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installation, start-up  
and service instructions  
TEMPSURE COMMERCIAL THERMOSTAT  
(P/N TSTATBBP250-LA)  
Cancels: New  
II TSTAT-9  
1/1/98  
1
CONTENTS  
GENERAL  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . 1  
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7  
I. Select Thermostat Location . . . . . . . . . . . . . . . . . . 1  
II. Install Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
III. Set Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
IV. Heat Pump Configuration . . . . . . . . . . . . . . . . . . . . 2  
V. Configure Advanced Setup . . . . . . . . . . . . . . . . . . . 2  
VI. Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
VII. Program Thermostat Schedules . . . . . . . . . . . . . . . 5  
VIII. Calibrate Temperature Sensor . . . . . . . . . . . . . . . . 6  
IX. Light Sensor Adjustment . . . . . . . . . . . . . . . . . . . . 6  
X. Check Thermostat Operation . . . . . . . . . . . . . . . . . 6  
XI. Final Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
The 7-day, commercial, programmable thermostats are wall-  
mounted, low-voltage thermostats which maintain room tem-  
perature by controlling the operation of an HVAC (heating,  
cooling and ventilation) system. Separate heating and cool-  
ing set points and auto-changeover capability allow occupied  
and unoccupied programming for energy savings.  
All thermostats allow up to 4 time/temperature settings to  
be programmed per 24-hour period. Each thermostat stores  
programs for 7 independent days. Batteries are not required.  
During power interruption the internal NEVERLOST™  
memory stores programmed schedules for an unlimited time  
while the clock continues to run for at least 48 hours.  
The thermostat can be configured to accept several different  
equipment configurations, including heat pump operation.  
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8  
I. Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
II. Light-Activated Operation . . . . . . . . . . . . . . . . . . . . 7  
III. Two-Stage Operation . . . . . . . . . . . . . . . . . . . . . . . . 7  
IV. Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
V. Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
VI. Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
VII. Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
VIII. Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
IX. Remote Temperature Sensor . . . . . . . . . . . . . . . . . 8  
X. Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
NOTE: The thermostat is not factory-configured for use in  
heat pump applications. The advanced setup must be per-  
formed to configure the thermostat for use with heat pump  
units.  
A light sensor is provided on the thermostat for light activa-  
tion. When the sensor detects light (the space is occupied),  
the thermostat will enter Occupied 1 mode. If the room is  
dark, the thermostat will follow its programmed schedule.  
INSTALLATION  
I. SELECT THERMOSTAT LOCATION  
The thermostat should be mounted:  
• approximately 5 ft from the floor  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
IMPORTANT: Read entire instructions before starting the  
installation.  
close to or in a frequently used room, preferably on an in-  
side partitioning wall  
SAFETY CONSIDERATIONS  
Read and follow manufacturer instructions carefully. Follow  
all local electrical codes during installation. All wiring must  
conform to local and national electrical codes. Improper wir-  
ing or installation may damage thermostat.  
• on a section of wall without pipes or ductwork  
• where temperature operating limits are within 41 to 104 F  
(5 to 40 C)  
where humidity operating range is within 0 to 95% rela-  
tive humidity, non-condensing  
Recognize safety information. This is the safety alert symbol  
.
When the safety alert symbol is present on equipment or  
The thermostat should NOT be mounted:  
in the instruction manual, be alert to the potential for per-  
sonal injury.  
close to a window, on an outside wall, or next to a door  
leading to the outside  
Understand the signal words DANGER, WARNING, and CAU-  
TION. These words are used with the safety alert symbol.  
DANGER identifies the most serious hazards which will re-  
sult in severe personal injury or death. WARNING signifies  
a hazard which could result in personal injury or death. CAU-  
TION is used to identify unsafe practices which would result  
in minor personal injury or property damage.  
where exposed to direct light and heat from a lamp, the  
sun, a fireplace, or any other temperature-radiating object  
which may cause a false reading  
close to or in direct airflow from supply registers or return  
air grilles  
• in areas with poor air circulation (such as behind a door or  
in an alcove)  
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II. INSTALL THERMOSTAT  
7
. Secure mounting base to wall with 2 screws and an-  
chors provided. Ensure all wires exit through hole in  
mounting base.  
WARNING: Before installing thermostat, turn off all  
power to the unit. There may be more than one power  
disconnect. Electrical shock can cause injury or death.  
8. Adjust wire length and routing to allow proper closure  
of the thermostat. Strip each wire at the end no more  
1
than ⁄  
4
-in. to prevent adjacent wires from shorting to-  
1
2
. Turn off all power to unit.  
gether. Match and connect wires to terminals on the  
thermostat. See Fig. 2-4 and Table 1.  
