heat
off
cool
on
auto
system
fan
heat
off
cool
on
auto
system
fan
TEMP
SET
TEMP
TEMP
SET
Digital Thermostat
Owners Manual
Model:Chicago Controls HC7445
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
Oil – Fired Furnace
Gas – Electronic Ignition
Gas – Fired Boilers
Single Stage Heat Pumps – with no
auxiliary heat
Gas – Milivolt Systems
Electric Furnace
Oil – Fired Boilers
Electric Air Conditioning
This thermostat will NOT control multistage heat pumps or 110/220V
baseboard electric heating systems.
2. Temperature Range
This thermostat can be set between 45°F and 74°F in heat mode
However, it will display room temperatures from 30°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 30°F (0°C).
3. Compressor Protection
This thermostat provides a 4 minute delay after shutting off the 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. Battery Warning
Two fresh AA alkaline batteries should provide well about two years 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.
NOTE:
The backlight will not function when the thermostat is in low battery
condition.
5.Power supply
The thermostat shall be powered by 24 VAC and with batteries as backup.
FEATURES
Structure of thermostat and explanation for the keypads
OPERATION
Start-up
The LCD will show the factory default display
of 70˚F (21˚C) when batteries are first installed,.
The temperature will update after a few
seconds.
System Selector Switch
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
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 or oil 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 71˚F (22˚C) when started with the System Switch Off
or Heat, and 76˚F (24˚C) 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 or down again to change to
your desired Set Temperature. Hold the key
down for over 2 seconds to fast advance the
Set Temperature.
The display will return to the normal room temperature after the keys have
been released for 5 seconds.
SPAN Setting
Your thermostat is set at the factory to cycle at 2˚F (1˚C) 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 or too 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
need to replace the batteries with 2 new AA alkaline batteries.
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 Mode
If a malfunction occurs, either E1 or E2 will
be displayed.
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.
Lcd display
information
Lcd display
information
E1
Sensor Error
E2
System switch Error
Setting Limits
In the "HEAT" mode your thermostat cannot be set any higher than 74˚F
and In the "COOL" mode your thermostat cannot be set any lower than
45˚F.The display will always display actual ambient temperature.
Note that if your system has malfunctioned and no longer responds to
thermostat controls, the Auto Cut-Off will 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.
Remove existing thermostat cover and thermostat. Some thermostats will
have screws or other locking devices that must first be removed. Once the
wall mounting plate is exposed, look for wires. 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.
Typical Home Thermostats
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 O 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 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
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.
Wall mounting Plate Thermostat Cover
Wall mounting Plate Thermostat Cover
Light: Backlight display automatically
with each key press for easy viewing.
Low Battery Indicator. Flashes when
batteries need to be replaced.
ON
AUTO
FAN
SYSTEM
HEAT
OFF
COOL
Filter Change
Indicator:Flashes
when filter needs
to be checked.
LCD Display:
Shows Room
Temperature,Set
Temperature,and
other feature
information as
required.
Front Door:
Cover keys Open with one finger from left or right.
Fan Switch: Fan
switch for Automatic
or Continuous fan
operation.
System switch:
selector switch for
Heat,Cool,and Off.
Filter Key:
Resets the
filter change
counter to zero.
Up and Down Keys:
Keys for changing
the Temperature
setting. Also used
for adjusting the
Span.
