Specifications
E) Remote Mounting (Wall Mounting)
The dual-mount thermostat is factory mounted on the control panel. This thermostat may be mounted in
the space for setpoint control and to sense the space temperature. This thermostat may be mounted
directly to a wall, a 2x4 electrical box, a 1/4 DIN electrical box, or a surface mount electrical box.
The sensor link (S-LK) wiring requires at least 24 gauge, twisted pair, voice grade telephone wire.
Shielded wire is not required; however, this cable type is recommended. The maximum wire length is
200 ft. The capacitance between conductors cannot be more than 32 pF per foot. If shielded cable is
used, the capacitance between any one of the conductors and the other conductors (connected to the
shield) cannot exceed 60 pF per foot.
The sensor link wiring and any LON network wiring, must have dedicated wire pairs. These wire pairs
must not be part of an active, bundled telephone trunk. The sensor link wiring and LON wiring should
not be routed with any Class 1 power wiring. The sensor link wiring may be routed with any of the low
voltage controller wiring, including LON. LON wiring must not be routed with any of the low voltage
controller wiring, except the sensor link wires.
The thermostat subbase provides terminals for the sensor link wiring and LON network wiring. These
terminals are used connect the LON jack on the subbase to the LON network. The thermostat does not
connect to the LON network. If these optional terminals are used with shielded wire, the shield should
be connected to the shield of the network conductors at the controller. The LON network shield must be
connected to earth ground through a 470-ohm resistor at only one end of the network.
To remotely mount the thermostat:
(1) Disconnect Unit power.
(2) Unsnap the thermostat faceplate from the subbase. Remove the thermostat faceplate by placing the
thumb in the center of the thermostat and pulling on the top edge of the plate.
(3) Unscrew the two small screws that secure the thermostat to the subbase.
(4) Disconnect the yellow S-LK wires from the S-LK terminals of the unit controller and from terminals 1
and 2 of the subbase.
(5) Remove the two screws that hold the subbase to the controller mounting plate.
(6) Move the subbase to the mounting location and feed the sensor link (S-LK) and LON wires (if used)
through the back of the subbase.
(7) Mount the subbase. The wiring terminals should be at the top end of the subbase. For direct wall-
mount, 2x4 box mount, and surface mount boxes, use mounting holes 1 and 3. For 1/4 DIN boxes,
uses mounting holes 1 and 2. See Figure 2. Use the appropriate flathead screws, such as 6-32 x
5/8", to attach the subbase to the box or wall. When attaching to directly to drywall, use anchors as
necessary.
(8) The sensor link wires (S-LK or U-link) connect to subbase terminals 1 and 2; these wires are not
polarity sensitive. If used, the LON wires connect subbase terminals 3 and 4; these wires are not
polarity sensitive. Connect the S-LK wires to the S-LK terminals of the controller. If used, connect
the LON wires to the LON terminals of the controller.
(9) Push the excess wire back through the subbase and insulate the opening to minimize air drafts from
an unconditioned space.
(10) Hold the t'stat with the display out and oriented towards the top of the t'stat. Set the t'stat circuit
board so that the bottom edge is captured by the mounting hooks near the bottom of the subbase.
(11) Secure the t'stat to the subbase by tightening the two small screws near the top, outer edge of the
t'stat.
(12) Snap the faceplate back onto the t'stat. Snap in the bottom edge first and then the top edge.
(13) If using the t'stat to detect space temperature, disconnect the unit mounted room air temperature
sensor (RAT) from the controller (terminals UI1 and COM).
(14) Apply unit power and verify t'stat operation.
7/1/03 Part Number 011-200001-003 Page 3