Emerson P150 User Manual

Single-Stage Thermostat

with scheduling

Install Guide

Model # P150
Made in China

37-7579

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WARNING

!

GUIDE CONTENTS

Preparations ................................................. 3

Thermostat details ........................................ 4

Removal of your old thermostat.................... 5

Mounting and wiring your new thermostat .. 10

Checking thermostat operation................... 12

Programming your thermostat .................... 16

Specications ............................................. 30

Troubleshooting .......................................... 31

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury
and/or property damage.

1. PREPARATIONS

1.1 Check package contents

This package should contain the following items:

• Thermostat

• Mounting screws and wall anchors (x2)

• 2 AAA batteries

• Terminal wire label stickers

• Installation instructions

1.2 Gather tools

Required tools:

□ Flat-head Screwdriver □ Small pliers (needle-nose) □ Drill with 3/16” (4 mm) bit

Optional tools:

□ Wire cutters/stripper □ Hammer

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2. THERMOSTAT DETAILS

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2.1 The thermostat buttons and switches

Raises temperature setting.

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Lowers temperature setting.

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TIME button.

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PRGM (program) button.

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RUN (program) button. Press RUN to

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resume program.

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HOLD button. Press HOLD to bypass the

program. Press RUN to resume program.

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FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

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Time Prgm Run Hold Fan

On Auto Cool Off Heat

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3. REMOVING OLD THERMOSTAT

WARNING

!

3.1 Turn off power

or

To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker box, or by flipping
a switch at the air handler. Do not restore power until installation is complete.

To ensure the power to your heating and cooling system has been turned off, try to turn on heating or cooling by

changing the temperature on your old thermostat.

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3.2 Remove the old thermostat cover

CAUTION

!

Remove the old thermostat’s front cover from the wall base. Some covers pull of easily, while others may need to be
released by using a screwdriver.

Your old thermostat may have a sealed glass tube containing mercury. Be careful not to damage the tube or dispose of the tube in your trash. For safe
disposal information, please see Mercury Notice on page 36.

3.3 Label wires

Tip: Taking a picture with a camera or smartphone can help you not only remember how wires are connected

to the terminals, but can also ensure that you label your wires correctly. Mislabeling the wires may result in a

high energy bill or damage to your heating and cooling system.

Using your screwdriver, carefully unscrew one wire at a time from the terminal block and attach the corresponding

wire label sticker.

Please note that not all terminals may be used, and that there’s no standard color code for thermostat wires, so your
wire colors may vary. For your reference, we’ve included a terminal label reference chart below to help you connect

the wires in your old thermostat to your new thermostat in case you get stuck.

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Terminal labeling reference chart

If your current terminal has

the following letter

Label the wires with the

following letters

Terminal function

RH, R, R5, 5 RH 24V Power (Heating)

RC RC 24V Power (Cooling)

W, W1, 4 W Heating Relay

Y, Y1 Y Cooling Relay

G G Fan Relay

O O

B B

Reversing Valve (for heat pump applications

energized in Cool mode)

Reversing Valve (for heat pump applications

energized in Heat mode)

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3.4 Identify jumper wire

For terminal RC and RH:

On your old thermostat, if… Then, on your new thermostat…

Terminal RC and RH are connected

with a jumper wire

There’s only one R wire (RC, RH, R or R5)

coming out of the wall

Terminal RC and RH (or 5 or R5) are NOT

connected by a jumper wire

Leave the jumper wire in its place

Leave the jumper wire in its place

Remove the jumper wire between RC and RH

For terminal Y and W:

If you have a heat pump with reversing valve, connect Y and W with a jumper wire on your new thermostat.

If you need help with labeling and wiring, please contact Customer Support at 877.654.9394 or email
[e-mail] — we’re here to help!

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3.5 Remove old thermostat base

With all of your wires disconnected and properly labeled, you may now safely remove the thermostat base from
your wall.

Tip: Worried about having your wires falling into your wall? Keep the wires secure by wrapping the them

around a pencil.

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4. MOUNTING AND WIRING YOUR NEW THERMOSTAT

4.1 Install new thermostat base

Mount your new thermostat base using the supplied screws. Drill holes and insert wall anchors to secure the
thermostat base to the wall, if necessary.

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4.2 Connect wires to corresponding terminal blocks

CAUTION

!

