installation, start-up and
service instructions
TEMPSURE COMMERCIALTHERMOSTA T
(P/N TSTATBBP220-LA)
Cancels: New II TSTAT-8
11/1/98
CONTENTS
Page
SAFETY CONSIDERATIONS ...................... 1
GENERAL ..................................... 1
INSTALLATION ................................ 1-6
I. Select Thermostat Location ................ 1
II. Install Thermostat ........................ 2
III. Set Clock ................................ 3
IV. Heat Pump Configuration .................. 3
V. Configure Advanced Setup ................. 3
VI. Install Accessories ........................ 4
VII. Program Thermostat Schedules ............. 4
VIII. Calibrate Temperature Sensor .............. 6
IX. Light Sensor Adjustment .................. 6
X. Check Thermostat Operation ............... 6
XI. Final Checklist ........................... 6
OPERATION ................................... 7
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. Keypad Lock ............................. 7
TROUBLESHOOTING ............................ 8
IMPORTANT: Read entire instructions before starting the
installation.
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 wiring or installation may damage thermostat.
Recognize safety information. This is the safety alert sym-
. When the safety alert symbol is present on equip-
bol
ment or in the instruction manual, be alert to the potential
for personal injury.
Understand the signal wordsDANGER,WARNING, and CAUTION. These words are used with the safety alert symbol.
DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death.
CAUTION is used to identify unsafe practices which would
result in minor personal injury or property damage.
GENERAL
The 7-day, commercial, programmable thermostats are wallmounted, low-voltage thermostats which maintain room temperature by controlling the operation of an HVAC (heating,
ventilation, and air-conditioning) system. Separate heating
and cooling 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.
NOTE: The thermostat is not factory-configured for use in
heat pump applications. The advanced setup must be performed to configure the thermostat for use with heat pump
units.
A light sensor is provided on the thermostat for light
activation. 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
• close to or in a frequently used room, preferably on an inside partitioning wall
• 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% relative humidity, non-condensing
The thermostat should NOT be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• 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)
II. INSTALL THERMOSTAT
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.
1. Turn off all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from the wall.
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.
c. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and must be disposed
of properly.
3. Remove the thermostat cover from wall plate (mounting 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.Pulloff the cover when the prongs
have been disengaged.
4. Route thermostat wires through large hole in mounting base. Remove outer sheath from wires for added
flexibility. Standard solid or multi-conductor thermostat wire should be used from the thermostat to the
unit. Size and length considerations are as fol-
lows: for a maximum distance from unit of 36 ft,
use 22AWG(American Wire Gage) wire; for a maximum distance from unit of 100 ft, use 18AWGwire.
5. Level mounting base against wall and mark wall through
the 2 mounting holes in base.
3
6. Drill two
⁄16-in. mounting holes in wall where marked.
7. Secure mounting base to wall with 2 screws and
anchors provided. Ensure all wires exit through hole
in mounting base.
8. Adjust wire length and routing to allow proper closure
of the thermostat. Strip each wire at the end no more
1
⁄4-in. to prevent adjacent wires from shorting to-
than
gether. Match and connect wires to terminals on the
thermostat. See Fig. 2-4 and Table 1.
CAUTION:
Improper wiring or installation may cause
damage to the thermostat. Check to ensure wiring is
correct before proceeding with installation of unit.
9. Push excess wiring into wall. Seal hole in wall to prevent drafts.
10. 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.
11. Turnon 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 cooling), and G (fan relay) will always be connected. Some
applications will use C (common),Y2 (second stage cooling), or W2 (second stage heating).
WARNING:
Be careful not to drill into wiring in wall.
Electrical shock could result.
