VENSTAR
FAN COIL
THERMOSTAT
FAN COIL
T1070
THERMOSTAT
NON-
PROGRAMMABLE
2 OR 4 PIPE
SYSTEMS
Works with most fan
Remote sensor ready
3 speed fan control
Self-prompting adjustment
Auto 2-pipe changeover
when used with ACC-SENFC
changeover sensor
Dry contact equipped
Backlit display
coil systems - 24vac
Electric heat ready
Non-volatile memory
Dual setpoint with
adjustable deadband
Keypad lockout
Configurable display
Display F or C
OWNER’S MANUAL
AND
INSTALLATION INSTRUCTIONS
Table Of Contents
FRONT PANEL
DISPLAY
SELECTING THE HEAT
OR COOL MODE
BASIC OPERATION
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.
Model T1070
2
3
5
9
10
15
16
25
29
WARNING
Copyright 2012 Venstar, Inc
All Rights Reserved
Page 1
Front Panel
1
74
COOL
AUTO
72
Mode Fan
3
4
1
Liquid Crystal Display
2
Up/Down Buttons
Mode Button
3
4
Fan Button
5
Heat or Cool Indicator
Heat = Red, Cool = Green
Page 2
HEAT
70
2
5
Display
4
3
unoccupied
2
OUTSIDE
1
1
1
3
Mode Indicators - Page 5-8
1
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.
OFF - Indicates heating and cooling are turned off.
2
Room Temperature Display
Indicates current room temperature.
3
Desired Set Temperature - Page 9
Indicates desired room temperature(s).
Setup icon - Pages 10-14
4
Indicates the thermostat is in the advanced setup
mode.
Page 3
Display
8
unoccupied
OUTSIDE
5
5
Fan icon - Page 9
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.
Locked icon - Page 21
6
Indicates keypad has been locked.
7
Outside icon - Page 22
Indicates the temperature displayed is from the
optional outside sensor.
8
Unoccupied icons - Pages 13-14
Indicates a dry contact forced Unoccupied time
period is in effect.
6
7
Page 4
Selecting the Heat or Cool Mode 4-Pipe Operation
Select Mode by Pressing the MODE Button
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.
70
70
70
HEAT
68
76
COOL
76
COOL
AUTO
HEAT
68
Press
MODE
Press
MODE
Press
MODE
Off
OFF indicates both heating
and cooling are turned off.
Page 5
OFF
70
Selecting the Heat or Cool Mode 2-Pipe Operation
Heat Only
Step #4 = 1 in the Advanced Setup section,
page 11.
Heating Only
The HEAT setting indicates
the temperature the room
has to reach before the
heating source will turn
on to heat the room.
Off
OFF indicates both heating
and cooling are turned off.
70
HEAT
68
Press
MODE
OFF
70
Page 6
Selecting the Heat or Cool Mode 2-Pipe Operation
Cool Only
Step #4 = 2 in the Advanced Setup section,
page 11.
Cooling Only
The COOL setting indicates
the temperature the room
has to reach before the
cooling source will turn
on to cool the room.
Off
OFF indicates both heating
and cooling are turned off.
Page 7
70
70
76
COOL
OFF
Press
MODE
Selecting the Heat or Cool Mode 2-Pipe Operation
Heating and/or Cooling
Step #4 = 3 in Advanced Setup (page 11), and the
accessory changeover sensor (ACC-SENFC) is used.
If step #4 = 4 or 5 in Advanced Setup (page 11).
Operation is the same as a 4-pipe system (page 5).
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 #4 = 3, this
screen will not appear.
AUTO will automatically select
heat or cool based on the room
temperature demand.
70
70
70
69
72
72
69
Press
MODE
Press
MODE
Press
MODE
OFF indicates both heating
and cooling are turned off.
OFF
70
Note: If the water temperature is changed during the
year, the thermostat will then automatically lock out the
incorrect mode.
Page 8
Basic Operation
Selecting Your Desired Temperature
(adjusting the setpoints)
AUTO OR PROGRAM MODE
Pressing the UP or DOWN button in Auto or Program
mode will adjust both the heat and cool set temperatures
simultaneously.
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 20).
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 20).
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 9
Advanced Setup
MODE FAN
Display On
Select Display operation:
On = Full Display
Off = Minimal display
Display Off
Select Display operation:
1 = Single Setpoint
2 = Dual Setpoint
Note: When Single Setpoint
is selected, the heating or
cooling 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 displaying the heating or
cooling setpoint.
Press the MODE and
FAN buttons at the
same time for 10
seconds to enter
A d v an ce d S e tu p
screens.
