Venstar T2900SCH User manual

Venstar Inc. 08/07
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 3 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
Digital
Thermostat
PROGRAMMABLE
up to 3-heat
& 2-cool
Digital
Thermostat
PROGRAMMABLE
up to 3-heat
& 2-cool
SCHOOL THERMOSTAT
T2900SCH
commercial
Energy Saving Operation
Programmable Override
Unoccupied until button press
Perfect for Classroom Operation
Setpoint Limiting Security
Separate Weekend/Weekday
Programs
99 Days of Configuration
Holiday Mode
Morning Warm-up Period
Soft Start Capability
Back-Lit Display
One for All Works with
Virtually All Equipment
Non-Volatile Memory
Keypad Lockout
3 Security Levels
Remote Sensor Ready
48 Hour Clock Backup
Compressor Protection
Economizer Operation
OWNER’S
MANUAL
OWNER’S
MANUAL
Designed Specifically for the School Environment
HEAT
COOL HEAT
PUMP

Page i
NOTE: Due to variations in environmental conditions, it is not
always possible to achieve the desired humidification or
dehumidification setpoint.
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
Follow the Installation Instructions before proceeding.
Set the thermostat mode to “OFF” prior to changing
settings in setup or restoring Factory Defaults.
NEVER PUT MORE THAN ONE
JUMPER ON THE SAME MISC
JUMPER BLOCK!
THIS MAY DAMAGE YOUR
THERMOSTAT AND VOID
YOUR WARRANTY.
CAUTION
C
c
F
FOR HOME OR OFFICE USE
Tested to Comply
with FCC Standards
Thermostat T2900SCH
4Z95
CAUTION
MISC3 MISC3
OK

Page ii
Page 14.1
Section 14 Contents:
Adjusting the Heat/Cool
Differential..............................14.2
Adjusting the Cycles
Per Hour..................................14.3
Adjusting the Deadband..........14.4
Adjusting the Minutes of
Run-Time Before the
Next Stage...............................14.6
Selecting 2nd Stage Turn
Off Temperature.....................14.7
SECTION 14
Timers and Deadbands
14
The first page of each section contains a more detailed list of the contents
within that section, such as the example page shown below.
The Table of Contents divides the thermostat features into sections
making it easier to quickly find information.
In addition, this manual also has an Index to help you find any information
regarding this thermostat quickly.
How to Use This Manual
Header shows section #
and title of section
Section contents
Visible section tab
on the side of the
page
Section and page #

Glossary of Terms
Page iii
Auto-Changeover: A mode in which the thermostat will turn on
the heating or cooling based on room temperature demand.
Configurable Output Jumper: Using jumpers on the thermostat
you can configure the MISC1, MISC2, and MISC3 terminals to
control humidification, dehumidification, 2nd stage cooling, 3rd
stage heating, and a programmable output.
Cool Setpoint: The warmest temperature that the space should
rise to before cooling is turned on (without regards to
deadband).
Deadband: The number of degrees the thermostat will wait, once
setpoint has been reached, before energizing heating or cooling.
Dehumidify: To reduce the amount of moisture in the air.
Differential: The forced temperature difference between the
heat setpoint and the cool setpoint.
Heat Setpoint: The coolest temperature that the space should
drop to before heating is turned on (without regards to
deadband).
Humidify: To increase the amount of moisture in the air.
Icon: The word or symbol that appears on the thermostat
display.
Mode: The current operating condition of the thermostat (i.e. Off,
Heat, Cool, Auto, Program On).
Non-Programmable Thermostat: A thermostat that does not
have the capability of running the Time Period Programming.
Programmable Thermostat: A thermostat that has the capability
of running the Time Period Programming.
Reheat: Running the cooling and 2nd stage strip heaters at the
same time in order to dehumidify the air without cooling down
the room temperature.
Temperature Swing: Same as Deadband.
Time Period Programming: A program that allows the
thermostat to automatically adjust the heat setpoint and/or the
cool setpoint based on the time of day.

2
1
3
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
4
5
Quick Start
Getting to Know Your
Thermostat
Setting Clock and Day
Basic Operation
Viewing Temperature
and Humidity
Programming the
Daily Schedule
Programming the
Fan Operation
Thermostat Display
Options
Humidification
Dehumidification
Viewing Equipment
Run-Times
Electric Heat and
Heat Pump Operation
Timers and Deadbands
Using the
Programmable Output
Programming Remote
Sensor Operation
Dry Contact Operation
Override Timer
Operation
Programming the Run-
Time Alerts
Programming the
Holiday Mode
Configuring the MISC
Outputs
Factory Defaults,
Calibration, and Sensors
Accessories
Advanced Setup Table
Light Activated
Operation
Page iv
Table of Contents

Page 1.1
Section 1 Contents:
Setting the Clock and Day...........1.2
Selecting the Heat or Cool
Mode............................................1.3
Selecting Your Desired
Temperature................................1.4
Using the Fan Button...................1.4
Note: Following the instructions in this section will allow you to
operate your thermostat using the factory default settings. These
settings are depicted in the illustrations throughout this manual.
SECTION 1
Quick Start
1

