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Table of Abbreviations
AP Access Point RF base station module
ED End Device RF Wallstat or Remotestat
LI Link Remote device mode
LIM Link Mode MLM Tool mode
MLM Multi Loop Modular VAV distributed control system
RF Radio Frequency
RS Remotestat RF thermostat no display
RSSI Receive Signal Strength Indication Signal strength
SA Share Address Mode Remote Device mode
SAM Share Address Mode MLM Tool mode
SP Set Point Temperature control point
WS RF Wallstat RF wall mounted Thermostat with LCD
Table of Contents
Table of Abbreviations 2
MLM RF Overview 3
Installation and Commissioning 3
Hardware Installation 3
Commissioning 3
Link remote units to the correct AP 4
Zoning of the Remote units 7
Verify and Replace End Devices 10
Removing an End Device 11
Moving End Device to a different Zone 13
Wallstat Operation 14
Adjust the Wallstat Setpoint 14
15 Put the Wallstat in sleep mode (Default state)
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MLM RF Overview
The MLM RF consists of the following hardware units: an Access Point, the RF Wall Thermostat (Wallstat) and a
RF Remote Sensor (Remotestat). These hardware units in combination with the MLM Tool rev 8.xx application
software forms the MLM RF system.
The MLM RF system allows for the remote placement of Wall thermostats and temperature sensors without ca-
bling restrictions. The installation will typically comprise one Access point per Power Supply Unit connecting re-
motely to a maximum of 15 Wall Thermostats or Remote Sensors, allowing for up to 60 remote units per MCU.
See ‘MLM Integration with BMS’ issue 3 document.
The Access point is powered by the MLM bus. The remote units are each powered by a pair of Lithium AAA
batteries, with a typical unit operational life of 5 years. To conserve power, the RF communication between units
is adaptive and could vary between 1 and 10 minutes, depending on the operational requirements of the con-
trol system. During commissioning however, this period is reduced to a few seconds.
The following MLM RF hardware models are available:
BU2011-2 MLM 24 RF Access Point
BU2111-2 MLM 24 RF Wallstat
BU2211-2 MLM 24 RF Remote Thermostat
Installation and Commissioning
The MLM RF units are fitted onto a standard MLM 24 installation. It interfaces to the MCU 2 V6.16, with the
MLM Tool V8.13 (Application) used for commissioning and diagnostics.
Note when reference is made in this document to the End Device it refers to both the Wallstat and Remotestat
devices. The main difference between devices being the Wallstat contains an LCD display.
Hardware Installation
The RF system requires an AP (Access Point) to be installed within a 50 meter radius of the remote units, either
Wallstat or Remotestat. One AP can be installed per Power Pack unit at any point on the MLM24 slave cabling
link. Ensure the AP is installed at a central vantage point, normally inside a ceiling void. Ensure the antennae
wire protruding from the AP enclosure is flexed in a vertical position. Install the AP at least one meter away
from any sheet metal objects. Ensure the AP is securely fixed.
A maximum of 15 Wallstats or Remotestats can be installed per AP. Any combination of Wallstat and Re-
motestat is allowed, provided the total does not exceed 15 units. Please follow the installation instruction pro-
vided on how to fit the remote unit back shell to a wall. Fit two of the correct battery types to each remote unit,
ensuring the correct polarity as indicated. The batteries to be used are 1.5V AAA lithium cells available off the
shelf. Clip the remote unit onto the back shell. The remote unit will be in sleep mode and the LCD screen will be
off.
Commissioning
The following describes a two stage process. First is to Link the remote RF units to the correct Access Points.
Following that the remote units needs to be correctly zoned.
Ensure the MLM network is powered up and running, with the MLM Tool connected to the section (MCU) con-
taining the RF units to be linked. Verify that all the wired nodes are visible in the MLM project. Verify the Ac-
cess Points are visible as indicated.
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Link remote units to the correct AP
From the menu select ‘Wizard/Access Point/Add End Device’ as shown in this image.
A list of Access Points will show. Select the AP you wish to bind Remote Devices to.
Click Next.
The Access Point is now ready to Link to selected Remote devices.
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The paired Wallstat count will now be displayed, with ‘ED’ showing the total number of End Devices connected
to the Access Point and ‘UD’ showing the number of those connected End Devices that has not been saved to
the system.
