Viega RABS 2804 User manual

Installation Manual
Radiant Auto-Balancing System (RABS)
For Radiant Heating Systems
03.2021

Circuit Control MechanismCircuit Control Mechanism
Loop/Circuit# Location Control Mechanism Examples
Loop / Circuit #1: Basement | Thermostat #1
Loop / Circuit #2: Hallway | Power Level
Loop / Circuit #3:
Front Room (South) | Thermostat #2
Loop / Circuit #4: Front Room (North) | Thermostat #2
Loop / Circuit #5:
Loop / Circuit #6:
Loop / Circuit #7:
Loop / Circuit #8:
Loop / Circuit #9:
Loop / Circuit #10:
Loop / Circuit #11:
Loop / Circuit #12:
Hardware Identi󶈵cation Information for the Installer and End User
Component Color Serial Number
Control Unit Black
Thermostat #1
Thermostat #2
Thermostat #3
Thermostat #4
Thermostat #5
Thermostat #6
Thermostat #7
Thermostat #8
Range Extender #1
Range Extender #2
WLAN Module Black
Password:

Table of Contents
3 IM-HC 599871 0321 RABS
Table of Contents
1 About this Document _______________ 8
1.1 Disclaimer ___________________________________8
1.2 Symbols Used _______________________________8
1.3 Audience ____________________________________9
1.4 Safety Notices _______________________________9
2 Product Information _______________ 10
2.1 Standards and Regulations __________________ 10
2.2 Intended Use ______________________________ 11
2.3 Product Description ________________________ 12
2.3.1 Functions and Features_________________________ 12
Operation Methods _________________________________ 12
Features ___________________________________________ 13
2.3.2 Component Overview and Description ___________ 13
Component Overview _______________________________ 13
Control Unit ________________________________________ 14
Powerhead ________________________________________ 15
Return Sensor Port _________________________________ 15
Circuit Hub ________________________________________ 16
Thermostat ________________________________________ 17
WLAN Module _____________________________________ 18
2.3.3 Accessories __________________________________ 19
Range Extender ____________________________________ 19
Power Adapter for Range Extenders and/or Thermostats 20
2.4 Technical Data _____________________________ 21
2.4.1 Speci󶈵cations for Electronic Components ________ 21
2.4.2 End Device Software and Network Requirements _ _ 25
2.5 System Requirements ______________________ 25
2.5.1 Hardware _____________________________________ 25
Manifolds __________________________________________ 25
Power Requirements ________________________________ 25
LAN Connection ____________________________________ 25
End Devices _______________________________________ 26
2.5.2 Software _____________________________________ 26
2.6 Operation Methods _________________________ 26
2.6.1 Method 1 — Zone Control via Power Level ________ 27
2.6.2 Method 2 — Zone Control via Thermostat ________ 27
2.6.3 Method 3 — Local Operation via Software ________ 28
2.6.4 Method 4 — Remote Operation via Software ______ 28
3 Installation and Assembly __________ 29
3.1 Transportation and Storage __________________ 29
3.2 Assembly Information _______________________ 29
3.2.1 Installation Requirements _______________________ 29
Power _____________________________________________ 29
Manifolds __________________________________________ 29