See Page 20
See Page 24
2
NOTE: Each step
# is located at the
top right corner of
the display for easy
reference.
Setup
I
ON
Setup
2
Continued
Press
MODE
Press
MODE
Page 10
Advanced Setup
4
Select fan coil system
type:
2 = 2-pipe fan coil
4 = 4-pipe fan coil
2
Step #4 only appears if step #3 = 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.
Note: Steps #3 & #4 require accessory
changeover sensor ACC-SENFC
Select operation when
fan is in the Auto mode:
On
On = continuous low
speed fan
Off = only energize
during a heating or
Off
cooling cycle.
See Page 20, Note #2 for additional
information for this step.
Page 11
4
I
Continued
Setup
Setup
3
Press
MODE
4
Press
MODE
5
AUTO
Press
MODE
Advanced Setup
Select Fan Coil Type
On
On = Carrier or IEC
fan coil using a
33ZCRLYBRD relay
board.
Off
Off = Conventional
3 speed fan coil system.
See Page 24 for further explanation of Fan Coil Type.
Adjust the deadband
for the 1st stage.
(1 - 6 )
See Page 17
Step #7 will not appear if step #4 = 1 or 2.
2
Setup
6
Press
MODE
7
Press
MODE
Adjust the minimum
difference between
cooling & heating
setpoints.
(0 - 6 )
On
Select backlight operation:
On - Light continuously
Off - Light for 8 seconds
after a button press
Off
Page 12
Setup
2
Setup
Continued
8
COOL
HEAT
9
Press
MODE
Press
MODE
Advanced Setup
C
Se lec t th erm o sta t
operation in degrees
Fahrenheit or Celsius.
F
Yes
Select sensor operation:
Yes =
read only duct
sensor
No = control to duct
No
sensor
NO
Dry Contact
NO = Normally Open
NC = Normally Closed
NC
See Page 18
Setup
I0
Setup
I I
OUTSIDE
Setup
I2
Continued
Press
MODE
Press
MODE
Page 13
Advanced Setup
Unoccupied Setpoints
Select Dry Contact
Unoccupied operation:
Unoccupied = when the
Dry Contact is closed,
Off
the thermostat will control to the Unoccupied setpoints.
Off = when the Dry Contact is closed,
the thermostat will be forced into the
Off mode.
Adjust the cooling
setpoint for unoccupied periods.
(35 - 99, OF )
Adjust the heating setpoint for Unoccupied
periods.
(OF, 35 - 99 )
After programming is complete, press the
MODE and FAN buttons at the same time
to leave the Setup screens. If no buttons
are pressed, the display will leave the
setup screens after sixty seconds.
Setup
unoccupied
85
unoccupied
unoccupied
I3
55
Press
MODE
Press
MODE
Page 14
Advanced Setup
Advanced Setups - Table
Step
1 Display Declutter
2 Single or Dual Setpoint
3 2 or 4 Pipe System
4 2 Pipe System Operation
5 Fan Auto Operation
6 Fan Coil Type Operation
7 1st Stage Deadband
8 Heat Cool Differential
9 Backlight
10 Degrees F or C
11 Sensor Operation
12 Dry Contact Polarity
13 Dry Contact Operation
14 Unocc. Cool Setpoint
15 Unocc. Heat Setpoint
Description
Page 15
Range
On / Off
Single / Dual
2 / 4
5 Choices
On / Off
On / Off
1 - 6
0 - 6
On / Off
F / C
Yes / No
NO / NC
Unocc. / Off
35 - 99 , OF
OF, 35 - 99
Default
On
2
4
1
Off
Off
2
2
Off
F
No
NO
Unocc.
85
55
About Advanced Features & Operation
CALIBRATION - Under normal circumstances it will not
be necessary to adjust the calibration of the temperature
sensor.
1
MODE
Place the thermostat in the OFF
mode.
72
OFF
2
MODE
3
4
MODE
Press button.
While holding the MODE button,
press and hold the DOWN button
for 5 seconds. All icons will
appear on the display.
Press the MODE button once. The
thermostat temperature will be
displayed and may be calibrated
using the UP or DOWN button.
After calibration is complete, press
the MODE button once to save
your changes and return to normal
operation.
and hold the MODE
Software Version #
Page 16
Setup
unoccupied
88
500
72
72
88
COOL
Locked
Override
AUTO
OUTSIDE
HEAT
88
HEAT
60
OFF
About Advanced Features & Operation
DEADBAND OPERATION - Controls one Heat and
one Cool stage with a three speed fan (see below).
