Emerson P150 User Manual
Single-Stage Thermostat
with scheduling
Install Guide
Model # P150
Made in China
37-7579
2
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
Specications ............................................. 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
3
2. THERMOSTAT DETAILS
1
1
2
1
2
3
1
2
3
4
1
2
3
4
5
1
2
3
4
5
6
1
2
3
4
5
6
7
1
1
2
1
2
3
1
2
3
4
1
2
3
4
5
1
2
3
4
5
6
1
2
3
4
5
6
7
2.1 The thermostat buttons and switches
Raises temperature setting.
1
Lowers temperature setting.
2
TIME button.
3
PRGM (program) button.
4
RUN (program) button. Press RUN to
5
resume program.
6
HOLD button. Press HOLD to bypass the
program. Press RUN to resume program.
7
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
8
4
Time Prgm Run Hold Fan
On Auto Cool Off Heat
3
4
5
6
1
2
System
7
8
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.
5
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.
6
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)
7
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
wr.techsupport@emerson.com — we’re here to help!
8
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.
9
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.
10
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
11
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