Fig. 1 — Thermostat Mounting
W2 — Second-Stage
Y2 — Second-Stage
RS2 — Not Used
RS+5 — Not Used
RS1 — Not Used
RS
GND
Heat
Compressor
— Not Used
Fig. 2 — Thermostat Wiring
LEGEND
W1/O/B — First-Stage Heat or
Y1 — First-Stage Compressor
G—Fan
W3/ECO — Third-Stage Heat or
CK1 — Not Used
CK2 — Not Used
R—24 vac Transformer
C—24 vac Transformer
Reversing Valve
Economizer (Not Used)
Common
—2—
THERMOSTAT
W2Y2R
O
W1
B
G
C
Y1
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT CIRCUIT
24 VAC RETURN
2nd STAGE HEAT CIRCUIT
TYPICAL
UNIT
L
E
C
G
Y1
O
W1
R
Y2
W2
Fig.3—Typical Wiring (Single-Stage Cooling Units)
THERMOSTAT
W2Y2R
B
O
W1
Y1
G
C
24 VAC COMMON
COMPRESSOR RELAY
1st STAGE HEAT CIRCUIT
24 VAC RETURN
2nd STAGE COMPRESSOR RELAY
2nd STAGE HEAT CIRCUIT
FAN RELAY
TYPICAL
UNIT
L
E
C
G
Y1
O
W1
R
Y2
W2
Fig.4—Typical Wiring (Two-Stage Cooling Units)
Table 1 — Thermostat Wiring Terminations
EXISTING
WIRE
DESIGNATION
GorF Fan G
Y1, Y, or C Cooling Y1
W1, W, or H Heating W1/O/B
Rh, R, M, Vr, or A Power (24 v) R
C Common C*
O/B Reversing Valve W1/O/B†
Y2 Second Stage Cooling Y2*
W2 Second Stage Heating W2*
*Terminals C, W2, and Y2 may not be used in all applications.
†Used on Heat Pump applications only.
FUNCTION
TERMINAL
CONNECTION
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 UPARROW
and DOWN ARROW buttons until the correct time is shown.
Hold down the buttons to quickly move through the time display. The AM and PM annunciators will automatically change.
Hold down the Fan button while pressing UP ARROW or
DOWN ARROW to change the time by hours instead of minutes. 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, Advanced Setup Steps 3 (Heat Pump Operation) and 4 (Reversing Valve Polarity) must be configured correctly. See the
Configure Advanced Setup section for information on configuring 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.
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
corner of the thermostat screen. Use the Mode button to
advance through the steps. There are 15Advanced Setup Steps.
See Table2. Press the Program button at any time to exit the
Advanced Setup mode.
NOTE: Advanced Setup Steps 1 and 2 are configured with
the Set Clock button, and are not accessed through the
advanced setup screens.
A. Heat Pump Configuration (Steps 3 and 4)
T oset 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 variable 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.’’
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.
Table 2 — Advanced Setup Configuration
STEP DESCRIPTION RANGE DEFAULT
1* Time of Day
2* Day of the Week
3 Heat Pump Off/On Off
4
5 Electric Heat Off/On Off
6 Deadband 1 - 6 degrees 2
7
8 Cycles per Hour d, d1,2-6 6
9 Thermoglow™ Backlight Off/On On
10
11
12 Temperature Units F/C F
13 Security Level 0 - 3 0
14
15
*Accessed and configured through the Set Clock button.
Reversing Valve
Polarity
Forced Minimum
Temperature Difference
Reset Service
Filter Icon
Service Filter
Run Time
Maximum Allowable
Heat Set Point
Minimum Allowable
Cooling Set Point
12:00 AM -
11:59 PM
Sunday through
Saturday
O/B O
0 - 6 degrees 2
——
0-1950 hrs 500 hrs
35 - 99 F (1-37 C) 80 F (27 C)
35 - 99 F (1-37 C) 65 F (18 C)
12:00 AM
Monday
—3—
B. Electric Heat Configuration (Step 5)
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.
C. Deadband (Step 6)
The deadband is the difference in temperature above the
cooling set point or below the heating set point that the thermostat 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 during Auto-Changeover and Program On operation.
E. Cycles Per Hour Limit (Step 8)
The number of times that heating or cooling can be energized per hour can be configured. Set the variable to ‘‘d’’ for
no limit. Set the variable to ‘‘d1’’to disable the 5-minute compressor lockout. The variable can also be set from 2 to 6 cycles
per hour. The default is 6 cycles per hour.
CAUTION:
5-minute compressor lockout is disabled or compressor
is allowed unlimited cycles. Do not set thermostat
Advanced Setup Step 8 to ‘‘d’’ or ‘‘dl’’ unless specifically
recommended for the application.
F. Backlight Display (Step 9)
The display backlight can be set to ON (always on) or OFF
(turn off 8 seconds after usage). The default is ON.
G. Service Filter (Steps 10 and 11)
Step 10 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 FANbutton while in Setup
Step 10 and the counter is reset to zero. Press the Mode button to adjust the number of hours the blower will run before
the ‘‘SERVICE FILTER’’ icon is displayed. The range is 0 to
1950 hours. Set the variable to 0 to disable this function. The
default is 500 hours.