Match each labeled wire to it’s corresponding terminal on the mounted thermostat base. Insert each labeled wire into
the hole of it’s matching terminal, and using the screwdriver, tighten the screw on the terminal block securely.

Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage
may occur.

4.3 Set switch and advanced wiring

If you have either a gas or oil furnace, set the switch to GAS.

If you have an electric furnace, set the switch to ELEC.

W904 Jumper

Electric / Gas
switch

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4.4 Install the batteries and attach front cover

Install the included AAA alkaline batteries and push the front cover on to the thermostat base until it’s secure.

4.5 Turn on power

Turn on your power at the source.

Congratulations! You’ve completed the thermostat installation process

5. CHECK THERMOSTAT OPERATION

Tip: If at any time during testing your system does not operate properly, please contact Customer Support at

877.654.9394 or email [e-mail]

Note: To prevent static discharge problems, touch side of thermostat to release static build-up before touching

any keys.

If at any time during testing your system does not operate properly, contact a qualied service person.

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5.1 Fan operation

If your system does not have a G terminal connection, skip to Heating System.

1. Turn on the power system

2. Move FAN switch to ON position. The blower should begin to operate.

3. Move FAN switch to AUTO position. The blower should stop immediately.

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5.2 Cooling system

CAUTION

!

To prevent compressor and/or property damage, if the outdoor temperature is below 50°, DO NOT operate the cooling system

This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize.

If the temperature is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating
the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing.
This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat.

1. Move SYSTEM switch to COOL position.

2. Press  to adjust thermostat setting below room temperature. The blower should come on immediately on

high speed, followed by cold air circulation

3. Press  to adjust temperature setting above room temperature. The cooling system should stop operating.

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5.3 Heating system

1 Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2. Press  to adjust thermostat setting above room temperature. The heating system should begin to operate.

3. Press  to adjust temperature setting below room temperature. The heating system should stop operating.

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6. PROGRAMMING YOUR THERMOSTAT

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Before you begin programming your thermostat, you should be familiar with its features and with the display and the
location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the
base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base
and press until the cover snaps onto the base.

6.1 The thermostat buttons and switches

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Raises temperature setting.

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Lowers temperature setting.

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TIME button.

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PRGM (program) button.

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RUN (program) button. Press RUN to

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resume program.

HOLD button. Press HOLD to bypass the

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program. Press RUN to resume program.

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FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

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Time Prgm Run Hold Fan

On Auto Cool Off Heat

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6.2 The display

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Indicates day of the week.

Flame icon () is displayed when the SYSTEM switch is in the HEAT position. Snowake
icon () is displayed (non-flashing) when the SYSTEM switch is in the COOL position.

Snowake is displayed (flashing) if the thermostat is in lockout mode to prevent the
compressor from cycling too quickly.

Alternately displays current time and temperature.

is displayed when the 2 “AAA” batteries are low and should be replaced.

Nothing else will be displayed. Earlier models display “LO BATTERY”.
Displays currently programmed set temperature (this is blank when SYSTEM switch is in the

OFF position).

“HOLD” is displayed when the thermostat is in the HOLD mode.

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6.3 Operating features

Now that you are familiar with the thermostat buttons and display, read the following information to learn about the

many features of the thermostat.

• SIMULTANEOUS HEATING/COOLING PROGRAM STORAGE — When programming, you can enter both your

heating and cooling programs at the same time. There is no need to reprogram the thermostat at the beginning
of each season.

• TEMPERATURE OVERRIDE— Press  or  until the display shows the temperature you want. The

thermostat will override current programming and keep the room temperature at the selected temperature until
the next program period begins. Then the thermostat will automatically revert to the program.

• HOLD TEMPERATURE — The thermostat can hold any temperature within its range for an indenite period,
without reverting to the programmed temperature. Press HOLD button. “HOLD” will be displayed. Then choose

the desired temperature by pressing  or  The thermostat will hold the room temperature at the selected
setting until you press the RUN button to start program operation again.

• ENERGY MANAGEMENT RECOVERY — Energy Management Recovery (EMR) causes the thermostat to start
heating or cooling early to make the building temperature reach the program setpoint at the time you specify.

Heating will start 5 minutes early for every 1° of temperature required to reach setpoint. Cooling will start ap­proximately 15 minutes early for every 1° because it takes longer to reach temperature. Clipping W903 jumper

will disable EMR.

