Single-Stage Thermostat
with scheduling
Install Guide
Model # P150 |
37-7579 |
Made in China |
GUIDE CONTENTS |
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Preparations.................................................. |
3 |
Thermostat details......................................... |
4 |
Removal of your old thermostat.................... |
5 |
Mounting and wiring your new thermostat.. 10 |
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Checking thermostat operation................... |
12 |
Programming your thermostat..................... |
16 |
Specifications.............................................. |
30 |
Troubleshooting.......................................... |
31 |
!WARNING
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.
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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: |
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□ Wire cutters/stripper |
□ Hammer |
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2. THERMOSTAT DETAILS
2.1 The thermostat buttons and switches
Raises temperature setting. Lowers temperature setting. TIME button.
PRGM (program) button.
RUN (program) button. Press RUN to resume program.
HOLD button. Press HOLD to bypass the program. Press RUN to resume program.
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
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1 |
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2 |
Time |
Prgm |
Run |
Hold |
Fan |
System |
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On |
Auto |
Cool Off Heat |
3 |
4 |
5 |
6 |
7 |
8 |
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3. REMOVING OLD THERMOSTAT
3.1 Turn off power
or
!WARNING
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
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.
! CAUTION
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 |
Label the wires with the |
Terminal function |
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the following letter |
following letters |
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RH, R, R5, 5 |
RH |
24V Power (Heating) |
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RC |
RC |
24V Power (Cooling) |
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W, W1, 4 |
W |
Heating Relay |
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Y, Y1 |
Y |
Cooling Relay |
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G |
G |
Fan Relay |
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O |
O |
Reversing Valve (for heat pump applications |
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energized in Cool mode) |
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B |
B |
Reversing Valve (for heat pump applications |
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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… |
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Terminal RC and RH are connected |
Leave the jumper wire in its place |
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with a jumper wire |
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There’s only one R wire (RC, RH, R or R5) |
Leave the jumper wire in its place |
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coming out of the wall |
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Terminal RC and RH (or 5 or R5) are NOT |
Remove the jumper wire between RC and RH |
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connected by a jumper wire |
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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!
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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
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.
! CAUTION
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 |
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switch |
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