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

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.
70
I2:00
Su
OFF
Press
MODE
Press
Press
Press
MODE
MODE
MODE
Page 10
70
I2:00
69
Su
70
72
I2:00
Su
70
73
I2:00
70
Su occupied 1
Note: If the water temperature is
changed during the year, the ther-
mostat will then automatically lock
out the incorrect mode.
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).
Selecting the Heat or Cool Mode 2-Pipe Operation
Program On will activate the
stored timer operation for the
heating and cooling setpoints.
If step #6 = 3, only
heat or cool will appear.
70
72
I2:00
69
Su
If step #6 = 3, this
screen will not appear.
AUTO will automatically select
heat or cool based on the room
temperature demand.
OFF indicates both heating and
cooling are turned off.

Selecting Your Desired Temperature
(adjusting the setpoints)
Basic Operation
70
76
68
Pm
COOL
HEAT
AUTO
Mo
I2:00
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.
buttons.
Adjust the desired
set temperature with the
Fan Operation
Press
FAN
Press
FAN
Press
FAN
Press
FAN
Press
FAN
Low Speed Medium Speed High Speed Auto
Fan
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).
Note: If the thermostat is placed in the Off mode, the fan
will de-energize.
Fan Fan Fan
Page 11

Overriding the Daily Schedule
Basic Operation
Pressing and holding the FAN button for 5 seconds
may be used to interrupt the normal time schedule
programming of the thermostat. The override feature
may only be used when the thermostat is running the
time schedule, in Program On mode.
Press
FAN FOR
5 SECONDS
7:56
7:56
O
O
85
55
O
O
74
68
Override
Unoccupied Operation - During programmed,
unoccupied periods pressing and holding the FAN
button for 5 seconds will temporarily force the
thermostat into Occupied 1 comfort settings for one
to six hours (step #14, page 22). The Override icon
will be illuminated during this time. If you press and
hold the FAN button while the thermostat is
currently overriding the daily schedule, this will
reset the timer, returning the thermostat to the
correct time period program for the day.
Occupied Operation - Pressing and holding the
FAN button for 5 seconds during a programmed
Occupied time period will have no effect.
Page 12

Programming Occupied & Unoccupied Periods
Press
Press
Press
Press
Continued
MODE
MODE
MODE
MODE
occupied 1
74
COOL
1
74
72
COOL
HEAT
1
85
unoccupied COOL
Press the MODE button. While holding
MODE, press the UP button for two
sec o nds to ent e r tim e perio d
programming.
MODE
Select the maximum # of
occupied periods to be
used on any one day.
Typically, most installations
use only Occupied 1.
(1,2 or 3)
Adj u st t h e coo l ing
setpoint for Occupied 1.
(35 - 99 )
Ad just the heati ng
setpoint for Occupied 1.
(35 - 99 )
occupied
occupied
Adjust the cooling
setpoint for unoccupied
periods.
(35 - 99, OF )
Page 13

MODE
Programming Occupied & Unoccupied Periods
Press
Press
Press
Press
Press
MODE
MODE
MODE
MODE
55
unoccupied
HEAT
Am Start
1
7:00
85
COOL
Mo
Mo
Pm Stop
1
6:00
Mo
ON
1
Off
On
Mo
Select day of the
week to program.
(Mo - Su)
Adjust the start time
for Occupied 1.
Adjust the stop time
for Occupied 1.
Select Occupied 1
to run on this day
(On), or not to run
on this day (Off).
occupied
occupied
occupied
occupied
Page 14
Adjust the heating set-
point for Unoccupied
periods.
(OF, 35 - 99 )
Continued

Programming Occupied & Unoccupied Periods
Press
Press
Press
Continued
Select Yes or No to copy
th e p r ev i o u s da y ’s
program to this day.
If No is
selected:
Selecting Yes, then pressing mode
will copy the previous day’s program
and then will ask the same copy
question again. If yes is selected
each time, this routine will repeat
until Saturday is copied to Sunday.
After Saturday is copied to Sunday,
the copy command is unavailable.
The copy command becomes available after the
maximum # of occupied periods are programmed
in a day. This example uses 1 as the maximum
occupied periods ever programmed in one day.
Yes
No
MODE
MODE
MODE
Co Py
Tu
occupied
Tu
1
occupied
Am Start
Tu
1
9:00
(Tu - Mo)
Select day of the
week for Occupied 1.
Adjust the start time
fo r o ccupied 1.
Page 15
Press
If Yes is selected:
MODE

