Universal Digital 7 Day Programmable Comfort-Set® 90 Series TM P R E M I U M Model 975 Installation and Operating Instructions Retain for Future Use
Easy, Menu-Driven Set-Up and Programming 1 2 3 4 5 6 7 8 9 10 11 12 Premium options to customize the thermostat to fit your application.
INTRODUCTION Thank you for purchasing your new Model 975 thermostat. White-Rodgers has been producing energy saving controls for over 60 years. We have been designing and producing the Comfort-Set family of electronic programmable thermostats since 1982. Model 975 is the third generation of the electronic programmable family. We believe you will find that Model 975 is the most user friendly and technologically advanced thermostat available today.
ORIENTATION THE THERMOSTAT BUTTONS See inside front cover for illustration showing button locations. 1 (Blue arrow) Lowers temperature setting (45°F or 7°C minimum) 2 (Red arrow) Raises temperature setting (99°F or 37°C maximum) 3 The yellow indicator glows when the system is operating. 7 Used to adjust the time backward, or to select the previous menu item. 14 Used to set the filter change-out time, or to set the filter change timer. 8 Used to adjust the time forward, or to select the next menu item.
THE DISPLAY 18 Displays system mode (HEA HEA T , OFF HEAT OFF, COOL O , HOLD CA). COOL, AUT UTO HOLD, or VACA During programming displays the time MOR, DAY, EVE, NHT period (MOR, NHT) being programmed.. In the configuration menu, the menu item name is shown, PR GM MODE MODE, one word at a time (PR PRGM EMR EMR, COOL FAN DELA OFF OFF, etc.). 19 CHECK BATTERY appears when the “AA” alkaline batteries are weak and should be replaced. BATTERY appears when the thermostat is running on AT STA battery power only.
INSTALLATION DESCRIPTION This White-Rodgers Automatic Setback Digital Thermostat uses microcomputer technology to provide precise time and temperature control. This thermostat offers the flexibility to design heating and cooling programs that fit personal needs. This thermostat is adaptable to most 24 Volt residential forced air, hydronic (hot water or steam), millivolt, electric heat, zone and single-stage heat pump systems. Standard Systems: Fuel: gas, oil, electric.
PRECAUTIONS ! WARNING ▲ ! CAUTION ▲ Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage. To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. Do not use on circuits exceeding specified voltage. Higher voltage will damage thermostat and could cause shock or fire hazard.
INSTALLATION ATTENTION! This product does not contain mercury. However, this product may replace a unit which contains mercury. Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing nonabsorbent gloves, take up the spilled mercury with sand or other absorbent material and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded. Mercury must not be discarded in household trash.
4 Insert the wires into the terminals on the base using the appropriate wiring diagram and tighten the terminal screws. 3 2 1 CONFIGURING AND PROGRAMMING S1 S2 S3 MV W RH RC G Y O B 1 6 Before the power is turned on, the thermostat must be configured to operate properly with the system. See the CONFIGURATION section of this manual. This thermostat can be programmed for automatic temperature control. Figure 1.
WIRING DIAGRAMS All wiring diagrams are for typical systems only. Refer to equipment manufacturers’ instructions for specific system wiring information. 1 3 2 H MV 6 Y G W O B RC RH W MV W RH RC G E J O B 6 K I M 2 From 24 VAC transformer See page 10 for letter identification.
1 3 2 4 5 H MV 6 Y G W C D E O B RC RH 4 Red jumper wire (provided) 5 Red jumper wire (provided) G Y Y O B 6 L K I M 1 From heating system 3 Red jumper wire (provided) RH MV W RH RC G J 2 From 24 VAC transformer W NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is connected between thermostat’s RH and RC terminals for proper operation with this system. NOTE: For three-wire heat only system, connect terminals G , W , and RH RH.
WIRING DIAGRAMS 1 MV 6 Y G W O B RC RH MV RH MV W RH RC G A Y O B 6 NOTE: Thermostat must have batteries installed. 1 From millivolt system Figure 4.
1 MV A 6 Y G C D W O B RC RH MV 3 2 RH RC MV W RH RC G G Y Y O B L J K I M 1 From heating system 2 From 24 VAC transformer NOTE: Thermostat must have batteries installed. 3 From fan relay 4 From cooling system See page 10 for letter identification. Figure 5.
