Smart Temp 43503 CTC User Manual

Owner’s Manual Model 43503

7-Day Auto Changeover

5:

7

2

2

2

3

Smart Temp

Table of Contents

Read This Before Installing Thermostat 6
Features 8

What You Need 10
Remove Old Thermostat 10
Wire Labeling 11
Mount Wallplate and Thermostat 12
Selector Switches 14

Setting Time and Day 16
Auto Programming 17
Personal Program Schedule 18
Manual Programming 19
Weekday / Weekend Programming 19
7-Day Programming 21
Reviewing Programs 22
Reviewing the Current Temperature Setting 23

System Selector Switch 24
Fan Switch 24

(continued)

INTRODUCTION

INSTALLATION

PROGRAMMING

OPERATIONS

4-5

OPERATIONS (continued)

SAFETY FEATURES

TROUBLESHOOTING

WIRING DIAGRAMS

Temporary Manual Override 24
Permanent Manual (Vacation) Override 25
Auto Season Changeover 26
Home Today 26
Energy Monitor 28
Filter Monitor 29
Auto Recovery 30
Keyboard Lock 31
Backlighting 31

Low Battery Warning 32
Error Mode 33
Auto Cut-Off 33

Problems & Solutions 34
Technical Support 35

Heat / Cool Systems 36
Single-Stage Heat Pump Systems 37
Heat Only / Cool Only Systems 38

Table of Contents (continued)

IMPORTANT

1

Read the entire installation section of this Owner’s
Manual thoroughly before you begin to install or

operate your CTC Thermostat.

INSTALLATION

2

All installation is normally performed at your
thermostat.

ARMCHAIR PROGRAMMING

3

Y

ou can program your thermostat before installation by

inserting the batteries and following the instructions
starting on page 16. This can be done while you relax in
your favorite chair and is a very good way to familiarize
yourself with all the functions of your CTC Thermostat.

Note: At initial power-up this thermostat is programmed at 68°F
(20°C) for Heat and 78°F (26°C) for Cool. Any change to the set
temperature will be treated as a Permanent Manual Override. See
page 25 for more information. Press Auto Program to load the
built-in energy saving programs.

OPERATION

4

Y

our Thermostat is designed to operate with most gas,

oil, electric or 2-wire hot water heating and air
conditioning systems. It will also operate single-stage heat
pumps that do not have auxiliary or emergency heat.
These have 24-volt or millivolt control systems and

represent most central heating, air conditioning, or space
heating units in use in the United States.

This CTC Thermostat will NOT control multi-stage heat
pumps or 220 Volt systems (Optional SmartPak Interface Available)

COMPRESSOR PROTECTION

5

T

he thermostat provides a 3.5 minute delay after

shutting off the heating or cooling system before it can
be restarted. This feature will prevent damage to your
compressor caused by rapid cycling. Note that this delay
also applies to the heating system control. It does not
provide a delay when there are power outages.

TEMPERATURE RANGE

6

Y

our thermostat can be programmed between 40°F

and 95°F (4°C and 35°C). However, it will display room
temperatures from 32°F to 99°F (0°C and 37°C). “HI” will
be displayed if the temperature is higher than 99°F (37°C),
and “LO” will be displayed if the temperature is lower than
32°F (0°C).

NOTE: The thermostat will automatically change to the Cool
mode if the thermostat measures a temperature over 99°F
(37°C). “Hi” will be displayed on the LCD, and the Cooling
system will turn On. Similarly, the thermostat will
automatically change to the Heat mode if the temperature is
below 32°F (0°C). “LO” will be displayed on the LCD, and the
Heating system will turn On.

Read This Before Installing Thermostat

6-7

Read This Before Installing Thermostat (continued)

POWER FAILURE

7

W

henever the main power is interrupted or fails, the

battery power retains the programs and current time.

AUTO RECOVERY

8

Your thermostat is set from the factory to gradually recover

the room temperature from an energy saving program to
your comfort program. Therefore, the thermostat may turn
your system on several minutes prior to your programmed
time. This operation is normal, but can be turned off. Refer to
the Selector Switches information on pages 14-15.

BATTERY WARNING

9

F

resh alkaline batteries should provide over one year of

service. However, when the batteries become drained,
“BATT” will alternate on the display with the current time.
When this message occurs, install 2 new AA batteries. You

have approximately 1 minute to change the batteries and
keep thermostat’s clock and program settings. Once the
batteries have become too low to ensure proper operation,
your system will be turned Off, and the display will be
cleared except for “BATT” flashing on the LCD display.

CAUTION: Once the “BATT” only display occurs, the
thermostat is shut down, and your system will no longer
operate. In this condition, there is no temperature control of
your dwelling.

NOTE: The INDIGLO

®

night-light will not function when the

thermostat is in low battery condition.
NOTE: If you plan to be away from the premises over 30

days, we recommend that you replace the old batteries with
new alkaline batteries prior to leaving.

!

Features

HOME TODAY: Overrides energy­saving program temperatures while
you are at home for the day.

ENERGY: Measures and
displays heating and
cooling system operating
time for Today, Yesterday,
This Week, Last Week, or
Total. By monitoring your
energy usage, you can
program the thermostat to
optimize energy savings.

Temperature Keys: Keys
for raising or lowering
temperature settings.

Soft-touch
programming keypad,
see details below.

