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24 VAC Power – Wiring and Mounting Instructions
This thermostat mounts on a standard 4" x 4" device box with a 2" x 4" horizontal mud ring.
See Figure 1.
1. To avoid electrical shock or damage to equipment, disconnect all power before
installing this thermostat.
2. Remove old thermostat (if applicable):
a. Remove the front cover of old thermostat. With wires still attached, remove backplate
from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and
the wall mounting plate as an assembly.
b. Before removing wires from old thermostat, label each wire with the terminal designation
from which it was attached.
c. Disconnect the wires from the old thermostat one at a time. Do not let wires fall back
into the wall.
3. Mount TW205/TW206 thermostat backplate:
a. Pull wires through the hole of the TW205/TW206 backplate.
b. Attach thermostat backplate to the wall using the enclosed mounting screws. Tighten
screws evenly but do not over tighten.
4. Attach wires to the TW205/TW206 thermostat backplate:
a. Loosen the screws on the terminal block to allow the wires to be inserted easily.
b. Ensure the insulation on each wire is stripped to the proper length, and insert them into
the terminal block as shown in the wiring diagram:
c. Tighten each terminal block screw until the wires are held fi rmly in place. Ensure no
uninsulated wire is exposed.
5. If batteries are to be used for backup, install the batteries into the compartment in the
back of the thermostat.
6. Attach the thermostat to the backplate and install the optional retaining screw provided
with the mounting hardware.
Battery Power Only – Mounting Instructions
If powered by batteries only, the TW205/TW206 thermostat may be mounted at any location.
In this case, a device box is not required.
1. Mount thermostat backplate to the wall using the enclosed mounting screws. Tighten
screws evenly but do not over tighten.
2. Install the batteries into the compartment in the back of the thermostat.
3. Attach the thermostat to the backplate and install the optional retaining screw provided
with the mounting hardware.
Mount backplate to junction
box using two screws
Mounting Backplate and Thermostat to Junction Box
STEP 2 OF 4: THERMOSTAT CONFIGURATION / SERVICE MENU
The installer must confi gure the thermostat to match the installed heating/cooling system.
The Service Menu allows the installer to modify confi guration variables that are not normally
accessed by the end user. The confi guration variables are identifi ed by Menu Number, as
listed in the "Service Menu Functions" table.
Accessing the Service Menu
1. Simultaneously press the ▲ and ▼ buttons, and hold down for 5 seconds. This takes you
into the Service Menu and menu item number "1" will be shown.
2. Push the SYS button to scroll to the Service Menu item number to be confi gured. The item
number that is shown is the one you are selecting.
© COPYRIGHT 2009 PECO, INC. ALL RIGHTS RESERVED.
Backplate
Insert screw to lock main
body to backplate
Snap main body onto backplate
3. Push the ▲ and ▼ buttons to confi gure the selected menu item.
4. To save your confi guration selection and go to the next Menu Number, press SYS .
Saving and Exiting the Service Menu
The Service Menu exits and returns to the user display after 15 seconds of inactivity.
Changed values are automatically saved to permanent memory.
STEP 3 OF 4: WIRELESS CONNECTION TO RW205 RECEIVER
1. Install the RW205 receiver, following the procedure in the "RW205 Receiver Installation
and Operating Instructions" document that came with the RW205.
2. After both the TW205/TW206 thermostat and RW205 receiver are installed, turn on power
to the equipment.
NOTE: If you are installing more than one TW205 and RW205 set nearby each other, you
must only apply power to one set at a time then perform the connection process. This will
prevent unintentional pairing of devices. After the connection process is performed the
TW205 thermostat can remain on.
3. On the thermostat: Go to Service Menu #43 and select "ON". After 15 seconds, the
display will show "99" and begin counting down to 0. This countdown indicates thermostat
is now waiting for a connection request from the RW205 receiver.
4. On the RW205 receiver: Depress the CONNECT button using the tip of a paperclip. (The
CONNECT button is the small hole on the front of the receiver, immediately under the
three device lights. It is not labeled.)
Follow either the (A) or (B) connection process below, whichever applies to your
installation:
(A) Connection process for a new or replacement installation.
If this is a new installation or you are attempting to replace any existing component in a
PECO Wave Wireless System, a 10-second connection process must be performed. A
10-second connection process will erase all previously paired devices from the RW205
memory. Hold the CONNECT button down for 10 seconds. After 5 seconds, some lights
may begin to fl ash. After 10 seconds all 3 lights will stay lit for 1 second and then begin
to fl ash.
(B) Connection process for adding a SW205/206 device to an existing system.
If you are only attempting to add a SW205 occupancy sensor or SW206 door switch
to an existing PECO Wave Wireless System, a 5-second connection process can be
performed. Hold down the CONNECT button for 5 seconds or until the lights begin to
fl ash. If you are attempting to connect a device and its corresponding light does not fl ash
after 5 seconds of holding down the connect button, a 10-second connection process
must be performed.
5. During the connection process, if any light on the RW205 stops fl ashing, this means a
device has been found and successfully paired with. The RW205 will attempt to connect
to any available device for 2 minutes or until all available devices have been paired.
Monitor the thermostat display during the Connection Process. If the display counts down
to 0, the display will return to normal but pairing was unsuccessful and must be attempted
again. If pairing is successful, the thermostat will return to the normal display immediately
and the connection light on the RW205 will stop fl ashing.
STEP 4 OF 4: CHECK THERMOSTAT OPERATION
After thermostat and receiver installation, confi guration, and wireless connection are
complete, check thermostat operation:
• Set fan to ON. The blower should begin to operate.
• Set the System Switch to AUTO, or available selection. Using the ▲ button, adjust
temperature above the room temperature to cycle heating stage(s) on. Using the ▼
button, adjust temperature below the room temperature to cycle cooling stage(s) on.
INTERPRETING THE RW205 INDICATOR LIGHTS
After devices have been paired (wirelessly) to the RW205 the corresponding Indicator
Lights should remain lit. If communication is broken for more than 5 minutes, in the case of
the TW205/206, or 30 minutes for the SW205/206, the Indicator Light associated with that
device will shut off. In the event of a communication loss with the TW205/206, RW205 will
shut off all outputs. If the RW205 loses communication with the SW205 or SW206, it will
assume the room is occupied.
The indicator lights on the RW205 can also be used to diagnose communication problems.
If the RW205 receives valid messages from a connected device, it will blink once. If the
RW205 receives invalid messages, it will blink twice. An invalid message could be caused
by an excessive amount of obstruction between the RW205 and paired devices, or a large
amount of interference from other wireless devices. If the RW205 indicates invalid messages
frequently, review the "Mounting Considerations" section of this guide for more information.
P/N 69512 3220-3139 REV 0 PAGE 2
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