The next step is to go to a Remote Device to be paired with an Access Point. Note the Wallstat must be in sleep
mode indicated by a blank display.
PressMENU/UPforat
least2secondstowake
upaWSfromsleepmode.
Theunitwillbrieflyenterthe‘SA’(save
address)modewiththedigits‘SA’
flashing.Noteiftheunitdoesnotexit
thismode,thecommunicaonlink
betweenAPandRemoteDeviceis
inadequate.
LinkMode:While
waingfortheAccess
PointtoLINK,thedigits
‘LI’andtheantennae
iconwillflash.
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The paired Wallstat count will now be displayed, with ‘ED’ showing the total number of End Devices connected
to the Access Point and ‘UD’ showing the number of those connected End Devices that has not been saved to
the system.
Repeat the process until all the Wallstats required to connect to the selected Access Point is shown on the
paired count.
Press ‘Apply’ to save the UD (unsaved) Wallstat devices to the system. Note the Access Point now re-connects
to the Wallstats in a permanent binding (Link) mode. This process can take a few minutes to complete.
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During this process the Wallstat display will now revert from Link mode to the normal operating mode. Note the
RSSI indicator in the top left display and the RF icon permanently on.
Zoning of the Remote units
The next step is to group each Wallstat to a specific diffuser in a control zone. By connecting a Wallstat to a
diffuser, it is grouped to the zone that diffuser belongs to. Any one diffuser in a zone can be selected for
matching to a Wallstat.
Select the first Wallstat in the Wallstat column. In the node panel select Wireless/Group Wireless…
Once completed, the Wallstat icons are now grouped to the right of the Access Point on the Network screen.
Note also our saved Wallstat (End Device) count of 3 on the Access Point icon.
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Repeat the process to group the other two Wallstats as well. Note the bottom left two diffusers are zoned to-
gether in zone 3...
Notice the Wallstat icon is now to the left of the Access Point icon. It now also combines with the diffuser on
the left to form the master controller for that control zone.
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..as depicted in the Physical view.
Verify and Replace End Devices
To check the RF network status and health, select ‘Wizards/Access Point/ RF Network Status’.
The Network Status Display is divided into two parts. The top part displays the Access Point status, listing the 4
Access Points on the network (one per channel). Battery and RSSI status indicated as ‘High’ means the level de-
tected for the End Devices connected to that Access Point is ok, with a ‘Low’ requiring identification of the par-
ticular End Device in the bottom half of the screen.
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The bottom part lists all the End Devices on the network. To conserve power, the transmit intervals from End
Devices to the Access Point is adapted to the operational requirements, alternating from a few seconds to a
maximum of 10 minutes. The first Wallstat listed here indicates a transmit interval of 660 seconds, which effec-
tively means a communications break between Access Point and Wallstat. This status will be flagged as an ‘Error’
on the main system status display.
Depicted below is a Wallstat shown after a timed out communication (bottom). Notice the room temperature of
zero degrees on the Wallstat icon with the diffuser in heating mode. After a minute the diffuser will revert to a
neutral (idle) mode with re-heater switched off.
Removing an End Device
To remove a faulty or not responding End Device from the network, click on Wizards/Access Point/Refresh Net-
work.
Select the Access Point of Interest.
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Press the ‘Next’ button. Note this action involves entering the ‘Link’ mode again and in the process any non-
responsive End Devices will not show up on the count list. Allow up to 10 minutes for this process as the End
Device’s adaptive response time could be set at 10 minutes.
The number of paired devices is now reduced to two.
Save the two End Devices to the network.
The two Wallstats that were already Linked and zoned have retained their zone positions, with the unresponsive
Wallstat removed. Note this process involved a network reset with the diffusers shown in the initialize state.
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Click on the Wallstat icon. The zoning process can now proceed as indicated below.
Wallstat Operation
Adjust the Wallstat setpoint
ENTERDOWN
UP
MENU
PresstheMENUbuontogoto
theSPEDITscreen.
PressENTERtoexitthe
SPmode.
PressUP/DOWN
toadjusttheSP.
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Put the Wallstat in sleep mode (Default state)
PressMENU/UPtoaccess
thehiddenMENU
PressMENUtoenterAP
ADDRESSDELETEMENU
UP
MENUMENU
PressENTERtodeletetheAP’saddress
fromtheWSandtoenterlowpower
modeagain.TheWSscreenwillblank.
ENTER
/