. If an existing thermostat is being replaced:  
a. Remove existing thermostat from the wall.  
CAUTION: Improper wiring or installation may cause  
damage to the thermostat. Check to ensure wiring is  
correct before proceeding with installation of unit.  
b. Disconnect wires from existing thermostat. Do not  
allow wires to fall back into the wall. As each wire  
is disconnected, record wire color and terminal  
connection.  
9. Push excess wiring into wall. Seal hole in wall to pre-  
vent drafts.  
c. Discard or recycle old thermostat.  
1
0. Re-attach thermostat cover to back plate by aligning  
the top two prongs of the back plate in the vertical groove  
of the top cover and then snapping the cover onto the  
back plate.  
NOTE: Mercury is a hazardous waste and must be disposed  
of properly.  
3
. Remove the thermostat cover from wall plate (mount-  
ing base) to expose mounting holes. See Fig. 1. With  
the thermostat facing forward, press the back plate on  
the left hand side top corner to release the two prongs  
holding on the cover. Pull off the cover when the prongs  
have been disengaged.  
1
1. Turn on power to unit. The thermostat will receive power  
from the unit. The thermostat will be powered by 24 v,  
nominal (18 to 30 vac). Terminals R (+ 24 v), W1/O/B  
(first stage heat or reversing valve), Y1 (first stage cool-  
ing), and G (fan relay) will always be connected. Some  
applications will use C (common), Y2 (second stage cool-  
ing), or W2 (second stage heating).  
4
. Route thermostat wires through large hole in mount-  
ing base. Remove outer sheath from wires for added  
flexibility. Standard solid or multi-conductor thermo-  
stat wire should be used from the thermostat to the  
unit. Size a n d len gt h con sid er a t ion s a r e a s fol-  
low s: for a m a xim u m d ista n ce fr om u n it of 36 ft,  
u se 22 AWG (Am er ican Wir e Gage) wir e; for a m axi-  
m u m distan ce fr om u n it of 100 ft, u se 18 AWG wir e.  
III. SET CLOCK  
The Set Clock button allows the user to change the time and  
day displayed on the thermostat. Press the Set Clock button.  
The current time will blink on and off. Press the UP ARROW  
and DOWN ARROW buttons until the correct time is shown.  
Hold down the buttons to quickly move through the time dis-  
play. Press and hold the Fan button while pressing the UP or  
DOWN ARROW buttons to scroll through by hours. The AM  
and PM annunciators will automatically change. To ensure  
the schedules are properly followed, make sure that AM or  
PM is correct for the time chosen. When the correct time is  
shown, press the Mode button to modify the day of the week.  
The current day will blink on and off. Press the UP ARROW  
and DOWN ARROW buttons until the correct day is shown.  
Press the Set Clock button again to exit the Set Time mode.  
IV. HEAT PUMP CONFIGURATION  
To configure the thermostat for heat pump operation, Ad-  
vanced Setup Steps 3 (Heat Pump Operation) and 4 (Revers-  
ing Valve Polarity) must be configured correctly. See the  
Configure Advanced Setup section for information on config-  
uring these options.  
NOTE: Some large commercial rooftop heat pump units (542J )  
must be configured with Advanced Setup Step 3 (Heat Pump  
Operation) set to OFF. Refer to the base unit instructions for  
more information.  
Fig. 1 — Thermostat Mounting  
V. CONFIGURE ADVANCED SETUP  
To enter into the advanced setup screens of the thermostat,  
press the Mode and Program buttons at the same time. The  
Advanced Setup Step number is shown in the top right cor-  
ner of the thermostat screen. Use the Mode button to ad-  
vance through the steps. There are 17 Advanced Setup Steps.  
See Table 2. Press the Program button at any time to exit the  
Advanced Setup mode.  
5
. Level mounting base against wall and mark wall through  
the 2 mounting holes in base.  
. Drill two 316-in. mounting holes in wall where marked.  
6
WARNING: Be careful not to drill into wiring in wall.  
Electrical shock could result.  
NOTE: Advanced Setup Steps 1 and 2 are configured with  
the Set Clock button, and are not accessed through the ad-  
vanced setup screens.  
