Venstar T1050 User manual

Venstar Inc. 08/07
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 2 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
Thermostat
Thermostat
residential
T1050
HEAT
COOL HEAT
PUMP
PROGRAMMABLE
5+2 Day
PROGRAMMABLE
5+2 Day
up to
& 2-cool
up to
& 2-cool
2-heat
2-heat
THERMOSTAT
Control up to 2 heat & 2 Cool Stages
4 Settings Per Day
Self-prompting programming
Auto changeover
Separate weekday, Saturday
& Sunday programming
Digital
Digital
Back-Lit display
One For All Works with
Virtually All Equipment
5 minute Built-In
Compressor Protection
Non-Volatile memory
Dual setpoint with
adjustable deadband
Keypad lockout
‘O’ or ‘B’ Terminal
Display either F or C
INSTALLATION
INSTRUCTIONS
INSTALLATION
INSTRUCTIONS

Table Of Contents
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.
P/N T1050
Venstar Inc. 08/07
Page 1
Step #1: Preparation
Step #2: Remove & Replace
Old Thermostat
Step #3: Wire Connections
Step #4: Test Operation
Trouble Shooting
2
3
4
12
13
CAUTION Follow Installation Instructions carefully.
DISCONNECT POWER TO THE HEATER -
AIR CONDITIONER BEFORE REMOVING
THE OLD THERMOSTAT AND INSTALLING
THE NEW THERMOSTAT.
WARNING
Sample Wiring Diagrams
5

Drill with 3/16
inch Drill Bit
(when not using
j-box)
Proper installation of the thermostat will be
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.
Flat Blade
Screwdriver
Wire cutter
& Stripper
Make sure your Heater/Air Conditioner is
working properly before beginning installation
of the thermostat.
Carefully unpack the thermostat. Save the
screws, wall anchors, and instructions.
STEP #1
PREPARATION
Turn off the power to the Heating/Air
Conditioning system at the main fuse panel.
Most residential systems have a separate
breaker for disconnecting power to the furnace.
Page 2

Remove the cover of the old thermostat.
If it does not come off easily check for
screws.
Loosen the screws holding the thermostat
base or subbase to the wall, and lift away.
Disconnect the wires from the old
thermostat. 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, until your new thermostat is
functioning properly.
STEP #2
REMOVE & REPLACE OLD THERMOSTAT
Page 3

STEP #3
WIRE CONNECTIONS
If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
* C may not be used on all systems.
** O/b is used if your system is a Heat Pump.
Wire from the
old thermostat
terminal marked Function
In st al l on t he
new thermos tat
connector marked
G or F Fan G
Y1, Y or C Cooling Y1
W1, W or H Heating W1,O,B
W1,O,B**
PowerRh, R, M, Vr, A R
C
O/b
C *
Common
Rev. Valve
Y2 Y2
W2 W2
2nd Stage Cool
2nd Stage Heat
Page 4

C
G
RY1W2 W1
O
B
Y2
Sample Wiring DiagramsSample Wiring Diagrams
*If using first stage electric heat, this option must be
selected ON (see page 12, step 5 of Owner’s Manual).
Gas or Electric Heat
5 Wire, 1 Stage Cooling, 1 Stage Gas Heat Residential Gas or Electric Heat*,
Electric Cool, split systems & package
units
POWER
R
COMPRESSOR
Y
W
GAS VALVE
or
STRIP HEAT
COMMON
C
FAN
G
Page 5

C
G
RY1W2 W1
O
B
Y2
Sample Wiring Diagrams
Gas or Electric Heat
4 Wire, 1 Stage Cooling, 1 Stage Gas Heat Residential Gas or Electric Heat*,
Electric Cool, split systems & package
units
POWER
R
COMPRESSOR
Y
W
GAS VALVE
or
STRIP HEAT
FAN
G
*If using first stage electric heat, this option must be
selected ON (see page 12, step 5 of Owner’s Manual).
Page 6

C
G
RY1W2 W1
O
B
Y2
Sample Wiring Diagrams
Gas or Electric Heat
6 Wire, 2 Stage Cooling, 1 Stage Gas Heat Residential two stage cooling with
Gas or Electric Heat*.
POWER
R
COMPRESSOR
Y
2nd STAGE
COOLING
Y2
COMMON
C
FAN
G
W
GAS VALVE
or
STRIP HEAT
*If using first stage electric heat, this option must be
selected ON (see page 12, step 5 of Owner’s Manual).
Page 7

C
G
RY1W2 W1
O
B
Y2
Sample Wiring Diagrams
Gas or Electric Heat
6 Wire, 1 Stage Cooling, 2 Stage Heat Residential & commercial 1 Stage Cooling,
with 2 Stage Gas or Electric Heat*
POWER
R
COMPRESSOR
Y
W
GAS VALVE
or
STRIP HEAT
COMMON
C
FAN
G
2nd STAGE
HEATING
W2
*If using first stage electric heat, this option must be
selected ON (see page 12, step 5 of Owner’s Manual).
Page 8

C
G
RY1W2 W1
O
B
Y2
Commercial Gas or Electric Heat *,
Electric Cool, split systems & package units
including Commercial Heat Pumps **
Sample Wiring Diagrams
Gas or Electric Heat
7 Wire, 2 Stage Cooling, 2 Stage Heat
*
selected ON (see page 12, step 5 of Owner’s Manual).
** Commercial heat pumps do not have the heat pump turned
ON in advanced setup (see page 11, step 3 of Owner’s Manual).
If using first stage electric heat, this option must be
POWER
R
COMPRESSOR
Y
2nd STAGE
COOLING
Y2
FAN
G
2nd STAGE
HEATING
W2
COMMON
CW
GAS VALVE
or
STRIP HEAT
Page 9