WIRING DIAGRAMS 1 3 2 1 H MV 6 Y 6 4 5 1 2 B G W O B RC RH 3 Red jumper wire (provided) Y O B 6 L K I M 1 From zone valve (through zone valve) 6 RH MV W RH RC G J 2 From 24 VAC transformer W NOTE: Thermostat must have batteries installed. NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is connected between thermostat’s RH and RC terminals for proper operation with this system. See page 10 for letter identification. Figure 6.
1 MV 6 Y G W O B RC 3 2 RH W RH R C 5 4 G Y Y O L C D MV W RH RC G E J K N M L J 1 From heating system K O M 2 From 24 VAC heating transformer 3 From 24 VAC cooling transformer 4 From fan relay 5 From cooling system See page 10 for letter identification. Figure 7.
WIRING DIAGRAMS 2 1 P MV 6 Y G C D 3 4 5 H W O B F G RC RH RC MV W RH RC G G Y Y O B 6 L J K I M 1 From heating system 2 Red jumper wire (provided) 3 Field-installed jumper wire 4 From fan relay NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is connected between thermostat’s RH and RC terminals for proper operation with this system. 5 From cooling system See page 10 for letter identification. Figure 8.
CONFIGURATION JUMPERS Before turning power on to the system, the jumpers on the back of the thermostat must be configured to operate correctly with the system equipment. This thermostat is configured from the factory to operate a standard fossil fuel (gas, oil, etc.), forced hot air system with a single stage air conditioning compressor and fan. This is the correct configuration for any system that DOES NOT require the thermostat to energize the fan on a call for heat. instantly on a call for heat.
CONFIGURATION MENU Step Press Button(s) Displayed (Factory Default) Press or to select: COMMENTS Selects EMR option ON or OFF 1 TIME FWD EMR (ON) OFF 2 TIME FWD SET CYCL HEAT (05) 02 - 40 Adjusts heat anticipation value (2 through 40) 3 TIME FWD SET CYCL COOL (14) 09 - 40 Adjusts cool anticipation value (9 through 40) 4 TIME FWD COOL FAN DELA OFF (01) 01 - 127 Adjusts cool fan-off delay (1 through 127 sec.
Adjusts temperature display higher or lower 8 TIME FWD 0˚F (0) 5 LO to 5 HI 9 TIME FWD (˚F) C 10 TIME FWD BEEP (ON) OFF Turns beeper ON or OFF 11 TIME FWD REMT SEN (OFF) ON Selects remote sensor OFF or ON 12 TIME FWD PART LOCK (OFF) ON Selects partial keypad lockout OFF or ON 13 TIME FWD LOCK (OFF) ON Selects total keypad lockout OFF or ON 14 PROGRAM Adjusts temperature display to ˚F or ˚C Returns to normal operation RUN 17 Installation
CONFIGURATION INSTALLER CONFIGURATION The configuration settings can be changed at any time to meet system or personal requirements. Press PROGRAM RUN to make certain the thermostat is in the run program mode, then press TIME FWD and TIME BACK at the same time to enter the configuration menu. The display will change to show the first option on the configuration menu. The chart on page 16 briefly describes each option on the menu.
PROGRAMMABLE COOL FAN-ON AND FAN-OFF DELAY COOLING is from 9 to 40. The factory preset is 14. The recommended initial setting for hydronic systems is 35. This option allows a selection of a fan-on delay of 1 to 5 seconds on a call for cool and 1 to 127 seconds of fan-off delay after the thermostat has satisfied the call for cool. A short delay to allow the A-coil to cool off before the fan turns on may The cooling will not go below 9 because compressors require a longer cycle.
CONFIGURATION would be set so the fan shuts off just as the cool air is exhausted. If this timing is set too long the fan may begin blowing warm air before it shuts off. Shortening the fan-off delay will prevent this. COMPRESSOR LOCKOUT This thermostat is designed to protect the system against premature compressor failure by “locking out” the compressor for at least five minutes after each cycle. When the thermostat is in compressor lockout, the word COOL will flash on the display.
CHECK THERMOSTAT OPERATION temperature display. After the thermostat is installed and configured, do the following to ensure proper operation. This is an excellent feature if the thermostat is in a poor location for sensing temperature or the thermostat is in a separate room to prevent tampering. FAN OPERATION If your system does not have a G terminal connection, skip to “Heating System” section.