Light Bar: Activates INDIGLO

®

night-light to allow display
viewing in the dark.

System Switch: System
selector switch for Cool,
Off, Heat or Auto.

Fan Switch: Fan switch for
Automatic or Continuous
On fan operation.

Battery Door: Front­access battery door
allows easy battery
changes.

Alpha-numeric display shows time, day,
temperature, program number, and other
feature information as required.

8-9

COOL AUTOOFF HEAT

AUTOONFAN

M T W Th F Sa Su SET TEMP

AM
PM

C

C

H

M

°

°

TEMP

AUTO COOL HEAT

Usage Today Yesterday This Week Last WeekT otal

1234

HOME
TODAY

ENERGY

Provides permanent
temperature setting by
overriding stored
programs. It also returns
the thermostat to current
program control from
manual override or Home
Today mode.

For entering minute of day.

Enters Program Mode for
reviewing and changing
weekday, weekend, or
daily programs.

Selects the day
or days to review
or change in
Program Mode.

Returns display to
current time and
temperature.

Automatically
programs the
thermostat to its
built-in E

NERGY

S

TAR

®

compliant
program
settings. See
page 17.

For entering day of week.

Reviews filter usage in
hours and minutes. Also
resets filter counter to zero.

For entering hour of day.

MIN

AUTO

PROGRAM

HOLD

CLEAR

HOUR

PROG

DAY

FILTER

PROG

DAY

RETURN

As an E

NERGYSTAR

®

Partner,
Climate Technology Corp.
has determined that this
programmable thermostat
meets the E

NERGYSTAR

®

guidelines for energy
efficiency.

10-11

INSTALLATION

This thermostat includes two #8 slotted screws and two wall
anchors for mounting. To install your thermostat, you should have
the following tools and materials.

■ Slotted Screwdriver(s)

■ Phillips Screwdriver

■ Hammer

■ Electric drill and 3/16" bit

■ Two 1.5 V (AA) size alkaline batteries

What You Need

CAUTION: Do not remove any wiring from existing
thermostat before reading the instructions carefully.
WIRES MUST BE LABELED PRIOR TO REMOVAL.

■ IMPORTANT! Turn off the power to the furnace at the main
power panel or at the furnace.

■ Remove existing thermostat cover. See Figure 1. Some
thermostats will have screws or other locking devices that must
first be removed. Once wall mounting plate is exposed,
look for wir

es.

If wires are not visible, they may be connected to the back of
the wallplate. Again, look for screws, tabs, etc. Some models
have doors that open to expose wires and mounting screws.
(See Figure 1).

Remove Old Thermostat

TYPICAL HOME THERMOSTATS

Figure 1

Wall Mounting Plate Thermostat Cover

Wall Mounting Plate Thermostat Cover

■ Each wire coming from the wall to the existing thermostat is
connected to a terminal point on that thermostat. Each of these
terminal points is usually marked with a code letter as shown in
Table A on this page.

■ The number of wires in your system can be as few as two (for
heat only systems), as many as eight, or any number in between.
If you follow the labeling procedures correctly, you do not have to
be concerned about how many wires there are.

■ There is often no terminal marking on the existing thermostat of two
wire, heat only systems. Just connect either of the wires to the RH
terminal, then connect the other wire to the W terminal to complete
the circuit.

■ IMPORTANT! BEFORE DISCONNECTING ANY WIRES, APPLY
THE SELF-ADHESIVE LABELS PROVIDED TO THE WIRE AS
SHOWN IN TABLE A ON THIS PAGE. (For example, attach the
label marked W to the wire which goes to the W or H terminal on
your existing thermostat.) IGNORE THE
COLOR OF THE WIRES since these do
not always comply with the standard.

■ After labeling wires, disconnect them from
the existing thermostat terminals.

■ Remove existing wallplate. To make sure
wires do not fall back into wall opening,
you may want to tape them to the wall.

■ If hole in wall is larger than necessary for wires, seal this hole so
that no hot or cold air can enter the back of the thermostat from
the wall. This air could cause a false thermostat reading.

Wire Labeling

If the code letter on your
existing thermostat is

then mark the wire
with label shown

and connect to thermostat
terminal shown

NOTE: Do not connect a “Common” wire (sometimes labeled “C”) to any terminal on this thermostat. Tape up the wire and
do not use. This wire provides electricity to non-battery powered thermostats.

W

G

Y

RH

RC

RH

G

W

RC

O/B

Y/Y1

RH

RH

RC

RC

G

G

Y/Y1

Y/Y 1

W

W

O/B

O/B

RH, R,
VR or 4
24 Volt

G or F
Fan

RC, VC
24 Volt Cool

Y, Y1, C or M (See Note)
Air Conditioning
Compressor

W or H
Heating
Not for heat pumps

O, B, or R
Reversing Valve
(Single-stage
Heat Pumps only)

Table A

■

Remove the wallplate from your thermostat by pressing the
release tab on the bottom of the thermostat. (See Figure 2.)

■

Position wallplate on wall and pull existing wires through large
opening. Then level for appearance. Mark holes for plastic
anchors provided if your existing holes do not line up with
those on the CTC wallplate.

■

Drill holes with 3/16” bit and gently tap anchors into the holes
until flush with wall.

■

Reposition wallplate to wall, pulling wires through large
opening. Insert mounting screws provided into wall anchor
and tighten. (See Figure 3.)