2—  
href="
LEGEND  
W2  
Second-Stage Heat  
W1/O/B  
First-Stage Heat or Reversing Valve  
First-Stage Compressor  
Fan  
Y2  
Second-Stage Compressor  
Second Remote Sensor (Not Used)  
+5 vdc for 2 Sensors  
Y1  
RS2  
G
RS+5  
RS1  
W3/ECO  
CK1  
CK2  
R
Third-Stage Heat or Economizer (Not Used)  
Dry Contact  
Remote Sensor  
Ground for 2 Sensors  
RS GND  
Dry Contact Ground  
24 vac Transformer  
C
24 vac Transformer Common  
Fig. 2 — Thermostat Wiring  
THERMOSTAT  
TYPICAL  
UNIT  
Table 1 — Thermostat Wiring Terminations  
B
O
EXISTING  
WIRE  
W2 Y2 R W1 Y1 G  
C
TERMINAL  
CONNECTION  
FUNCTION  
L
DESIGNATION  
G or F  
Fan  
G
Y1  
E
C
G
2
4 VAC COMMON  
Y1, Y, or C  
Cooling  
FAN RELAY  
W1, W, or H  
Heating  
W1/O/B  
R
COMPRESSOR RELAY  
st STAGE HEAT CIRCUIT  
Rh, R, M, Vr, or A  
Power (24 v)  
Y1  
C
Common  
C*  
O
O/B  
Y2  
Reversing Valve  
Second Stage Cooling  
Second Stage Heating  
Remote Sensor (5 vdc)  
Remote Sensor Signal  
Remote Sensor Ground  
Dry Contact Switch  
Dry Contact Ground  
W1/O/B†  
Y2*  
1
W1  
R
2
4 VAC RETURN  
W2  
W2*  
Y2  
RS+5  
RS  
RS+5  
RS1  
2
nd STAGE HEAT CIRCUIT  
W2  
RS G  
CK1  
CK2  
RS GND  
CK1  
Fig. 3 — Typical Wiring (Single-Stage Cooling Units)  
CK2  
THERMOSTAT  
TYPICAL  
UNIT  
B
O
*Terminals C, Y2, and W2 may not be used in all applications.  
†Used on Heat Pump applications only.  
W2 Y2 R W1 Y1 G  
C
L
E
C
G
2
4 VAC COMMON  
FAN RELAY  
COMPRESSOR RELAY  
st STAGE HEAT CIRCUIT  
Y1  
O
1
W1  
R
2
4 VAC RETURN  
nd STAGE COMPRESSOR RELAY  
nd STAGE HEAT CIRCUIT  
2
Y2  
2
W2  
Fig. 4 — Typical Wiring (Two-Stage Cooling Units)  
3—  
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A. Heat Pump Configuration (Steps 3 and 4)  
I. Soft Start (Step 13)  
To set the thermostat for heat pump operation, Advanced Setup  
Step 3 must be configured to ON. Use the UP and DOWN  
ARROW buttons to configure the step. The default is OFF.  
Press the mode button to continue to Step 4. Step 4 is used to  
set the reversing valve polarity for the heat pump. The vari-  
able can be set to either ‘‘B’’or ‘‘O.’’ Set the reversing valve  
polarity to the correct value depending on the application. The  
default is ‘‘O.’’  
The soft start is used when multiple units are used in an ap-  
plication. The soft start staggers the start up times of the  
units in the event of power loss and restart. Each unit should  
be assigned a unit ID number. The 30-second delay time is  
multiplied by the unit ID number to get the total soft start  
delay time for each unit. For example, if the unit ID number  
is 10, set the Soft Start function to 10, the start-up delay time  
is 30 seconds x 10 = 300 seconds (5 minutes). The range is 0  
to 99 (ID numbers). A value of 0 disables the function. The  
default is 0 (ID number).  
NOTE: Step 4 will appear only if Step 3 is set to ON. Step 5  
will appear only if Step 3 is set to OFF.  
J. Farenheit/Celsius Operation (Step 14)  
B. Electric Heat Configuration (Step 5)  
The thermostat can be set to operate in Fahrenheit or Cel-  
sius degrees. Set the variable to ‘‘F’’ for Fahrenheit opera-  
tion. Set the variable to ‘‘C’’ for Celsius operation. The default  
is ‘‘F.’’  
Step 5 is used to configure the thermostat for electric heat.  
The variable can be configured ON or OFF. The default is  
OFF.  
NOTE: Step 5 will appear only if Step 3 is set to OFF.  
