Johnson Controls WRZ-7860-0 Installation Instructions Manual

WRZ-7860-0 Receiver for One-to-One Wireless Room

24- 10563-47, Rev. E

Sensing Systems

Installation Instructions

WRZ-7860-0

Refer to the QuickLIT website for the most up-to-date version of this document.

Part No. 24-10563-47, Rev. E

Issued January 2017

Applications

The WRZ-7860-0 Receiver for One-to-One Wireless Room Sensing Systems is designed to receive wireless Radio
Frequency (RF) temperature and humidity data from WRZ Series Wireless Room Sensors, and to provide single
zone control data to specified Metasys® system digital controllers in building HVAC systems. The WRZ Series
Wireless Room Sensor and WRZ-7860-0 Receiver combination is a functional equivalent to a network sensor,
such as an NS-BTP7001-0, but eliminates commu nic ations wiring (that is usually placed inside the wall) between
the room sensor and receiver.

Like a network sensor, the WRZ-7860-0 Receiver is designed to communicate over a Sensor Actuator (SA) Bus
interface via Master-Slave/Token- Passing (MS/TP) BACnet® protocol with Johnson Controls® Varia ble Air V olum e
(VAV) Modular Assembly (VMA) 16 Series Controllers and Field Equipment Controllers (FECs). The receiver
supplies the sensed zone temperature and humidity, temperature setpoint, and occupancy override data.

In a typical application, one WRZ Series Wireless Room Sensor report s to one WRZ-7860-0 Receiver; however, up
to five WRZ Series Wireless Room Sensors can be associated with a sing le WRZ-7860-0 Receiver. In multi-sensor
applications, the receiver passes all the room sensors’ data to the controller. The VMA16 Series Controller or FEC
can be configured to either average the room sensors’ temperature and humidity input, or select the highest or
lowest sensed temperature and humidity for control of the target zone.

The WRZ-7860-0 Receiver uses direct-sequence, spread-spectrum RF technology, and operates on the 2.4 GHz
Industrial, Scientific, and Medical (ISM) band. The receiver meets the IEEE 802.15.4 standard for low power, low
duty cycle RF transmitting systems. A WRZ-7860-0 Receiver operates as a transceiver, to create a bidirectional
association with a WRZ Series Wireless Room Sensor.

Refer to the WRZ-7860-0 Receiver for One-to-One Wireless Room Sensing Systems Technical Bulletin
(LIT-12011641) for information on commissioning the WRZ-7860-0 Receiver and configuring One-to-One wireless

room sensing systems.

IMPORTANT: The WRZ-7860 Receiver is intended to provide an input to equipment under nor mal operating
conditions. Where failure or malfunction of the receiver 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 WRZ-7860 Receiver.

IMPORTANT : Le WRZ-7860 Receiver est destiné à tran smet tre d es donné es entr antes à un équ ipement da ns
des conditions normales de fonctionnement. Lorsqu'une défaillance ou un dysfonctionnement du receiver risque
de provoquer des blessures ou d'endommager l'équipement contrôlé ou un autre équipement, la conception du
système de contrôle doit intégrer des dispositifs de protection supplémentaires. V eiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou des dispositifs de
sécurité ou de limitation, ayant une fonction d'avertissement ou de protection en cas de défaillance ou de
dysfonctionnement du WRZ-7860 Receiver.

WRZ-7860-0 Receiver for One-to-One Wireless Room Sensing Systems

Installation Instructions

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North American Emissions Compliance

United States

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 interferenc e re ce ived, 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.

Canada

Industry Canada Statement(s)

The term IC before the certification/registration number only signifies that the Industry Canada technical
specifications were met.

Le terme « IC » précédant le numéro d'accréditation/inscription signifie simplement que le produit est conforme
aux spécifications techniques d'Industry Canada.

Installation

Follow these guidelines:

• Transport the WRZ-7860-0 Receiver in the original container to avoid vibration and shock damage to the
receiver.

• Verify that all the parts shipped with the receiver.

• Do not drop the receiver or subject it to physical shock.

Use the following procedure to mount, wire, and prepare the receiver for operation:

1. Mount the mounting base. See Mounting

2. Set the DIP switches. See Setup and Adjustments

3. Align the tabs on the edge of the mounting base with the slots on the edge of the receiver housing, and rotate
the assembly onto its mounting base as illustrated in Figure 3.

4. Use a 1/16 in. (1.5 mm) Allen wrench or Johnson Controls T-4000-119 Allen-Head Adjustment Tool to tighten
the tamper-resistant set screw and fasten the receiver encl os ur e to the m ou nt ing bas e.

Note: To avoid damaging the unit, do not overtighten the set screw.

5. Connect the SA Bus cable from the controller to the WRZ-7860-0 Receiver. See Wiring

.

.

.

Parts Included

The following parts are included:

• one WRZ-7860-0 Receiver with double-sided adhesive foam tape factory-installed on the back of the unit

• one installation instructions sheet

WRZ-7860-0 Receiver for One-to-One Wireless Room Sensing Systems Installation Instructions

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Dimensions

Figure 1: WRZ-7860-0 Receiver Physical

Features and Dimensions, in./mm

Tampe r Re sistant
Set Screw

Back of Base to

Front of D om e

1-1/2

38

FIG:wrz_7860_dmnsn s

S
A

R
F

Status Light-Emitting
Diodes (LE Ds)

RJ-12 Port for SA Bus
Connection (on Underside)

3-5/32

80

3-5/32

80

Figure 2: Correct Mounting Orientation

FIG:wrz_7850_mntng_orntn

S
A

R
F

S

A

R

F

Mounting

Location Considerations

Follow these guidelines when locating a WRZ-7860-0 Receiver:

• Locate the receiver so that it is easily accessible within the proximity of the field controller, typically on a VAV
duct, or just above or just below the ceiling tiles.

Note: Communication cables of various lengths are available to connect the receiver SA Bus; see Table 3 for
more details.

• Locate the receiver up to 100 ft (30 m) from the WRZ Series Wireless Room Sensor in a typical building
environment.

• Locate the receiver near the center of the associated room sensor layout in multi-sensor applications.

• Locate the receiver on the same floor or building level as the associated room sensor.

• Locate the receiver in the direct line-of-sight with the room sensor whenever possible. Signal transmission is
best if the path between the room sensor and r eceiver is as direct as p ossible. Line-of-si ght is desirable b ut not
required, as long as the path is not blocked by large metal objects.

• Mount the receiver so that the antenna symbol (shown on the cover near the LEDs) is in a vertical orientation,
up or down. The antenna symbol indicates the appro ximate location of the receive r’s internal onboard antenna.

• If the receiver is mounted on duct work, such as a VAV box, ideally the antenna portion of the receiver
(approximately 1/3 of the enclosure) should hang below th e d uct wo rk. Avoid having pipes, duct work, or other
metal obstructions in the direct line-of-sight to the room sensor.

WRZ-7860-0 Receiver for One-to-One Wireless Room Sensing Systems Installation Instructions

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