Comfort Stat CP1818 User Manual

Digital Thermostat

y

y

r

Owners Manual

Model:CP1818

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:

y Gas – Standing Pilot y Oil – Fired Furnace
y Gas – Electronic Ignition
y Gas – Fired Boilers
y Gas – Millivolt Systems y Electric Furnace
y Oil – Fired Boilers y 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 95˚F (7˚C and 35˚C).
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).

This thermostat will automatically cutoff in Heat mode if the temperature
rises above 95˚F (35˚C), and automatically cutoff in Cool mode if the
temperature drops below 45˚F (7˚C).

3. Compressor Protection

This thermostat provides a 4 minute del ay afte r shutti ng 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 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 approx imately 1 minute to chan ge the batter ies
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 VAC and with batteries as backup.

FEATURES

Structure of thermostat and explanation for the keypads

Filt

er Change

Ind

icator:Flashes

wh

en filter needs

to

be checked.

LCD Display:
Shows Room
Temperature,Set
Temperature,and
other feature
information as
required.

System
Switch:
Selector
switch for
Heat,Cool,
and Off.

an Switch:

F

an switch

F

r Automatic

fo

ontinuous

or C

an operation.

f

y Single Stage Heat Pumps – with no

auxiliary heat

Light:Backlight
display

automatically
with each key
press for easy
viewing.

Low Battery
Indicator:
Flashes when
batteries need
to be replaced.

SYSTEM

ON

HEAT

COOL

OFF

Front Door:
Battery cover
Open with one
finger from top.

FAN

AUTO

Battery
Compartment:
Front access allows
easy insertion of
two AA 1.5V
batteries.

Front Door:
Cover keys Open with
one finger from left or right.

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.

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

system

cool

heat

off

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.

The System Selector switch on the front of the
thermostat determines the operating mode of the
thermostat. You may select COOL, OFF, HEAT.

Fan Switch

fan

auto

on

warm-up delay. For electric heat, air conditionin g, an d hea t pump oper ati on,
the Fan will turn on with the system.

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

The Fan switch should normally be locate d in the A UT O
position. The Fan will be turned on along with normal
operation of your system. In a norm al gas or oil furn ace,
the Fan will be turned on by your furnace after its

Review Current Set Temperature

y Press either the up or down key once to see the Set Temperature.
The factory default is 68˚F (20˚C) when started with the System Switch Off

or Heat, and 78˚F (26˚C) when started with the System Switch on Cool.

Setting New Temperature

y Press either the up or down once and
display the set temperature.

y 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.

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 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 Indicat or to appear on the LCD. This is only to confirm
key operation, and the counte r 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 (1˚C) above and below
the set temperature. (Span = 2) This setting has been designed to provid e
a comfortable room temperature under most all conditions. However, if you
find your system cycling t oo f ast or t oo slow, then the Span can be adju sted
to modify the cycle time.

y Press and hold BOTH up and down keys for three

seconds. SPAN will be displayed on the LCD.

y Press up to raise the Span to 3. This setting

INCREASES to cycle time by allowing your system
to run LONGER.

y 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 Switc h position.

When batteries are installed in the thermostat, the Span is reset back to
setting 2.

Backlighting

Your thermostat has an electroluminesc en t 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 bat teries 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. 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 Mode

If the thermostat is unable to control your system due to an unexpected
battery problem, the thermostat will enter
Error Mode. In this condi tion, the thermostat
flashes “E1”or “E2” on the LCD display, and
shuts off your system.

To correct this problem, rep lace the batteries
with 2 new AA alkaline batteries, even if you
have recently replaced them. Next, Move the
battery out hold any key then pla ce the bat tery
again. You will need to reprogram your
thermostat and confirm normal operation. If
Error Mode returns, please call us for further
information.

Lcd displa

E1 Sensor Erro

information Lcd displa

E2 System switch

information

Auto Cut Off

Your thermostat will automatically cutoff in Heat mode if the room
temperature rises above 95˚F (35˚C). It will cutoff in Cool mode if the room
temperature drops below 45˚F (7˚C).

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.

y Slotted Screwdriver(s)
y Small Philips screwdriver
y Hammer
y Electric drill and 3/16” bit
y Two 1.5V (AA) size alkaline batteries (included)

Remove Old Thermostat

CAUTION: Do not remove any wiring from existing thermosta t 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 wallplat e. Ag ain, look for scr ews, t abs,
etc. Some models have doors that open to expose wires and mounting
screws. See Figure 1.