K. Security Level (Steps 15 to 17)  
C. Deadband (Step 6)  
The Security Level limits the actions that the user can per-  
form at the thermostat. There are 4 security levels. When the  
security level is set to ‘‘0,’’ no security will be in effect. When  
the security level is set to ‘‘1,’’ the set point range is limited  
by the settings of Steps 16 and 17. When the security level is  
set to ‘‘2,’’ the set point range is limited by the settings of  
Steps 16 and 17 and the Program On mode is always in ef-  
fect. When the security level is set to ‘‘3,’’ the set point range  
is limited by the settings of Steps 16 and 17, the Program On  
mode is always in effect, and set point changes are prohib-  
ited. The default is 0.  
The deadband is the difference in temperature above the cool-  
ing set point or below the heating set point that the thermo-  
stat will wait before turning on the first stage of heating or  
cooling. For example, if the cooling set point is 82 F (28 C)  
and the deadband is 2 degrees, the first stage of cooling will  
not be energized until the temperature reaches 84 F (30 C).  
The range of values is 1 to 6 degrees. The default is 2 degrees.  
D. Set Point Minimum Difference (Step 7)  
The minimum difference between heating and cooling set points  
can be user-configured. The range is from 0 to 6 degrees. The  
default is 2 degrees. The minimum difference is enforced dur-  
ing Autochangeover and Program On operation.  
Security Maximum Heat Set Point (Step 16)  
If the Security Level is not set to 0, the maximum heating  
set point will be in effect. The user will not be allowed to set  
the heating set point over the specified value. The range of  
values is 35 to 99 F (1 to 37 C). The default is 80 F (27 C).  
E. Cycles Per Hour Limit (Step 8)  
The number of times that heating or cooling can be ener-  
gized per hour can be configured. Set the variable to ‘‘d’’ for  
no limit. Set the variable to ‘‘d1’’ to disable the 5-minute com-  
pressor lockout. The variable can also be set from 2 to 6 cycles  
per hour. The default is 6 cycles per hour.  
Table 2 — Advanced Setup Configuration  
STEP  
DESCRIPTION  
RANGE  
DEFAULT  
1
2:00 AM -  
1*  
Time of Day  
12:00 AM  
CAUTION: Damage to compressor could result if  
11:59 PM  
5
-minute compressor lockout is disabled or compressor  
Sunday through  
Saturday  
2
3
4
*
Day of the Week  
Heat Pump  
Monday  
Off  
is allowed unlimited cycles. Do not set thermostat Ad-  
vanced Setup Step 8 to ‘‘d’’ or ‘‘dl’’ unless specifically rec-  
ommended for the application.  
Off/On  
Reversing Valve  
Polarity  
O/B  
O
5
6
Electric Heat  
Deadband  
Off/On  
Off  
2
F. Pre-Occupancy Purge Timer (Step 9)  
1 - 6 degrees  
The pre-occupancy purge allows fresh outside air to be brought  
into the space before the Occupied 1 time period. The timer  
limits the amount of time that the purge can operate. The  
timer can be set from 0 to 3 hours with 15-minute intervals.  
The default is 0 hours (disabled).  
Forced Minimum  
7
0 - 6 degrees  
2
Temperature Difference  
8
9
Cycles per Hour  
Fan Purge Timer  
d, d1, 2 - 6  
0:00 - 3:00  
Off/On  
6
0:00  
On  
10  
Thermoglow™ Backlight  
Reset Service  
Filter Icon  
11  
G. Backlight Display (Step 10)  
The display backlight can be set to ON (always on) or OFF  
Service Filter  
Run Time  
1
2
0-1950 hrs  
500 hrs  
(turn off 8 seconds after usage). The default is ON.  
1
3
4
Soft Start  
0 - 99  
F/C  
0
F
0
H. Service Filter (Steps 11 and 12)  
1
Temperature Units  
Security Level  
Step 11 allows the user to reset the Service Filter counter to  
zero and remove the ‘‘SERVICE FILTER’’ icon (if displayed  
on the thermostat screen). Press the FAN button while in Setup  
Step 11 and the counter is reset to zero. Press the Mode but-  
ton to adjust the number of hours the blower will run before  
the ‘‘SERVICE FILTER’’ icon is displayed. The range is 0 to  
15  
0 - 3  
Maximum Allowable  
Heat Set Point  
35 - 99 F  
(1 to 37 C)  
1
6
7
80 F (27 C)  
65 F (18 C)  
Minimum Allowable  
Cooling Set Point  
35 - 99 F  
(1 to 37 C)  
1
*Accessed and configured through the Set Clock button.  
1
950 hours. Set the variable to 0 to disable this function. The  
default is 500 hours.  