12-13

INSTALLATION

Mount Wallplate and Thermostat

NOTE: 5-wire Systems

If your thermostat has one wire marked R or RH (4-wire system), then leave the jumper wire between the RH and RC terminals on
the wallplate.

Otherwise, if you have separate RH and RC wires (5-wire system), then remove the jumper wire between the RH and RC terminals.

Figure 2

OB

RC

G

Y/Y1

W

RH

Figure 3

■ Match and connect the labeled wires to the appropriate

coded terminal screws on the mounting plate. (See
Figure 4, 5.) Ignore any wires which may be present,
but which were not connected to the old thermostat.

■ Be sure to tighten the terminal screws securely, otherwise

a loose wire could cause operational problems with your
system or thermostat.

■ Push excess wire back into hole to prevent interference

with mounting of the thermostat cover.

■ Make sure the System Switch is set to OFF, and the

FAN-AUTO Switch is in AUTO.

■ If your system has an O or B wire, you must move the

Heat Pump selector switch to the appropriate position.
Refer to the next page for more information.

■ Insert the bottom tab on the thermostat body into the
slot at the bottom of the wallplate. Press top of the
thermostat body to snap it into the wallplate. (NOTE:

Do not force the thermostat onto the wallplate, as
the terminal pins may be damaged. If it does not
snap properly, the thermostat may not work.)

■ Insert the two AA size alkaline batteries, observing the
polarity marked on the unit.

■ Switch on the main power at the panel or furnace.

FIGURE 4

FIGURE 5

x

x

x

+

+

+

WRHRCG

Y/Y1 O/B

RH

RH

Connect Wires and Mount Thermostat Cover to Wall Plate

In order for this CTC thermostat to control your system, the system
type must be specified by selector switches on the printed circuit
board inside the thermostat. There are also other selector switches
that allow you to customize the features to suit your needs.

NOTE: When changing these features after installation, move
the HEAT / COOL selector switch to OFF before removing the
thermostat from the wall.

System Selector Switches:

■ Heating system selector (HG – HE switch)

The factory position for this switch is in the “HG” position. Leave
it in this position if you have a gas furnace or an oil burner.

If you have an electric furnace, test to see whether the Heat
and Fan come on as expected.

If Fan operation is normal, leave the switch in the “HG” position.
If the Fan does not come on within a minute of the thermostat

calling for Heat, change the switch position to “HE.”
The system selector has no effect in the cooling mode.

NOTE: “HG” position is for gas and most other systems. “HE”
position is for certain electric systems having a fan relay.

■ Furnace or Heat Pump selector (NORMAL – O – B switch)

The factory position for this switch is in the NORMAL position.
Leave it in this position if you have ANY system that uses gas,
oil, electric, or hot water heating.

If you have a single-stage Heat Pump (no auxiliary or
emergency heat source), then slide the switch to the position
that matches your Reversing Valve type. If your heat pump
system has a “B” wire, slide the switch to “B” for your
reversing valve that activates in HEAT mode. If your heat pump
system has an “O” wire, slide the switch to “O” for your
reversing valve that activates in COOL mode.

14-15

INSTALLATION

Selector Switches

F°/C° selector

(SW5)

12 Hr./24 Hr.

selector

(SW6)

Span selector

(SW7)

Recovery

selector

(SW8)

HG – HE switch

Normal – O – B – switch

SWITCH SETTING

SW

NAME

ON*OFF
SW5 F/C CELSUIS FAHRENHEIT
SW6 12/24 24HOURS 12 HOURS
SW7 SPAN +2F/-1F +1F/-1F
SW8

RECOV.

DISABLE ENABLE

*

DEFAULT SETTING

NORMAL

HE HG

B

O

Switch Setting

Switch Function Alternate Standard

SW 5 F° / C° Celsius Fahrenheit
SW 6 12 Hr. / 24 Hr. 24 Hour 12 Hour
SW 7 Span +2°F / –1°F +1°F / –1°F
SW 8 Auto Recovery Disable Enable

Table B

Feature Selector Switches:

■ F° / C° selector (Fahrenheit / Centigrade) – Switch 5

Your thermostat is set for F° mode from the factory. In order to
change to C° mode, slide the switch to C° and press the reset
button on front of the thermostat with a paper clip.

NOTE: Unless the reset button is pressed, the thermostat
will not change temperature mode.

■ 12 Hr. / 24 Hr. selector – Switch 6

Your thermostat is set for normal 12 hour (AM / PM) time
format. To change to 24 hour (military) time, slide the switch to
the 24 position. This change may be made without resetting
the thermostat, and will automatically change the current time
display and all program times in memory.

■ Span selector - Switch 7

Your thermostat is set to cycle at 1° F (0.5°C) above and below
the set temperature. If you require slower temperature cycles in

Heat mode, you can select +2°F / – 1°F by sliding the switch to
the ALT position. This may be necessary if your heating system
cycles too rapidly.

■ Auto Recovery selector - Switch 8

Your thermostat is set from the factory with the Auto Recovery
Feature enabled, which complies with the EPA E

NERGYSTAR

®

Program. If you prefer to use normal recovery, slide the switch
to the ALT position.

Refer to page 30 for a complete discussion of the Auto
Recovery feature.

Feature Selector Summary:

Table B below summarizes the Feature Switches discussed
above. A similar table is printed directly on the circuit board for
your quick reference.

