Venstar T1 900 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
Digital
Thermostat
residential
T1
900
HEAT
COOL HEAT
PUMP
PROGRAMMABLE
7-DAY
PROGRAMMABLE
7-DAY
up to
& 2-cool
up to
& 2-cool
3-heat
3-heat
THERMOSTAT
with HUMIDITY
CONTROL
Control up to 3 Heat &
2 Cool Stages
3 Configurable Outputs
Timers & Deadbands
Backlit Display & Button
Legends
Aux Heat Indicator
Adjustable 2nd & 3rd Stage
Dry Contact Equipped
Outdoor Sensor Ready with
High/Low Readouts for the Day
Equipped with Optional Humidity
Module: Controls Humidification,
Dehumidification and Reheat
Programmable Output
Accepts EZ Programmer
Accepts Optional IR Remote Control
Accepts Comfort Call
Phone Control Accessory
OWNER’S
MANUAL
OWNER’S
MANUAL

Page i
NOTE: Due to variations in environmental conditions, it is not
always possible to achieve the desired humidification or
dehumidification setpoint.
MISC3 MISC3
OK
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 T1900
4Z95
CAUTION

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 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 #
The first page of each section contains a more detailed Contents of each
section, such as the example page shown below.

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
Table of Contents
Page iv
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 Outdoor and Remote
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
Dual Fuel Operation
Timers and Deadbands
Using the
Programmable Output
Programming Remote
Sensor Operation
Dry Contact Operation
Energy Save
Operation
Programming the Run-
Time Alerts
Programming the
Vacation Mode
Configuring the MISC
Outputs
Factory Defaults and
Calibration
Accessories
Advanced Setup Table

Section 1 Contents:
Front Panel Buttons.....................1.2
Display Features...........................1.3
Page 1.1
SECTION 1
Getting to Know Your Thermostat
1

Backlit LCD Display
Mode
Button
Heat or Cool Demand Indicator
Red = Heat, Green = Cool
Front Panel
Page 1.2
OUTDOOR
AUTO
I2:00
Mo
Pm
HEAT
COOL
72
74
HUMIDITY
FAN PROGRAM SET CLOCK
VACATION
1
Warmer Button sometimes referred
(glows red) to as the UP button
Cooler Button sometimes refer-
(glows blue) red to as the
DOWN button
[ ]
[ ]
QUICK RELEASE FOR
ACCESSORY PORT
(pg. 23.1)
COMMERCIAL PROGRAMMABLE THERMOSTAT
HUMIDITY PROGRAM SET CLOCK
FAN MODE
VACATION
PLATINUM eries
AUTO
I2:00
Su
Pm
HEAT
COOL
72
74
OUTDOOR

Page 1.3
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
Display Features
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 temperatures for the day.
Outside icon - Section 5
Indicates the temperature displayed is from the optional outdoor
sensor.
Evening
FanOn
AUXHEAT
COOL
AUTO
OFFON
Morning
DayNight
Am
I8:88
SuMoTuWeThFrSa
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
Vacation
Pm
88
LO
HI
88
1
1
1

Page 1.4
Setup icon -
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 the keypad has been locked.
StartStop icon - Section 6
Appears when programming timer functions.
UV Light icon - Section 19
Appears when the UV bulb should be serviced under normal
conditions. Adjustable from 0 - 1990 days of operation.
Sections 6-19
AUXHEAT
COOL
AUTO
OFFON
Morning
DayNight
Evening
FanOn
Am
I8:88
SuMoTuWeThFrSa
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
Vacation
Pm
88
LO
HI
88
Display Features
Morning, Day, Evening & Night icons - Section 6
Indicates the day part of the time period program.
1

Vacation icon -
Indicates the thermostat has Vacation setpoints in use.
AuxHeat icon - Page 14.4
Indicates 2nd stage electric strip heat is being used when the
thermostat 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 17
Indicates that a sensor (optional accessory) has detected the
condensate drain pan is full and the compressor (Y1) has been
locked out.
Section 20
COOL
AUTO
OFFON
Morning
DayNight
Evening
FanOn
Am
I8:88
SuMoTuWeThFrSa
Service Filter
Pan UV Light
Program On
StartStop
DeHumidify
I88
Setup
Outside
AUXHEAT
Vacation
Pm
88
LO
HI
88
Page 1.5
Display Features
1

Page 2.1
Section 2 Contents:
Setting the Clock and Day...........2.2
Selecting the Heat or Cool
Mode............................................2.3
Selecting Your Desired
Temperature................................2.4
Using the Fan Button...................2.4
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 2
Quick Start
2

Page 2.2
Buttons.
To adjust the
Clock or Day use
During Setup &
Programming:
Pressing the UP or DOWN
buttons will modify the flashing
selection.
Press the SET
CLOCK button
Press the SET
CLOCK button
to return to
normal operation.
Mo
Setup
2
Am
I2:00
Setup
I
Setting the Clock
Setting the Day
Press
MODE
2
To adjust the time by
hours press and hold
the FAN button while
pressing the UP or
DOWN buttons.
GRAM SET CLOCK MO
VACATION
GRAM SET CLOCK MO
VACATION

Page 2.3
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
OFF
I2:00
Su
70
Pm
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
Select Mode by Pressing the MODE Button
Time Schedule for
Heating or Cooling
The Program On setting will
activate the time period
programming for the cooling
or heating setpoint ONLY
(Morning, Day, Evening
& Night Periods).
COOL
I2:00
Su
Day
Program On
70
Pm
76
HEAT
68
2

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 2.4
Selecting Your Desired Temperature (adjusting the setpoints)
HEAT
COOL
AUTO
Su
70
Pm
68
76
I2:00
FanOn
Using the Fan Button
2
Press
FAN
Fan On indicates constant fan
operation. You may turn the fan
on even if the thermostat is in the
Off mode. Pressing the FAN button
toggles this feature on or off.

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
During Setup & Programming:
Pressing the UP or DOWN
buttons will modify the flashing
selection.
Page 3.2
Press the SET
CLOCK button
Press the SET
CLOCK button
to return to
normal operation.
Mo
Setup
2
Am
I2:00
Setup
I
Setting the Clock
Setting the Day
Press
MODE
3
To adjust the time by
hours press and hold
the FAN button while
pressing the UP or
DOWN buttons.
GRAM SET CLOCK MO
VACATION
GRAM SET CLOCK MO
VACATION

Section 4 Contents:
Programmable or Non-
Programmable Thermostat........4.2
Manual or Auto-Changeover
Thermostat..................................4.3
Selecting the Operating Mode....4.4
Selecting Your Desired
Temperature................................4.8
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.