Venstar T1075 User Manual
VENSTAR
FAN COIL
THERMOSTAT
FAN COIL
T1075
THERMOSTAT
7 DAY
PROGRAMMABLE
2 OR 4 PIPE
SYSTEMS
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
OWNER’S MANUAL
AND
INSTALLATION INSTRUCTIONS
Table Of Contents
FRONT PANEL
DISPLAY
QUICK START Set the clock and go
SELECTING THE HEAT
OR COOL MODE
BASIC OPERATION
OVERRIDING THE DAILY
SCHEDULE
PROGRAMMING Occupied / Unoccupied
ADVANCED SETUP
ADVANCED SETUP TABLE
ABOUT ADVANCED FEATURES
& OPERATION
SAMPLE WIRING DIAGRAMS
WARRANTY
CAUTION
before removing the old therm-
Disconnect Power
to the Heater/Air Conditioner
ostat and installing the new
thermostat.
2
3
6
7
11
12
13
18
24
25
34
38
WARNING
Model T1075
Copyright 2012 Venstar, Inc
All Rights Reserved
Page 1
Front Panel
I2:00
Mo
1
Am
74
COOL
AUTO
72
Mode Fan
HEAT
70
2
3
4
1
Liquid Crystal Display
2
Up/Down Buttons
Mode Button
3
4
Fan/Override Button
5
Heat or Cool Indicator
5
Heat = Red, Cool = Green
Page 2
Display
2
4
1
3
OUTSIDE
1
1
1
Mode Indicators - Pages 7-10
4
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
2
Indicates the current time and day. This clock is
also used to program the time period schedules.
3
Room Temperature Display
Indicates current room temperature.
4
Desired Set Temperature - Page 11
Indicates desired room temperature(s).
Page 3
Display
Am
Start
Pm
123
Stop
Setup
88
COOL
Locked
Override
AUTO
OUTSIDE
7
5
I2:00
SuMoTuWeThFrSa
6
unoccupied
88
HEAT
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
6
Indicates the program number: Occupied 1,2,3 or
Unoccupied.
Setup icon - Pages 18-23
7
Indicates the thermostat is in the advanced setup
mode.
8
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.
Page 4
88
Display
9
Am
Start
Pm
123
Stop
Setup
88
COOL
Locked
Override
AUTO
OUTSIDE
HEAT
I2:00
SuMoTuWeThFrSa
unoccupied
88
88
Start & Stop icons - Pages 14-16
9
Appear when programming occupied time periods.
Locked icon - Page 31
10
Indicates keypad has been locked.
Outside icon - Page 32
11
Indicates the temperature displayed is from the
optional outside sensor.
10
11
Page 5
Quick Start Set the Clock and Go
MODE FAN
Press the MODE and FAN buttons
at the same time for two seconds
to enter Setup screens.
Setting the Clock
Tip: To change
hours quickly,
press and hold
the FAN button
and press the
UP or DOWN
button.
Setting the Day
Press the MODE
and FAN buttons
at the same time
t o r e t u r n t o
normal operation.
Am
I2:00
MODE FAN
Setup
SetupMo
During Setup and
Programming:
Pressing the UP or
DOWN button will
modify the flashing
selection.
To adjust the
Clock or Day use
Press
MODE
buttons.
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
Page 6
Selecting the Heat or Cool Mode 4-Pipe Operation
Select Mode by Pressing the MODE Button
Pm
Heating Only
The HEAT setting indicates
the temperature the room
has to reach before the
heating source will turn
on to heat the room.
Cooling Only
The COOL setting indicates
the temperature the room
has to reach before the
cooling source will turn
on to cool the room.
Heating or Cooling
AUTO will automatically
select heat or cool based
on room temperature
demand.
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
OFF indicates both heating
and cooling are turned off.
I2:00
Mo
70
Pm
I2:00
Mo
70
Pm
I2:00
Mo
70
Pm
I2:00
Mo
occupied
1
70
ProgramOn
Pm
I2:00
Mo
HEAT
68
76
COOL
76
COOL
AUTO
HEAT
68
76
COOL
HEAT
68
OFF
Press
MODE
Press
MODE
Press
MODE
Press
MODE
70
Page 7
Selecting the Heat or Cool Mode 2-Pipe Operation
Heat Only
Step #6 = 1 in the Advanced Setup section,
page 19.
Heating Only
The HEAT setting indicates
the temperature the room
has to reach before the
heating source will turn
on to heat the room.
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
OFF indicates both heating
and cooling are turned off.
Page 8
Pm
I2:00
Mo
70
Pm
I2:00
Mo
occupied
1
70
ProgramOn
Pm
I2:00
Mo
70
HEAT
68
Press
MODE
HEAT
68
Press
MODE
OFF
Selecting the Heat or Cool Mode 2-Pipe Operation
Cool Only
Step #6 = 2 in the Advanced Setup section,
page 19.
Cooling Only
The COOL setting indicates
the temperature the room
has to reach before the
cooling source will turn
on to cool the room.
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
OFF indicates both heating
and cooling are turned off.
Page 9
Pm
I2:00
Mo
70
Pm
I2:00
Mo
occupied
1
70
ProgramOn
Pm
I2:00
Mo
70
76
COOL
76
COOL
OFF
Press
MODE
Press
MODE
Selecting the Heat or Cool Mode 2-Pipe Operation
Heating and/or Cooling
Step #6 = 3 in Advanced Setup (page 19), and the
accessory changeover sensor (ACC-SENFC) is used.
Step #6 = 4 or 5 in Advanced Setup (page 19).
Operation is the same as a 4-pipe system (page 7).
HEAT indicates the temperature
the room has to reach before the
heating source energizes. If the
water supply is cold, this screen
and heating would be locked out.
COOL indicates the temperature
the room has to reach before the
cooling source energizes. If the
water supply is hot, this screen
and cooling would be locked out.
If step #6 = 3, this
screen will not appear.
AUTO will automatically select
heat or cool based on the room
temperature demand.
If step #6 = 3, only
heat or cool will appear.
Program On will activate the
stored timer operation for the
heating and cooling setpoints.
OFF indicates both heating and
cooling are turned off.
Note: If the water temperature is
changed during the year, the therÂmostat will then automatically lock
out the incorrect mode.
Page 10
I2:00
Su
70
I2:00
Su
70
I2:00
Su
70
I2:00
Su
occupied
1
70
I2:00
Su
70
69
72
72
69
73
70
OFF
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Basic Operation
Selecting Your Desired Temperature
(adjusting the setpoints)
AUTO OR PROGRAM MODE
Pressing the UP or DOWN button when both Heat & Cool
setpoints are visable will adjust both the heat and cool
set temperatures simultaneously.
Pm
I2:00
Mo
70
Fan Operation
76
COOL
AUTO
HEAT
68
Press
FAN
Adjust the desired
set temperature with the
buttons.
Pressing the FAN button will run the fan in
low, medium, or high speed continuously
(see below and page 29).
When only the Fan icon is displayed, the fan
is in the Auto mode and will run only when
necessary to heat or cool (see below and
page 29).
Press
FAN
Low Speed Medium Speed
Fan Fan Fan
FAN
Press
Press
FAN
Press
FAN
High Speed Auto
Fan
Note: If the thermostat is placed in the Off mode, the fan
will de-energize.
Page 11
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