Johnson Controls Interiors TMPSENS2400A User Manual
Installation Instructions WRS-TTx Series
Issue Date June 13, 2005
WRS-TTx Series Radio Frequency (RF)
Wireless Transmitters
Applications
The WRS-TTx Series Wireless Room Temperature
Transmitters are designed to report temperature
and set point (certain models) to a suitable JCI data
receiver. They can be used in two separate types
of control systems, depending on the application.
FCC and Industry Canada Compliance
Compliance Statement (Part 15.19)
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.
Warning (Part 15.21)
Changes or modifications not expressly approved by
the party responsible for compliance could void the
user’s authority to operate the equipment.
Additionally, it is important to remember that the
transmissions used by the WRS-TTx are basically
line-of-site and you should review the likely path of
the RF energy before installation. Generally it is
important to avoid having large areas of metal such
as elevators, duct work, or equipment rooms
between the sensor and the receiver.
An optional signal strength site survey tool receiver
is available to determine the appropriate location of
the WRS Wireless Room Temperature Sensing
System prior to its installation. Using any standard
WRS-TTx transmitter in the rapid transmit mode
(previously described in the section Occupancy
Button and LED), along with the survey tool
receiver TE-7820-100, you can verify that the RF
transmission signal is sufficient to ensure proper
system operation. See Table 1 and refer to the TE-
7820-100 RF Wireless Signal Strength Site Survey
Tool Product Bulletin (LIT-xxxxxxxx) for more
details.
Installation
Observe the following guidelines and see the
To comply with FCC’s RF exposure limits for general population
/ uncontrolled exposure, the antenna(s) used for this transmitter
must be installed to provide a separation distance of at least 20
cm from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
Industry Canada Statement
The term “IC” before the certification/registration
number only signifies that the Industry Canada
technical specifications were met.
Mounting section in this document.
• Transport the WRS-TTx in the original
container to minimize vibration and shock
damage to the WRS-TTx.
• Verify that all parts are shipped with the WRS-
TTx.
• Do not drop the WRS-TTx or subject it to
physical shock.
• Other than the mounting base, do not open
the WRS-TTx. The WRS-TTx has no userserviceable parts inside.
Locating the Transmitters
The wireless design of the WRS-TTx transmitter
allows a great deal of location flexibility without
worrying about installing wiring. It is important to
follow the standard guidelines for
Sensor/Thermostat location so that the sensor is
sensing the true room temperature. It is important
to avoid outside walls, windows, and areas where
sunshine can fall directly on the sensor or where
drafts from HVAC equipment are likely.
© 2005 Johnson Controls, Inc.
Part No. 24-xxxx-xx, Rev. - www.johnsoncontrols.com
Parts Included
• one Wirele ss Transmitter
• two expanda ble wall anchors and two No.
8 pan-head, self-tapping screws
• three strips of double-sided adhesive foam
tape
• one set of Installation Instructions
• two AA alkaline batterie s
1
Tools Needed
• screwdriver for mounting screws
• 1/16 in. (2mm) Allen-head adjustment tool for
small screw that secures transmitter to
mounting base
• small straight blade screwdriver or coin for
unsnapping transmitter from base
Set up/Commissioning
Ensuring the batteries are installed and setting the
DIP switches appropriately are the only actions
required after mounting/installation.
IMPORTANT: Before specifying the
WRS Series RF Wireless Room Temperature
Sensing System for plenum applications, verify
acceptance of exposed plastic materials in
plenum areas with the local building authority.
Building codes for plenum requirements vary by
location. Some local building authorities accept
compliance to UL 1995, Heating and Cooling
Equipment, while others use different acceptance
criteria.
IMPORTANT: Use this WRS Series
RF Wireless Room Temperature Sensing System
only to provide an input to equipment under
normal operating conditions. Where failure or
malfunction of the sensing system could lead to
personal injury or property damage to the
controlled equipment or other property, additional
precautions must be designed into the control
system. Incorporate and maintain other devices
such as supervisory or alarm systems or safety
or limit controls intended to warn of, or protect
against, failure or malfunction of the sensing
system.
Diagram or Picture of the 80 X 120mm Sensor Enclosure with Dimensions
Figure 1: WRS-TTx Series RF Wireless Temperature and Set Point Transmitters
Dimensions, in. (mm)
2 WRS-TTx Series Radio Frequency (RF) Wireless Transmitters Installation Instructions
Accessories
Table 1: Accessories (Order Separately)
Code Number Description
TP2420
TE-7820-100
T-4000-119
Transformer, 120VAC Primary to 24Vac Secondary, 20VA, Wall Plug
RF Wireless Receiver Signal Strength Site Survey Tool
Allen-Head Adjustment Tool (30 per Bag)
Mounting
Hardware is included with each component of the
WRS Series RF Wireless Temperature Sensing
System, allowing for a variety of mounting scenarios.
The preferred mounting method for the transmitter
uses the two expandable wall anchors included with
the unit. Double-sided adhesive foam tape is also
provided with each transmitter for installations where
building retention and its historical preservation are
important, or in buildings featuring marble, granite,
glass, mirrored, wood veneer, or other decorative
surfaces.
Transmitter Location Considerations
Consider the following guidelines when selecting a
mounting location for the WRS-TTx Series
RF Wireless Temperature and Set Point Transmitter:
• Locate the transmitter so that it is easily
accessible.
• Locate the transmitter on the same floor.
(Mounting one floor above or one floor below the
receiver may work, but will dramatically reduce the
RF signal range.)
• Locate the transmitter on an inside wall away from
water pipes and air ducts, minimally 54 in. (1.4 m)
above the floor level, in an area that accurately
represents the temperature of the controlled
space.
• If possible, locate the tra nsmitter in the line of sight
with the receiver, to minimize signal transmission
loss.
• Check that there are no metal objects (including
equipment rooms and elevator shafts) blocking the
RF transmission signal from the transmitter to the
receiver.
• Do not mount the transmitt er in recessed areas, in
shelving units or metal enclosures, or behind
curtains or doors.
• Do not mount the transmitt er in areas that are
exposed to direct sunlight or condensation, or in
areas that are in close proximity to various heat
sources.
• Do not mount the transmitt er in areas susceptible
to warm or cool drafts such as lobbies, walkways,
or near a bank of computers.
• Do not mount the transmitter less than 2 ft (0.6 m)
from the receiver.
• The distance between two or more transmitter
mounting locations is irrelevant.
Removing the Transmitter from its Mounting Base
The WRS-TTx Series Transmitter ships from the
factory pre-assembled to its mounting base. In order to
secure the assembly to a surface, the transmitter must
first be removed from its mounting base (as illustrated
in Figure 2).
Diagram of Sensor Transmitter Cover and Base
Figure 2: Removing the Transmitter from its
Mounting Base
WRS-TTx Series Radio Frequency (RF) Wireless Transmitters Installation Instructions 3
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