16-17

PROGRAMMING

Remove the mylar label covering the LCD display window before operating thermostat.

Setting Time and Day

HOUR

MIN

DAY

RETURN

EXAMPLE:

Set the
thermostat
to the
current time
of 9:43 a.m.
on
Saturday.
Refer to
Figure at
right.

■ During time and day setting mode, the temperature and program
displays will go blank.

■ Press and hold to rapid advance to the current hour. Tap to advance one
hour at a time. Note the AM / PM indicator, as the display will cycle
through 24 hours.

■ Press and hold to rapid advance to the current minute. Tap to advance
one minute at a time.

■ Tap to advance one day at a time.

■ When finished, press to return to the Normal time and temperature

display or wait 15 seconds for it to return to Normal mode automatically.

■ Initial display after power-up or reset. The LCD will show the information
when batteries are first installed, or after the Reset button is pressed. The
temperature will update after a few seconds.

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

12:00

SET TEMP

1234

°

C

H

°

C

H

AM

PM

72

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 9:43

SET TEMP

1234

°

C

H

°

C

H

AM

PM

88

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 9:43

SET TEMP

1234

°

C

H

°

C

H

AM

PM

71

Studies conducted by the Department of Energy estimate that
setting your thermostat back 10°F (6°C) for two 8-hour periods
during winter can reduce your fuel bill by as much as 33%. By
setting your thermostat up 5°F (3°C) for two 8-hour periods
during summer you can reduce your fuel bill up to 25%.

Your thermostat is capable of holding up to 4 separate programs
for each day of the week. You can program all weekdays, Monday

to Friday, to the same 4 programs as shown in the table, or each
weekday can have a different set of 4 programs. Similarly weekend
programs, Saturday and Sunday, can be the same 4 programs or
each weekend day can have a different set of 4 programs.

Your Hunter thermostat is pre-programmed to meet the E

NERGY

S

TAR

®

guidelines for energy efficiency. Note that it is easier to

modify these programs than to program the thermostat manually.

Auto Programming

Temperature in F° (C°)

Program Number Time Heat Cool

1 6:00am 68°F (20°C) 78°F (26°C)
2 8:00am 60°F (16°C) 85°F (29°C)
3 4:00pm 68°F (20°C) 78°F (26°C)
4 10:00pm 60°F (16°C) 82°F (28°C)

■ Press once. During Auto Programming, the display will change as shown.

■ The thermostat will be programmed for all 7 days of the week as shown below.

MTWThFSaSu

AUTO COOL HEAT

TEMP

AU:TO

SET TEMP

1234

°

C

H

°

C

H

AM
PM

88

AUTO

PROGRAM

■ Refer to Manual Programming on page 19 for instructions on entering or changing the programs.

18-19

PROGRAMMING

Personal Program Schedule

Day Program 1 Program 2 Program 3 Program 4

Mon. Time Time Time Time

Temp Temp Temp Temp

Tues. Time Time Time Time

Temp Temp Temp Temp

Wed. Time Time Time Time

Temp Temp Temp Temp

Thurs. Time Time Time Time

Temp Temp Temp Temp

Fri. Time Time Time Time

Temp Temp Temp Temp

Sat. Time Time Time Time

Temp Temp Temp Temp

Sun. Time Time Time Time

Temp Temp Temp Temp

Heating

Program 1 Program 2 Program 3 Program 4

Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp
Time Time Time Time
Temp Temp Temp Temp

Cooling

Before programming or changing programs, use this Personal
Program Schedule to determine which times and temperature settings
will best satisfy both your comfort and energy saving requirements.

Use a pencil so you can revise your records each time you
change your temperature settings.

■ Your thermostat can be programmed for weekdays and
weekends, or have unique programs for all 7 days. Use
Weekday/Weekend Programming below or 7-day Programming
on page 21 to enter or revise programs to match your Personal
Program Schedule. The same steps are used when entering
programs for the first time, or revising programs entered during
Auto Programming.

■ When batteries are first installed, the thermostat has all 4 programs
set for 68°F (20°C) in Heat mode and 78°F (26°C) in Cool mode.

NOTE: There are no energy saving time or temperature
settings until the thermostat is Auto Programmed or
Manually Programmed.

■ Familiarize yourself with Manual Programming, so that you can
easily modify your programs as your comfort needs change. The
example below demonstrates the Manual Programming method.

NOTE: 1) The program time can be set in 10 minute

increments, and remains the same for both Heat
and Cool programs.

2) The program temperature can be set in increments
of 1°F (1°C).

3) The Heat setpoint can not be set higher than the
Cool setpoint, and the Cool setpoint can not be set
lower than the Heat setpoint.

4) If the system selector is in AUTO mode, the current
operating mode will be used for programming.

5) After 15 seconds without a key press, the
thermostat will return to normal display mode.

6) When setting the program time, note the AM / PM
indicator.

7) With the Auto Recovery feature enabled, you do not
need to set your comfort program times early. Auto
Recovery will determine how early to turn your
system on, so that the room is comfortable at the
program time.

Manual Programming

Weekday/Weekend Programming

Step 1

■ Slide System Selector Switch to HEAT or COOL to program the
corresponding system.

-- -- -- --

COOL OFF HEAT AUTO

NOTE: If the system selector is in the OFF position, no programming is permitted. The LCD
display will show only dashes when the program key is pressed.