H. Fahrenheit/Celsius Operation (Step 12)
The thermostat can be set to operate in Fahrenheit or Celsius degrees. Set the variable to ‘‘F’’ for Fahrenheit operation. Set the variable to ‘‘C’’for Celsius operation. The default
is ‘‘F.’’
I. Security Level (Steps 13 to 15)
The Security Level limits the actions that the user can perform 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 14 and 15. When the security level is
set to ‘‘2,’’ the set point range is limited by the settings of
Steps 14 and 15 and the Program On mode is always in effect. When the security level is set to ‘‘3,’’ the set point range
is limited by the settings of Steps 14 and 15, the Program On
mode is always in effect, and set point changes are prohibited. The default is 0.
Damage to compressor could result if
Security Maximum Heat Set Point (Step 14)
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).
Security Minimum Cool Set Point (Step 15)
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 values is 35 to 99 F (1 to 37 C). The default is 65 F (18 C).
VI. INSTALL ACCESSORIES
The following accessory can be used with this thermostat:
Add-a-Wire™ accessory (TSTATBBPACC-AW).
Refer to the accessory installation instructions for the accessory for more information.
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 (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 cooling 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.
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
thermostat from entering Occupied 1 while the room is unoccupied. If the Occupied 1 schedule is turned ON, the thermostat 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
Unoccupied set points should be used as non-work hour set
points (before 8:00 AM and after 5:00 PM) when using light
activation. For times when the building is unoccupied during
work hours (Monday through Friday, 8:00 AM to 5:00 PM),
the Occupied 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.
A. Programming Mode
To program the daily schedules, perform the following
procedure:
1. Enter programming mode by pressing the Program button. The Occupied 1 annunciator will appear on the thermostat display. Use the UP ARROW and DOWN
ARROW 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 continue. See Fig. 5.
—4—
Table 3 — Daily Schedule Planner
DAY
OF THE
WEEK
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.)
Occupied 1 Occupied 2 Occupied 3 Unoccupied
Start / Stop / Heat / Cool Start / Stop / Heat / Cool Start / Stop / Heat / Cool Heat / Cool
SCHEDULE
Fig. 5 — Setting Occupied 1 Set Points
3. 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 continue. See Fig. 5.
4. 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 cooling). Press the Mode button to continue.
5. The heating set point for Unoccupied 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) or ‘‘OF’’(no unoccupied
heating). Press the Mode button to continue.
6. The day of the week will be shown. Use the UP
ARROW 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.
7. 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.
Fig. 6 — Start Time Display
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.
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.
10. Repeat Steps 2 through 9 to program the remaining
schedule for Occupied periods 2 and 3.
11. 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
periods are programmed in a day. Use the UP ARROW
to change the copy command to YES. Use the DOWN
ARROW to change the copy command to NO. Press the
Mode button when the choice has been made. See
Fig. 7.
If NO was selected, the schedule will automatically
change to the next day and the user must enter the occupied 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.
If YES was selected, the schedule will be copied to the
next day. The schedule copy may be repeated until Sunday is reached. The Sunday schedule cannot be copied
to Monday.
—5—
Fig. 7 — Copy Command Display
12. After all the times and set points for each day have
been entered, press the Program button to exit programming mode.
NOTE: The thermostat will continue to follow the schedule
until a new one is entered.
If only one occupied schedule is selected, the Occupied 2 and
3 schedules are skipped. If the start time is set later in the
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 Occupied mode for 24 hours. If one occupied period starts or stops
within another occupied period, the lower numbered schedule has priority. For example, if schedule Occupied 3 is running for 24 hours and Occupied 2 schedule comes on from
1 to 3 PM, the set points from Occupied 2 are in effect from
1to3PM.
B. Overriding the Schedule
The schedule can be overridden by pressing the UP or DOWN
ARROW buttons to change the desired temperature. The thermostat will use the new set point until the next scheduled
time period starts.
VIII. CALIBRATE TEMPERATURE SENSOR
Every thermostat is factory calibrated. Under normal circumstances there will never be a need to re-calibrate the thermostat. If re-calibration must be done, perform the following
procedure:
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 simul-
taneously again. The current temperature will be
displayed.
3. Use an accurate thermometer to measure room tem-
perature. Press the UP or DOWN ARROW buttons until the 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 sensor can be adjusted for a variable degree of sensitivity. The
sensitivity adjustment screw is located on the inner cover of
the thermostat, near the DOWNARROW button. Turning the
screw clockwise increases the sensitivity of the sensor to light.
