ControlTemp CT72 User manual

Digital Thermostat
Owners Manual
Modei:CT72
Your new thermostat will provide years of reliable service. Using this
digital thermostat will provide more uniform comfort
in your home through
the seasons. Thank you for buying the product!
Please read this manual for complete instructions on installing
and
operating your thermostat. If you require further assistance, please feel
free to contact
us.
IMPORTANT INFORMATION
1. This thermostat is designed to work on the following systems:
• Gas -Standing Pilot
•
Gas- Electronic Ignition
• Gas -Fired Boilers
•
Gas- Milivolt Systems
•
Oil -Fired Boilers
• Oil -Fired Furnace
• Single Stage Heat Pumps -with no
auxiliary heat
• Electric Furnace
• Electric Air Conditioning
This thermostat will NOT control multistage heat pumps or
11 0/220V
baseboard electric heating systems.
2. Temperature Range
This thermostat can be set between 45"F and
95"F. However, it will display
room temperatures from 30"F to
99"F. "HI" will be displayed if the
temperature
is higher than 99"F, and "LO" will be displayed if the
temperature
is lower than 30"F.
This thermostat will automatically cutoff in Heat mode if the temperature
rises above
72"F, and automatically cutoff in Cool mode if the temperature
drops below
72"F.
3. Compressor Protection
This thermostat provides a 4 minute delay after shutting offthe compressor
before it can be restarted. This feature will prevent damage to your
compressor caused by rapid cycling. It does not prevent a rapid
compressor restart due to short power outages.
4. BatteryWarning
Two fresh AA alkaline batteries should provide well about one year of
service. However, when the batteries become drained the Low Battery
Indicator will flash on the display. When this message occurs, install new
alkaline batteries.
You have approximately 1 minute to change the batteries
and keep the thermostat's 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 flashing Low Battery Indicator on the LCD
display.
CAUTION: When only the battery icon flashes
on the display, 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 backlight 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.
5.Power
supply
The thermostat shall be powered by 24 VAG and with batteries as backup.
FEATURES
Structure of thermostat and explanation for the keypads
light: Backlight displayautomatically
with each key press
for easy viewing.
Filter Change
lndicator:Fiashes--
when filter needs
to be checked.
LCD DiSplay:
Shows Room
Temperature,Set 1
.-----------
Temperature,and .-------------bhh, ~.==~==
other feature -
information as
required.
Front Door:
Low Battery Indicator. Flashes when
batteries need to be replaced.
FilterKey:
Resets
the
filter change
counter to zero.
Up and Down Keys:
Keys for changing
the Temperature
setting. Also used
for adjusting the
Span.
Fan Switch: Fan
-switch for Automatfc
or Continuous fan
operation.
System switch:
selector switch
for
Heat,Cool,and Off.
Cover keys Open with one finger from left or right.
OPERATION
Start-up
The LCD will show the factory default display
of 70"F when batteries are first installed,.
The temperature will update after a few
seconds.
System Selector Switch
TEMP flf
IU
system
CLcl2)
cool off heat
The System Selector switch on the front of the
thermostat determines the operating mode of the
thermostat.
You may select COOL, OFF, HEAT.
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.
Fan Switch
fan
([oJ)
on auto
The Fan switch should normally be located in the AUTO
position. The
Fan will be turned on along with normal
operation
of your system. In a normal gas oroil furnace,
the Fan will
be turned on by your furnace after its
warm-up delay. For electric heat, air conditioning, and heat pump operation,
the Fan will turn on with the system.
To run the Fan on continuously, slide the Fan switch to the ON position.
Review Current Set Temperature
• Press either the up or down key once to see the Set Temperature.
The factory default is 68"F when started with the System Switch Offor Heat,
and 78"F when started with the System Switch on Cool.
Setting New Temperature
• Press either the up or down once and
display the set temperature.
• Press either
up ordown again to change to
your desired Set Temperature. Hold the key
down for over 2 seconds to fast advance the
Set Temperature.
I-
SET 5n
TEMPO u
The display will return to the normal room temperature after the keys have
been released for 5 seconds.
Filter Monitor
The thermostat counts the number of hours
your system's filter has been
in use. To
maximize your system's performance and
energy efficiency, change or clean your filter
regularly. When the total system
run time for
~~-~FILTER
/;11\'-
i TEMP tC
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COOL
heat and cool reaches 400 hours, the Filter Change Indicator will flash as a
reminder to check your system's filter.
After changing or cleaning the system filter, press and hold the Filter key
for 3 seconds. The display will blink,
and the counter will be reset to zero.