20-21

PROGRAMMING

Weekday/Weekend Programming (cont.)

Step 3

Step 5

■ Press to change to weekend programs.

■ Repeat Steps 3 and 4 to complete the weekend programs.

Step 6

■ If you desire only weekend and weekday programs, press to return to
normal mode.

■ After 15 seconds, the thermostat will return to normal mode
automatically.

RETURN

Step 7

■ Change the System Selector Switch to the other system,
and repeat Steps 2 through 6 above.

PROG

DAY

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 7:30

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

70

MTWThFSa Su

AUTO COOL HEAT

TEMP

1 6:00

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

68

HOUR

MIN

Step 4

■ Press to move to programs 2, 3 and 4.

■ Repeat Step 3 to complete the weekday programs.

PROG

Step 2

■ Press PROG key to enter program mode, display shows weekday programs.

■ Display for HEAT mode shown.

PROG

COOL OFF HEAT AUTO

MTWThFSa Su

AUTO COOL HEAT

TEMP

1 6:00

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

68

Use and to change the setpoint time.

Use and to change the setpoint temperature.

Step 2

Step 3

Step 5

Step 2

■ Press to enter program mode, display shows weekday programs.

■ Press 2 times to reach the Monday program.

PROG

Step 3

PROG

DAY

Step 5

■ Press to change to the next day’s programs.

■ Repeat Steps 3 and 4 to complete the selected day’s programs.

■ Continue repeating Steps 3, 4 and 5 to program all 7 days of the week.

Step 6

■ When finished press to return to normal mode.

■ After 15 seconds, the thermostat will return to normal mode automatically.

PROG

DAY

RETURN

7-Day Programming

Step 1

■ Slide System Selector Switch to HEAT or COOL to
program the corresponding system.

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

1 6:00

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

68

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

8 7:30

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

70

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

1 6:00

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

68

HOUR MIN

Step 4

■ Press to move to programs 2, 3 and 4.

■ Repeat Step 3 to complete the programs for Monday.

PROG

COOL OFF HEAT AUTO

Use and to change the setpoint time.

Use and to change the setpoint temperature.

Step 2

Step 3

Step 5

You may want to review the programs to confirm that the settings are compatible with your lifestyle.

22-23

PROGRAMMING

Reviewing Programs

Weekday
Programs

■ Press to display M – F programs.

■ Press repeatedly to cycle through the 4 programs.

PROG

Weekend
Programs

■ Press repeatedly to cycle through the 4 programs.

PROG

■ Press to display the Sa – Su programs.

PROG

DAY

Step 7

■ Change the System Selector Switch to the other system, and
repeat Steps 2 through 6 above.

7-Day Programming (cont.)

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 6:30

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

70

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 5:30

SET TEMP

123 4

°

C

H

°

C

H

AM

PM

72

COOL OFF HEAT AUTO

Daily
Programs

■ Press to display M – F programs.

NOTE: Time and Temperature display will be blank when at least one
weekday program is different.

■ Press repeatedly to cycle through the 4 programs.

PROG

PROG

■ Press to change to Sa – Su. Again, if the display is blank, one of the
weekend programs is different.

■ Press again to change to Monday’s program.

■ Continue pressing to cycle through each day.

■ Current time and temperature.

■ Thermostat is set to AUTO, and the heating system is on.

■ Press for 1 second or less.

■ Set Temperature is shown above current room temperature.

■ If held for over 1 second, Temporary Manual Override mode is entered.

Refer to the next page.

PROG

DAY

NOTE: Programs take affect as soon as the thermostat returns to normal mode.

If you are armchair programming the thermostat, slide the system selector to the OFF position before mounting the
thermostat to the wallplate.

MTWThFSa Su

AUTO COOL HEAT

TEMP

85:30

SET TEMP

1234

°

C

H

°

C

H

AM
PM

79

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

8 5:30

SET TEMP

1 234

°

C

H

°

C

H

AM

PM

79

MTWThFSa Su

AUTO COOL HEAT

TEMP

8 9:15

SET TEMP

123 4

°

C

H

°

C

H

AM

PM

68

MTWThFSaSu

AUTO COOL HEAT

TEMP

85:70

SET TEMP

123 4

°

C

H

°

C

H

AM
PM

68

Reviewing the Current Temperature Setting

or

■ Press to return to normal mode.

■ After 15 seconds, the thermostat will return to normal mode automatically.

RETURN

The System Selector switch on the front of the thermostat determines the operating mode of the thermostat.
You may select COOL, OFF, HEAT, AUTO. In order to take full advantage of this thermostat’s features, we
recommend using the AUTO mode. Refer to the Auto Season Changeover information on page 26.

NOTE: Anytime you install or remove the thermostat from the wallplate, slide the System Selector to
the OFF position to prevent the possibility of a rapid system On-Off.

At the next program change, the Temporary Override is canceled, and the next program temperature becomes the setpoint temperature.

72

.

7I

.

70

.

24-25

OPERATION

System Selector Switch

Fan Switch

MTWThFSaSu

AUTO COOL HEAT

TEMP

86:78

SET TEMP

1 234

°

C

H

°

C

H

AM
PM

73

The Fan switch should normally be set in the AUTO position. The Fan will be turned on along with normal
operation of your system. In a normal gas or oil furnace, the Fan will be turned on by your furnace after its warm­up delay. For electric heat, air conditioning, and heat pump operation, the Fan will turn on with the system.