Buttons.
To adjust the
Clock or Day use
Press the MODE and
HUMIDITY buttons
at the same time
Press the MODE
and HUMIDITY
buttons at the
same time to
return to normal
operation.
Mo
Setup
2
Am
I2:00
Setup
I
Setting the Clock
During Setup &
Programming:
Pressing the UP or DOWN
buttons will modify the flashing
selection.
Setting the Day
Press
MODE
Page 1.2
1
HUMIDITY
MODE
SET CLOCK
HUMIDITY
MODE
SET CLOCK

Selecting the Heat or Cool Mode
Press
MODE
Press
MODE
Press
MODE
Press
MODE
HEAT
I2:00
Su
70
Pm
68
COOL
I2:00
Su
70
Pm
76
HEAT
COOL
AUTO
I2:00
Su
70
Pm
68
76
HEAT
COOL
I2:00
Su
Program On
70
Pm
68
76
OFF
I2:00
Su
70
Pm
occupied
Program On will activate the
stored timer operation for the
heating and cooling
setpoints (occupied or
unoccupied periods).
Time Schedule for
Heating or Cooling
Select Mode by Pressing the MODE Button
The HEAT setting indicates the
temperature the room has to
reach before the furnace will
turn on to heat the room.
Heating Only
The COOL setting indicates the
temperature the room has to
reach before the air conditioner
will turn on to cool the room.
Cooling Only
OFF indicates both heating
and air conditioning
systems are turned off.
Off
AUTO will automatically select
heat or cool based on room
temperature demand.
Heating or Cooling
Page 1.3
1

AUTO OR PROGRAM MODE
Pressing the UP or DOWN buttons in Auto or Program mode
will adjust both the heat and cool set temperatures
simultaneously.
buttons.
Adjust the desired
set temperature with the
HEAT
COOL
AUTO
I2:00
Su
70
Pm
68
76
HEAT OR COOL MODE
Pressing the UP or DOWN buttons in Heat or Cool mode will
adjust only the heat or cool set temperature.
buttons.
Adjust the desired
set temperature with the
COOL
I2:00
Su
70
Pm
76
Page 1.4
Selecting Your Desired Temperature
(adjusting the setpoints)
Press
FAN
HEAT
COOL
Su
70
Pm
68
76
I2:00
AUTO
FanOn
Using the Fan Button
1
Fan On indicates constant fan operation.
If Fan On is selected the fan will run
continuously at all times, except in Off,
and will only run if there is a heating or
cooling demand in Unoccupied periods.
Pressing the FAN button toggles this
feature on or off.

Section 2 Contents:
Front Panel Buttons.....................2.2
Display Features...........................2.3
Page 2.1
SECTION 2
Getting to Know Your Thermostat
2

Backlit LCD Display
Override
Button
Heat or Cool Demand Indicator
Red = Heat, Green = Cool
AUTO
I2:00
Su
Pm
HEAT
COOL
72
74
Front Panel
Page 2.2
2
Warmer Button
(glows red)
Cooler Button sometimes refer-
(glows blue) red to as the
DOWN button
[ ]
[ ]
sometimes referred
to as the UP button
HUMIDITY FANMODE
SET CLOCK
PROGRAM HOLIDAY
OUTDOOR
QUICK RELEASE FOR
ACCESSORY PORT
(pg. 23.1)
COMMERCIAL PROGRAMMABLE THERMOSTAT
HUMIDITY FAN PROGRAM HOLIDAY
MODE OVERRIDE
OUTDOOR
SET CLOCK
PLATINUM eries
AUTO
I2:00
Su
Pm
HEAT
COOL
72
74

AUTO
OFFON
Override
Unoccupied
Am
I8:88
SuMoTuWeThFrSa
Pm
AUXHEAT
COOL
FanOn
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
Remote
88
LO
HI
88
123
2
Display Features
Mode Indicators -
Selects the operational mode of the equipment.
HEAT - Indicates the heating mode.
COOL - Indicates the air conditioning mode.
AUTO - Indicates the system will automatically changeover
between heat and cool modes as the temperature varies.
OFF - Indicates heating and cooling is turned off.
PROGRAM ON - Indicates the time period program is enabled to
run.
Section 4
Clock with Day of the Week - Section 3
Indicates the current time and day. This clock is also used to program
the time period schedules.
Room Temperature Display - Section 5
Indicates the current room temperature and displays the outdoor
temperature when selected.
Desired Set Temperature - Section 4/5
Indicates desired room temperature(s). Also displays the highest
and lowest outdoor temperatures for the day.
Outside icon - Section 5
Indicates the temperature displayed is from the optional outdoor
sensor. Page 2.3
2