4—  
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Security Minimum Cool Set Point (Step 17)  
If the Security Level is not set to 0, the minimum cooling set  
point will be in effect. The user will not be allowed to set the  
cooling set point below the specified value. The range of val-  
ues is 35 to 99 F (1 to 37 C). The default is 65 F (18 C).  
VI. INSTALL ACCESSORIES  
The following accessories can be used with this thermostat:  
remote temperature sensor (TSTATBBPACC-WB)  
outdoor temperature sensor (TSTATBBPACC-01)  
Add-a-Wire™ accessory (TSTATBBPACC-AW)  
Refer to the accessory installation instructions for each ac-  
cessory for more information.  
Fig. 5 — Setting Occupied 1 Set Points  
3
4
5
. The heating set point for Occupied 1 will be displayed.  
Use the UP ARROW and DOWN ARROW buttons to  
raise or lower the heating set point until the desired  
temperature is shown. The range of acceptable values  
is 35 to 99 F (1 to 37 C). Press the Mode button to con-  
tinue. See Fig. 5.  
A. Remote Temperature Sensor  
A remote temperature sensor may be provided to read the  
temperature from a space. If a remote temperature sensor is  
connected, the thermostat will ignore the reading of its in-  
ternal sensor. When the thermostat is using a reading from a  
remote sensor, the degree symbol above the temperature read-  
ing will blink.  
. The cooling set point for Unoccupied will be displayed.  
Use the UP ARROW and DOWN ARROW buttons to  
raise or lower the cooling set point until the desired  
temperature is shown. The range of acceptable values  
is 35 to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied cool-  
ing). Press the Mode button to continue.  
VII. PROGRAM THERMOSTAT SCHEDULES  
Before programming the thermostat, plan the thermostat daily  
schedule. The schedule is divided into 7 days (Monday  
through Sunday). Each day has from 2 to 4 time periods  
. The heating set point for Unoccupied will be dis-  
played. Use the UP ARROW and DOWN ARROW but-  
tons to raise or lower the heating set point until the  
desired temperature is shown. The range of acceptable  
values is 35 to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied  
heating). Press the Mode button to continue.  
(Occupied 1, Occupied 2, Occupied 3, Unoccupied) depending  
on the configuration of the thermostat. Each occupied time  
period has a start time, stop time, heating set point, and cool-  
ing set point. The unoccupied time period has a heating set  
point and a cooling set point. The unoccupied time period is  
active when ever an occupied time period is not active. Fill in  
Table 3 as an aid to programming the daily schedules.  
6
7
. The day of the week will be shown. Use the UP AR-  
ROW and DOWN ARROW buttons to change the day  
of the week until the desired starting day is shown.  
Possible choices are M (Monday) through S (Sunday).  
Press the Mode button when the desired day is shown.  
NOTE: When the sensor detects light (the space is occupied),  
the thermostat will enter Occupied 1 mode. If the room is  
dark, the thermostat will follow its programmed schedule. The  
Occupied 1 schedule should be turned OFF to keep the ther-  
mostat from entering Occupied 1 while the room is unoccu-  
pied. If the Occupied 1 schedule is turned ON, the thermo-  
stat will enter Occupied 1 per the schedule regardless of light  
activation. The Occupied 1 set points are used as the heating  
and cooling set points during light activation. The Unoccu-  
pied set points should be used as non-work hour set points  
. The Start Time for Occupied 1 will be displayed. Use  
the UP ARROW and DOWN ARROW buttons to raise  
or lower the time until the desired Start Time is shown.  
Press the Mode button to continue. See Fig. 6.  
8. The Stop Time for Occupied 1 will be displayed. Use  
the UP ARROW and DOWN ARROW buttons to raise  
or lower the time until the desired Stop Time is shown.  
Press the Mode button to continue.  
(before 8:00 AM and after 5:00 PM) when using light activa-  
tion. For times when the building is unoccupied during work  
hours (Monday through Friday, 8:00 AM to 5:00 PM), the Oc-  
cupied 2 schedule should be turned ON, and can be used for  
moderate energy savings with set points of 80 F for cooling  
and 65 F for heating.  
9
. The On/Off icon will be displayed. Use the UP ARROW  
to turn the Occupied 1 period ON for this day. Use the  
DOWN ARROW to turn the Occupied 1 period OFF for  
this day.  
A. Programming Mode  
10. Repeat Steps 2 through 9 to program the remaining  
schedule for Occupied periods 2 and 3.  
To program the daily schedules, perform the following  
procedure:  
1
. Enter programming mode by pressing the Program but-  
ton. The Occupied 1 annunciator will appear on the ther-  
mostat display. Use the UP ARROW and DOWN AR-  
ROW buttons to set the maximum number of Occupied  
periods for each day. The thermostat can be set to 1, 2,  
or 3. After the number of Occupied periods has been  
selected, press the Mode button. See Fig. 5.  