The low speed fan for heat or cool is turned on when:
The temperature spread from the setpoint is equal to
or greater than: the setpoint plus the 1st stage dead-
band (step #7, page 12). This 1st stage deadband is
adjustable from 1-6 degrees and the default is two
degrees.
The medium speed fan for heat or cool is turned on
when: The temperature spread from the setpoint is
equal to or greater than: the setpoint plus the 1st stage
deadband (step #7, page 12), plus the 2nd stage deadband. This 2nd stage deadband is fixed at one degree
and is not adjustable.
The high speed fan for heat or cool is turned on when:
The temperature spread from the setpoint is equal to or
greater than: the setpoint plus the 1st stage deadband
(step #7, page 12), plus the 2nd stage deadband, plus
the 3rd stage deadband. This 3rd stage deadband is
fixed at one degree and is not adjustable.
Heating
1-6
DB 31DB 21DB 1
Med-
Hi-
speed
speed
fan
DECREASE INCREASE
speed
fan
Heat
Lo-
fan
SP
TEMPERATURE
Cool
SP
1-6
DB 1
Cooling
DB 21DB 3
Lo-
speed
fan
1
Med-
speed
fan
Hi-
speed
fan
The above figure assumes the minimum on time for the
prior stage has been met to allow the next stage to turn
on once the deadbands have been exceeded.
Page 17
About Advanced Features & Operation
DRY CONTACT SWITCH -
This feature allows an external device such as a Central Time Clock, Occupancy Sensor, or a Telephone activated device to force
one or more thermostats into an Unoccupied mode
(steps #12 and 13, page 13 & 14).
When the CK1 and R terminals are shorted together,
and the thermostat is programmed for Unoccupied
operation (step #13, page 14), the thermostat will be
forced into Unoccupied setpoints and the Unoccupied
icon will appear on the display.
Important Note: For control of multiple
thermostats by 1 source, refer to page 28
‘Potential Phasing Problems’ before
installation.
TERMINAL CONNECTIONS
5
S+
G
R
RS
RY1G3
ENCLOSED
4Z95
ENERGY
24V. 60HZ
MANAGEMENT
NEC CLASS 2
EQUPIMENT
C
W1
G2
MODEL: T1070
X072500204
MADE IN CHINA
H2O
CK1
Connect wires to a time clock or other device to
force the thermostat into Occupied 1 or
Unoccupied settings.
Page 18
About Advanced Features & Operation
FACTORY DEFAULTS return all the stored settings back to the factory default
settings, follow the instructions below.
WARNING: This will reset all Advanced Programming to the default settings. Any information
entered prior to this reset will be permanently
lost.
1
MODE
Place the thermostat in the OFF
mode.
If, for any reason, you desire to
72
2
MODE
3
FAN
4
MODE
Press button.
While holding the MODE button,
press and hold the DOWN button
for 5 seconds. All icons will
appear on the display.
After all of the icons appear,
release the MODE and DOWN
buttons. Then press and hold the
FAN button for 2 seconds.
After the letters Fd appear on the
display (Factory Default), release
the FAN button. Press the MODE
button twice to return to normal
operation.
and hold the MODE
unoccupied
72
Setup
OFF
88
COOL
Locked
Override
AUTO
OUTSIDE
HEAT
88
OFF
Page 19
About Advanced Features & Operation
FAN OPERATION
Fan: When only the fan icon is displayed, this
indicates that the fan is in the Auto mode, will only
energize during a heating or cooling cycle, and will
modulate fan speeds based on temperature demand
(see page 17).
Fan , Fan , or Fan : Pressing the FAN button
will cause the low, medium, or high speed fan icon to
appear (see page 9), indicating that the fan will run
continuously. The fan will de-energize if the thermostat is placed in the Off mode or a dry contact forced
unoccupied time period (see page 18).
Notes:
1) If a Duct sensor is connected to this thermostat,
then the fan should be programmed for continuous
operation (step #5, page 11). This will provide airflow
over the Duct sensor and provide more accurate
temperature readings.
2) If the fan is programmed for continuous operation
(step #5, page 11), the low speed fan will run continuously when the fan is in the Auto mode, but will
de -en er giz e i f th e t her mo s ta t i s pl ac e d
in the Off mode.
MINIMAL DISPLAY - When the thermostat is programmed for a minimal display (step #1, page 10), the
entire display will be blank. When a button is pressed
the full, normal display will appear for 10 seconds.
