Venstar EXPLORER Manuale tecnico
1
Thank You
Congratulations and thank you for purchasing
your new Venstar EXPLORER®thermostat. This
guide is intended to help you install and setup
the basic features of the EXPLORER®Thermostat.
For a full owner’s manual and installation guide,
visit Venstar.com.
2
Compatibility
Venstar EXPLORER®Thermostat is designed to work with 24V systems
requiring both the R & C wires. This includes gas, electric, oil, forced
air, variable speed, heat pump and radiant heat. It can control:
• Heating: one, two and three stages (W1, W2, W3)
• Cooling: one and two stages (Y1, Y2)
• Heat pump: with auxiliary and emergency heat (Y, W1, O/B)
• Fan (G)
• Power (C, R)
• Humidifier or dehumidifier (HUM, DEHUM)
• Dual fuel systems (heat pump with furnace, T3900 only)
• Whole-home humidifiers and dehumidifiers
WiFi Network
& Password
Screw Driver Pencil
Leve
lP
liers
Hammer or Drill
(3/16" or 7/ 32" drill bits)
Thermostat Thermostat
Base
Drywall Anchors
and Screws
This Quick Start
Manual
Contents
Necessary Tools
3
Step 1 - Power O Current System
1) Go to your home’s circuit breaker panel
and switch the furnace and air conditioner
breakers o.
2) To confirm power is o, adjust the
temperature on your current thermostat.
If the system does not respond
accordingly, power has probably been
successfully shut o.
WARNING: Failure to follow this step can result in personal
injury and/or death from shock and electrocution.
Step 2 - Remove Faceplate
Remove the faceplate of current system. Most faceplates snap-o or
feature small screws that will need to be removed.
WARNING: If you see large thick
electrical wires, wire nuts, or if your
system is labeled 120V or 240V DO
NOT PROCEED. THIS THERMOSTAT
IS NOT COMPATIBLE WITH THESE
SYSTEMS
WARNING: Failure to follow this step
can result in personal injury and/or
death from shock and electrocution.
Side View
Wall Thermostat
4
Step 3 - Before you go any further
Determine what your existing wiring and equipment situation is
before you disconnect any wires. If you are unsure of what type of
system you have, you may need to seek professional support.
A. If you have a Heating only system without Air Conditioning, the
Venstar EXPLORER thermostat will require 3 wires. These 3 wires
are: R (24Vac), C (24Vac) and W (Heat). Most Heating only systems
use very simple thermostats that only require 2 wires the R (24Vac)
and W (Heat). The EXPLORER thermostat requires 3 wires to the
thermostat. In this case an Add-A-Wire accessory will not work
and it will be necessary to install another wire for the C (24Vac)
connection.
B. If you have a single stage fossil fuel heater with air conditioning,
the Venstar EXPLORER will require 5 wires for independent fan
control. They are R (24Vac), C (24Vac), W (Heat), Y (Cooling), and G
(Fan). You may connect only 4 wires, as instructed below, to the
EXPLORER but will give up independent fan control. The fan will
still operate with a Heating or Cooling demand.
• If there are only 4 wires present that are connected to the existing
thermostat, there are at least 3 options available to connect the
Venstar EXPLORER thermostat, they are:
1. Use the 4 wires as instructed below and note that the fan will
only operate with a Heating or Cooling demand.
2. Pull new thermostat wire from the HVAC equipment to the
thermostat so that there are at least 5 wires available.
3. Purchase and install a Venstar Add-A-Wire accessory
(ACC-0410).
5
C. If you have a multi stage HVAC system comprised of a fossil fuel
heater with air conditioning the Venstar EXPLORER will require the
5 wires mentioned above (R, C, W, Y, and G) plus an additional wire
for each additional stage of Heating or Cooling. You may reduce
the 5 wire requirement to 4 if you give up independent fan control,
or use the optional accessory; Add-A-Wire.
D. If you have a heat pump without aux heat the Venstar EXPLORER
will require 5 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve), Y
(1st stage compressor), and G (fan). If there are only 4 wires present
that are connected to the existing thermostat, there are at least 3
options available to connect the Venstar EXPLORER thermostat,
they are:
1. Use the 4 wires as instructed below and note that the fan will
only operate with a Heating or Cooling demand.
2. Pull new thermostat wire from the HVAC equipment to the
thermostat so that there are at least 5 wires available.
