection

super dehumidification

available when variable-speed
blower is used)
Option
8--Auxiliary
heat lockout
temperature
available when heat pump is used)
Option
9--Intelligent
Heat Staging
selection
when single-stage

heat pump

Option
10--Hybrid
pump is used)
Option 11--Balance

pump is used)
Option 13--Room

selection

point

setting

heat

selection

temperature

(only

setting

(only

available
available

(only

available
when

when

available

heat

Hybrid

when

heat

offset adjustment

Option
Option

14--Heat/cool
dead band adjustment
15--Enable
Auto mode

Option
Option

16--Enables
Super Comfort Heat Mode
17--Non-Programmable
selection

TO ENTER

selection

is used)

Heat

Heat is selected)
Option
12--Defrost

UNITDAMAGE
HAZARD
Failure
tofollowthiscaution
mayresult
inequipment
damage
orimproper
operation.
Improperwiring or installation
may damage
Thermidistat
Control.
Check
tomake
surewiringis
correct
before
proceeding
withinstallation
orturning
onpower.
9.Push
anyexcess
wireintowallandagainst
rearplastic.
Sealholein walltoprevent
airleaks.
Leaks
canaffect
operation.
10.Reattach
Thermidistat
Control
bodytorearplastic
byfirst
reattaching
hinge.
11.Close
Thermidistat
Control
assembly,
making
sure
pinson
back
ofcircuit
board
align
withsockets
inconnector.
12.Turnonpower
toequipment.
Onpower
up,alldisplay
segments
willlightfor5 sec.Forthe
next5 seca 2-digitcodeappears
onlargedisplaywhich
identifies
Thermidistat
Control
configuration.
1.AC--forl-stage
airconditioner
2.HP--forl-stage
heat
pump
3.A2--for2-stage
airconditioner
4.H2--for2-stage
heat
pump
5.dF--forl-stage
Hybrid
Heat
6.d2--for2-stage
Hybrid
Heat
7.HS--for1-stage
heat
pump
withIntelligent
Heat
Staging
(3-stage
auxiliary
heat
with40FK,
FK4C,
orFV4A
Series
fancoils.)
When
thisidentifier
disappears,
normal
operation
begins.
The
MODE
control
should
besettoOFFandFANcontrol
toAUTO,
soequipment
doesnotstartuntilfurtherconfiguration
and
checkout
iscompleted.
Step4--Set Thermidistat ('ontrol ('onflguration

Option
Option

CONFIGURATION

MODE

Press and hold FAN button for approximately
10 sec until COOL
set point display
indicates
a flashing
1. The Thermidistat
Control is now in configuration
mode. It will automatically
exit
this mode if no button is pressed for 3 minutes.
button will exit configuration
mode immediately.
WHILE

IN CONFIGURATION

Pressing

END

MODE

The upper small (COOL set point) display
indicates
selected
option number and large display indicates selection made within
that option. One of these will be flashing.
The up and down
buttons are used both to move between available options and to
make selection
for each option. When option number
(small
display)
is flashing,
up and down buttons
adjust it, moving
between
available option numbers. After desired option number
has been selected, press SET TIME/TEMP
button once. The large
display will now flash, indicating that up and down buttons now
control
available
choices
within
that
TIME/TEMP
button switches between
display)
display).

and

available

CONFIGURATION
Option

OPTIONS

1--Anticipator

This adjustment
Control. Higher

selections

option.
Each press of
available
option (small

within

each

option

(large

--SELECTION

Adjustment

controls sensitivity and cycle rate of Thermidistat
numbers decrease sensitivity and slow cycle rate.

Lower numbers increase sensitivity
and cycle rate. However,
a
limiting
feature
'sTill not allow more than 4 cycles
per hr,
regardless
of setting. Anticipator
values can range from 1 to 9.
Factory default is 3. This default selection provides
optimum
performance
in nearly all installations.
Try it first. Do not change
setting
unless
there is evidence
of need to do so. Unlike
conventional
anticipators,
this setting is not determined by current
draw. There is no need to measure,
know, or compensate
for
current draw. There is also
Control. Regardless of setting
and cooling

will control

no droop with this Thermidistat
and number of stages, both heating

to their respective

set points.

TO ADJUST
1. Enter configuration

mode

"To Enter Configuration

if not already
Mode."

there.

The upper

set point) display will be flashing
down buttons to move it to 1.

See Step 4

small (COOL

1. If not, use up and

2.Press
SETTIME/TEMP
buttononceto flashcurrent
selection
of1.2.3,4,5,6,7,8,or9 onlarge
display.
Factory
default
is3.
3.Useup anddownbuttons
to movebetween
available
choices.
4.Press
SETTIME/TEMP
button
again
toflashupper
small
display
forselection
ofanother
option,
orpress
ENDto
exitconfiguration
mode.
Option

2--Clean

Option
If furnace

numbers

1 through

1. Enter configuration
"To

2. Press

SET

if not already there.
Mode."
Use up

TIME/TEMP

button

display
once

and down

buttons

to move

button

See Step 4
and down
indicate

flash

TO SELECT

Fahrenheit

exit configuration

"To

or press

Enter

buttons

SET

Mode."

TIME/TEMP

button

of F or C. Factory

3. Use up and down
large display.

buttons

4. Press SET TIME_EMP

to move

button

4--Fan

(G) On With
determines

there.

Use

display
once

default

display fnr selection of another
exit configuration
mode.

This selection

Lockout

See Step 4
and

down

indicate

flash

Enter

mode

Configuration

between

F and C on

again to flash upper
option,

and

down

indicate

once to flash large display.

when

outdoor

temperature

is below

temperature
sensor. Set to OF (off) to
Set to ON to prevent cooling below

if not already there.
Mode."
Use up

to make small (now flashing)
button

display

See Step 4
and down
indicate

once to flash large display.

or press

small

END

there

demand,
cooling.

mode.