Table of Contents
4 IM-HC 599871 0321 RABS
3.2.2 Installation Dimensions _________________________ 30
Control Unit ________________________________________ 30
Powerhead ________________________________________ 30
Circuit Hub ________________________________________ 30
Thermostat / Range Extender ________________________ 31
WLAN Module _____________________________________ 31
3.3 Installation and Assembly Instructions ________ 31
3.3.1 Assembly Sequence ___________________________ 31
3.3.2 Mount the Return Sensor Ports __________________ 32
3.3.3 Mount the Powerheads _________________________ 33
3.3.4 Assemble the Circuit Hubs ______________________ 33
3.3.5 Install the Control Unit _________________________ 35
Overview of Control Unit Sockets _____________________ 35
Locating the Control Unit ____________________________ 36
Connect the Circuit Hubs to the Control Unit ___________ 37
Attach the Supply Sensor ____________________________ 38
Socket for Future Radiant Cooling Function ____________ 38
Connect the WLAN Module __________________________ 38
External Output ____________________________________ 39
Socket for Future Radiant Cooling Function ____________ 39
3.3.6 Install the Thermostat __________________________ 40
Mounting Versions __________________________________ 41
Using the Mounting Frame ___________________________ 41
Mounting the Thermostat to the Wall __________________ 42
Mounting the Thermostat on a Concealed Socket ______ 42
Unlocking the Mounting Frame _______________________ 43
3.3.7 Optional: Install the Range Extender _____________ 43
3.3.8 WLAN Module ________________________________ 44
4 Hardware Set-Up Procedures ______ 45
4.1 Hardware Operation Method Requirements ____ 45
4.1.1 Method 1 – Zone Control via Power Level _________ 45
4.1.2 Method 2 – Zone Control via Thermostat _________ 45
4.1.3 Component Identi󶈵cation _______________________ 45
4.2 Method 1 – Zone Control via Power Level _____ 45
4.2.1 Setting the Power Level at the Circuit Hub ________ 46
4.3 Method 2 – Zone Control via Thermostat ______ 46
4.3.1 Inserting the Batteries — Commissioning _________ 46
4.3.2 Replace Batteries ______________________________ 47
4.3.3 Establishing a 120 V Connection ________________ 47
4.3.4 Logging the Thermostat into the Control Unit _____ 48
Log-In Process _____________________________________ 49
4.3.5 Checking the Radio Connection _________________ 49
4.3.6 Logging O󶈴 the Thermostat _____________________ 49
4.3.7 Using / Logging into Range Extenders ___________ 50
Logging the Thermostat into the Range Extender _______ 51
Log-In Process _____________________________________ 51
4.4 Checking the Wireless Connection to the

Table of Contents
5 IM-HC 599871 0321 RABS
Thermostat ________________________________ 52
4.4.1 Ranges of Radio Connections ___________________ 52
4.4.2 Checking the Radio Connection Thermostat / Control
Unit __________________________________________ 52
4.4.3 Checking the Radio Connection Radio Ampli󶈵er /
Control Unit ___________________________________ 53
4.4.4 Checking the Radio Connection of the Thermostat /
Radio Ampli󶈵er ________________________________ 53
4.5 Thermostat Operation ______________________ 53
4.5.1 Setting the Room Temperature __________________ 53
4.5.2 Changing the Temperature Units ________________ 54
4.6 Resetting to Factory Settings – Reset _________ 54
4.6.1 Resetting the Thermostat to Factory Settings _____ 55
4.6.2 Resetting the Control Unit to Factory Settings _____ 55
5 Software Set-Up Procedures _______ 56
5.1 Software Operation Method Requirements ____ 56
5.1.1 Method 3 – Local Operation via Software _________ 56
5.1.2 Method 4 – Remote Operation via Software _______ 56
5.2 Method 3 – Local Operation via Software ______ 56
5.2.1 Overview of Functions _________________________ 56
5.2.2 Setting Up a WLAN Module _____________________ 57
5.2.3 Starting the Operating Software _________________ 57
5.2.4 Entering Company Data ________________________ 58
5.2.5 Name the Control Unit _________________________ 58
5.2.6 Name the Rooms ______________________________ 59
5.2.7 Establish a Peer-to-Peer Connection _____________ 59
5.3 Operating States ___________________________ 60
5.3.1 Cooling Mode _________________________________ 60
5.3.2 Operation with Temperature Pro󶈵le ______________ 60
5.3.3 Temperature Reduction Mode ___________________ 61
5.3.4 Fault Indication ________________________________ 61
5.4 Method 4 – Remote Operation via Software ___ 61
5.4.1 Connecting the Control Unit via WLAN ___________ 61
5.4.2 Connecting the Control Unit via LAN _____________ 64
5.4.3 Create an Account _____________________________ 64
5.4.4 Managing Devices _____________________________ 66
5.4.5 Starting the Operating Software _________________ 69
5.4.6 Managing Members ___________________________ 69
5.4.7 Performing Software Updates ___________________ 70