Page 20
About Advanced Features & Operation
HEAT/COOL DIFFERENTIAL - The Heat and Cool setpoints will not be allowed to come any closer to each
other than the value set in Advanced Setup step #8, on
page 12. This minimum difference is enforced during
Auto-changeover operation.
Note: To increase the spread between the heating and
cooling setpoints in the Auto-changeover mode press
the MODE button until only the heat setpoint is displayed; adjust to the desired setpoint. Press the MODE
button until only the cool setpoint is displayed; adjust to
the desired setpoint. Press the MODE button again to
enter the Auto-changeover mode where both the heat
and cool setpoints are displayed.
KEYPAD LOCKOUT - To prevent unauthorized use of
the thermostat, the front panel buttons may be disabled.
To disable, or ‘lock’ the keypad, press and hold the
MODE button. While holding the MODE button, press
the UP and DOWN buttons together. The LOCKED icon
will appear on the display, then release the buttons.
Press all three
buttons in the order
outlined above for
keypad lockout
To unlock the keypad, press and hold the MODE button.
While holding the MODE button, press the UP and
DOWN buttons together. The LOCKED icon will disappear from the display, then release the buttons.
MODE
70
76
COOL
Locked
AUTO
HEAT
68
Page 21
About Advanced Features & Operation
LOCKING COVER
w/Tamper Proof Screws
74
COOL
AUTO
72
Mode Fan
OUTSIDE SENSOR - To view an Outside Sensor
press and hold the FAN button for two seconds
until the Outside icon appears. If an optional
outside sensor is connected, the outside
temperature will appear on the display. To exit
the outside temperature display, press any button.
HEAT
70
72
Page 22
74
COOL
AUTO
HEAT
70
About Advanced Features & Operation
DUCT SENSOR (P/N ACC0402) - The
thermostat is programmed from the factory to
automatically recognize when a Duct Sensor is
connected (step #11, page 13).
Digital Sensor
High Temp. Heat
Shrink Tubing
5’ Plenum Rated
Cable
White
Black
Duct Sensor connections are illustrated on page 27.
Note: If a Duct sensor is connected to this thermostat, then the fan should be programmed for
continuous operation (step #5, page 11). This will
provide airflow over the Duct sensor and provide
more accurate temperature readings.
Page 23
About Advanced Features & Operation
SINGLE SETPOINT BEHAVIOR - When configured
for Single Setpoint operation (step #2, page 10), the
degree icon will blink when the large number is displaying room temperature and will remain solid when displaying the heating or cooling setpoint. In the Auto
mode the deadband is enforced both above and below
the setpoint. To avoid short cycling, a deadband of at
least two degrees is recommended (step #7, page 12).
To display the room temperature press and hold the
MODE button for two seconds. Release the MODE
button to return to the normal display.
FAN COIL TYPE - This step instructs the thermostat
how to set the G, G2, and G3 outputs to yield the
desired fan speeds. Since this is a low voltage
thermostat, the fan coil should have multiple relays or
contactors to supply the voltages needed for the fan
motor. Most fan coils will have 3 relays and require
only one relay to be driven at a time. However,
many models of Carrier or IEC fan coils contain a
relay board with special logic that requires different
output settings from the thermostat. If there is any
question, please contact the fan coil manufacturer.
Step 6 = OFF Step 6 = ON
Speed
LO
MED
HI
G
ON
G2
ON
G3
ON
Page 24
Speed
LO
MED
HI
G
ON
ON
ON
G2
ON
G3
ON
Sample Wiring Diagram
2-Pipe, Low Voltage Valve, H2O Changeover Sensor
Thermostat
R
G
Y1
G3
W1
G2
C
H2O
C
R
H O Changeover Sensor
2
ACC-SENFC
Page 25
If 2-pipe with auxiliary
electric heat
R
VEH
C
24vac
24 Volt Water
Valve
Generic Relay Board
G
G
L
G2/(W)
G2
M
G3/(Y)
G3
H
COM
COM
LO
LO (L1)
L1 (N/A)
HI (HI)
MED (MED)
Sample Wiring Diagram
4-Pipe, Low Voltage Valves, Duct Temperature
Sensor & Dry Contact
Duct Sensor
ACC0402
Thermostat
Dry Contact
G3
W1
H2O
Ck1
Important Note: If a
Duct sensor is conn-
RS
RS GND
ected to this thermostat
it is suggested that the
fan be programmed for
continuous operation
(step #5, page 11 of the
Owner’s Manual).
Connect directly to R
terminal on backplate.