Variable-Speed
requires

Superdehumidify

prior

selection

of variable-speed

(ICM)

5). When selected, this option operates blower
airflow from that of normal dehumidification

is a dehumidification

demand

without

a cooling

achieving maximum
humidity
removal with minimum
It is done by supplying blower with a Y signal and no G

signal on a call for cooling. Not all products with
have this feature. Check Installation
Instructions
handler
supplied

used. Select
on a cooling

ICM blowers
for ICM air

OF (off) for normal operation
(Y and
call). Select ON for super dehumidification

(Y with no G on a dehumidify

only call). Factory

default

is OF

(off).
TO SELECT

fan (G) output

1. Enter configuration

is to be ON or

Mode."

button

Use

there.
up

display

button

3. Use up or down buttons

to alternate

down
4.

once to flash large display.

Factory

there.

See Step 4

Use up and down
display indicate 7.

once to flash large display.
between

default

OF (off) and

is OF (off).

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to
exit configuration
mode.

See Step 4
and

if not already

2. Press SET TIME/TEMP

ON on large display.

indicate

mode

"To Enter
Configuration
Mode."
buttons to make small (now flashing)

is OF (oft').

if not already

to make small (now flashing)

2. Press SET TIME/TEMP

display

default is OF (off).

(Option
reduced

when

current

option

blower
further

TO SELECT
1. Enter configuration

See Step 4

Below 55 °F

cooling

exit configuration

default

whether

there.

Use

3. Use up or down buttons to alternate between OF (off) and
ON on large display. Factory default is OF (off).

is F.

blower. In this case, select ON. Factory default

buttons

disables

buttons

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

"To

button

1. Enter configuration
mode
"To Enter
Configuration

This

to make small (now flashing)

selection

Mode."

TO SELECT

small

END

Factory

if not already

Configuration

if not already

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to

and Celsius operation.

mode

is OF (off).

mode.

55 °F. It requires an outdoor
allow cooling below 55°F.

available

OR ADJUST

2. Press

6--Cooling

Option

1. Enter configuration

set

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to

3--English/Metric

Select between
is Fahrenheit.

Option

between

option,

default

to make small (now flashing)

55 °F. Factory

current

again to flash upper

display for selection of another
exit configuration
mode.
Option

mode

Configuration

2. Press SET TIME/TEMP

4. Press SET TIME/TEMP

blower,

3. Use up or down buttons to alternate between OF (off) and
ON on large display. Factory default is OF (off).

selection of OF (off), 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large
display. Factory default is 2.
3. Use up
choices.

Enter

This option

to make small (now flashing)

(ICM)

(PSC) blowers,
set to OF (off).
to use special features available

2. Press SET TIME/TEMP

Option

OR ADJUST

buttons

a variable-speed

9. (Time is

operation.

1. Enter configuration
mode
"To Enter
Configuration

Blower

only in units with an ICM blower. Factory

400 X number
selected.)
Factory
default
is 2 (800 hr).
Recommended
selections are disposable
filter--400
to 800 hr,
media filter--1200
to 1600 hr, or electronic air cleaner--1600
to
2400 hr of blower

or fan coil contains

buttons

hr by selecting

(ICM)

TO SELECT

Filter Timer

from 400 to 3600

Variable-Speed

this option to ON. For normal
This selection enables system

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

TO SELECT

Option
This

8---Auxiliary

option

requires

Heat Lockout

Setting

prior selection

of heat

(DIP

switch

1--ON).
through

4. Press SET TIME_EMP
button again to flash upper small
display for selection of another option, or press END to

heat (furnace
in Hybrid Heat applications)
is prevented
from
operating for outdoor temperatures
above selected temperature.
If

exit configuration

mode.

It allows selection
55W (or equivalent

pump

3. Use up or down buttons to alternate between OF (oft') and
ON on large display. Factory default is OF (oft').

OF (oft`) is selected,
operation
is allowed
emergency

of an outdoor temperature of 5°F
values in C), or OF (off). Auxiliary

auxiliary
heat
at all outdoor

heat (EHEAT)

overrides

(furnace
if Hybrid Heat)
temperatures.
If selected,
this feature.

Factory

default

isOF(off).Thissetting
canonlybeequal
toorabove
thesetting
choice
made
forOption
11.Moving
thissetting
lowermaypush
Option
11setting
downward.
TOSELECT
1.Enter
configuration
mode
if notalready
there.
See
Step4
"ToEnterConfiguration
Mode."Useup anddown
buttons
tomake
small
(nowflashing)
display
indicate
8.
2.Press
SETTIME/TEMP
button
once
toflash
large
display.
3.Useupordownbuttons
tomove
between
OF(off),5,10,
15,20,25,30,35,40,45,50, or 55 on large display.
Factory

default is OF (of*).

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to
exit configuration
Option
This

9--Intenigent

option

mode.
Heat

requires

prior

Staging
selection

of single-stage

heat pump

(DIP switch 1 ON, DIP switch 2 OF). It provides
3 stages of
electric heat from Wl and W2 by sequencing
W1 only, then W2
only, then both Wl and W2. See FK or FV Series Fan ('oil
Installation

Instructions

for further

select ON. For normal
default is OF (off).

1-or

information.

2-stage

For 3-stage

heat,

heat, select OF (off). Factory

if not already there.
Mode."
Use up

to make small (now flashing)

2. Press SET TIME/TEMP

button

display

See Step 4
and down
indicate

to alternate

ON on large display.

Factory

4. Press SET TIME/TEMP

once to flash large display.

Option

ll--Balance

button

OF (off) and

is OF (off).

again to flash upper
option,

or press

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to
exit configuration
10--Hybrid

mode.

The high pressure switch protects compressor
and indoor coil
from overpressure
which would occur if a failure or wiring error
resulted in the heat pump
High Pressure
Switch

and furnace operating
at the same time.
Kit includes
required
switch
and

for proper
operation.
outdoor temperature
sensor

E3 error message will
requires prior selection

For all Hybrid
Heat
must be attached. If not,

appear. See "Error Codes."
of heat pump (DIP switch

This option
1 ON), and

must be selected
in Hybrid
Heat installations.
It prevents
simultaneous
operation
of both furnace and heat pump, and
prevents direct transition
from heat pump to furnace operation.
When

system

is Hybrid

When

system

contains

Heat (heat pump

and furnace),

set to ON.

fan coil, set to OF (of*'). Factory default

OF (off).

