Venstar T1900 Installation
Digital
Digital
Thermostat
Thermostat
residential
THERMOSTAT
900
T1
7-DAY
7-DAY
PROGRAMMABLE
PROGRAMMABLE
up to
up to
& 2-cool
3-heat
3-heat
& 2-cool
HEAT
COOL
with HUMIDITY
CONTROL
Dry Contact Equipped
Outdoor Sensor Ready with
Control up to 3 Heat &
2 Cool Stages
3 Configurable Outputs
Adjustable 2nd & 3rd Stage
Timers & Deadbands
Backlit Display & Button
Legends
Aux Heat Indicator
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 3 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
INSTALLATION
INSTALLATION
INSTRUCTIONS
INSTRUCTIONS
Venstar Inc. 08/07
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
HEAT
PUMP
CAUTION
Follow the Installation Instructions before proceeding.
Set the thermostat mode to “OFF” prior to changing
settings in setup or restoring Factory Defaults.
CAUTION
NEVER PUT MORE THAN ONE
JUMPER ON THE SAME MISC
JUMPER BLOCK!
THIS MAY DAMAGE YOUR
THERMOSTAT AND VOID
YOUR WARRANTY.
MISC3
OK
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.
Thermostat T1900
Tested to Comply
c
with FCC Standards
C
F
4Z95
FOR HOME OR OFFICE USE
MISC3
Page i
Table of Contents
Preparation
Remove & Replace the
Old Thermostat
Configuring the MISC
Outputs
Wire Connections
Wiring Diagrams
Test Operation
Calibrating the
Thermostat Sensors
TroubleShooting
1
2
3
4
5
6
7
8
Page iii
SECTION 1
Preparation
1
Proper installation of the thermostat will be
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accomplished by following these step by step
instructions. If you are unsure about any of these
steps, call a qualified technician for assistance.
Assemble tools
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Flat Blade
Screwdriver
Make sure your Heater/Air Conditioner is working
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properly before beginning installation of the
Wire cutter
& Stripper
thermostat.
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Carefully unpack the thermostat. Save the screws,
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bracket, and instructions.
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Turn off the power to the Heating/Air Conditioning
HEAT
72
system at the main fuse panel. Most residential
systems have a separate breaker for disconnecting
power to the furnace.
Page 1.1
SECTION 2
Remove & Replace the Old Thermostat
Remove the cover of the old thermostat.
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If it does not come off easily check for screws.
Loosen the screws holding the thermostat
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base or subbase to the wall, and lift away.
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Disconnect the wires from the old thermostat.
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Tape the ends of the wires as you disconnect
them, and mark them with the letter of the
terminal for easy reconnection to the new
thermostat.
Keep the old thermostat for reference purposes,
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until your new thermostat is functioning properly.
2
Page 2.1
SECTION 3
Configuring the MISC Outputs
3
Section 3 Contents:
Configuring the Jumpers........3.2
Explanation of Jumper
Settings..................................3.3
Page 3.1
Configuring the Jumpers
For additional flexibility, your thermostat has three configurable
outputs. These outputs are designed to have different functions
3
depending on how the jumpers are set (below).
Each output, labeled MISC1, MISC2, and MISC3 may be set for one
of the five choices available.
In the diagram below, the MISC3 jumper has been set for HUM
(humidification) operation, the MISC2 jumper has been set for DEHUM
(dehumidification) operation, and the MISC1 jumper has been set for
PROG (programmable) operation.
(FAN)
PROG
DEHUM
MISC2
CKGND
W3
HUM
W1
Y1
G
CK1
R
C
MISC3 MISC2 MISC1
ELEC
GAS
HP
2
4
INSTALL HUMIDITY
1
3
GAS
B
O
W2
MISC1
HUM
NO HUM
RS2
MISC3
RS+5
Z
8
6
X
Rs1
1
RSGND
Y
579
Y2
(MISC1
ONLY)
MODULE WITH SENSING
ELEMENT OUTWARD
W3
PROG
HUM
DEHUM
MISC3 MISC2 MISC1
Y2
(MISC1
ONLY)
CAUTION
NEVER PUT MORE THAN
ONE JUMPER ON THE SAME
MISC JUMPER BLOCK!
DOING SO MAY DAMAGE
YOUR THERMOSTAT AND
VOID THE WARRANTY.
Page 3.2
MISC3
OK
MISC3
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