2
. The cooling set point for Occupied 1 will be displayed.  
Use the UP ARROW and DOWN ARROW buttons to  
raise or lower the cooling set point until the desired  
temperature is shown. The range of acceptable values  
is 35 to 99 F (1 to 37 C). Press the Mode button to con-  
tinue. See Fig. 5.  
Fig. 6 — Start Time Display  
5—  
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1
1. The Copy command can be used to copy the previous  
day’s schedule if the schedules are the same. The copy  
command becomes available after all the occupied pe-  
riods are programmed in a day. Use the UP ARROW to  
change the copy command to YES. Use the DOWN AR-  
ROW to change the copy command to NO. Press the  
Mode button when the choice has been made. See  
Fig. 7.  
3. Use an accurate thermometer to measure room tem-  
perature. Press the UP or DOWN ARROW buttons un-  
til the flashing number equals room temperature.  
4
. Press the Mode button to return to normal operation.  
IX. LIGHT SENSOR ADJUSTMENT  
The light sensor is used for light-activated operation. The sen-  
sor can be adjusted for a variable degree of sensitivity. The  
sensitivity adjustment screw is located on the inner cover of  
the thermostat, near the DOWN ARROW button. Turning the  
screw clockwise increases the sensitivity of the sensor to light.  
Turning the screw counterclockwise decreases the sensitivity  
of the sensor to light.  
If NO was selected, the schedule will automatically  
change to the next day and the user must enter the oc-  
cupied and unoccupied schedules for that day.  
NOTE: Occupied 1 schedule heating and cooling set points  
are the same for each day. Occupied 2 and 3 set points may  
be set to different values for each day of the week.  
To check for correct sensitivity, place the thermostat in Pro-  
gram On mode. The thermostat should be in Occupied 1 when  
the lights are on. If the sensor does not enter Occupied 1 while  
the lights are on, turn the screw clockwise until the Occu-  
pied 1 icon appears on the display. The thermostat should  
enter Unoccupied mode when the lights are off. If the sensor  
does not enter Unoccupied when the lights are turned off, turn  
the screw counterclockwise until the Unoccupied icon ap-  
pears on the display.  
If YES was selected, the schedule will be copied to the  
next day. The schedule copy may be repeated until Sun-  
day is reached. The Sunday schedule cannot be copied  
to Monday.  
1
2. After all the times and set points for each day have  
been entered, press the Program button to exit pro-  
gramming mode.  
IMPORTANT: An external device should not be used with the  
dry contact switch with light activated operation. The light  
sensor is wired to the dry contact switch. Another device will  
cause conflicting signals to the thermostat. The RED wire of  
the sensor is wired to CK1. The BLACK wire of the sensor is  
wired to CK2.  
X. CHECK THERMOSTAT OPERATION  
To check thermostat operation, perform the following  
procedure:  
Fig. 7 — Copy Command Display  
NOTE: The thermostat will continue to follow the schedule  
until a new one is entered.  
1
. Press the Mode button repeatedly until the Heat icon  
appears on the display. The thermostat is now in Heat-  
ing mode.  
If only one occupied schedule is selected, the Occupied 2 and  
3
schedules are skipped. If the start time is set later in the  
2
. Press the Fan button. The Fan Auto icon will appear on  
the display screen. Press the UP ARROW button until  
the heating set point is 10 F (6 C) higher than the cur-  
rent room temperature. Heating and fan should be  
energized.  
day than the stop time, the program will run from midnight  
of that day to the stop time and then from the start time to  
midnight. If the same start and stop times are programmed  
for an occupancy schedule, the thermostat will be in Occu-  
pied mode for 24 hours. If one occupied period starts or stops  
within another occupied period, the lower numbered sched-  
ule has priority. For example, if schedule Occupied 3 is run-  
ning for 24 hours and Occupied 2 schedule comes on from 1  
to 3 PM, the set points from Occupied 2 are in effect from 1 to  
3
. Press the Mode button repeatedly until the Cool icon ap-  
pears on the display. The thermostat is now in Cooling  
mode.  
4. Press the DOWN ARROW button until the cooling set  
point is 10 F lower than the current room temperature.  
Cooling and fan should be energized.  
3
PM.  
B. Overriding the Schedule  
5
. Press the Mode button repeatedly until the Off icon ap-  
pears. Press the Fan button until the display reads Fan  
On. The fan should energize.  