Turningthe screw counterclockwise decreases the sensitivity
of the sensor to light.
To check for correct sensitivity, place the thermostat in Program 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 Occupied 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
appears on the display.
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:
1. Press the Mode button repeatedly until the Heat icon
appears on the display. The thermostat is now in Heating mode.
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 current room temperature. Heating and fan should be
energized.
3. Press the Mode button repeatedly until the Cool icon
appears 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.
5. Press the Mode button repeatedly until the Off icon
appears. Press the Fan button until the display reads
Fan On. The fan should energize.
6. If heating, cooling, or fan operation do not work, check
wiring and consult Table 4.
XI. FINAL CHECKLIST
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.
—6—
OPERATION
The Mode button selects the operating mode of the thermostat. If OFF is selected, the thermostat will not enter Heating 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). IfAUTO is selected, the thermostat will
enter Heating or Cooling mode based on the room temperature and the heating and cooling set points. If PROGRAM
ON is selected, the stored schedule is enabled and the thermostat will follow the Occupied and Unoccupied schedules
stored in its memory.
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
thermostat will automatically switch to maintain the desired
temperature setting. The thermostat does not need to be manually changed from heating to cooling or cooling to heating
operation.
II. LIGHT-ACTIVATED OPERATION
A light sensor is provided on the thermostat for light activation. 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.
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 temperature differential from the set point is equal to or greater
than the set point plus the deadband plus 2 degrees.
IV. CLOCK BACKUP
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).
The fan will be off during unoccupied schedule except during
heating or cooling operation.
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.
VII. ELECTRIC HEAT
When the Electric Heat option in the advanced set up 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.
VIII. HOLIDAY MODE
When the thermostat is in Holiday mode, the thermostat will
operate under Unoccupied set points. To configure and activate the Holiday mode, press the Holiday button. The ‘‘HOL’’
icon will be displayed along with the remaining days of Holiday mode operation. Press the UP or DOWN ARROWS to select 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.
If the Holiday mode is in effect, the number of days remaining will blink on and off and the ‘‘Unoccupied’’ icon will be
displayed. The Override button will be active during Holiday
mode.
To turn off the Holiday mode before the remaining configured 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.
IX. KEYPAD LOCK
To prevent unauthorized use of the thermostat, the front panel
buttons can be disabled. To disable or lock the 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.
The thermostat is unlocked by performing the same procedure. Press and hold the Mode button. While holding down
the Mode button, press the UP and DOWN ARROW buttons
simultaneously. The ‘‘Locked’’ icon will be removed from the
display.
—7—
TROUBLESHOOTING
Table 4 — Thermostat Troubleshooting
PROBLEM SOLUTION
Display on thermostat not illuminated. Check for 24 vac at the R terminal connection. Terminal R must
‘‘Service Filter’’ is displayed on thermostat. After the configured number of blower operating hours, the Service
Cooling will not energize. Select COOL mode. Decrease cooling set point to 10 degrees
Heating will not energize. Select HEATmode. Increase heating set point to 10 degrees above
When using 4 wires (R,G,W,Y), the cooling equipment tries repeatedly to turn on, but cannot. At
times the display dims or disappears.
When using 4 wires (R,G,W,Y), the heating equipment tries repeatedly to turn on, but cannot. At
times the display dims or disappears.
When controlling a heat pump, heat comes on
during cooling cycle.
When calling for cooling, both heating and cooling are energized.
When controlling a commercial heat pump unit,
unit runs in reverse or heating is always on.
be connected for proper thermostat operation.
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.
below room temperature. Check for 24 vac at Y1 terminal. If present,
thermostat is operating correctly and problem is with wiring or equipment. If 24 vac is not present, replace the thermostat. Check for
Compressor Cycle per Hour Limit. Cooling may be locked out.
room temperature. Check for 24 vac at W1/O/B terminal. If present,
thermostat is operating correctly and problem is with wiring or equipment. If 24 vac is not present, replace the thermostat.
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).
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).
Configure thermostat for heat pump operation (Table 2, Step 3).
The thermostat is configured for a heat pump. Configure the
thermostat for non-heat pump operation (Table 2, Step 3).
Commercial heat pumps require that Heat Pump Option on
thermostat is turned OFF.
Copyright 1998 Bryant Heating & Cooling Systems CATALOG NO. 809-683
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