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ExAMPLE: You select EMR and have your heating programmed to 65° at night and 70° at 7 AM. If the building
temperature is 65° the difference between 65° and 70° is 5°. Allowing 5 minutes per degree the thermostat
setpoint will change to 70° at 6:35 AM.

• °F/°C CONVERTIBILITY — The factory default setting is Fahrenheit. Clipping W904 jumper on the circuit board
will alter this feature to Celsius temperature setting.

• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline batteries are low and should be replaced, the display will

be blank except for . When the batteries are low, pressing any button will cause the display
to operate for ten seconds. After ten seconds, the display will be blank except for . After

has been displayed for 4 weeks, the thermostat will raise the temperature 10° above your
setpoint in COOL mode and drop the temperature 10° below your setpoint in HEAT mode. You cannot program
with low batteries, but you can override setpoint temperature.

• TEMPERATURE DISPLAY ADJUSTMENT — Your new thermostat has been accurately set in our factory.
However, if you wish, you may adjust your new thermostat temperature display to match your old thermostat.
This can be accomplished (within a ±3° range) as follows:

1. Press PRGM and RUN buttons at the same time.

2. Press  or  to adjust the displayed temperature to your desired setting.

3. Press RUN to resume normal program operation.

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• DISPLAY BACKLIGHT — (Not available on earlier models.) The display backlight improves display contrast in
low lighting conditions. Selecting backlight ON will turn the light on for a short period of time after any button is

pressed.

Selecting backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows:

1. Press TIME and RUN buttons at the same time. The display will show “d-L” and “OFF” alternately.

2. Press  or  to change “OFF” to “ON”

6.4 Programming your thermostat

This section will help you plan your thermostat’s program to meet your needs. For maximum comfort and efciency,

keep the following guidelines in mind when planning your program.

• When heating (cooling) your building, program the temperatures to be cooler (warmer) when the building is
vacant or during periods of low activity.

• During early morning hours, the need for cooling is usually minimal.

Look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply

press the RUN button to begin running the factory preset program.

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If you want to change the preprogrammed times and temperatures, follow these steps.

Determine the time periods and temperatures for your weekday and weekend programs. You must program four
periods for both the weekday and weekend program. However, you may use the same heating and cooling tem­peratures for consecutive time periods. You can choose start times, heating temperatures, and cooling tempera­tures independently for both weekday and weekend programs (for example, you may select 5:00 AM and 70° as

the weekday 1st period heating start time and temperature, and also choose 7:00 AM and 76° as the weekday
1st period cooling start time and temperature). Use the table at the bottom of the page to plan your program time

periods and the temperatures you want during each period. You may also want to look at the sample program table

to get an idea of how the thermostat can be programmed.

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7. Press RUN once. The display will show the correct time and
room temperature alternately.

COOL HEAT

Period

COOL HEAT

Heating/Cooling Schedule Plan (Factory Program)

WEEKDAY (5 DAY)

Period

Start
Time Temperature

1ST 6:00 AM 70°F 6:00 AM 70°F 6:00 AM 70°F

2ND 8:00 AM 62°F 8:00 AM 62°F 8:00 AM 62°F

3RD 5:00 PM 70°F 5:00 PM 70°F 5:00 PM 70°F

4TH 10:00 PM 62°F 10:00 PM 62°F 10:00 PM 62°F

1ST 6:00 AM 78°F 6:00 AM 78°F 6:00 AM 78°F

2ND 8:00 AM 85°F 8:00 AM 85°F 8:00 AM 85°F

3RD 5:00 PM 78°F 5:00 PM 78°F 5:00 PM 78°F

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4TH 10:00 PM 82°F 10:00 PM 82°F 10:00 PM 82°F

SAMPLE

SATURDAY (1 DAY)

Start
Time Temperature

SUNDAY (1 DAY)

Start
Time Temperature

Heating/Cooling Schedule Plan

COOL HEAT

Period

WEEKDAY (5 DAY)

Start
Time Temperature

SATURDAY (1 DAY)

Start
Time Temperature

SUNDAY (1 DAY)

Start
Time Temperature

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

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Entering your program

Follow these steps to enter the heating and cooling programs you have selected.