3. Purchase and install a Venstar Add-A-Wire accessory (ACC-0410).
E. If you have a heat pump with aux heat the Venstar EXPLORER will
require 6 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve), Y (1st
stage compressor), W2 (Aux Heat) and G (fan). If there are only 5
wires present that are connected to the existing thermostat, there
are at least 3 options available to connect the Venstar EXPLORER
thermostat, they are:
1. Use the 5 wires as instructed below and note that the fan will
only operate with a Heating or Cooling demand.
2. Pull new thermostat wire from the HVAC equipment to the
thermostat so that there are at least 6 wires available.
3. Purchase and install a Venstar Add-A-Wire accessory (ACC-0410).
6
MAKING 4 WIRES WORK when 5 are required
(without the optional Add-A-Wire accessory)
• If you have an all-electric heat system with air conditioning, this
method is not an option. You must either pull new wire or use the
optional Add-A-Wire accessory (ACC-0410).
• If you have a single stage fossil fuel heater with air conditioning,
and you would like install the Venstar EXPLORER using only 4 wires,
follow the directions below. You will need a screwdriver along with
a 3” or 4” long piece of thermostat wire to use as a jumper.
1. Make sure the power is o as step 1 on page 4 instructs you.
2. Follow step 4 on page 9 “Label and Disconnect Wires” at the
thermostat. Please note the color and the corresponding wire
designator with each color. An example is the R wire is red and the
W wire is white and so on. You will need this for the next step at
the HVAC equipment.
3. At the equipment end of the thermostat wires, locate the
terminals that the wires are attached to.
A. Remove the “G wire” from the terminal marked G.
B. Place the “G wire” on terminal C.
C. Place one end of the jumper on terminal G.
D. Place the other end of the jumper on terminal Y.
Please note that there will be more than 1 wire on terminal Y.
4. Connect the wires to the terminals on the EXPLORER backplate
taking care to make sure that each wire from the HVAC equipment
is connected to the same terminal designation on the EXPLORER
backplate. For example: the “C wire” from the HVAC equipment
should be connected to the “C” terminal of the thermostat. The
“R” wire on the equipment terminal should be connected to the
“R” terminal on the EXPLORER backplate, and so on.
7
MAKING 5 WIRES WORK when 6 are required
(without the optional Add-A-Wire accessory)
• If you have an all-electric heat system with air conditioning, this
method is not an option. You must either pull new wire or use the
optional Add-A-Wire accessory (ACC-0410).
• If you have a multi stage system that requires 6 wires, and you
would like install the Venstar EXPLORER using only 5 wires, follow the
directions below. You will need a screwdriver along with a 3” or
4” long piece of thermostat wire to use as a jumper.
1. Make sure the power is o as step 1 on page 6 instructs you.
2. Follow step 4 on page 9 “Label and Disconnect Wires” at the
thermostat. Please note the color and the corresponding wire
designator with each color. An example is the R wire is red and the
W wire is white and so on. You will need this for the next step at
the HVAC equipment.
3. At the equipment end of the thermostat wires, locate the
terminals that the wires are attached to.
A. Remove the “G wire” from the terminal marked G.
B. Place the “G wire” on terminal C.
C. Place one end of the jumper on terminal G.
D. Place the other end of the jumper on terminal Y.
Please note that there will be more than 1 wire on terminal Y.
E. Connect the wires to the terminals on the EXPLORER backplate
taking care to make sure that each wire from the HVAC
equipment is connected to the same terminal on the EXPLORER
backplate. For example: the “C wire” from the HVAC equipment
is connected to the “C” terminal of the thermostat and so on.
8
Step 4 - Label & Disconnect Wires
1) One by one, apply a label
designated to each wire
you disconnect from
your current thermostat.
TIP: Before disconnecting any wires,
take a photo of your current wire
configuration with your mobile device.
Wire from the Install on the
old thermostat Function new thermostat Wire
terminal marked connector marked Color
G or F Fan G
Y1, Y Cooling Y1
W1, W Heating W1/0/B
Rh, R, M, Vr, A Power R
C Common C
O/B Rev. Valve W1/O/B*
W2 2nd Stage Heat W2
Y2 2nd Stage Cooling Y2
W3 3rd Stage Heat W3
H, Hum Humidity HUM
D, Dehum Dehumidity DEHUM
Ck1 Dry Contact Switch DRY CONTACT
CKGND Dry Contact Switch DRY CONTACT
* O/B is used if your system is a Heat Pump.
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