Note: Pressing the Filter key at any time for less than 3 seconds will cause
the Filter Change Indicator to appear
on the LCD. This is only to confirm
key operation,
and the counter is not affected unless the key is held for
greater than 3 seconds.
SPAN Setting
Your thermostat is set at the factory to cycle at 2" F above and below the set
temperature. (Span =2) This setting has been designed to provide a
comfortable room temperature under most all conditions. However,
if you
find your system cycling too fast ortoo
slow, then the Span can be adjusted
to modify the cycle time.
~
'\::£}
• Press and hold BOTH up and down keys for three
seconds.
SPAN will be displayed on the LCD.
• Press up to raise the
Span to 3. This setting
INCREASES
to cycle time by allowing your system
to run LONGER.
• Press down to lower the Span to
1. This setting
DECREASES the cycle time by causing your
system to
run SHORTER.
The Span settings remain the same for both HEAT and COOL,
and can be
changed
in any System Switch position.
When batteries are installed
in the thermostat, the Span is reset back to
setting
2.
Backlighting
Your thermostat has an electroluminescent lamp that backlights the display
for easy viewing in the dark.
When any key is pressed, the display is illuminated.
The display will remain illuminated for 7 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.
Low Battery Warning
Your thermostat has a two-stage lower
battery warning system. When the
batteries are first detected to
be weak, the
first stage low battery warning is indicated
by battery symbol flashing on the LCD
display. At your earliest convenience, you
------~
~~~p6-l~Q~~~
. ....-'//IJ
need to replace the batteries with 2 new AA alkaline batteries. 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, battery symbol 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 Set Temperature and Filter
run time
in memory until new batteries are installed. After confirming that
new batteries have been inserted,
the thermostat will return to normal
operating.
Error Mod~
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 "E1"or "E2" on the
LCD display, and
,shuts off your system.
~·- -1
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Ct
-- j
!To correct this problem, replace the batteries with 2 new AA alkaline
batteries, even if you have recently
replaced them. Next, Move the battery out
hold any key then place the battery again.
You will need to reprogram your thermostat
and confirm normal operation. If Error
Mode returns, please call
us for further
information
Sensor Error
Auto Cut Off
information
Svstem switch Error
Your thermostat will automatically cutoff in Heat mode if the room
temperature rises above
72"F. It will cutoff in Cool mode if the room
temperature drops below
72"F.
:Note that if your system has malfunctioned and no longer responds to
thermostat controls, the Auto Cut-Offwill have no effect.
INSTALLATION
What You Need
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)
• Small Philips screwdriver
• Hammer
• Electric drill and 3/16" bit
•
Two 1.5V (AA) size alkaline batteries (included)
Remove Old Thermostat
CAUTION: Do not remove any wiring from existing thermostat before
reading the instructions carefully. Wires must be labeled prior to
;removal.
INPORTANT! Turn
off the power to the furnace at the main power
panel or at the furnace.
IRemove existing thermostat cover
and thermostat. Some thermostats will
!have screws
or other locking devices that must first be removed. Once the
lwall mounting plate is exposed, look for wires. Ifwires 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.
.Typical Home Thermostats
(f)~~l (0
~
Wall mounting Plate Thermostat Cover
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Wall mounting Plate Thermostat Cover
Figure 1
Wiring Labeling
• 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 latter
as shown in Table A below.
• Note that this thermostat has multiple function terminals that allow
Single-Stage Heat Pump capability. Standard systems use:
Rh, Rc, G, Y, W.
[Single-Stage Heat Pumps use: R, Y, G, and 0 or B.] Table A below shows
;the multiple functions
of the terminals. Use the terminals that match your

system.
• 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 oftwo wire,
heat only systems. Just connect either
of the wires to the RH terminal, then
connect the other wire to
theW terminal to complete the circuit.
• IMPORTANT! BEFORE DISCONNECTING ANY WIRES, APPLY THE
SELFADHESIVE LABELS PROVIDED TO THE WIRE AS SHOWN
IN
TABLE A BELOW. (For example, attach the label marked W to the wire that
toes 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.
• 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 with
insulating material 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.
If the code letter on
your existing
Thermostat is
RH,R.VRor4
•
•
•
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Table A
then mark the wire
with label shown
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(S~I<!_~~" Hea_t""':'P"_ ~-l-~) - -~- ~~
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•
•
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Y,Y1,CorM
AirCoodrtioningCompressor
~~SiagaHealPIJmp ~
Compressor
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1
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•
•
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-batterypowered thermostats.
Mount wallplate and Thermostat
• Remove the wallplate from your thermostat. See Figure 2.