The schedule can be overridden by pressing the UP or DOWN  
ARROW buttons to change the desired temperature. The ther-  
mostat will use the new set point until the next scheduled  
time period starts.  
6
. If heating, cooling, or fan operation do not energize, check  
wiring and consult Table 4.  
VII. CALIBRATE TEMPERATURE SENSOR  
XI. FINAL CHECKLIST  
Every thermostat is factory calibrated. Under normal circum-  
stances there will never be a need to re-calibrate the ther-  
mostat. If re-calibration must be done, perform the following  
procedure:  
1
. Put away tools and instruments. Clean up debris and  
packaging.  
2. Review Owner ’s Guide with occupant or owner.  
3. Leave the manuals with owner.  
1
. Hold down the Mode and Fan buttons for 5 seconds. All  
of the icons on the display screen will appear. Release  
the buttons. Press the UP and DOWN ARROW buttons  
simultaneously.  
2
. Press the UP and DOWN ARROW buttons simulta-  
neously again. The current temperature will be  
displayed.  
6—  
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Table 3 — Daily Schedule Planner  
SCHEDULE  
Occupied 2  
DAY  
OF THE  
WEEK  
Occupied 1  
Occupied 3  
Unoccupied  
Start / Stop / Heat / Cool  
Start / Stop / Heat / Cool  
Start / Stop / Heat / Cool  
Heat / Cool  
Monday  
Tuesday  
Wednesday  
Thursday  
Friday  
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
Saturday  
Sunday  
NOTE: The cooling temperature set point must be higher than the heating temperature set point. (The temperature difference may be changed in the  
advanced setup configuration.)  
OPERATION  
The fan will be off during unoccupied schedule except during  
heating or cooling operation.  
The Mode button selects the operating mode of the thermo-  
stat. If OFF is selected, the thermostat will not enter Heat-  
ing or Cooling mode. If HEAT is selected, the thermostat will  
only enter Heating mode (if the room temperature is below  
the heating set point). If COOL is selected, the thermostat  
will only enter Cooling mode (if the room temperature is above  
the cooling set point). If AUTO is selected, the thermostat will  
enter Heating or Cooling mode based on the room tempera-  
ture and the heating and cooling set points. If PROGRAM  
ON is selected, the stored schedule is enabled and the ther-  
mostat will follow the Occupied and Unoccupied schedules  
stored in its memory.  
If Fan On is not selected, the fan will only operate during  
heating or cooling operation.  
VI. EMERGENCY HEAT  
Emergency heat is available for heat pump applications. To  
turn on emergency heat, press and hold the Fan button. While  
holding the Fan button, press the UP button for 2 seconds.  
An ‘‘EH’’ will be displayed. During emergency heat, the fan  
will operate and the second stage of heat will be energized  
(locking out the first stage compressor). To exit emergency  
heat, press and hold the Fan button. While holding the Fan  
button, press the UP button for 2 seconds. During emergency  
heat, only OFF and HEAT modes are available.  
I. AUTO-CHANGEOVER  
When the thermostat mode is set to AUTO, the thermostat  
will provide automatic changeover from Heating to Cooling  
mode and Cooling to Heating mode when required. The ther-  
mostat will automatically switch to maintain the desired tem-  
perature setting. The thermostat does not need to be manu-  
ally changed from heating to cooling or cooling to heating  
operation.  
VII. ELECTRIC HEAT  
When the Electric Heat option in the advanced setup is set  
to ON (configured by installer), the thermostat will turn on  
the fan immediately any time there is a heat demand. This  
feature should only be used on electric heating applications.  
Do not use with gas heat.  
II. LIGHT-ACTIVATED OPERATION  
VIII. HOLIDAY MODE  
A light sensor is provided on the thermostat for light activa-  
tion. The thermostat must be in Program On mode for light  
activation to be initiated. When the sensor detects light (the  
space is occupied), the thermostat will enter Occupied 1 mode  
and heat or cool according to the Occupied 1 set points. If  
the room is dark, the thermostat will follow its programmed  
schedule.  
When the thermostat is in Holiday mode, the thermostat will  
operate under Unoccupied set points. To configure and acti-  
vate the Holiday mode, press the Holiday button. The ‘‘HOL’’  
icon will be displayed along with the remaining days of Holi-  
day mode operation. Press the UP or DOWN ARROWS to se-  
lect the number of days that the holiday schedule will be in  
effect. A value of 0 disables Holiday mode. The duration can  
be set from 1 to 99 days. The thermostat will enter Holiday  
mode on midnight of the next day after the mode has been  
activated. Holiday mode will remain in effect until midnight  
of the last configured day.  