CHECK THERMOSTAT OPERATION COOLING SYSTEM RESETTING THERMOSTAT ! WARNING To prevent compressor and/ or property damage, if the outdoor temperature is below 50°F (10°C), DO NOT operate the cooling system. 1. Press SYSTEM until COOL is displayed. to adjust thermostat 2. Press setting below room temperature. The fan should come on (after the fan-on delay time, if any), followed by cold air circulation. 3. Press to adjust temperature setting above room temperature.
CONFIGURATION The configuration menus allow you to set certain thermostat operating characteristics to your system or personal requirements. To enter the User Configuration menu, press PROGRAM RUN to make sure the thermostat is in the run program mode, then press TIME FWD and TIME BACK at the same time to enter the configuration menu. The display will show the first item in the configuration menu. The following chart (pages 24 & 25) describes each item on the menu and the applicable model(s).
CONFIGURATION MENU Step Press Button(s) Displayed (Factory Default) Press or OFF to select: COMMENTS Selects EMR option ON or OFF 1 TIME FWD EMR (ON) 2 TIME FWD SET CYCL HEAT Recommend installer setting 3 TIME FWD SET CYCL COOL Recommend installer setting 4 TIME FWD COOL FAN DELA OFF Recommend installer setting 5 TIME FWD COOL FAN DELA ON Recommend installer setting 6 TIME FWD COMP LOCK Recommend installer setting 7 TIME FWD SYSTEM Recommend installer setting 24
8 TIME FWD 0˚F (0) 5 LO to 5 HI 9 TIME FWD (˚F) ˚C 10 TIME FWD BEEP (ON) OFF 11 TIME FWD REMT SEN 12 TIME FWD 13 TIME FWD 14 PROGRAM Adjusts temperature display higher or lower Adjusts temperature display to ˚F or ˚C Turns beeper ON or OFF Recommend installer setting PART LOCK (OFF) ON Selects partial keypad lockout OFF or ON LOCK (OFF) ON Selects total keypad lockout OFF or ON Returns to normal operation RUN 25 Configuration
PROGRAMMING MANUAL OPERATION Your Comfort-Set 90 thermostat can be used to control temperature manually (without programming). For manual operation, press SYSTEM to select HEAT or COOL COOL, then press PROGRAM HOLD . Use or to set the temperature as desired. PROGRAMMED OPERATION Planning Your Program The sample schedule (pages 28 & 29) shows the factory installed programs for heating and cooling. The heating and cooling programs are separate, and must be programmed individually.
and the settings for time and temperature. 9. If you program Monday the first time you press PROGRAM VIEW it will be copied to the rest of the week. To program the other days of the week press ADV. /DAY to until you reach the day you wish to change and follow Steps 10, 11 & 12. You can also copy the program from one day to another. To copy, press HOLD /COPY. The display will show COPY, and all the other days of week will be flashing.
7 Day Sample HEAT Program Schedule (Shows factory programming) 1 1 2 3 4 5 6 2 3 4 5 6 5 6 5 6 5 6 MON 6:00 AM 70°F (21°C) 8:00 AM 62°F (16°C) 5:00 PM 70°F (21°C) 10:00 PM 62°F (16°C) TUE 6:00 AM 70°F (21°C) 8:00 AM 62°F (16°C) 5:00 PM 70°F (21°C) 10:00 PM 62°F (16°C) WED 6:00 AM 70°F (21°C) 8:00 AM 62°F (16°C) 5:00 PM 70°F (21°C) 10:00 PM 62°F (16°C) THU 6:00 AM 70°F (21°C) 8:00 AM 62°F (16°C) 5:00 PM 70°F (21°C) 10:00 PM 62°F (16°C) FRI 6:00 AM 70°F (21
7 Day Sample COOL Program Schedule (Shows factory programming) 1 MON 1 2 3 4 5 6 2 3 4 5 6 5 6 5 6 5 6 6:00 AM 78°F (25°C) 8:00 AM 85°F (29°C) 5:00 PM 78°F (25°C) 10:00 PM 82°F (27°C) TUE 6:00 AM 78°F (25°C) 8:00 AM 85°F (29°C) 5:00 PM 78°F (25°C) 10:00 PM 82°F (27°C) WED 6:00 AM 78°F (25°C) 8:00 AM 85°F (29°C) 5:00 PM 78°F (25°C) 10:00 PM 82°F (27°C) THU 6:00 AM 78°F (25°C) 8:00 AM 85°F (29°C) 5:00 PM 78°F (25°C) 10:00 PM 82°F (27°C) FRI 6:00 AM 78°F (25
7 Day Personal HEAT Program Schedule 1 5 2 6 5 3 6 5 MON TUE WED THU FRI SAT SUN 1 2 3 4 5 6 Morning (MOR) Day (DAY) Evening (EVE) Night (NHT) Start Time Temperature 30 4 6 5 6
7 Day Personal COOL Program Schedule 1 5 2 6 5 3 6 5 4 6 MON TUE WED THU FRI SAT SUN 1 2 3 4 5 6 Morning (MOR) Day (DAY) Evening (EVE) Night (NHT) Start Time Temperature 31 Programming 5 6
