Venstar T1075 Operating instructions
VENSTAR
FAN COIL
THERMOSTAT
FAN COIL
THERMOSTAT
T1075
7 DAY
PROGRAMMABLE
2 OR 4 PIPE
SYSTEMS
OWNER’S MANUAL
AND
INSTALLATION INSTRUCTIONS
3 Occupied, 1 Unoccupied
Override capable
3 speed fan control
Auto 2-pipe changeover
when used with accessory
changeover sensor
Dry contact equipped
Backlit display
Works with most fan
coil systems - 24vac
Electric heat ready
Non-volatile memory
Dual or single setpoint
Keypad lockout
Remote sensor ready
Display F or C
Table Of Contents
FRONT PANEL
DISPLAY
QUICK START Set the clock and go
BASIC OPERATION
PROGRAMMING Occupied / Unoccupied
OVERRIDING THE DAILY
SCHEDULE
ADVANCED SETUP
ADVANCED SETUP TABLE
ABOUT ADVANCED FEATURES
& OPERATION
WARRANTY
SAMPLE WIRING DIAGRAMS
2
3
6
11
12
18
24
38
34
25
Page 1
13
SELECTING THE HEAT
OR COOL MODE
7
Model T1075
CAUTION
WARNING
Disconnect Power
to the Heater/Air Conditioner
before removing the old therm-
ostat and installing the new
thermostat.
Copyright 2012 Venstar, Inc
All Rights Reserved
72
74
70
Am
COOL
HEAT
AUTO
Mo
I2:00
Front Panel
Page 2
Liquid Crystal Display
Up/Down Buttons
Mode Button
Fan/Override Button
Heat or Cool Indicator
Heat = Red, Cool = Green
1
1
2
3
4
5
2
3
45
Mode Fan
Display
Page 3
OUTSIDE
1
2
3
4
4
1
1
1
2
3
4
Mode Indicators - Pages 7-10
Selects the operational mode of the equipment.
HEAT - Indicates the heating mode.
COOL - Indicates the cooling mode.
AUTO - Indicates the system will automatically
changeover between heat and cool modes
as the temperature varies.
PROGRAM ON - Indicates the time period
program is enabled to run.
OFF - Indicates heating and cooling are turned off.
Clock with Day of the Week - Page 6
Indicates the current time and day. This clock is
also used to program the time period schedules.
Room Temperature Display
Indicates current room temperature.
Desired Set Temperature - Page 11
Indicates desired room temperature(s).
Display
88
unoccupied
Am
Pm
SuMoTuWeThFrSa
123
I2:00
Page 4
Stop
Start
Setup
88
88
COOL
HEAT
Override
Locked
AUTO
OUTSIDE
67
8
5
Override icon - Pages 12 & 22
Indicates the program is currently being overridden
for up to six hours.
Occupied & Unoccupied icons - Pages 13-16
Indicates the program number: Occupied 1,2,3 or
Unoccupied.
Setup icon - Pages 18-23
Indicates the thermostat is in the advanced setup
mode.
Fan icon - Page 11
Indicates fan operation.
Fan = low speed
Fan = medium speed
Fan = high speed
When only the Fan icon is displayed, the fan is in
the Auto mode and will run only when necessary to
heat or cool.
5
6
7
8
Display
88
unoccupied
Am
Pm
SuMoTuWeThFrSa
123
I2:00
Page 5
Stop
Start
Setup
88
88
COOL
HEAT
Override
Locked
AUTO
OUTSIDE
Start & Stop icons - Pages 14-16
Appear when programming occupied time periods.
Locked icon - Page 31
Indicates keypad has been locked.
Outside icon - Page 32
Indicates the temperature displayed is from the
optional outside sensor.
9
10
11
9
10
11
The thermostat is preprogrammed from the factory to
operate a 4 pipe system without the need for further
programming. To optimize the installation of this
thermostat for a 2 pipe system, follow the instructions
in the Advanced Setup section. Page 19
Press the MODE and FAN buttons
at the same time for two seconds
to enter Setup screens.
Quick Start Set the Clock and Go
Press
MODE
Setting the Clock
Setting the Day
Am
Setup
I2:00
SetupMo
MODE FAN
MODE FAN
Press the MODE
and FAN buttons
at the same time
t o r e t u r n t o
normal operation.
Page 6
To adjust the
Clock or Day use
buttons.
During Setup and
Programming:
Pressing the UP or
DOWN button will
modify the flashing
selection.
Tip: To change
hours quickly,
press and hold
the FAN button
and press the
UP or DOWN
button.
70 68
Pm
HEAT
Mo
I2:00
70
76
Pm
COOL
Mo
I2:00
70
76
68
Pm
COOL
HEAT
AUTO
Mo
I2:00
70
76
68
occupied
ProgramOn
Pm
COOL
HEAT
Mo
1
I2:00
70
Pm
OFF
Mo
I2:00
Press
MODE
Press
Press
Press
MODE
MODE
MODE
Page 7
The HEAT setting indicates
the temperature the room
has to reach before the
heating source will turn
on to heat the room.
Heating Only
The COOL setting indicates
the temperature the room
has to reach before the
cooling source will turn
on to cool the room.
Cooling Only
OFF indicates both heating
and cooling are turned off.
Off
AUTO will automatically
select heat or cool based
on room temperature
demand.
Heating or Cooling
Time Schedule for
Heating or Cooling
Program On will activate
the stored timer operation
for the heating and cooling
setpoints (occupied or
unoccupied periods).
Select Mode by Pressing the MODE Button
Selecting the Heat or Cool Mode 4-Pipe Operation
Heat Only
Step #6 = 1 in the Advanced Setup section,
page 19.
70 68
Pm
HEAT
Mo
I2:00
70 68
occupied
ProgramOn
Pm
HEAT
Mo
1
I2:00
70
Pm
OFF
Mo
I2:00
Press
Press
MODE
MODE
Selecting the Heat or Cool Mode 2-Pipe Operation
The HEAT setting indicates
the temperature the room
has to reach before the
heating source will turn
on to heat the room.
Heating Only
Time Schedule for
Heating or Cooling
Program On will activate
the stored timer operation
for the heating and cooling
setpoints (occupied or
unoccupied periods).
OFF indicates both heating
and cooling are turned off.
Off
Page 8
Cool Only
Step #6 = 2 in the Advanced Setup section,
page 19.
70
76
occupied
ProgramOn
Pm
COOL
Mo
1
I2:00
70
Pm
OFF
Mo
I2:00
Press
Press
MODE
MODE
70
76
Pm
COOL
Mo
I2:00
Selecting the Heat or Cool Mode 2-Pipe Operation
The COOL setting indicates
the temperature the room
has to reach before the
cooling source will turn
on to cool the room.
Cooling Only
OFF indicates both heating
and cooling are turned off.
Off
Time Schedule for
Heating or Cooling
Program On will activate
the stored timer operation
for the heating and cooling
setpoints (occupied or
unoccupied periods).
Page 9
Table of contents
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