Bryant OM TSTAT-1, OM TSTAT-51 User Manual
user’s information
manual
COMMERCIAL THERMOSTAT
(P/N TSTATBBPCM01-B)
Cancels: OM TSTAT-1 OM TSTAT-5 1
9/15/99
IMPORTANT: Read entire instru ctions before programming
the thermostat.
GENERAL
Bryant’s 7-day, commercial, prog rammable thermostats are
wall-mounted, 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 schedules
for energy savings.
All thermostats allow up to 4 time and temperature settings
to be programmed per 24-hr period. Each thermostat stores
programs for 7 independent days. Batteries are not required.
During power interruption the interna l memory stores programs for an unlimited time.
OPERATION
I. THERMOSTAT DISPLAY
The thermostat display is located in the top center of the
thermostat. See Fig. 1. The following information can be displayed on the screen:
• mode (OFF, EHEAT, COOL, AUTO, or HEAT)
• fan setting (ON or AUTO)
•hold status
• room temperature
• desired temperature
• clean filter status
• time of day
• day of the week
• schedule period (OC1, UN1, OC2, or UN2)
• outdoor temperature (optiona l)
II. THERMOSTAT PROGRAMMING BUTTONS AND
OPERATION
The thermostat has programming buttons which are used to
change the set points of the thermostat, set the modes, and
program schedules. The programming buttons are accessible
from underneath the thermostat cover. To access the programming buttons, pull on the hinged thermostat cover. See
Fig. 2. The programming buttons are: Copy Previous Day,
Program, Mode, Change Day, End, Fan, Set Time/Temp,
Occupied, and Hold.
The Up and Down buttons are used to change the current,
desired temperature set point and to scroll through programming set points. The Up and Down buttons are accessible
from the outside of the thermostat.
The daily schedule can be overridden in 3 ways: pressing the
Hold button, pressing the Up and Down buttons to change
the temperature set point, or pressing the Occupied button.
A. Programming Button Lockout
The thermostat has a lockout feature which will not
acknowledge pr ogramming button s until the locko ut code is
entered. After the lockout code has been entered, the keypad
will remain unlocked until the user has stopped pressing
buttons for 2 minutes. The lockout feature is configured by
the installer.
NOTE: The lockout code sequence is Mode, Copy Previous
Day, Set Time/Temp, and Hold.
NOTE: The Occupied button is not di sabled by the Lockout
feature.
B. Hold Button Operation
Pressing the Hold button disables the ti me a nd temp erature
schedule and holds the current desired temperature set
point. When a Hold is active, the HOLD annunciator is displayed on the ther mostat screen. T o release the Ho ld, press
the Hold button a second time. The Hold will remain active
indefinitely and the desired temperature will not change
according to the program time or the derived temperature
values. The desired tempera ture can be changed using the
Up and Down buttons.
C. Fan Button Operation
The Fan button selects fan operation. When the fan is set to
ON, the fan will run continuously. When the fan is set to
AUTO, the fan will run during heating and cooling operatio n
only.
If the fan is set to ON, but the Allow Continuous Fan During
Unoccupied Hours config uratio n i s se t to OF , the fan w i ll n ot
run during unoccupied hours when heating or cooling is not
active. A small triangle will be displayed next to the Fan On
icon to show the user that the fan is not running beca use of
the unoccupied time period.
D. Mode Button Operation
The Mode button select s 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 thermosta t
will only enter Cooling mode (if the room temperature is
above the cooling set point). If AUTO is selected, the thermostat will enter Heatin g or Cooling mode based on the room
temperature an d the heating and cooling set poi nts. Units
also have an EHEAT selection which is configured by the
installer. If EHEAT is selected, the unit will use the second
stage of heating to provide heating, if necessary. The annunciator for each selection will be displayed on the thermostat
when selected.
E. Auto-Changeover
When the thermostat mode is set to AUTO, the thermostat
will provide a utomatic changeover f rom Heating to Coo ling
mode and Cooling t o He ating mode when required. The ther mostat 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.
NOTE: It is recommended that auto-changeover mode not be
used if the out door temperature is consist ently lower than
50 F or greater than 80 F. In these cases, select heating or
cooling mode only.
F. Unoccupied Override
The Occupied button is only active during unoccu pied periods. The Occupied button is inactive during occupied periods.
If the thermostat is in unoccupied mode and the user presses
the Occupied button, the set points are changed to t he OC1
set points for heating and cooling. The OC1 icon will flash to
show the user that the thermostat is in override.