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 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.
Figure 3
NOTE: 5- Wire Systems
If your thermostat has one wire marked R or Rh (2, 3, or 4-wire system),
then leave the jumper wire between the
Rh and Rc terminals on the
wallplate. Otherwise, ifyou have separate
Rh and Rc wires (5-wire system),
then remove the jumper wire between the
Rh and Rc terminals.
Connect Wires and Mount Thermostat to wallplate
• Match and connect the labeled wires to the appropriate coded terminal
screws
on the wallplate. (See Figure 4, 5.) Ignore any wires which may
be present, but which were note connected to the old thermostat.
{[Rhi
Figure 4 Figure 5
• Refer to the Wiring Diagrams below to be sure your system is wired
correctly.
•
If your system is a single stage heat pump and uses an 0 or B wire, you
must move the System Selector switch inside the thermostat to the Heat
Pump position. If you have a normal furnace or electric system, leave the
switch
in the Standard position. Refer to the System Selector section on the
back for more information on this switch.
• Be sure to tighten the terminal screws securely, otherwise a loose wire
could cause operational problems with your system orthermostat.
• Push excess wire back into the hole to prevent interference when
installing the thermostat to the wallplate.
• Make sure the System Switch is set to
OFF, and the Fan Switch is set to
AUTO.
•Insert the tabs
on top of the thermostat body into the slots atthe top ofthe
wallplate. Press the bottom
of the thermostat body into the snap on the
bottom
of the wallplate. Refer to Figure 2. (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
inside the battery compartment.
• Switch on the main power at the panel orfurnace.
Wiring Diagrams
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Tenninals
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w .. a.llplliie
Terminals
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Jumpar
5-Wire HeaVCool System
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1
L<:<>o~_jl~flll'f--J
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~ngle·Stage Heat PUmp System
Jumper -~
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1
Reversing I
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2·\\lire Heat Only systEm
Jumper
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[yaw.T_
3-WireHeatOnlySystem
Jumper
'wa1ipiaie
I Terminals
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3-Wire Cool Only System
systEm I STD
sek>:tor 1
I . HP
systEm
Selector
systEm
Seledor
systEm
Sek>:tor
System
Seledor
systEm
Seledor
STD
HP
STD
HP
STD
HP
STD
HP
STD
HP
X-No Connection
Selector Switches
In order for this thermostat to control your system, the system type must be
specified by the selector switches on the printed circuit board inside the
thermostat. There is also a selector switch for your choice of Fahrenheit or
Celsius temperature display. See figure
6.
• 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 after
installation. If the Fan operation is normal, leave it
in the "HG" position. If
the Fan does not come on within a minute
of the thermostat calling for
heating, 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.
• System Selector
(STANDARD- HEAT PUMP switch)
The factory position for this switch is
in the STD 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
HP position. Be sure the reversing
valve wire is connected to the correct terminal for your heat pump (RciO) or
(Rh/B).
•
'F I ·c selector (Fahrenheit I Celsius)
Your thermostat is setfor
'F mode from the factory. In orderto change to ·c
mode, slide the switch to ·c and hold any key about 2 seconds without the
battery, then place the battery again.
NOTE: Unless press any key about 2 seconds without the battery, then
place the battery again.
0
0
Figure 6
TROUBLESHOOTING
Problem
Solution
No Display
1. Check battery connections and batteries.
2. Move the battery out and wait for about 1
minutes then Replace Batteries
..
Entire Display 1. Replace Batteries.
Dims.
Auto Fan Does Not 1. Move HGIHE selector to correct position.
Turn On Properly.
Heating or Cooling
1. Check that the function switch is in the correct
Does Not Go
On or position ("HEAT" or "COOL").
Off.
2. There may be as much as 4-mintue delay
before the system turns
On -wait and check.
(Compressor protection delay.)
3. Check your circuit breakers and switches to
ensure there is power to the system.
4. Replace batteries.
5. Make sure your furnace blower door is closed
properly.
6. If your non-heat pump system only uses
4-wires, be sure the jumper wire is installed
between the Rh/B and
Rc/0 terminals.
7. Check the position of the Reversing Valve
selector switch: Standard or Heat Pump.
8. If you have single-stage heat pump, be sure
the jumperwire is installed between the Y and
W terminals.
Erratic Display
1. Move the battery out hold any key then place
the battery again. Then reprogram.
If unit continues to
1. Replace unit.
operate
in the Off
position.
Thermostat
1. Replace unit.
permanently reads
"HI", "LO", or
"E1",
"E2". -
!
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