RS
R
G
Y1
G2
C
H C
R
C
24vac
24 Volt Water
Valves
C
R
G
G
G2(W)
G3(Y)
COM
G2/(W)
G3/(Y)
COM
LO (L1)
L1 (N/A)
HI (HI)
MED (MED)
LO
Page 26
Sample Wiring Diagram
Connection Diagram for Duct Sensor to
T1070 Fan Coil Thermostat
Digital Sensor
High Temp. Heat
Shrink Tubing
5’ Plenum Rated
Cable
White
Black
RS
R
G
Y1
G3
W1
G2
C
Note: It is important to
the black wire from the Duct
Sensor directly to the R
terminal on the thermostat
backplate.
Thermostat
connect
Page 27
Sample Time Clock Wiring Diagram
Important Information About:
Auxiliary Input Control and Multiple HVAC Control
CAUTION
When using the auxiliary input (CK1 & R) or controlling multiple
HVAC units with a
transformer phasing problems that will
operation. Connecting transformers that are not phased
correctly may result in a direct short, which could damage
transformers and/or the
if the units share a common ground with
transformers.
SOLUTION: If possible, phase all HVAC units together.
If phasing is impractical,
the transformers. To isolate the auxiliary
transformer for the auxiliary control device, (time clock depicted
below) Connect the device to an isolation relay coil. Connect
one set of isolated contacts to
See diagram A.
Diagram A- Auxiliary Control
110vac Isolation Relay
Additional relays may be used. Relay coils must be wired in parallel.
Potential Phasing Problems
single thermostat, it is possible to encounter
interfere with thermostat
thermostat. Phasing problems are likely
secondary grounded
isolation relays may be used to isolate
input, use a separate
each thermostat at CK1 and R.
Coil
WARNING
CK 1
Thermostat
R
CK 1
Thermostat
R
CK 1
Thermostat
R
Page 28
Warranty
One-Year Warranty - This Product is warranted to be free from defects in material and
workmanship. If it appears within one year from the date of original installation, whether or not
actual use begins on that date, that the product does not meet this warranty, a new or
remanufactured part, at the manufacturer’s sole option to replace any defective part, will be
provided without charge for the part itself provided the defective part is returned to the distributor
through a qualified servicing dealer.
THIS WARRANTY DOES NOT INCLUDE LABOR OR OTHER COSTS incurred for diagnosing, repairing,
removing, installing, shipping, servicing or handling of either defective parts or replacement
parts. Such costs may be covered by a separate warranty provided by the installer.
THIS WARRANTY APPLIES ONLY TO PRODUCTS IN THEIR ORIGINAL INSTALLATION LOCATION AND
BECOMES VOID UPON REINSTALLATION.
LIMITATIONS OF WARRANTIES – ALL IMPLIED WARRANTIES (INCLUDING IMPLIED WARRANTIES OF
FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY) ARE HEREBY LIMITED IN DURATION TO
THE PERIOD FOR WHICH THE LIMITED WARRANTY IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS
ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE MAY NOT APPLY TO YOU. THE
EXPRESSED WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MAY NOT BE ALTERED,
ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER, OR OTHER PERSON WHATSOEVER.
ALL WORK UNDER THE TERMS OF THIS WARRANTY SHALL BE PERFORMED DURING NORMAL WORKING
HOURS. ALL REPLACEMENT PARTS, WHETHER NEW OR REMANUFACTURED, ASSUME AS THEIR
WARRANTY PERIOD ONLY THE REMAINING TIME PERIOD OF THIS WARRANTY.
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR:
1. Normal maintenance as outlined in the installation and servicing instructions or owner’s
manual, including filter cleaning and/or replacement and lubrication.
2. Damage or repairs required as a consequence of faulty installation, misapplication, abuse,
improper servicing, unauthorized alteration or improper operation.
3. Failure to start due to voltage conditions, blown fuses, open circuit breakers or other
damages due to the inadequacy or interruption of electrical service.
4. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or
other conditions beyond the control of the Manufacturer.
5. Parts not supplied or designated by the Manufacturer, or damages resulting from their use.
6. Manufacturer products installed outside the continental U.S.A., Alaska, Hawaii, and
Canada.
7. Electricity or fuel costs or increases in electricity or fuel costs for any reason whatsoever
including additional or unusual use of supplemental electric heat.
8. ANY SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY OR COMMERCIAL
DAMAGE OF ANY NATURE WHATSOEVER. Some states do not allow the exclusion of
incidental or consequential damages, so the above may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which may vary
from state to state.
T1070 OWNERS & INSTALLATION MANUAL
P/N 88-947
Rev. 2
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