Heat installations
only. It requires
(DIP switch
1 ON) and Hybrid

prior
Heat

(Option 10 ON). It allows selection of an outdoor
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,
heat pump operation
is allowed
at all outdoor
temperatures.
Factory default is OF (of*'). 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
is below

the "balance

There are three separate concepts
the final "balance
point setting".

point

setting"

the heat pump

CAPACITY

which
Read

the best "balance

BALANCE

and the gas

are related to selecting
each of the following

point setting"

in a Hybrid

TEMPERATURE

This is the point where the heat pump cannot provide sufficient
capacity to keep up with the indoor temperature
demand because
of declining
outdoor temperature.
At or below this point,
furnace is needed to maintain proper indoor temperature.
ECONOMIC

Heat Equipment

small

END

Point Setting

This option is for Hybrid
selection
of heat pump
equipment
temperature

between

default

display for selection of another
exit configuration
mode.

carefully to determine
Heat installation.

once to flash large display.

3. Use up or down buttons to alternate between OF (of*) and
ON on large display. Factory default is OF (of1).

instructions
installations,

3. Use up or down buttons

temperature

1. Enter configuration
mode
"To Enter
Configuration

Option

button

will not be allowed
to operate
(i.e. locked out),
furnace will be used to satisfy the indoor temperature.

TO SELECT

buttons

2. Press SET TIME/TEMP

BALANCE

the

TEMPERATURE

Above this point, the heat pump is the most cost efficient
to
operate, and below this point, the furnace is the most cost efficient
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

(assuming
it has sufficient
capacity),
operate below this temperature.
COMFORT
When

BALANCE

the heat pump

above

this temperature

and the furnace

should

TEMPERATURE
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 comfort.
Below this temperature,
the gas furnace
satisfy the desire of indoor comfort.

should

operate

in order to

there.

See Step 4

TO SELECT
1. Enter configuration
"To
UNIT

DAMAGE

HAZARD

buttons

Failure to follow this caution may result
damage or improper operation.

mode

Configuration

in equipment

if not already
Mode."

to make small (now flashing)

2. Press SET TIME/TEMP

button

tory default

4. Press SET TIME/TEMP

TO SELECT
if not already there.
Mode."
Use up

to make small (now flashing)

display

See Step 4
and down
indicate

display

and

down

indicate

11.

once to flash large display.

is OF (off).
button

display for selection of another
exit configuration
mode.

1. Enter configuration
mode
"To Enter
Configuration

Use

3. Use up or down buttons to move between OF (off), 5, 10.
15.20.
25, 30, 35, 40, 45, 50, or 55 on large display. Fac-

All Hybrid Heat installations
must be equipped with a
high pressure switch to turn off compressor
under a
high indoor coil pressure condition.

buttons

Enter

10.

again to flash upper
option,

or press

small

END

Option

12--Defrost

Heat Select

Option

13--Room

Temperature

Offset Adjust

This option allows installer to select the amount of heat provided
by Thermidistat
Control during a heat pump defrost cycle. This

This option allows
room temperature

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

homeowners
may want to have displayed temperature
adjusted to
a higher or lower value. The selected number
is number
of
degrees Fahrenheit.
plus or minus, which will be added to actual

O line by the heat pump while defrosting.
It responds by turning
on selected combination
of Wl and W2 during defrost. Note that

temperature.
The numbers can range between -5 and +5. Factory
default is 0. This adjusted value will be used as actual temperature

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
Wl and W2 are selected as shown in Table 1.

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

Table
Selection

Wl/W2

Outputs

Definition

Wl nor W2 is turned

on. This is factory

Only W1 is turned

Both W1 and W2 turned

default.

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
of plus or minus I°F

Control is calibrated
when shipped from

adjustment

the best accuracy

on.

1, 2. or 3 is made,

only if 3-stage

buttons

no wire should

be connected

jumper must be removed between Wl and W2 for there to be a
difference between selections 1, 2, and 3. For most heaters. Wl is
wattage heater, and W2 is higher, although
elements
for Wl and W2. Consult
fan

combination
W2.
In Hybrid

for the actual wattage

Heat applications,

connected

above

selection

some have
coil/heater

The

selection

choices

guarantee

selected

during defrost. If room temperature
heat, it will be supplied,
resulting

An additional

feature

typical,

of Thermidistat

always
allows
defrost
cycle
to run
Thermidistat
Control leaves the Y output

outputs

because

will

be on

maxinmm).
defrost

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to
exit configuration
mode.

2. Press SET TIME/TEMP

button

This
occur

Dead Band

Adjustment

This option selects the minimum
difference
between
heat and
cool set points. A larger difference saves energy and a smaller

display

Depending
on set points, moving dead band closer than 2 ° may
result 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
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

continually

for the new mode,

for 20 minutes

before

transition

and this must exist
to the new mode will

Occur.

See Step 4
and down
indicate

1. Enter configuration
mode if not already there. See Step 4
"To enter Configuration
Mode." Use up and down buttons
to make small (nov," flashing)
2. Press SET TIME/TEMP

display

button

indicate

4. Press SET TIME/TEMP
display

12.

once to flash large display.

for selection

exit configuration
Option

15--Enable

This option

button

14.

once to flash large display.

3. Use up or down buttons to move between
or 6 on large display. Factory default is 2.

4. Press SET TIME/TEMP
button again to flash upper small
display for selection of another option, or press END to
mode.

14--Heat/Cool

TO SELECT

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.

exit configuration

Option

is that it

to completion.
The
on as long as outdoor

if not already there.
Mode."
Use up

to make small (now flashing)

-5, -4, -3, -2.

Factory default is 0.

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.

TO SELECT

buttons

between

1, 2, 3, 4, or 5 on large display.

and

apply

unit holds voltage on the O line, even if it is satisfied.
prevents premature
termination
of defrost cycles, which
with normal thermostats.

1. Enter configuration
mode
"To Enter
Configuration

once to flash large display.

choices

furnaces

Control

13.

difference
decreases temperature
difference between
heating and
cooling. Factory default is 2, which means cooling set point must

demand requires additional
in additional
outputs being

10 minutes

to move

indicate

and

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 minutes

button

3. Use up or clown buttons

display

See Step 4
and down

to each of Wl

can be 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 option provides no value with single-stage
only 1 value of heat is available.

to make small (now flashing)

2. Press SET TIME/TEMP

-1.0,

from outdoor W2 because this connection
may override selection
made. Obviously
the heater must be in 2 sections, and fan coil

lower
equal

when set to 0.