To run the Fan continuously, slide the Fan switch to the ON position.

Temporary Manual Override

To temporarily change the current set temperature without affecting your program:

■ Press to return to normal mode, or wait 15 seconds for it to return
automatically.

■ The current program number will flash to signify the Temporary Override.

RETURN

ON AUTO

COOL OFF HEAT AUTO

Press and to change to your desired new temperature.

Press and hold or for about 1 second to enter Manual Override mode.

Display will flash.

To end the Temporary Manual Override:

NOTE: The Auto Season Changeover feature will not operate while the thermostat is in Temporary Manual
Override. Refer to the Auto Season Changeover feature on page 26 for more information.

NOTE: If the thermostat has not been programmed, then a Temporary Override becomes a Permanent Override.
See the next section for more information.

Permanent Manual (Vacation) Override

■ Press and wait for HOLD to display on the LCD.

■ Press again. This will return the set temperature to the current program

set temperature.

HOLD

CLEAR

HOLD

CLEAR

NOTE: The Auto Season Changeover feature will not operate while the thermostat is in Permanent Manual
Override. Refer to the Auto Season Changeover feature on page 26 for more information.

■ Press again. The thermostat will return to the current program, and the
flashing HOLD display will be canceled.

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

HO:LD

SET TEMP

1234

°

C

H

°

C

H

AM
PM

73

HOLD

CLEAR

To hold your manual override for vacation or just an extended period of time:

■ Press to make the current program’s temperature the HOLD
temperature. HOLD will alternate on the display with the normal time
and temperature display.

■ Follow the Temporary Override Instructions above to change the
Permanent Override temperature.

To end the Permanent Manual Override:

■ You can confirm the held set temperature by pressing either
or for less than 1 second.

When the System Selector is in AUTO position, the thermostat
will automatically change between Heating and Cooling systems,
depending on your program. We recommend keeping your
programmed heating and cooling temperatures at least 4°F (2°C)
apart to allow the Auto Season Changeover to occur when the
appropriate temperature span has been reached. However, if
your heating and cooling programs set temperatures are close,
there is a built-in program to prevent the thermostat from
changing unnecessarily.

Auto Season Changeover is disabled when the thermostat is in
Temporary or Permanent Override, as these overrides are energy

saving settings. Auto Season Changeover will still function in
Home Today mode, as this is a comfort setting.

For example, you may have the following temperatures
programmed at a given time:

Heat Set Temp = 68°F
Cool Set Temp = 78°F

If the room remperature rises above 78°F, then the thermostat
will automatically

change to cool mode and turn on the air

conditioner.
Likewise, the thermostat will automatically

change to heat mode

and turn on heat when the room temperature falls below 68°F.

72

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7I

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70

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26-27

OPERATION

Auto Season Changeover

Home Today

This CTC patent pending feature allows you to quickly and temporarily override your energy saving program setting on days when
you are normally away from home with one key press.

HOME
TODAY

■ Press to enter the Home Today override. The highest program
temperature for today will be selected from your programs in Heat mode
and become the set temperature. (In Cool mode, Home Today will select
the lowest program temperature for today to be the set temperature.)

■ The display will alternate between “HOME” and the current time.

■ When pressed during the first or second program of the day, Home

Today will automatically return to program control at the start of the fourth program of the day. If Home
Today is pressed after the start of the third program time of the day, the thermostat will remain in Home
Today mode until the first program of the next day.

MTWThFSaSu

AUTO COOL HEAT

TEMP

HO:ME

SET TEMP

1234

°

C

H

°

C

H

AM
PM

73

■ Press to exit Home Today mode before the schedule ending time.
“HOME” is no longer displayed on the LCD screen, and the
thermostat returns to the current program.

HOLD

CLEAR

HOME

TODAY

HOME

TODAY

■ If Home Today is already active, you may similarly extend it to the first
program of the next day by pressing the key again after the start time
of the third program.

■ If the system is changed between Heat and Cool modes (either
manually or by Auto Season Changeover) during the “Home Today”
override period, the setpoint temperature will be automatically
updated. It will automatically change from the highest heat program
setpoint to the lowest cool program setpoint, or from the lowest cool
program setpoint to the highest heat program setpoint.

■ You can manually change the setpoint temperature while in Home Today

mode. Refer to the Temporary Manual Override instructions on page 24.
Manually changing the set temperature while in Home Today mode will
not affect the Home Today ending time. However, the set temperature will

not change automatically with a manual or Automatic change between
heating and cooling.

■ You may also press the Home Today key while in Temporary Manual
Override. The operation is the same as the previous point above.

NOTE: The Home Today feature does not operate if the thermostat
is not programmed by Auto or Manual programming.

72

.

7I

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70

.

28-29

OPERATION

Energy Monitor

ENERGY

ENERGY

■ Press and hold for 3 seconds to reset the Energy Monitor’s counters.
The display will blink, and all counters will be cleared to zero.

NOTE: Clearing the Energy Monitor counter will also clear the Filter Monitor counter, as Filter usage
and Total Energy usage are the same. Also, clearing the Filter Monitor counter will clear ALL Energy
Monitor counters as well.