The thermostat will remain in override until the next scheduled time period or for the numb er of a llowe d ove rrid e hours
programmed in the thermostat configuration (Option 18)
whichever comes first.
NOTE: If the set points are changed during unoccupied override, the unoccupied 1 (UN1) set points will be changed.
G. Smart Recovery (Heating Mode)
The smart recovery functi on is designed to save energy by
gradually adjusting temperatures to meet scheduled set
points. The thermostat has 2 schedule modes, normal occupied mode and setback mode (a time when the space is unoccupied). The Smart Recovery function begins 1 to 1.5 hours
before the scheduled occupied mode and gradually adjusts
room temperature so the temperature is at the occupied
mode set point when the occupied time period begins.
This is more efficient than making the system run at full
capacity until the desired temperature is met.
NOTE: Smart Recovery does not apply to cooling operation.
III. SET CURRENT DAY
The Change Day button will change the day shown on the
thermostat display to the next day. If a schedule has been
entered, the the rmostat will fo llow the schedule of the new
selected d ay.
IV. SET CURRENT TIME
The Set Time/Temp button allows the user to change the
time displayed on the thermostat. Press the Set Tim e/Temp
button. The TIME annunciator will flash. Press the Up and
Down 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 . To ensure
the schedules are properly followed, make sure that AM or
PM is correct for the time chosen. Whe n the correct time is
shown, press the End button to exit the Set Time mode.
V. RESET FILTER
The Reset Filter function is used to clear the “Clean Filter”
icon on the display screen. The Reset Filter functi on is initiated by pressing the Hold and Occupied buttons simultaneously. The “Clean Filter” ico n reminds th e user whe n it is
time to change or clean the filter of the unit.
VI. PROGRAMMING THERMOSTAT SCHEDULES
Before programming the thermostat, plan the thermostat
daily schedule. The schedule is divided into 7 days (Monday
through Sunday). Each day has 4 time periods (OC1, UN1,
OC2, UN2). Each time period has a s tart time, heating set
point, and cooling set point. Fill in Table 1 on page 4 as an
aid to programming the daily schedules.
When choosing the times for OC1, UN1, OC2, and UN2, the
following rules must be followed:
• The maximum number of hours allowed from OC1 to
UN1, or from OC2 to UN2 i s 12 hours. For example, if
OC1 has a value of 6:00 AM and UN1 had a value of
5:00 PM, this would be acceptable. If however, OC1 has
a value of 6:00 AM and UN 1 ha s a v alu e o f 7: 00 PM, this
would not be acceptable because the difference is greater
than 12 hours.
• The value of UN2 must be greate r than or equal to the
value of OC2, while the value of OC2 must be greater
than or equal to the value of UN1, and the value of UN1
must be greater than or equal to OC1. For example,
acceptable values would be:
OC1UN1 OC2UN2
6:00 AM 5:00 PM 5:00 PM 10:00 PM
In the example above, the thermostat will be occupied from
6:00 AM to 10:00 PM. However, if the f o llowing values were
entered, the thermostat would not be occupied as one may
expect:
OC1 UN1 OC2 UN2
6:00 AM 7:00 PM 6:00 PM 12:00 AM
In the new example, the thermostat will display UN2 from
12:00 AM to 6:00 AM, then OC1 from 6:00 AM to 6:00 PM,
then OC2 from 6:00 PM to 7:00 PM, then UN1 from
7:00 PM to 12:00 AM. The thermostat, in this example,
would be occupied from 6:00 AM to 7:00 PM because OC2
has a value less than the value of UN1.
A. Programming Mode
To program the daily schedules, perform the following
procedure:
1. Enter Programming mode by pressing the Program
button. The PROGRAMMING annunciator will
appear on the thermostat display. The current day of
the schedule will be displayed and the current programming time period of that day will be displayed.
The TIME annunciator will flash.
NOTE: If a programming button is not pushed for 2 minutes,
the thermostat will exit Programming mode and any
changes made will be saved.
2. Press the Up and Down buttons to set the start time
for the schedule day and period shown.
3. Press the Set Time/Temp button once the correct
time is shown. The TIME annunciator will stop flashing and the HEAT annunciator will flash.
4. The heating and cooling set points can now be programmed. The HEAT and COOL annunciators will
flash for the heating and cooling set points respectively. The Set Time/Temp button is used to toggle
between the time, heating, and cooling set points.
Use the Up and Down buttons to raise and lo wer the
temperature set points.
NOTE: There must be at least 2 degrees difference between
the cooling and heating set points. The thermostat will automatically change any set points closer than 2 degrees.
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