Single-Stage Thermostat with scheduling Install Guide Model # P150 Made in China 37-7579B
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 Specifications.............................................. 30 Troubleshooting...........................................
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. THERMOSTAT DETAILS 2.1 The thermostat buttons and switches 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 8 8 8 8 8 8 9 9 9 9 9 9 10 10 4 10 10 10 Raises temperature setting. Lowers temperature setting. TIME button. 1 PRGM (program) button. RUN (program) button. Press RUN to resume program. HOLD button. Press HOLD to bypass the program. Press RUN to resume program.
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.
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.
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 Reversing Valve (for heat pump applications energized in Cool mode) B B Reversing Valve (for heat pump applications energized in Heat mode) 7
3.
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.
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.
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.
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 wr.techsupport@emerson.
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.
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.
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.
6. PROGRAMMING YOUR THERMOSTAT 1 1 1 Before you begin programming your thermostat, you should be familiar with its features and with the display and the 2 location and operation of the thermostat buttons. Your thermostat 2 2 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 3 3 3 and press until the cover snaps onto the base. 6.
1 1 Time 1 2 1 2 2 3 3 Fan 4 Prgm Run Hold 1 2 3 1 2 3 4 5 6 2 3 4 5 6 7 3 4 5 6 7 8 4 5 6 7 8 9 On 4Auto System 5 Heat Cool Off 1 2 3 4 5 6 7 8 9 17
6.2 18 4 7 5 5 6 5 The 8 6 6 7 6 9 7 7 8 7 10 8 8 9 8 11 9 9 10 9 12 10 10 11 10 13 11 11 12 11 14 12 12 13 12 15 13 13 14 13 16 14 14 15 14 17 15 15 16 15 18 16 16 17 16 19 17 17 18 display Indicates day of the week. Flame icon () is displayed when the SYSTEM switch is in the HEAT position. Snowflake icon () is displayed (non-flashing) when the SYSTEM switch is in the COOL position.
3 5 6 7 8 9 10 11 12 13 14 15 16 17 4 5 6 7 8 9 10 11 12 13 14 15 6 7 8 9 10 11 12 13 14 15 16 17 18 1 7 2 8 3 1 1 4 2 2 5 3 3 6 4 4 7 5 5 8 6 6 9 7 7 10 8 8 11 9 9 12 10 10 13 11 11 9 10 11 12 13 14 15 16 17 18 19 19
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. 20 • 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.
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.
• 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.
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.
room temperature alternately.
Heating/Cooling Schedule Plan SATURDAY (1 DAY) WEEKDAY (5 DAY) Period Start Time Temperature Start Time Temperature SUNDAY (1 DAY) Start Time Temperature HEAT 1ST 2ND 3RD 4TH COOL 1ST 2ND 3RD 4TH 25
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.
5. Press TIME once. The display will show the day of the week. 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).
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.
Enter cooling program ! CAUTION 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. 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 THERMAL DATA Electrical Rating: 8 to 30 VAC 50/60 Hz. or D.C. 0.05 to 1.0 Amps (Load per terminal) Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C) 1.
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 configuration 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.
Symptom Possible Cause Corrective Action Heat, Cool or Fan Runs Constantly. 1.Blown fuse or tripped circuit breaker. 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 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. 2.
Symptom Possible Cause Corrective Action No Heat (continued) 1. Heating system requires service or raise 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.
Symptom Possible Cause Corrective Action Heat, Cool or Fan Runs Constantly. 1. Possible short in wiring. 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. 2.
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 fixed and can not be adjusted. Contact a local service person for suggestions. Thermostat Setting and Thermostat Thermometer Disagree 1. Thermostat thermometer setting requires adjustment. The thermometer can be adjusted +/- 3 degrees.
CONTACT US Customer support: 877.654.9394 or wr.techsupport@emerson.com 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.