Typical Home Thermostats

Wall mounting Plate Thermostat Cover

Wall mounting Plate Thermostat Cover

Figure 1

Wiring Labeling

y Each wire coming from the wa ll to the existing thermostat is c onnected 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.
y 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 th e terminals. Use the termin als 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 in between. If you follow the
labeling procedures correctly, you do not have to be concerned about how
many wires there are.
y There is often no term
heat only systems. Just connect eith er of t he wi res to the R H t erminal , t hen
connect the other wire to the W terminal to complete the circuit.
y IMPORTANT! BEFORE DISCONNECTING ANY WIRES, AP
SELFADHESIVE LABELS PROVIDED TO THE WIRE AS SHOWN IN
TAB LE A BELOW. (For example, attach the label marked W to the w ire t hat
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.

y After labe
y Remove existing wallplate. To make sure wires do not fall back into

opening, you may want to tape them to the wall.
y If hole in wall is larger than necessary for wi
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.

ling wires, disconnect them from the existing thermostat.

If the code letter on then e wire and connect to

your existing

Thermostat is

inal marking on the existing thermostat of two wire,

PLY THE

wall

res, seal this hole with

Table A

mark th

with label shown ermostat termina

th l

shown

L

N

N Do not connect a “Common” wire (sometimes

OTE:

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.

ount wallplate and Thermostat

M

y Remove the wallplate from your thermost

on the bottom of the thermostat. See Figure 2.

at by pressing the release tab

Figure 2

y Position wallplate on wall and g 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.

y ntil flush

Drill holes with 3/16” bit and gently tap anchors into the holes u

with wall.

y wallplate to wall, pulling wire s through large opening. Insert

Reposition

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

pull existin

NOTE: 5- Wire Systems

If your thermostat has one wire marked R or Rh (2, 3, or 4-wire system),

N

Y

W

R

c

/

B

L

R

h

/

O

G

Figur

R

e 3

then leave the jumper w
wallplate. Otherwise, if you hav e s ep ar ate Rh and Rc w ires ( 5-w ire sy stem),
then remove the jumper wire between the Rh and Rc terminals.

ire between the Rh and Rc terminals on the

Connect Wires and Mount Thermostat to wallplate

y Match and connect the labeled wires to the appropriate coded terminal

screws on the wallplate. (See Figure 4, 5.) Ignore any wires wh
be present, but which were note connected to the old thermostat.

Rh

AC24V

NL

RGW

Y

Figure 4 Figure 5

efer to the Wiring Diagrams below to be sure your system is wired

y R

rrectly.

co
y If your system is a single stage heat pump and uses an O or B wire, you
must move
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 cause operational problems with your sy
y Push excess wire 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.
yInsert the tabs on top of t he thermostat body into the slots at the top of the
wallplate
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.)
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.

Wiring Diagrams

the System Selector switch inside the thermostat to the Heat

stem or thermostat.

. Press the bottom of the thermostat body into the snap on the

AC24V

NL

120V
AC

AC24V

NL

120V
AC

AC24V

NL

120V
AC

AC24V

L

N

120V
AC

AC24V

L

N

120V
AC

AC24V

L

N

120V
AC

ich may

X-No Connection

Selector Switches

In order for this thermost a t to c ontrol your system, the system ty pe must be
specified by the selec
thermostat. There is also a selector switch for your choice of Fahrenheit or
Celsius temperature display. See figure 6.
y Heating System Selector (HG – HE switch)
The factory position for this switch is in the
position if you have a gas furnace or an oil bu
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 a nd most ot her systems. “HE” position is for
certain electric systems having a
y System Selector (STANDARD – HEAT PUMP switch)
The factory position for this switch is in the STD po
position if you have ANY system tha t uses gas, oil, elec
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 (Rc/O) or
(Rh/B).
y F˚ / C˚ selector (Fahrenheit / Celsius)

rmostat is set for F˚ mode from the factory. In order to change to C˚

Y our the
mode, slide the switch to C˚ and hold any
battery, then place the battery again.
NOTE: Unless press any key about 2 seconds without the battery, then
place the battery again.

tor switches on the printed ci rcuit board inside the

“HG” position. Leave it in this

rner. If you have an electric

fan relay.

sition. Leave it in this

tric, or hot water

key about 2 seconds wit h out th e

JP2

C

F

1234

K3

HE

HP

K5

STD

HG

Figure 6

TROUBLESHOO

Problem Solution

Entire Display
Dims.

Auto Fan Does Not
Turn On Properly.

Heating or Cooling
Does Not Go On or
Off.

Erratic Display 1.

If unit continues to
operate in the Off
position.
Thermostat
permanently reads
“HI”, “LO”,

“E1” , “E2”.

If her problems, call us for technical assistance.

you experience any ot

T number is 1-866-591-9898

he service

or

TING

1. Check battery connections and batteries. No Display

2. Move the battery out and wait for about 1
minutes then Replace Batteries..

1. Replace Batteries.

or to correct position. 1. Move HG/HE select

1. Check that the function switch is in the correct
position (“HEAT” or “COOL”).

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. Ma closed ke sure your furnace blo wer door is

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/O terminals.

7. . Check the position of the Reversing Valve

selector switch: Standard or Heat Pump

8. If you have single-stage hea t pump, be sure

the jumper wire is installed between t he Y a
W terminals.

Move the battery out hold any key then place

the battery agai

1. Replace unit.

1. Replace unit.

n. Then reprogram.

nd