NOTE: Light activation does not work in Holiday mode.  
III. TWO-STAGE OPERATION  
The second stage of heat or cool is turned on when the first  
stage has been on for a minimum of 2 minutes and the tem-  
perature differential from the set point is equal to or greater  
than the set point plus the deadband plus 2 degrees.  
If the Holiday mode is in effect, the number of days remain-  
ing will blink on and off and the ‘‘Unoccupied’’ icon will be  
displayed. The Override button will be active during Holiday  
mode. The Dry Contact Switch is ignored.  
IV. CLOCK BACKUP  
To turn off the Holiday mode before the remaining config-  
ured days have passed, press the Holiday button to enter into  
the Configuration mode. Press the DOWN ARROW to set the  
number of days to zero. Holiday mode will be  
disabled.  
In the event of a power loss, the thermostat will keep time  
for a minimum of 48 hours without external power or  
batteries.  
V. FAN OPERATION  
If Fan On is selected, the fan will run continuously during  
occupied schedule (except when Mode is switched to OFF).  
7—  
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IX. REMOTE TEMPERATURE SENSOR  
keypad, press and hold the Mode button. While holding  
down the Mode button, press the UP and DOWN ARROW  
buttons simultaneously. The ‘‘Locked’’ icon will appear on  
the display.  
A remote temperature sensor is available to read the tem-  
perature from a space. If a remote temperature sensor is  
connected, the thermostat will ignore the reading of its in-  
ternal sensor. When the thermostat is using a reading from  
a remote sensor, the degree symbol above the tempera-  
ture reading will blink.  
The thermostat is unlocked by performing the same pro-  
cedure. Press and hold the Mode button. While holding down  
the Mode button, press the UP and DOWN ARROW but-  
tons simultaneously. The ‘‘Locked’’ icon will be removed from  
the display.  
X. KEYPAD LOCK  
To prevent unauthorized use of the thermostat, the front  
panel buttons can be disabled. To disable or lock the  
TROUBLESHOOTING  
For thermostat troubleshooting see Table 4 below.  
Table 4 — Thermostat Troubleshooting  
PROBLEM  
Display on thermostat not illuminated.  
SOLUTION  
Check for 24 vac at the R terminal connection. Terminal R must be  
connected for proper thermostat operation.  
‘‘Service Filter’’ is displayed on thermostat.  
After the configured number of blower operating hours, the Service  
Filter message will be displayed. This reminds the owner to re-  
place the filter. Reset the Service Filter feature to reset the blower  
operation timer to 0 hours.  
Cooling will not energize.  
Heating will not energize.  
Select COOL mode. Decrease cooling set point to 10 degrees be-  
low room temperature. Check for 24 vac at Y1 terminal. If present,  
thermostat is operating correctly and problem is with wiring or equip-  
ment. If 24 vac is not present, replace the thermostat. Check for  
Compressor Cycle per Hour Limit. Cooling may be locked out.  
Select HEAT mode. Increase heating set point to 10 degrees above  
room temperature. Check for 24 vac at W1/O/B terminal. If present,  
thermostat is operating correctly and problem is with wiring or equip-  
ment. If 24 vac is not present, replace the thermostat.  
When using 4 wires (R,G,W,Y), the cooling equip-  
ment tries repeatedly to turn on, but cannot. At  
times the display dims or disappears.  
There is not enough power available. Connect a 270 ohm, 10 watt  
power resistor at the air-conditioning equipment between terminals  
W and C (non-heat pump applications only).  
When using 4 wires (R,G,W,Y), the heating equip-  
ment tries repeatedly to turn on, but cannot. At  
times the display dims or disappears.  
There is not enough power available. Connect a 270 ohm, 10 watt  
power resistor at the air-conditioning equipment between terminals  
Y and C (non-heat pump applications only).  
When controlling a heat pump, heat comes on  
during cooling cycle.  
Configure thermostat for heat pump operation (Table 2, Step 3).  
When calling for cooling, both heating and cool-  
ing are energized.  
The thermostat is configured for a heat pump. Configure the ther-  
mostat for non-heat pump operation (Table 2, Step 3).  
When controlling a commercial heat pump unit,  
unit runs in reverse or heating is always on.  
Commercial heat pumps require that Heat Pump Option on ther-  
mostat is turned OFF.  
Copyright 1998 Bryant Heating & Cooling Systems  
Printed in U.S.A.  
CATALOG NO. 809-684