The Energy monitor feature measures and stores the amount of
time the heating and air conditioning system operates. Usage
can be displayed for Today (since 12am), Yesterday, This Week
(since Monday), Last Week (last Monday through Sunday), and

Total (up to 999 Hrs. 59 Min.). By monitoring your energy usage,
you see how much the set-back periods are saving and you can
test program adjustment to save even more. Use table on page 18.

■ To review energy usage, press to cycle through Today, Yesterday, This
Week, Last Week, and Total. Press again to return to normal mode, or
wait 15 seconds for the display to return to normal mode. You can also
return to normal mode at any time by pressing RETURN.

■ For example: This LCD display shows Today’s usage to be 10 Hours,
26 minutes.

MTWThFSaSu

Usage Today

TEMP

8 0:10

SET TEMP

1234

°

C

H

°

C

M

AM
PM

26

Your thermostat also keeps a record of the number of hours your filter has been in use. To maximize your system’s performance and energy
efficiency, change or clean your filter regularly.

NOTE: Clearing the Filter Monitor counter will also clear ALL Energy Monitor counters, as Filter usage and Total
Energy usage are the same. Also, clearing the Energy Monitor counters will clear the Filter Monitor counter as well.

■ When the total system run time for heat and cool reaches 500 hours,

“FILT” will alternate with the current time on the LCD display to remind
you to clean or change your system’s filter. “FILT” will continue to flash
until the counter is set back to zero.

■ Press to review total filter usage. The display will blink “FILT,” then

show the Filter Monitor counter. After 15 seconds, the display will
return to normal mode, or you can hit RETURN to exit immediately.
The Filter Monitor will display up to 999 hours and 59 minutes of usage.

In this example, the counter is at 410 Hours, 26 minutes.

■ To reset the Filter Monitor counter, depress FILTER for 3 seconds.

The display will blink, and the counter will be reset to zero.

FILTER

Filter Monitor

MTWThFSaSu

AUTO COOL HEAT

TEMP

8 4:10

SET TEMP

1234

°

C

H

°

C

M

AM
PM

26

MTWThFSaSu

AUTO COOL HEAT

TEMP

FI:LT

SET TEMP

1234

°

C

H

°

C

H

AM
PM

70

72

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70

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30-31

OPERATION

Auto Recovery

CTC’s Auto Recovery feature meets the E

NERGYSTAR

®

guidelines
for energy efficiency by allowing the heating or cooling system to
recover gradually from an energy-saving setpoint temperature to a
comfort setpoint temperature.

Auto Recovery calculates how early to turn your system back On,
so that the room temperature is already comfortable by the start
of the comfort temperature program period. Auto Recovery works
in both Heat and Cool modes.

For example, in Heat mode, you could have the following
programs:

Program #4 (Overnight) Program #1 (Morning)
Set Temp = 60°F Set Temp = 68°F
Time = 10pm Time = 6am

The room temperature fell to 60°F overnight. Rather than having
the thermostat turning on at 6am, Auto Recovery would note
the temperature difference between 60°F and 68°F and turn the
Heat on approximately 30 minutes early. Therefore, the room
temperature at 6am would be about 68°F instead of 60°F.

■ When the thermostat is in

Auto Recovery mode, the
display will alternate “RECV”
with time, and the program
indicator will flash.

Details of Auto Recovery Operation:

■ Auto Recovery can be disabled by sliding the Recovery switch
on the circuit board to the ALT position. Refer to page 15.

■ Auto Recovery will not operate if Permanent hold, Temporary
hold or Home Today is in operation.

■ Auto Recovery can be canceled manually if HOLD/CLEAR is
pressed during the recovery process. If a recovery process is
canceled manually then the recovery process will not start
again until the next program period starts (an exception is
that if time or program is changed then the thermostat will
check Auto Recovery conditions immediately).

■ Auto Recovery will be canceled and change to Home
Today mode if HOME TODAY is pressed during the
recovery process.

■ Auto Recovery will be canceled and change to Temporary
Manual Override mode if the setpoint is adjusted during the
recovery process.

■ If the system changes between heat and cool (automatically
or manually) then the thermostat will recalculate Auto
Recovery again. Setpoint temperature will be changed to the
opposite system’s comfort temperature if the recovery entry
criteria are still met. Otherwise, the recovery process will be
canceled and return to program control mode.

MTWThFSaSu

AUTO COOL HEAT

TEMP

RE:CV

SET TEMP

1 2 34

°

C

H

°

C

H

AM
PM

74

Backlighting (INDIGLO®night-light)

■ Press the Light Bar on the left side of the thermostat to illuminate the
display.

■ The display will remain illuminated for 5 seconds after the last key is
pressed.

This allows the light to stay on if you need to operate several keys.

Note: If the thermostat is in Low Battery warning condition, the backlight will not operate. Replace
with 2 new AA alkaline batteries to restore the Backlight function.

Your thermostat has an electroluminescent lamp that backlights the display for easy viewing in the dark.

Keyboard Lock

■ All keys are locked, except for the LIGHT bar. Any time a key is
pressed, LOCK will appear on the display for 1 second.

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

LO:CK

SET TEMP

1 2 34

°

C

H

°

C

H

AM

PM

74

The Keyboard can be locked to prevent unauthorized changes to the thermostat.

■ To lock or unlock the keyboard, press and hold BOTH the

and keys for 3 seconds. The keyboard is locked

when LOCK appears on the display.