Table of Contents
6 IM-HC 599871 0321 RABS
6 Operation _________________________ 72
6.1 Operating Software _________________________ 72
6.1.1 Start Screen of Operating Software ______________ 72
6.1.2 Menu Overview _______________________________ 73
6.1.3 Rooms / Power Level Menu _____________________ 74
6.1.4 Rooms / Thermostat Menu _____________________ 75
6.1.5 Rooms Menu / Change Heating Pro󶈵le ___________ 75
6.1.6 Copy Rooms / Heating Pro󶈵le Menu _____________ 76
6.1.7 Limit Rooms / Room Temperature Menu __________ 77
6.1.8 Rooms / Additional Settings Menu _______________ 78
6.1.9 Leaving Home Mode Menu _____________________ 79
6.1.10 Operating Mode Menu _________________________ 80
6.1.11 Central Settings / WLAN Menu __________________ 81
6.1.12 Central Settings / Control Units Menu ____________ 82
6.1.13 Control Units / Overview Control Units ___________ 83
6.1.14 Sorting and Renaming Rooms __________________ 84
6.1.15 Activating Circuit O󶈴set ________________________ 85
6.1.16 Control Units / Overview Control Units / WLAN ____ 86
6.1.17 Central Settings / Language Menu _______________ 86
6.1.18 Central Settings / Country-Speci󶈵c Settings Menu _ 87
6.1.19 Central Settings / Limit Supply Temperature Menu _ 88
6.1.20 Central Settings / Analyze Supply Temperature Menu
88
6.1.21 Central Settings / Password Menu _______________ 89
6.1.22 Central Settings / Fault Menu ___________________ 90
6.1.23 Central Settings / Update and Version Menu ______ 90
6.1.24 Central Settings / Imprint and Support Menu ______ 91
6.1.25 Central Settings / System Time Menu ____________ 92
7 Errors / Fault Indications ___________ 93
7.1 Control Unit _______________________________ 93
Thermostat ________________________________________ 94
7.2 Circuit Hub ________________________________ 95

Table of Contents
7 IM-HC 599871 0321 RABS
8 Maintenance and Care _____________ 96
8.1 Maintenance _______________________________ 96
8.1.1 Replace Batteries ______________________________ 96
8.2 Care ______________________________________ 96
8.2.1 Thermostat / Range Extender — Display _________ 96
8.3 Replacing Components ____________________ 96
8.3.1 Replacing the Powerhead ______________________ 96
8.3.2 Replacing the Circuit Hub ______________________ 96
8.3.3 Exchanging the Thermostat _____________________ 97
8.3.4 Replacing the Range Externder _________________ 97
8.3.5 Replace Supply Temperature Sensor _____________ 97
8.3.6 Replacing the Ribbon Cable (Bus) _______________ 97
8.3.7 Replacing the Humidity Sensor __________________ 97
8.3.8 Replacing the Control Unit ______________________ 97
8.3.9 Replacing the WLAN Module____________________ 98
8.4 Disposal _________________________________ 100
9 Limited Warranty _________________ 101
9.1 Limited Warranty for Viega Heating and Cooling
Solutions _________________________________ 101

8
About this Document
IM-HC 599871 0321 RABS
1 About this Document
Refer to www.viega.com/legal for legal information that pertains to this document.
1.1 Disclaimer
NOTICE!
Viega products are designed to be installed by licensed and
trained plumbing, mechanical, and electrical professionals who
are familiar with Viega products and their installation. Installation
by non-professionals may void Viega LLC’s warranty.
This document is subject to updates. For the most current
Viega technical literature please visit www.viega.us.
The 󶈵rmware and software for RABS are subject to updates.
For the most current versions please visit www.rabs.viega.us.
The WLAN Module for RABS enables operation software that
is subject to updates. For the most current software version
please visit www.rabs.viega.us.
1.2 Symbols Used
The following symbols may be used within this document:
DANGER!
This symbol warns of possible life-threatening injury.
WARNING!
This symbol warns of possible serious injury.
CAUTION!
This symbol warns of possible injury.
NOTICE!
This symbol warns of possible damage to property.
Notes give you additional helpful tips.

9 IM-HC 599871 0321 RABS
About this Document
1.3 Audience
The information in this installation manual is directed at the following
groups:
Plumbing and heating professionals and trained personnel
Quali󶈵ed electricians
Operators
End users
Viega products must be installed, set up, and operated in accordance
with Viega documentation.
Give this document to the operator or owner after completing
installation and set-up.
1.4 Safety Notices
DANGER!
Risk of electric shock!
An electric shock can lead to burns, serious injury, and even death.
–Electrical work may only be performed by quali󶈵ed
electricians.
–Shut o󶈴 the power before performing electrical work.
CAUTION!
Risk of explosion if batteries are replaced by an incorrect type.
Dispose of used batteries according to the instructions.
NOTICE!
Any changes/modi󶈵cations to this equipment not approved
by Viega LLC could void the user's authority to operate the
equipment.