1. Enter configuration
mode if not already there.
"To Enter Configuration
Mode."
Use up

on.

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.
selection

will provide

within an accuracy
the factory, so this

TO SELECT

Only W2 turned on (available
heat is selected.

When

calibration
(or deliberate
miscalibration)
of
sensor.
There
are various
reasons
why

0, 1, 2, 3, 4, 5,

again to flash upper

of another

option,

or press

small

END

mode.

Auto

Mode

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
enabled).

systems).

Factory

default

is ON (AUTO

TOSELECT
1.Enter
configuration
mode
if notalready
there.
See
Step4
"ToEnterConfiguration
Mode."Useup anddown
buttons
tomake
small
(nowflashing)
display
indicate
15.
2.Press
SETTIME/TEMP
button
once
toflash
large
display.
3.Useupanddown
buttons
tomove
between
OF(off)and
ONon largedisplay.
Factory
default
is ON(AUTO
enabled).
4.Press
SETTIME/TEMP
button
again
toflashupper
small
display
forselection
ofanother
option,
orpress
ENDto
exitconfiguration
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
Pump system,

Comfort Heat mode is part of the Comfort
which
comprises
a selected
combination

Heat
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
comfortable

blower and auxiliary heat operation
to contribute
to
leaving air temperature.
Specifically,
this selection

provides:

conversion

heat pump

airflow for outdoor

temperatures

between

Both

programmable

Homeowner's
correct version

• At least 1 stage of electric

heat ON for all heating

While outdoor air temperature
Thermidistat
Control
removes
The 40FK.
by reducing

below

12_'F.

is between
12°F and 40"F, the
the G signal during heat pump

FK4C, or FV4A Variable-Speed
Fan Coils
their airflow in the absence of the G signal,

and non-programmable

• Attach

non-programmable

programmable
• Attach

• Set Configuration

Option

keypad

label over original

start-up

sticker

homeowner's

Once
in place

the new keypad

cannot

2. Press SET TIME/TEMP
3. Use up and down buttons
ON on large display.

button

17--Enable

default

This option

Non-Programmable

converts

the programmable

between

OF (off) and

is OF (off).

Operation
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
When this option is selected,
the new keypad
applied
over
adhesive-backed

(or

contact,

be made.

label.
keypad

it will stick

CAREFULLY

surrounds.
TO SELECT
mode if not already

"To Enter Configuration
Mode."
buttons to make small (now flashing)

3. Use

See Step 4

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

with

and

button

clown buttons

on large display.

See Step 4

once to flash large display.
to move

Factory default
button

display for selection of another
exit configuration
mode.
REDEFINITION

there.

Use up and clown
display indicate 17.

between

and

is OF (off).

again to flash upper small
option,

or press END

OF BUTTONS

once m flash large display.

to move

Factory

to back

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

Option

Use up and down
display indicate 16.

is to be

label, making sure its position and
from the attached edge, smooth the

4. Press SET TIME/TEMP
"To Enter
Configuration
Mode."
buttons to make small (now flashing)

manual

label makes

and adjustments

locate an edge of the keypad
orientation
are correct. Then,

TO SELECT
there.

instructions

To attach
the provided
non-programmable
keypad
carefully peel off its backing and apply it over the original
label.

OF(oft)
if not already

of the

homeowner.

2. Press SET TIME/TEMP

mode

versions

No. 17 to ON.

• Leave non-programmable

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.

1. Enter configuration

the

of door.

As part of the Comfort

Configuration

Once

one.

non-programmable

1. Enter configuration

system,

permanent.

is done, a procedure
is
Should this change be
for one which has not

Manual are available.
Be sure to leave only the
of the Homeowner's
Manual with the homeowner.

raising leaving air temperature.
For any heating demand below
12°F. G and W/W1 are turned ON, assuring at least 1 stage of
electric heat is on, and also increasing leaving air temperature.
Heat pump

considered

Once it has been determined
that a particular installation
made non-programmable,
the only changes required are

firmly

12" and 40°F.

should

change to non-programmable
operation
not provided
to easily change it back.
needed, it is best to trade the Thermidistat
been converted.

NOTE:

• Reduced

heating.
respond

this

in place of) the original.
keypad labels are not designed

keypad label.
label must be
Because
these
to be removed,

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
1 through 5 and 9) have been redefined.
Button

3 originally

alternated

between

(numbers

time, cool set point,

and

heat set point with each press. Now, button 1 selects the cool set
point, button 2 selects the heat set point, and button 3 selects
time. now used only to set the clock. Note that the days of the
week

are gone.

Button 5 used to alternate between
humidify
and dehumidify.
Now button 4 selects dehumidify
and button 5 selects humidify.
Button 9 now loses the HOLD label, making
button
is only used to END the humidity
configuration
mode.

it END only. This
screen
and the

These changes both simplify operation
for the homeowner
and
find use for the buttons
which are no longer
needed
when
programmability
is removed.

Fig.2- Programmable/Non-Programmable

Keypad

PROGRAMMABLE
CONFIGURATION
(OPTION t7 OFF)

Labels

NON-PROGRAMMABLE
CONFIGURATION
(OPTION 17 ON)
Aggo5g

Step 5--System

Start-Up

The Thermidistat

Control

and Checkout
is designed

with a built-in

installer

capability. It allows easy operation of equipment without
or set point adjustments
to force heating or cooling.
To enable

installer

test

mode.

move

position. To access this switch, open
Use the corner of a small screwdriver

DIP switch

test

delays

case as described in Step 2.
to slide switch No. 4 to ON

in installer setup mode, clock will display "InSt." FAN
will control fan, and MODE button will control heating

and cooling.
TO TEST

equipment

types are listed in Table 2.
HEATING

Auxiliary heating only exists
MODE button until EHEAT

in heat pump systems. To test, press
icon turns on. This will be electric

heat in standard heat pump systems and furnace in Hybrid Heat
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
run time, heating may
be turned off by pressing
MODE button until OFF appears.

FAN

Fan button

for different

TO TEST AUXILIARY

No. 4 to ON

position.
While
button

button turn humidify
output on and off. While this output is
active, "hu" appears in heat set point display. Equipment
outputs

switches

FAN icon between

AUTO

and ON. While

Actual

outputs

for different

equipment

types are listed in Table 2.