When the batteries become too weak for normal operation, the
thermostat enters the second stage low battery warning which
shuts down the thermostat. In this condition, “BATT” flashes

alone on the display, and the thermostat will turn your system
Off. Your system will remain shut-off until the batteries are
replaced.

NOTE: The thermostat will still keep the current time and your programs in memory until new batteries are installed. After
confirming new batteries have been inserted, the thermostat will return to normal operation.

NOTE: The backlight will not operate in low battery condition. Replace with 2 new AA alkaline batteries to restore the
Backlight function.

32-33

SAFETY FEATURES

Low Battery Warning

Your thermostat has a two-stage low battery warning system.
When the batteries are first detected to be weak, the first stage
low battery warning is indicated by “BATT” flashing on the LCD

display alternatively with the clock. You then need to replace the
batteries with 2 new AA alkaline batteries.

M T W Th F Sa Su

AUTO COOL HEAT

TEMP

BA:TT

SET TEMP

1 2 34

°

C

H

°

C

H

AM
PM

74

BA:TT

If the thermostat is unable to control your system due to an
unexpected battery problem, the thermostat will enter Error
Mode. In this condition, the thermostat flashes “ERR-” on the
LCD display, and shuts off your system.

To correct this problem, replace the batteries with 2 new AA
alkaline batteries, even if you have recently replaced them. Next,

use a paper clip to press the RESET button next to the keypad.
You will need to reprogram your thermostat and confirm normal
operation.

If Error Mode returns, please call CTC Technical support at
1-800-676-7861 from 8AM to 5PM Central Standard time.

Your thermostat will automatically cut-off in Heat mode if the
room temperature rises above 95°F (35°C). It will cut-off in Cool
mode if the room temperature drops below 40°F (4°C).

NOTE: If your system has malfunctioned and no longer
responds to thermostat controls, the Auto Cut-Off will have
no effect.

Error Mode

Auto Cut-Off

ERR--

34-35

TROUBLESHOOTING

Problem Solution

SCRAMBLED OR DOUBLE DISPLAY
(numbers over numbers)

NO DISPLAY

ENTIRE DISPLAY DIMS
PROGRAM DOES NOT CHANGE AT YOUR

DESIRED SETTING

AUTO / FAN DOES NOT TURN ON
HEATING OR COOLING DOES NOT GO ON OR OFF

1. Remove clear mylar sticker

1. Check battery connections and batteries.

2. Press RESET button with a small pin and hold in for two seconds.

1. Replace Batteries

1. Check that the time is set properly to “AM” or “PM”.

2. Check that the thermostat is not in “HOLD” or “Home Today” modes.

3. Check for the correct day setting.

1. Move HG/HE selector to opposite position

1. Check that the system selector switch is in the correct position (“HEAT,”
“COOL” or “AUTO”).

2. The thermostat may be in the AUTO mode. Look for “AUTO” on the LCD
display. If the Heat and Cool program temperatures are close, then the
thermostat requires a larger room temperature change before changing
from Heat or Cool.

3. There may be as much as a 4 minute delay before the Heat or Cool
system turns On – wait and check. (Compressor protection delay.)

4. Check your circuit breakers and switches to ensure there is power to the
system.

5. Replace batteries.

6. Make sure your furnace blower door is closed properly.

7. If your system only uses 4-wires, be sure the jumper wire is installed
between the RC and RH terminals.

8. Check the position of the Furnace or Heat Pump selector switch: Normal / O / B.

Solution (cont.)

ERRATIC DISPLAY

IF UNIT CONTINUES TO OPERATE IN THE OFF POSITION
THERMOSTAT PERMANENTLY READS “HI,” “LO,”

OR “ERR-” AFTER PRESSING RESET BUTTON

1. Press the RESET button once with a small pin and hold for two seconds.
The thermostat will need to be re-programmed.

1. Replace unit.

1. Replace unit.

If you experience any other problems, call [phone] from 9AM to 5 PM EST for technical assistance.

Problem (cont.)

Smart Temp Australia Pty Ltd
19 Indra Road Blackburn South Victoria 3130 Australia
Tel [phone] Fax [phone] 
www.smart-temp.com.au

36-37

WIRING DIAGRAMS

5-wire Heat/Cool System

X - No Connection

THERMOSTAT

G

W

Y

RHRC

Heat Relay
or Valve

Heat
24V Supply

Fan
Relay

Cool
Contactor

Cool
24V Supply

THERMOSTAT

G

W

Y

RHRC

Heat/Cool
24V Supply

Fan
Relay

Heat Relay
or Valve

Cool
Contactor

Jumper

4-wire Heat/Cool System

X

O/B

X

O/B

Single-stage Heat Pump

THERMOSTAT

G

W

Y

O/B

RHRC

Heat Pump
24V Supply

Fan
Relay

Compressor
Contactor

Reversing
Valve

Jumper

X - No Connection

O/B

2-wire Heat Only

THERMOSTAT

G

W

Y

RHRC

Heat Relay
or Valve

Heat
24V Supply

XXXX

X

3-wire Cool Only

3-wire Heat Only

THERMOSTAT

W

RHRC

Heat Relay
or Valve

Heat
24V Supply

Fan
Relay

THERMOSTAT

G

W

Y

RHRC

Cool
Contactor

Fan
Relay

Cool
24V Supply

G Y

O/B

O/B

38-39

WIRING DIAGRAMS

X - No Connection

X

X

X

X X X

Jumper