Set current time and day

1. Press TIME button once. The display will show the hour only.

EXAMPLE:

PM

2. Press and hold either  or  until you reach the correct hour and AM/PM designation

(AM begins at midnight; PM begins at noon).

3. Press TIME once. The display window will show the minutes only

EXAMPLE:

4. Press and hold either  or  until you reach the correct minutes.

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5. Press TIME once. The display will show the day of the week.

MO TU WE TH FR

6. Press  or  until you reach the current day of the week.

7. Press RUN once. The display will show the correct time and room temperature alternately.

Enter heating program

1. Move the SYSTEM switch to HEAT.

2. Press PRGM once. “A” (indicating weekday program) will appear in the display. Also displayed are the currently
programmed start time for the 1st heating period and the currently programmed temperature (flashing).

EXAMPLE:

AM

This display window shows that for the 1st weekday period, the start time is 6:00 AM, and 70° is the pro­grammed temperature (this example reflects factory pre-programming).

3. Press  or  to change the displayed temperature to your selected temperature for the 1st heating program

period.

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4. Press TIME once (the programmed time will flash). Press  or  until your selected time appears. The time
will change in 15 minute increments. When your selected time is displayed, press TIME again to return to the

change temperature mode.

5. Press PRGM once. The currently programmed start time and setpoint temperature for the 2nd heating program

period will appear.

6. Repeat steps 4 and 5 to select the start time and heating temperature for the 2nd heating program period.

7. Repeat steps 4 through 6 for the 3rd and 4th heating program periods. Weekday heating programs are now

complete.

8. Press PRGM once. “SA SU” (indicating weekend program) will appear in the display, along with the start time for
the 1st heating period and the currently programmed temperature.

9. Repeat steps 4 through 8 to complete weekend heating programming.

10. When you have completed entering your heating program, press RUN.

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CAUTION

!

Enter cooling program

If the outside temperature is below 50° F, disconnect power to the cooling system before programming. Energizing the air conditioner
compressor during cold weather may cause personal injury or property damage.

1. Move SYSTEM switch to COOL position.

2. Follow the procedure for entering your heating program, using your selected cooling times and temperatures.

6.5 Check Your Programming

Follow these steps to check your thermostat programming one nal time before beginning thermostat operation.

1. Move SYSTEM switch to HEAT position.

2. Press PRGM to view the 1st weekday heating period time and temperature. Each time you press PRGM, the
next heating period time and temperature will be displayed in sequence for weekday, then weekend program

periods (you may change any time or temperature during this procedure).

3. Press RUN.

4. Move SYSTEM switch to COOL position.

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5. Repeat step 2 to check cooling temperatures.

6. Press RUN to begin program operation.

YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND READY TO
AUTOMATICALLY PROVIDE MAXIMUM COMFORT AND EFFICIENCY!

7. SPECIFICATIONS

ELECTRICAL DATA

Electrical Rating:

8 to 30 VAC 50/60 Hz. or D.C.

0.05 to 1.0 Amps (Load per terminal)

1.5 Amps Maximum Total Load

(All terminals combined)

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THERMAL DATA

Setpoint Temperature Range:

45°F to 90°F (7°C to 32°C)

Operating Ambient Temperature Range:

32°F to 105°F

Operating Humidity Range:

0 to 90% RH (non-condensing)

Shipping Temperature Range:

-4°F to 149°F

8. TROUBLESHOOTING

Reset Operation

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the
thermostat by pressing, ,  and TIME at the same time. This also resets the factory defaults to the congura­tion menu and program. If the thermostat has power, has been reset and still does not function correctly contact your
heating/cooling service person or place of purchase.

Batteries

For optimum performance, we recommend replacing batteries once a year with fresh "AAA" alkaline batteries.

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Symptom Possible Cause Corrective Action

Heat, Cool or Fan Runs Constantly. 1.Blown fuse or tripped circuit breaker.

2.Furnace power switch to OFF.

3.Furnace blower compartment door or

panel loose or not properly installed.

Check each wire connection to

verify they are not shorted or touching

together. No bare wire should stick
out from under terminal screws. Try
resetting the thermostat. If the condition
persists the manufacturer of your sys-

tem or service person can instruct you
on how to test the Heat/Cool system for

correct operation. If the system operates

correctly, replace the thermostat.

No Heat 1. Pilot light not lit.