ON is displayed, G output will be on, turning fan on. Allow up to
10 sec after button is pressed fnr fan to turn on and off. On some

Step 6--Final

fan coils,
removed.

fan

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

TO TEST

COOLING

continues

to operate

for 90 sec after

G signal

AND DEHUMIDIFICATION

Settings

after installation
is complete,
use MODE button to select between
HEAT, COOL, or AUTO to provide desired operation of heating,
cooling, or both.

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

The default set points and programmed
schedule conform to the
Energy Star@ requirements
of the U.S. Department
of Energy for

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

both
heating
and
temperature
settings.

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
Equipnmnt
Table 2.
TO TEST
Press

is active, "dh" appears
in cool set point display.
outputs for different equipment
types are listed in

MODE

button

HEATING
until HEAT

is to be used,

is turned

on and off by HOLD

heating

icon is

button.

If fixed temperatures
are desired, use HOLD button to turn on
HOLD icon. This will maintain set points, not allowing them to
with programmed

schedule.

icon turns

only with equipment)
and FAN (fan on continuously)
fan modes.
For further
information
on temperature
selection
and
programming,
refer to Homeowner's
Guide.

on. Primary

back to OFF. At any time during 4-minute
may be turned off by pressing MODE button
While

make sure HOLD

saving

The
heating

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

appears.

schedule

off. This feature

energy

AND HUMIDIFICATION

begins within 10 sec and remains on for 4 minutes. This will be
furnace or electric heat in AC system and heat pump heating in

reverts
heating

provide

If programmed

change
PRIMARY

cooling.
These
Refer to Table 3.

is on, successive

presses

run time,
until OFF

of HUMIDITY

FAN button

may be used

HUMIDITY

to select between

CONTROL

AUTO

(fan on

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 section,
instructions on how to select each feature are given.

Table
2---Equipment
1-Stage A/C

Outputs

2-Stage

A/C

1-Stage

2-Stage

Cool---0 to 2 minutes

Y,G

Y1, G

Y,G,O

Cool--2

to 4 minutes

Y,G

Y1, Y2, G

Y,G,O

Y1,Y2 G, O

Y1,G,O

Heat---0

to 2 minutes

Y,G

Y1,G

Wl, W2

Y, G

Y1, Y2, G

Heat--2

to 4 minutes

EHeat--0

to 2 minutes

EHeat--2

to 4 minutes

WI, W2t

WI*

2 stage heat not available.
NOTE: For Y use terminal Y/Y2. for Y1 use terminal YliW2. for W2_tse terminal O/W2
For O use terminal O/W2, for Wl use terminal W/W1, for W2_ use terminal Y1/W2.
HUMIDIFICATION
The Thermidistat
Control directly
humidifier to control humidification

connects to a standard 24vac
in the home. A humidify set

point between 10 and 45% relative
homeowner,
or all humidification
humidity
turned

in home

drops

below

on to raise humidity

humidity
is selected by the
can be turned off. When

set point,

humidifier

level. Humidification

3--Energy

Star Default

can only occur

in heating
mode (HEAT
or AUTO/HEAT).
Five
humidification
selections are available and are described

Table

will
different
below.

Schedule

temperature
between
50 =_F and 0 °F. The
changed
at any time, and it will continue

Heat

Cool

Wake 6:00 AM

68 ° F

78 ° F

Day 8:00 AM

60 ° F

85 ° F

Evening 5:00 PM

68 ° F

78 ° F

Sleep 10:00 PM

60°F

85°F

outdoor
message

temperature
sensor
will be displayed.

4. Auto

and Fan Humidify

Humidify

In normal

humidify,

be attached.

If not, E3 error

together.

This

Off

The humidify function can be turned off completely.
not require changing existing set points.
Humidification

(Between

NORMAL,

This

does

FAN, AUTO,

FAN and AUTO,

or OFF) (See Table

4.)

Press HUMIDITY
indicated by "hu"

button to bring up humidity select screen. It is
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
humidifier

will be on if there

is a humidity

demand
and any heating equipment
is on. 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

MUST

The 2 choices of AUTO and FAN can be selected
provides both functions simultaneously.

To Select

1. Normal

may be
outdoor

temperature
from the new set point
and current
outdoor
temperature.
The adjusted
set point range is still limited to
between
10 and 45% relative humidity. To use this feature, an

5. Humidify

Schedule

set point
to track

humidity

when auxiliary

heat is on.

level.

The

humidity
Humidity

smaller

display

(in

heat

set point

location)

shows

set point (Humidify
Set Point) or OF (off). When
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.

2. Fan Humidify
This configuration
humidifier
particularly

allows

a humidify

together,
even if there
useful when the furnace

demand

to turn on fan and

is no heat demand.
It is
is oversized,
resulting
in

To exit humidity
Additional

select screen,

Humidify

The humklifier

press END button.

Comments

is actually

turned

on when humidity

is 2% below

short heating
cycles. It allows the humidifier
to run longer,
supplying
more humidity
to the home. Note that fan hours will

set point and turned off when it reaches 2% above set point. This
built-in
hysteresis
prevents humidify
output from toggling
on

increase,
nmisture

and off when humidity

using more electricity. Also, the humidifier
to cooler air than it does to heated air.

delivers

less

The vacation
mode provides
some additional
humidification
functions. These are specially designed to provide protection
for

3. Auto Humidify
This

feature

is designed

level is near set point.

to eliminate

the problem

of sweating

windows
in very cold weather. When selected, the set point is
automatically
reduced by 1% for every drop of 2°F in outdoor
Table

4_Humidification

an unoccupied
home while simultaneously
use. Refer to "Vacation" section for additional

minimizing
information.

