Comfort Stat CP1719 User Manual

Page 2

Mechanical Heat Backup

This thermostat includes a bimetal switch that will automatically turn on the Heat when

the temperature reaches about 41˚F (5˚C).
WARNING: This switch only activates the Heating terminal (W). The system itself
must be capable of automatically turning the Fan On. Without normal Fan
operation, severe damage to the heating system could result.

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.

y 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

ce or an oil burner. If you have an electric furnace, test to see whether

ating, change the switch position to “HE”. The system selector

or emergency heat source), then slide the switch

STALLA

settings will be lost .

y 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 furna

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 he

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.

y 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

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).

y 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.

TION

hat You Need

his thermostat includes two #8 slotted screws and two wall anchors for mounting. To

stall your thermostat, you should have the following tools and materials.

ed Screwdriver(s)

y Small Philips screwdriver

3/16” bit

in
y Slott

y Hammer..
y Electric drill and
yTwo 1.5V (AA) size alkaline batteries (included)

Remove Old Thermostat

e any wiring from existing thermostat before reading the

s must be labeled prior to removal.

! Turn off the power to the furnace at the main power panel or at the

e 1. Some thermostats

etc. Some models

CAUTION: Do not remov

instructions carefully. Wire

INPORTANT

furnace.

Remove existing thermostat cover and thermostat. See Figur

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,

have doors that open to expose wires and mounting screws. See Figure 1.

Typical Home Thermostats

Figure 1

Wiring Labeling

h wire coming from the wall to the existing thermostat is connected to terminal

int on that thermostat. Each of these terminal points is usually marked with a code

shown in Table A below.

y Note that this thermostat h

function terminals that allow Single-Stage Heat

Pump capability. Standard s

ems use: Rh, Rc, G, Y, W. [Single-Stage Heat Pumps

in between. If you follow the labeling procedures

al, then

y Eac

letter as

as multiple

yst

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.
y The number of wires in your system can be as few as two (for heat only systems), as

many as eight, or any number

correctly, you do not have to be concerned about how many wires there are.
y 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 termin

connect the other wire to the W terminal to

complete the circuit.

y IMPORTANT! BEFORE DISCONNECTING ANY

WIRES, APPLY THE SELF-ADHESIVE 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 y

HE COLOR OF THE WIRES since these do not always comply with the standard.

ing thermostat.

not fall back into wall opening, you

al this hole with insulating material

ark the wire with

and connect to

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.

Mount Wall plate and Thermostat

our existing thermostat.) IGNORE

y After labeling wires, disconnect them from the exist
y Remove existing wall plate. To make sure wires do

may want to tape them to the wall.
y If hole in wall is larger than necessary for wires, se

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

then m

existing

Thermostat is

label shown

thermostat terminal

shown

y Remove the wall plate from your thermostat by pressing the release tab on the

Position wallplate on wall and pull existing wires through large opening. Then level

earance. Mark holes for plastic anchors provided, if your existing holes do not

line up with those on the wall plate.
y Drill holes with 3/16” bit and gently tap a

ors into the boles until flush with wall.

y Reposition wallplate to wall, pullin

gh large opening. Insert mounting

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 wall plate. Otherwise, if you have

separate Rh and Rc wires (5-wire system), then remove the jumper wire between the

Rh and Rc terminals.

unt Thermostat to Wallplate

bottom of the thermostat. See Figure 2.

Figure 2.

for app

nch

g wires throu

screws provided into wall anchor and tighten. See Figure 3.

Connect Wires and Mo

Figure 4 Figu

iring Diagrams

y 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.
y Refer to the Wiring Diagrams below to be sure your system is wired correctly.
y 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.
y Be sure to tighten the terminal screws securely, otherwise a loose wire could cau

operational problems with your system or thermostat.
y Push excess wires back into the hole to prevent interference when installing the

thermostat to the wallplate.
y Make sure the System Switch is set to OFF, and the Fan Switch is set to AUTO.
y 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.
y Insert the two AA size alkaline batteries, observing the polarity marked inside the

battery compartment.
y Switch on the main power at the panel or furnace.

re5

Figure6

TROUBLESHOOTING

Problem Solution

1. Check battery connections and

batteries.

No Display

2. Move the battery out and wait for

about 1 minut

Entire Display Dims.

1. Replace Batteries.

Auto Fan Does Not Turn On

Properly.

G/HE selector to correct

1. Move H

position.

unction switch is in

n (“HEAT” or

Check that the f

the correct positio

“COOL”).

2. There may be as much as 4-mintue

ay.)

delay before the system turns On –

wait and check. (Compressor

protection del

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. I

pump system only

re the jumper

f your non-heat

uses 4-wires, be su

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

-stage heat

On or Off.

If you have single

pump, be sure the jumper wire is

nstalled between the Y and W

erminals.

Erratic Display

1. Move the battery out hold any key

then place the battery again. Then

reprogram.

If unit continues to operate in the

it.

Off position.

Replace un

Thermostat permanently reads

“HI”, “LO”, or “E1”,

“E2”..

1. Replace unit.

r technical assistance.

er is 1-866-591-9898

you experience any other proble

he service numb

ms, call us fo

3
4

RECOVERY ENABLE

DISABLE

System Selector

STD

JP1

Fan Option

CENTIGRADE

FAHRENHEIT

Auto Recovery

Wall mounting Plate Thermostat Cover

Heat Pump compressor

Y/O

W/B

Y/O

J um per

STD

Fan
Relay

Fan
R elay

W allp la te
T erm ina ls

C ool
C ontactor

C ool 24V
S up ply

System
Selector

STD

J um per

4-W ire Heat/Coo l System

5-W ire/Heat Cool System

Single-Stage Heat Pump System

2-W ire Heat Only System

3-W ire Heat Only System

3-W ire Cool O nly System

R h

Y/O

W/B

Fan
Relay

C ool
2 4V S up ply

H eat
2 4V S upply

Cool
C ontactor

H eat Relay

o r Valve

R h

Y/O

W/B

H eat Pump
2 4V S up ply

R h

Y/O

W/B

R h

Y /O

W/B

R h

Y/O

W/B

R h

W allp la te
T erm ina ls

J um per

Y/O

W/B

Fan
R elay

H eat /C ool
2 4V S up ply

Cool
C ontactor

H eat Relay

o r Valve

System
Selector

STD

Fan
Relay

C om pressor
C ontactor

R eversing

Valve

W allp la te
T erm ina ls

System
Selector

STD

W allp la te
T erm ina ls

N o Ju mp er

System
Selector

STD

J um per

H eat
Mode

C ool

M ode

H eat 24 V or
M illivo lt S upply

H eat Relay

o r Valve

W allp la te
T erm ina ls

J um per

System
Selector

STD

W allp la te
T erm ina ls

System
Selector

H eat 24V

Sup ply

H eat R elay

o r Valve

Connect To Proper Reversing
Valve Terminal. See Table A