Comfort Stat CP1819, Owner'S Manual, Page: 2 / 2

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.
Ÿ
F˚ / C˚ selector (Fahrenheit / Celsius)
Your thermostat is set for F˚ mode from the factory. In order to change to C˚ mode,
slide the switch to C˚ and Move the battery out and wait for about 1 minute then place
the batteries ..
NOTE: Unless press any key about 2 seconds without the battery, then place the
battery again. the thermostat will not change temperature mode. All programs and
settings will be lost .
Ÿ Heating System Selector (HG – HE switch)
The factory position for this switch is in the “HG” position. Leave 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.
Ÿ 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
single­stage 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 (Y/O) or (W/B).
Ÿ Auto Recovery selector (DISABLE/ENABLE)
Your thermostat is set from the factory with the Auto Recovery Feature enabled, which
complies with the EPA ENERGY STAR Program. IF you prefer to use normal recovery,
slide the switch to the DISABLE position.
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.
Ÿ Slotted Screwdriver(s)
Ÿ Small Philips screwdriver
Ÿ Hammer..
Ÿ Electric drill and 3/16” bit
Ÿ 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. See Figure 1. 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 wall plate. 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
Ÿ
Each wire coming from the wall to the existing thermostat is connected to terminal
point on that thermostat. Each of these terminal points is usually marked with a code
letter as shown in Table A below.
Ÿ
Note that this thermostat has multiple function terminals that allow Single­Stage Heat
Pump capability. Standard systems use: Rh, Rc, G, Y, W. [Single­Stage 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.
Ÿ
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.
Ÿ
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.
Ÿ 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.
Ÿ After labeling wires, disconnect them from the existing thermostat.
Ÿ Remove existing wall plate. To make sure wires do not fall back into wall opening, you
may want to tape them to the wall.
Ÿ 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.
Table A
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
non­battery powered thermostats.
Mount Wall plate and Thermostat
Ÿ
Remove the wall plate from your thermostat by pressing the release tab on the
bottom of the thermostat. See Figure 2.
Figure 2.
Ÿ
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 wall plate.
Ÿ
Drill holes with 3/16” bit and gently tap anchors into the boles until flush with wall.
Ÿ
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 4­wire system), then leave the
jumper wire between the Rh and Rc terminals on the wall plate. Otherwise, if you have
separate Rh and Rc wires (5­wire system), then remove the jumper wire between the
Rh and Rc terminals.
Connect Wires and Mount Thermostat to Wallplate
Ÿ
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.
Ÿ Refer to the Wiring Diagrams below to be sure your system is wired correctly.
Ÿ
If your system is a single stage heat pump and uses an O 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.
Ÿ Be sure to tighten the terminal screws securely, otherwise a loose wire could cause
operational problems with your system or thermostat.
Ÿ Push excess wires back into the hole to prevent interference when installing the
thermostat to the wallplate.
Ÿ Make sure the System Switch is set to OFF, and the Fan Switch is set to AUTO.
Ÿ Insert the bottom tabs on the thermostat body into the slots at the bottom of the
wallplate. Press the top of the thermostat body to snap it into the wallplate. Refer to
Figure 6.
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.
Ÿ Insert the two AA size alkaline batteries, observing the polarity marked inside the
battery compartment.
Ÿ Switch on the main power at the panel or furnace.
Figure 4 Figure5
Figure6
Wiring Diagrams
TROUBLESHOOTING
Problem Solution
1. Check battery connections and
batteries.
No Display
2. Move the battery out and wait for
about 1 minute
Entire Display Dims. 1. Replace Batteries.
Auto Fan Does Not Turn On
Properly.
1. Move HG/HE selector to correct
position.
1. Check that the function switch is in
the correct position (“HEAT” or
“COOL”).
2. There may be as much as 4­mintue
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 non­heat pump system only
uses 4­wires, be sure the jumper
wire is installed between the Rh/B
and Rc /O terminals.
7. Check the position of the
Reversing Valve selector switch:
Standard or Heat Pump.
Heating or Cooling Does Not Go
On or Off.
8. If you have single­stage heat
pump, be sure the jumper wire 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 operate in the
Off position.
1. Replace unit.
Thermostat permanently reads
“HI”, “LO”, or “E1”, “ E2 ” ..
1. Replace unit.
If you experience any other problems, call us for technical assistance.
The service number is 1­866­591­9898
W
G
Y
RH
RC
Wall mounting Plate Thermostat Cover
Wall mounting Plate Thermostat Cover
1
2
3
4
R ECOVER Y EN ABLE D ISABLE
S TD HP
HG HE
K 6
JP1
K5
CEN TI GRAD E F AH REN HEIT
Y1
Y1
RH
RC
G
Y /O
W /B
Y1
AC24V
AC24V
N
L
N
L
Y/O
Rh
Rc
G
L
N
Y1
W/B
RH
G Rc Rh Y/O W/B Y1
Wallplate
Terminals Jumper
Fan
Relay
Cool
Contactor Heat Relay
or Valve
System
Selector STD
HP
Fan
Relay
Compressor
Contactor Reversing
Valve
Wallplate
Terminals
System
Selector
HP
STD
Wallplate
Terminals
No
Jumper
System
Selector
HP
STD
Jumper
Heat
Mode Cool
Mode OR
Heat 24V or
Millivolt Supply Heat Relay
or Valve
Wallplate
Terminals Jumper
System
Selector
HP
STD
Wallplate
Terminals System
Selector
Heat Relay
or Valve
Jumper
HP
STD
Fan
Relay
Fan
Relay
Wallplate
Terminals
Cool
Contactor
System
Selector
HP
STD Jumper
4­Wire Heat/Cool System
5­Wire Heat/Cool System
Single­Stage Heat Pump System
2­Wire Heat Only System
3­Wire Heat Only System
3­Wire Cool Only System
G Rc Rh
Y/O W/B Y1
Fan
Relay
Heat
24V
Supply Cool
Contactor Heat
Relay
or Valve
G
Rc Rh Y/O
W/B
Y1
G Rc Rh
Y/O
W/B Y1
G Rc Rh Y/O W/B Y1
G Rc Rh
Y/O
W/B Y1
120V
AC
120V
AC
120V
AC
120V
AC
120V
AC
120V
AC
N L
AC24V
N L
AC24V
N L
AC24V
N
L
AC24V
N L
AC24V
N L
AC24V