FEATURES Large Lighted Liquid Crystal Display (LCD). The large numbers and letters on your LCD screen make it easy to see. In low light conditions, press the button on top of the thermostat and the display will light up for three seconds. For ten minutes after pressing the light button, pressing any other button will light the display for ten seconds. The display light uses power from the 3 “AA” alkaline batteries installed. Excessive use of the display light will reduce battery life.
is 3 hours and 45 minutes. Cooling can start earlier because it takes longer for cooling systems to reach the desired temperature. To select or deselect this feature, refer to the CONFIGURATION section (page 24, step 1). Adjustable Temperature Display. The room temperature display can be adjusted to read higher or lower by following the configuration menu and adjusting the temperature to a higher or lower value.
from heating to cooling as needed. To set your thermostat to this operating mode, press SYSTEM button until AUTO is displayed on the screen. Pressing the and buttons at the same time will change the setpoint temperature displayed to the setpoint of the other mode. This will allow you to modify both the HEAT and COOL setpoints to accommodate a HOLD condition while in Automatic Changeover mode. Air Filter Change-Out Indicator.
a specific amount of time, press or until the temperature you want is displayed. The display will indicate HOLD, and the number of hours remaining in the hold period will be indicated with the word HRS. To adjust the length of time for the override, press TIME FWD or TIME BACK . HOLD TILL will be displayed as well as the HOLD period expiration time. Press TIME FWD or TIME BACK buttons until you reach the time you would like it to resume the program.
Daylight Savings Time Button. One button adjustment allows you to change your thermostat clock between Standard Time and Daylight Savings time. Simply push the DAYLIGHT SAVINGS TIME button to advance the time forward one hour in the Spring. In the Fall, press the DAYLIGHT SAVINGS TIME button twice to fall back an hour. If you push it three times in a row (in less than 30 seconds) it will return to the original time setting. After clock adjustment, press PROGRAM RUN to resume your normal program.
allows only the or to operate for temporary temperature overrides. It also limits the temperature to the maximum heating and minimum cooling temperatures used in your program. This is especially useful in buildings where unscheduled events are common. Anyone can change the temperature, but only between the temperatures you set and only for two hours or the number of hours you specify if you set up your Hold Till timing (see Temporary Program Override (page 34).
• One of the buttons is stuck down or in. Check buttons, make sure nothing is pushing them in. • The thermostat sensor is not functioning. If using a remote sensor, check connections, wiring and power. After checking the above, press PROGRAM RUN to reset the display. If this does not clear the display, disconnect power and remove the batteries for five minutes. If these checks fail to solve the problem, the thermostat should be replaced. Compressor Short-Cycle Protection.
INDEX Adjustable Temperature Display 33 Air Filter Change-out Indicator 34 Arm Chair Programming -------- 33 Automatic Changeover --------- 33 Battery Back-Up ------------------ 37 COMPONENTS ------------------- 2 Thermostat Buttons ------------ 2 Display --------------------------- 3 Compressor Short-Cycle Protection -------------------------- 38 CONFIGURATION -------------- 23 Configuration Menu Chart ------ 24 Copy -------------------------------- 27 Daylight Savings Time Button -- 36 Energy Management R
NOTES
The Emerson logo is a trademark and service mark of Emerson Electric Co. White-Rodgers is a division of Emerson Electric Co. Printed in U.S.A. PART NO.