Programming Occupied & Unoccupied Periods
Press
Select Occupied 1 to
run on this day (On),
or not to run this day
(Off).
Off
On
Selecting Yes, then pressing mode
will copy the previous day’s program
and then will ask the same copy
question again. If yes is selected
each time, this routine will repeat
until Saturday is copied to Sunday.
After Saturday is copied to Sunday,
the copy command is unavailable.
If no is selected, as in previous steps flashing prompts for
input will appear for start and stop times for Occupied 1.
If more than one occupied period was selected on page
13, then cool/heat setpoints, and start/stop times for
additional occupied periods will be prompted.
Select Yes or No to
copy the previous
day’s program to this
day.
Yes
No
Press
MODE
MODE
Press
MODE
Page 16
occupied
Tu
1
Co Py
We
ON
occupied
Pm Stop
Tu
1
5:00
Adjust the stop time
for occupied 1.
If No is
selected:
If Yes is selected:

PROGRAMMING NOTES
You will be prompted to enter both heat and cool
setpoints even if the thermostat is configured for
heat only, or cool only.
Heat & Cool setpoints for Occupied 1 are the same for
each day. Heat & Cool setpoints for Occupied 2 & 3 can
be adjusted differently for each day, if desired.
If the start time is set for later than the stop time, the
program will run from the start time to midnight and from
midnight to the stop time on the same day. For example:
9:00pm start, 8:00am stop, on Monday. This program
will run from 12:00am Monday to 8:00am and
again from 9:00pm to 11:59pm on Monday.
The Unoccupied settings take effect at all times when:
(1) the program is on and (2) the current time is outside
an occupied period. For this reason start and stop
times are not necessary for unoccupied.
If the same start and stop times are programmed in for
an occupied period, then it will run 24 hours.
If one occupied period starts and stops within another
occupied period, the lower occupied # has priority.
example: If Occupied 3 is programmed to be “on” 24
hours, and Occupied 2 is programmed to run that day,
then Occupied 2 settings will take precedence during
that time.
For
If only 1 Occupied period is selected, the Occupied 2 & 3
steps will be skipped. Further, if only 2 occupieds are
selected, the Occupied 3 steps will be skipped.
Programming Occupied & Unoccupied Periods
During the Override mode (see page 12), the Occupied 1
Heat & Cool setpoints are used.
Page 17

Press
Press
Select Display operation:
On = Full Display
Off = Minimal display
Select the day of the
week.
Display On
Display Off See Page 29
MODE
MODE
Adjust the time of day.
Tip: To change hours
quickly, press and hold
the FAN button and
press the UP or DOWN
buttons.
NOTE: Each step
# is located at the
top right corner of
the display for easy
reference.
Press the MODE and
FAN buttons at the
same time for 10
seconds to enter
A d v a n c e d S e t u p
screens.
Advanced Setup
MODE FAN
2
Setup
I
Am
Setup
I2:00
3
ON
Setup
Press
MODE
Continued
Page 18
Note: #3 & #4 require accessory ACC-SENFC
changeover sensor
Mo

Advanced Setup
Select fan coil system
type:
2 = 2-pipe fan coil
4 = 4-pipe fan coil
4
2
4
5
Setup
Press
MODE
Page 19
Select Display operation:
1 = Single Setpoint
2 = Dual Setpoint
See Page 33
setpoint will always be displayed. To display the
room temperature, press and hold the MODE
button for two seconds. The degree icon will
blink when the large number is displaying room
temperature and will remain solid when dis-
playing the heating or cooling setpoint.
4
Setup
2
Note: When Single Setpoint is
selected, the heating or cooling
Press
MODE
Continued
Step #6 only appears if step #5 = 2.
2 PIPE SYSTEM OPERATION
1= Heat only system
2= Cool only system
3= Heat/Cool Auto
changeover
4= Heat/Cool Aux Electric
heat, Lockout Electric Heat
when Hot Water is available
5= Heat/Cool total electric
heat, no Hot Water, only
Electric Heat.
Press
MODE
I
6
Setup