2. SYSTEM Switch not set to HEAT.

3. Loose connection to thermostat or

system.

4. Furnace Lock-Out Condition. Heat

may also be intermittent.

Re-light pilot.
Set SYSTEM Switch to HEAT and
raise setpoint temperature above room
temperature. Verify thermostat and

system wires are securely attached.

Many furnaces have safety devices that
shutdown when a lock-out condition

occurs. If the heat works intermittently
contact the furnace manufacturer or

local service person for assistance.

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Symptom Possible Cause Corrective Action

No Heat (continued) 1. Heating system requires service

or raise thermostat requires
replacement.

No Cool 1. SYSTEM Switch not set to COOL.

2. Loose connection to thermostat or
system.

3. Cooling system requires service or

thermostat requires replacement.

Diagnostic: Set SYSTEM Switch to
HEAT and the setpoint above room
temperature. Within a few seconds

the thermostat should make a soft click
sound. This sound usually indicates the
thermostat is operating properly. If the

thermostat does not click, try the reset
operation listed above. If the thermostat

does not click after being reset contact

your heating and cooling service person

or place of purchase for a replacement.

If the thermostat clicks, contact the
furnace manufacturer or a service
person to verify the heating is operating

correctly.

Set SYSTEM Switch to COOL and
lower setpoint temperature below room

temperature. Verify thermostat and

system wires are securely attached.

Same procedure as diagnostic for No
Heat condition except set the thermostat

to COOL and lower the setpoint below
the room temperature. There may be

up to a ve minute delay before the

thermostat clicks in Cooling.

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Symptom Possible Cause Corrective Action

Heat, Cool or Fan Runs Constantly. 1. Possible short in wiring.

2. Possible short in thermostat.

3. Possible short in heat/cool/fan
system.

4. FAN Switch set to Fan ON.

Furnace Cycles Too Fast or Too Slow

(narrow or wide temperature swing)

1. The location of the thermostat and/
or the size of the Heating System
may be influencing the cycle rate..

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Check each wire connection to verify

they are not shorted or touching
together. No bare wire should stick
out from under terminal screws. Try
resetting the thermostat as described

above. If the condition persists the
manufacturer of your system or service

person can instruct you on how to

test the Heat/Cool system for correct

operation. If the system operates

correctly, replace the thermostat.

Digital thermostats normally provide

precise temperature control and
may cycle faster than some older
mechanical models. A faster cycle rate
means the unit turns on and off more
frequently but runs for a shorter time
so there is no increase in energy use.
If you would like to increase the cycle

time, clip Jumper W-905 as mentioned
in the instructions for Hydronic Heating
Systems. It is not possible to shorten the

cycle time. If an acceptable cycle rate is

not achieved as received or by clipping
W-905 contact a local service person for

additional suggestions.

Symptom Possible Cause Corrective Action

Cooling cycles Too Fast or Too Slow

(narrow or wide temperature swing)

1. The location of the thermostat and
the size of the Cooling System can
influence the cycle rate.

The cycle rate for cooling is xed and

can not be adjusted. Contact a local

service person for suggestions.

Thermostat Setting and Thermostat
Thermometer Disagree

1. Thermostat thermometer setting

requires adjustment.

Thermostat Does Not Follow Program 1. AM or PM set incorrectly in program.

2. AM or PM set incorrectly on the
clock.

3. Voltage spike or static discharge

Blank Display and/or Keypad Not

Responding

1. Voltage spike or static discharge

2. Battery change required

The thermometer can be adjusted +/- 3
degrees. See Temperature Display

Adjustment in the Operation section.

Check current clock and program
settings including the AM or PM
designations for each time period. If

a voltage spike or a static discharge

occurs use the Reset Operation listed

above.

Replace batteries and check heat/cool

system for proper operation. If a voltage

spike occurs use the Reset Operation

listed above.

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CONTACT US

Customer support: 877.654.9394 or [e-mail]

MERCURY NOTICE

This product does not contain mercury. However, this product may replace a product that contains mercury.

Mercury and products containing mercury must not be discarded in household trash.

Refer to thermostat-recycle.org for location to send product containing mercury.

FOR CALIFORNIA RESIDENTS

Warning: This product contains a chemical known to the state of California to cause cancer and birth defects and
other reproductive harm.

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