Selections

Selection

Mode Display

Fan Display

Normal Humidify

Blank

Humidify

Humidify Set Point Value

Set Point Display

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

OF (Off)

energy

Table

Selection
Normal
Humidify
Cool
toDehumidify
Dehumidify
OFF

5--Dehumidification

Selections

Mode Display
Blank

Blank

COOL

Blank

DEHUMIDIFICATION
Dehumidification
is done only during cooling.
Depending
type of equipment
used, compressor
speed, blower speed,
point adjustment,

and equipment

cycling

are modified

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.

on
set

to provide

Superdehumidify

added dehumidification.
A dehumidification
set point (separate
from humidification
set point) is available to the homeowner.
It
can range from 50 to 90% relative
humidity.
When actual
humidity
is higher than set point, a dehumidification
demand
exists. The
dehumidify

Thermidistat
Control
responds
by activating
output.
It may also control
the compressor

blower, depending
on equipment
choice. The 3 available selections
The amount

type and dehumidify
are described below.

of extra dehumidification

available

Humidify
SetPointDisplay
Dehumidify
SetPoint
Value
Dehumidify
SetPoint
Value
OF(Off)

Fan Display

This

selection

(With
only

Cool to Dehumidify)

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

its
and

indoor
unit
with
super-dehumidify
capability.
During
cool-to-dehumidify
call, it provides maximum
dehumidification
by reducing airflow to a mininmm.
The actual super-dehumidify
command
from Thermidistat
Control to the indoor unit is a Y

selection

is very dependent

signal

without

a G signal

in addition

to dehumidify

signal.

The

on the type of equipment in the home. Without a variable-speed
blower, the system's
ability to adjust dehumidification
is very
limited.

indoor unit responds to this combination
by reducing the airflow
to a mininmm. All other characteristics
of cool to dehumidify
are
the same.

1. Normal

Additional

When

Dehumidify

normal

Operation

dehumidify

turn on without
while cooling,

is selected,

the compressor

will

not

Dehumidification
turning blower

a cooling demand. If dehumidify
demand exists
dehumidify
output will also be active (24vac

removed).
This output commands
variable-speed
blowers
reduce their airflow, which improves
water removal from
cooled air.

Dehumidify

Comments

can he enhanced (with some efficiency loss) by
off immediately
at the end of each cooling cycle

(eliminating
normal 90 sec blower off delay). Where maximum
humidity removal is desired, this should be done. if possible. Fan

to
the

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

2. Cool to Dehumidify
The cool to dehumidify
selection
compressor,
within limits, when

tells the system to operate the
there is a dehumidify
demand

operation
(fan ON icon displayed),
minutes at the end of each cooling
demand exists.

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
overcoaling
overcooling
must occur, the

G output is turned off for 5
cycle as long as dehumidify

Like humidify,
dehumidify
actions are initiated when humidity is
2% above set point and are terminated
when humidity
drops to
2% below
set point. This prevents
unnecessary
toggling
of

and humidity
satisfaction.
When
dehumidify
set point is adjusted

dehumidify

upward by 2% per degree of overcooling.
For example, a cooling
set point of 76°F and a dehumidify
set point of 60% is equivalent

The

actions

vacation

when humidity

mode

contains

is near set point.

additional

dehumidify

features

to a cooling set point of 75CF and a dehumidify
set point of 62%.
This dehumidify
set point change is internal to the Thermidistat
Control and is not shown on the display.

designed to protect an unoccupied
section for additional information.

home. Refer to the "Vacation"

With

if the system

During cool-to-dehumidify
maximum
of 10 minutes

compressor

demand,
on, followed

the compressor
runs a
by 10 minutes off. When

In most

furnaces

after both
removed,

on) signal
turns off.

and fan coils,

Y and G disappear.
if possible,
for

performance.
Consult furnace
to see if delay can be disabled.
3. Dehumidify

is removed

for 5 minutes

operates

or fan coil Installation

has

a 2-speed

NOT

have

Option No. 5 set to OFF),
while dehumidify
demand

the combination
blower generally

of 2-speed
compressor
has poor water removal

Output

and Equipment

Connections

DHUM output terminal. In other words, dehumidify
output logic
is reversed -- output is turned ON when no dehumidify
demand

Instructions

exists and is turned OFF when demand exists. This logic reversal
has come about from historical use of a standard humidistat to do

can be turned off completely.
existing set points.

To Select Dehumidification
and OFF)

and does

When there is a dehumidify
demand,
dehumidify
output is
activated, which means that a 24vac signal is removed
from the

Off

Dehumidification
without changing

No. 2 is ON)

on low speed.

for 90 sec

This 90-sec
delay should
maximum
dehumidification

selection,

switch

exists. This is because
without variable-speed

Dehumidify

the blower

(DIP

variable-speed
blower (Configuration
all cooling will be done at high speed

the compressor
turns off, the fan (G output) is also turned off
immediately.
The immediate fan shutoff prevents re-evaporation
of water on the coil, improving
dehumidification.
If fan is set to
continuous,
the G (fan
starting when compressor

any dehumidify

(Between

dehumidification.
humidity,
thus

This can be done

NORMAL,

COOL

dehumidification.
Equipment
manner, so the Thermidistat

TO,

existing

Press HUMIDITY
button to bring up humidity
selections.
Successive presses will show "hu" or "dhu" in clock display.
Select "dhu"for

dehumidify

selections.

actual humidity
location) shews

level. The
dehumidify

smaller display
set point (DSP)

The humidistat
contacts
open on high
removing
a 24vac
signal
to initiate
has been designed to operate in this
Control must now accommodate
the

equipment.

shows

Carrier FK and FV Series Variable-Speed
Fan Coils. all 58UHV
and 58UXV
80% Variable-Speed
Furnaces,
and 58MV 90%
Variable-Speed
Furnaces
with
the DE connection
have

(in cool set point
or OF (oft'). When

dehumidify
inputs which connect directly to Thermidistat
Control
DHUM output. They are compatible
with the reverse logic output