AUTO
OFFON
Override
Unoccupied
Am
I8:88
SuMoTuWeThFrSa
Pm
AUXHEAT
COOL
FanOn
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
Remote
88
LO
HI
88
123
2
Page 2.4
Display Features
Occupied & Unoccupied icons - Section 6
Indicates the program: Occupied or Unoccupied.
Override icon - Section 6
Indicates the program is currently being overridden.
Setup icon - Sections 7-20
Indicates the thermostat is in the setup mode.
Fan On icon - Section 7
Indicates constant, continuous fan operation. When Fan On is not
lit - indicates the fan will only operate when necessary to heat or to
cool.
Service Filter icon - Section 19
Appears when the filter should be serviced under normal conditions.
Adjustable from 0 - 1950 hours of blower operation.
icon - Section 8
Indicates keypad has been locked.
StartStop icon - Section 6
Appears when programming occupied time periods.
2

Remote icon - Page 22.4
Indicates the remote sensor reading of the thermostat is being
viewed.
AuxHeat icon - Pages 10.5 & 13.4
Indicates 2nd stage electric strip heat is being used when the therm-
ostat is programmed for Heat Pump operation. Only the Aux icon
will appear during Cool to Dehumidify to indicate Reheat operation.
Humidify/DeHumidify icon - Sections 9-10
Indicates the system is currently humidifying/dehumidifying the air.
Lo icon - Section 5
Indicates the lowest recorded outdoor temperature for the day.
Hi icon - Section 5
Indicates the highest recorded outdoor temperature for the day.
Service Pan icon - Section 16
Indicates that a sensor (accessory) has detected the condensate
drain pan is full and the compressor (Y1) has been locked out.
AUTO
OFFON
Override
Unoccupied
Am
I8:88
SuMoTuWeThFrSa
Pm
AUXHEAT
COOL
FanOn
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
Remote
88
LO
HI
88
123
Page 2.5
Display Features
UV Light icon - Section 11/19
Appears when the UV bulb should be serviced under normal
conditions. Adjustable from 0 - 1950 days of operation.
2

Page 3.1
Section 3 Contents:
Setting the Clock..........................3.2
Setting the Day.............................3.2
Note: During setup & programming pressing the UP or DOWN
buttons will modify the flashing selection.
SECTION 3
Setting the Clock and Day
3

Buttons.
To adjust the
Clock or Day use
Page 3.2
Mo
Setup
2
Am
I2:00
Setup
I
Setting the Clock
Setting the Day
Press
MODE
Press the MODE and
HUMIDITY buttons
at the same time
Press the MODE
and HUMIDITY
buttons at the
same time to
return to normal
operation.
During Setup & Programming:
Pressing the UP or DOWN
buttons will modify the flashing
selection.
3
HUMIDITY
MODE
SET CLOCK
HUMIDITY
MODE
SET CLOCK

Section 4 Contents:
Programming for Auto or
Program Operation....................4.2
Selecting the Proper
Operating Mode.........................4.3
Selecting Your Desired
Temperature...............................4.7
Page 4.1
Note: During setup & programming pressing the UP or DOWN
buttons will modify the flashing selection.
SECTION 4
Basic Operation
4

Page 4.2
Select Yes if you would like
the thermostat to be program-
mable or No for non-program-
mable.
YES
NO
i
Program On Setup
PROGRAM
Press
Programmable or Non-Programmable
Thermostat
PROGRAM
MODE
Note: Press the MODE
button momentarily
to move through the
setup screens. Press
and hold the MODE
button to move back-
wards through the
setup screens.
Press the PROGRAM button to leave the Setup screens. If no buttons are
pressed, the display will leave the setup screens after 30 seconds.
Press the MODE button. While holding
the MODE, press the PROGRAM
button to enter Setup screens.
If ‘NO’ is selected, the thermostat will lockout the Program On screen;
only the Off, Heat, Cool, and Auto screens may be accessed by
pressing the MODE button.
Select ‘YES’ if you would like your thermostat to be programmable,
then the Program mode will be accessible through the use of the
MODE button.
4When the very simplest operation is desired, this thermostat
may be configured to be non-programmable, with or without
Auto-Changeover. Follow the step below.

Page 4.3
YES
NO
2
AUTO
Setup
PROGRAM
Press
PROGRAM
MODE
MODE
Press the PROGRAM button to leave the Setup screens. If no buttons are
pressed, the display will leave the setup screens after 30 seconds.
Manual or Auto-Changeover
Thermostat
Press the MODE button. While holding
the MODE, press the PROGRAM
button to enter Setup screens.
Press the MODE button repeatedly
until this setup screen appears.
When the very simplest operation is desired, this thermostat may
be configured to be a manual heat and cool thermostat, with or
without time period programmability. Follow the step below.
The thermostat may be programmed to function as a Heat Only or
Cool Only thermostat by selecting ‘NO’ in the setup screen below.
This will lockout the Auto-Changeover screen and only allow the Off,
Heat, Cool, and Program On screens to be accessed.
Select Yes if you would
like the thermostat to
be Auto-Changeover or
No for a Heat Only and
Cool Only Thermostat.
4
Note: Press the MODE
button momentarily
to move through the
setup screens. Press
and hold the MODE
button to move back-
wards through the
setup screens.