The large

display

andwillreduce
theircooling
CFMbyapproximately
20%
when
a
dehumidify
demand
ispresent.
TheFKandFVSeries
FanCoilshave
aterminal
marked
DH
whichshould
beconnected
totheThermidistat
Control
DHUM
output.
Jumper
J1onfancoilMUSTberemoved.
It islocated
behind
theDHterminal.
Additionally
blower
delaytaponfan
coilshould
besetto0/0(noONdelay
andnoOFFdelay)
when
usingcooltodehumidify.
Withthisselection,
theblower
stops
whenG signal
isremoved,
preventing
re-evaporation
ofwater
fromthecoilwhich
would
occur
during
thenormal
90secblower
offdelay.(See
WiringDiagram
Reference
ChartandFig.5
through
8inWiring
Diagram
literature.)
On58UHV
and58UXV
furnaces,
agreen
wiremarked
DHUMis
connected
toa spade
lugwhichisconnected
totheGinput
terminal.
Unplug
spade
lug,cutoffspade
receptacle
fromwire
end,andsplicea wirebetween
greenDEHUMwireand
Thermidistat
Control
DHUMterminal.
(SeeWiringDiagram
Reference
ChartandFig.17through
20in WiringDiagram
literature.)
Carrier58MVPfurnaces
alsohavea DEHUMinput.The
DEHUMinputactsdifferently
depending
onwhichstyleof
variable
speed
furnace
controlyouhave.Theolderstyle
variable-speed
furnacecontrolDOESNOThavea DE
connection
whilethenewer
stylevariable-speed
furnace
control
hasa DEconnection.
Bothofthesevariable-speed
furnace
controls
function
thesame
except
theDEHUM
logicisreversed.
Ontheolder style variable-speed
furnace
controls, a field
supplied

relay

is required

between

the Thermidistat

and furnace. The relay coil is connected
on the Thermidistat
Control and COM

between
terminal

Vacation

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.
Vacation

is a spade

connections.
through
demand
contacts
result the

lug located

(See Wiring

be different from that of occupied.
Vacation dehumidification
selection and set points are remembered
the next time vacation
used.
Cool

Reference

operates

degree of overcooling
at 74 °F dehumidify
dehumidify
dehumidify

slightly

differently,

allowing

the

for temperatures
below 76°F. For example,
set point
is raised
2%, and at 72 °F

set point is raised 4%. At temperatures
set point is not changed.

OPERATIONAL

Control

FIVE-MINUTE

above

76°K

INFORMATION

COMPRESSOR

TIMEGUARD

This timer prevents compressor
from starting unless it has been
off for at least 5 minutes. It can be overridden
for 1 cycle by
simultaneously
pressing
FAN
button
and
INCREASE
TEMPERATURE
button.

secondary

(?hart and Fig. 21

FIFTEEN-MINUTE

24 in Wiring Diagram
literature.)
When a dehumidify
exists, relay is de-energized,
and normally
closed
supply 24vac to the furnace DEHUM
terminal.
As a
furnace control reduces the blower airflow by 15%.

On newer
style variable-speed
supplied
relay IS NOT required.

to dehumidify

honm 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% set point increase per

DHUM output
on the furnace

next to the transformer

Diagram

Dehumidification

Normal Dehumidify,
Cool to Dehumidify.
and Dehumidify
OFF.
are all available in vacation mode, and selection of 1 of these can

control. Its normally closed contact is connected
between R and
DEHUM terminals on the furnace control, where the DEHUM
terminal

Humidification

CYCLE

This timer prevents

TIMER

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 overridden
for 1 cycle when desired temperature
is
manually
changed.
It can also be overridden
for 1 cycle by
simultaneously
pressing
FAN
button
and
INCREASE
TEMPERATURE
button.

furnace
controls,
a fieldThe DHUM output on the

Thermidistat
Control is instead connected directly to the DEHUM
terminal on the furnace control, where the DEHUM terminal is a

FIFTEEN-MINUTE

STAGING

TIMER

spade lug located next to the transformer
secondary connections.
In addition the DE jumper located next to the DEHUM terminal

In multistage

must be removed
to enable the DEHUM
input. (See Wiring
Diagram
Reference
Chart and Fig. 25 through
28 in Wiring

stage from turning on until preceding
stage has been on for 15
minutes. This timer is overridden
if temperature
error is greater

Diagram
literature).
When a dehumidify
demand
furnace control reduces the blower airflow by 21%.

than 5 °F (usually

exists

the

In normal

Vacation

mode

also has an automatic

Set Points

A special

set of temperature

are active
homeowner,
remembered

set points exists

and lower

any higher

in desired temperature).

ON TIME

when a stage turns on, it will not turn off for

SET POINTS

(DESIRED

this timer is
to turn off

TEMPERATURE)

to "push"
adjustable

the other, to maintain this difference.
via Configuration
Option 14.

This difference

ON INDICATORS

which

in vacation
mode.
They
are adjustable
by
are exclusively
for vacation
mode.
and
from 1 vacation
selection
to the next. These

points will be higher for cool and dehumidify
and humidify than those of occupied mode.

prevents

A minimum
difference
of 2 _ is enforced
between heating and
cooling desired temperatures.
This is done by allowing 1 setting

EQUIPMENT
and humidity

MINIMUM

operation,

HEAT/COOL

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.
Vacation

this timer

a minimum
of 3 minutes. If the set point is changed,
automatically
canceled,
allowing
the equipment
immediately
when the demand is removed.

A vacation selection is available specifically
for times when the
home will not be occupied
for an extended
period.
For
convenience,
1 button selects vacation mode which is indicated
icon on display.

or cooling,

due to a large change

THREE-MINUTE

VACATION

by OUT

heating

When cooling
equipment
is on,
small triangle is displayed
below
equipment
operation
is delayed

the
are
set

a COOL icon preceded
by a
cool set point. While cooling
by a staging
or cycle timer.

triangle
will flash. The same is true for HEAT icon and its
preceding triangle located under heat set point. These 2 arrows

for heat

are also used to indicate
outputs. See next section.

state

of humidify

and dehumidify

HUMIDIFY
ANDDEHUMIDIFY
INDICATORS
The

humidity

screen

(selected

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.
AUTO

CHANGEOVER

When

auto changeover

mode

is selected,

a change

from

energized

ON CHECK

When
turned

AC--1

Replace

Control's

internal

Thermidistat

E6 -- If defrost cycle continues
will be displayed.
Check heat
pump

properly

read

room

(except

fan if

memory

fails, E4 will be

Control.

via following

2-digit

RECOVERY

code.

adjusts room temperature
so desired temperature
will be achieved
at selected recovery
time. The fixed time period is 1.5 hr. It
operates
in both heating
programmable
operation.

auxiliary

for longer than 15 minutes. E6
pump wiring or for failed heat

With Smart Recovery selected, transition out of setback begins a
fixed time period before selected recovery
time and gradually

HP--l-stage
heat pump
A2--2 - stage air conditioner
with 3-stage

defrost control.

SMART

H2--2- stage heat pump
HS--l-stage
heat pump
Heat

cannot

-- and all outputs

E5 -- If Thermidistat
Control cannot properly read humidity,
will be displayed. Replace Thermidistat
Control.

- stage air conditioner

d2--Hybrid

If Thermidistat

displayed.

upon a call for heat.

model/configuration

Control

will indicate

E3 -- If Thermidistat
Control
cannot properly
read outdoor
temperature,
and it is needed for proper operation,
display will
indicate E3.

AC power is first applied,
all segments
of display
are
on for a few seconds. Following
this, temperature
display

indicates

If Thermidistat

E4 --

When Thermidistat
Control is configured
as a heat pump and
emergency
heat is selected, all Y signals are locked out, and W
POWER

....

El, E2 -- There are no E1 or E2 error messages.

heat to

HEAT MODE

becomes

CODES

temperature,
display
on) will turn off.

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.
EMERGENCY

ERROR

and cooling.

This

only

applies

heat df--Hybrid

Heat with 2-stage.

Thermidistat

"- -"

"E3" or "--"

Control

Troubleshooting

SYMPTOM

WHAT TO CHECK

No Display

Open Thermidistat Control. Check for 24vac between R and C at screw terminals on mounting base. Reassemble, making sure pins on board engage sockets in mounting base. If
display does not appear, replace Thermidistat Control.

in place of room temperature

in place of outdoor temperature
"E4" or "E5"
"E6"

Control cannot properly read room temperature.

Thermidistat
its wiring.

Control cannot properly read outdoor temperature.

Internal failure. Replace Thermidistat

Replace Thermidistat

Control.

Check outdoor sensor and

Control.

System is stuck in defrost. Check wiring and heat pump defrost control board.

"Clean Filter" icon displayed
Cooling or heating will not come on

Humidify or dehumidify

Thermidistat

wilI not come on

Filter timer has expired. Clean or replace filter and then press VACATION and HOLD/END
buttons together to reset.
See Installer Setup to force heating or cooling. Check for 24vac at equipment
not present, check wiring.

terminals. If

See Installer Setup to force HUM or DEHUM. Check for 24vac at equipment terminals. If not
present, check wiring.

I
I

,¢1

THERMIDISTAT

CONTROL

CONFIGURATION

RECORD
Date

Owner/Operator

Thermidistat

Model No.

A) Hardware Configuration
Switch A ....
AC/HP Select. (OFF = AC)
Switch B ....
1 or 2-Speed Compressor.
(OFF = 1-Speed)
Switch C ....
Smart Recovery. (OFF = Enable)
Switch D ....
Installer Test. (OFF = Disable)

Mode

Settings
Hold (On or Off)
Mode (Off, Heat,

....
....

Heating
Cooling
Fan

Configuration

Set Point
Set Point

(Auto

Cool,

Auto,

Eheat)

Value
Value

or On)

Options

1
2

......
......

Anticipator
(1-9: factory
Clean
Filter Timer
(Off

default
= 3)
or 1-9: factory

3
4
5

......
......
......

Fahrenheit
or Celsius
(F or C: factory
default
= F)
Fan On with W (Off or On: factory
default
= Off)
Variable
Speed
ICM Motor
(Off or On: factory
default

6
7
8

......
......
......

Cooling
Variable
Auxiliary

9
10

......
......

Intelligent
HybridHeat

11
12
13

......
......
......

Balance
Point Setting
(Off or 5-55°F:
factory
default
= Off, or Not Available)
Defrost
Heat Select
(0, 1, 2, 3: factory
default
= 0, or Not Available)
Room Temperature
Offset
(-5 to +5: factory
default
= 0)

14
15
16

......
......
......

Heat/Cool
Dead Band (0 to 6: factory
default
= 2)
Enable
Auto Mode (On or Off: factory
default
= On)
Enable
Super Comfort
Heat Mode (Off or On: factory

......

Enable

default

= 2)

= Off)

Lockout
Below 55°F (Off or On: factory
default
= Off)
Speed
Superdehumidify
(Off or On: factory
default
= Off, or Not Available)
Heat Lockout
Setting
(Off or 5-55°F:
factory
default
= Off, or Not Available)
Heat Staging
Equipment

Non-Programmable

Selection
Selection

(Off or On: factory
default
= Off, or Not Available)
(Off or O:nfactory
default
= Off, or Not Available)

Operation

default

(nP or P: factory

default

is Off,

or not Available)

is P for

programmable)

Schedule

WAKE
TIME

DAY

HEAT

COOL

TIME

HEAT

EVE
COOL

TIME

HEAT

SLEEP
COOL

TIME

HEAT

COOL

Mon
Tue
Wed
Thu
Fri
Sat
Sun

E) Humidity
Heat Mode

Settings
Cool

Selection

Set Point%

Normal Humidify
Fan Humidify
Auto Humidify
Auto and Fan Humidify
Humidify Off
E) Vacation
Heat Mode

Humidity

Selection
Normal
Humidify
Auto Humidify
Auto and Fan
Humidify
Off

Mode

no set point

Display_
(hu)
(hu, Fan)
(hu, AUTO)
(hu, AUTO, Fan)
(hu, OF)

Selection
Normal Dehumidify
Cool to Dehumidify
Dehumidify Off

Set Point%

Display
(hu, OUT)
(hu, OUT, AUTO)

Selection
Normal Dehumidify
Cool to Dehumidify
Dehumidify Off

Set Point%

no set point

Display
(d hu)
(d hu, COOL)
(d hu, OF)

Settings
Cool Mode
Set

Point%

Humidify
no set point

(hu,
(hu,

OUT, AUTO,
OUT, OF)

Fan)

no set point

Display_
(d hu, OUT)
(d hu,OUT, COOL)
(d hu, OUT, OF)

A06105

7_lanufacturer

2006

6;alller

Crop

•

rese_'es

the

tight

7310

Vv' Mo1_is

to change,

St •

any

Indianapolis,

time,

specifications

46231

and

Printed

designs

iit USA

without

notice

Editimt

and

without

Date:

obligations,

04'06

Catalo_

No: TSTAT-32SI

Replaces:

TSTAT- 23Sl

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CARRIER Controls And HVAC Accessories Manual L0606346

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