10
Product Information
IM-HC 599871 0321 RABS
2 Product Information
2.1 Standards and Regulations
Regulation Category Applicable Regulation or Standard
Safety Requirements USA
UL 60730-1: 2016 Ed 5 Automatic
Electrical Controls - Part 1: General
Requirements
UL 60730-2-9: 2017 Ed 4 Particular
Requirements for Temperature
Sensing Controls
DIN EN 60730-2-14: 2009 Particular
Requirements for Electrical Actuators
FCC Part 15 Subpart B
FCC Part 15 Subpart C
IEC 60950-1
Canada
CAN/CSA E60730-1: 2015 Ed 5
CAN/CSA E60730-2-9: 2018 Ed 4
CAN/CSA E60730-2-14: 2013
ICES 003 Issue 6 (Jan 2016)
RSS 247 Issue 2 (Feb 2017)
RSS-Gen Issue 5 (March 2019)
E󶈷ciency standards for
external power supplies
USA: DoE Level VI
Canada: NRCan Tier 1
Wireless Communication FCC Part 15 Subpart B
FCC Part 15 Subpart C
NOTICE!
Limits for Class B digital device
NOTICE!
This device complies with Part 15 of the FCC rules

11 IM-HC 599871 0321 RABS
Product Information
NOTICE!
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment o󶈴
and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
–Increase the separation between the equipment and receiver.
–Connect the equipment into an outlet on a circuit di󶈴erent
from that to which the receiver is connected.
–Consult the dealer or an experienced radio/TV technician for help
NOTICE!
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.
2.2 Intended Use
NOTICE!
All RABS components were designed to be plug and play by
using non-interchangeable connections.
However, the end user is responsible for acquiring two
conductor 18 AWG cable for connecting RABS to a heat
source. The total length of this cable must not exceed 32 feet.
The Radiant Auto-Balancing System (RABS) is an energy e󶈷cient digital
zone controller for residential radiant heating systems. It o󶈴ers four
progressively e󶈷cient operation methods (from local push-button to remote
operation via end device) that can heat zones up to a set point of 86° F.

12
Product Information
IM-HC 599871 0321 RABS
2.3 Product Description
2.3.1 Functions and Features
RABS achieves the desired temperature in each zone by analyzing the
supply water temperature, each circuit's return temperature, and zone air
temperatures where a thermostat is used.
RABS bene󶈵ts:
Constant analysis enables automatic hydraulic balancing. Manual
hydraulic calibration is not required.
It can compensate for inconsistencies and imperfections like:
– Di󶈴erent circuit lengths or tube sizes
– Varying installation clearances or tube depths
– Floor coverings, rugs, furniture, etc.
– Fluctuating supply temperatures, outdoor temperatures, external
heat sources
Operation Methods
The Radiant Auto-Balancing System (RABS) gives users the ability to
independently control each zone in a radiant heating system. RABS
o󶈴ers four di󶈴erent operation methods that complement each other. The
user can control zones through power levels, thermostats, and operation
software. A local end device can access the operation software by
connecting to the WLAN module via wireless communication or an RJ45
cable. The same operation software can be accessed remotely via the
internet if the WLAN module is connected to a password protected
WLAN network.
Method 1: Zone Control via Power Level
The control unit regulates zone temperatures using a temperature
di󶈴erential that is set by a power level.
Method 2: Zone Control via Thermostat
Target zone temperatures can be set on a wireless thermostat that
measures the actual zone temperature.
Method 3: Local Operation via Software
A local connection to the WLAN module gives the end user access and
control over all RABS settings.
Method
4: Remote Operation via Software
The end user can access and control all RABS settings remotely via a
password protected Internet website.
See Ä 2.6 “Operation Methods” on page 26.

13 IM-HC 599871 0321 RABS
Product Information
Features
Easy to set-up: no manual hydraulic balancing required.
Energy e󶈷ciency opportunities with every operation method.
Each WLAN module associated with a control unit is password-
protected.
User friendly hardware and software user interfaces.
Full access to custom RABS settings via software.
Each zone pro󶈵le in the operation software can change the target
temperature up to six times per 24 hour period.
Convenience functions:
– Individual zones can be prioritized.
– Custom temperature limits can be set for each thermostat.
– Unoccupied Mode increases energy e󶈷ciency by reducing
demand during unoccupied periods.
– Dynamic long-term temperature analysis helps optimize the
system settings for increased e󶈷ciency.
– RABS prevents the 󶈶oor from cooling down when the room is
heated by an external source like a 󶈵replace, solar gain, etc.
– Fault diagnosis system.
2.3.2 Component Overview and Description
The desired operation method determines which components are
required. See Ä 2.6 “Operation Methods” on page 26.
Component Overview
AKTOR
VL-TEMP
TAUP.
RS-232
RESET
1
2
3
4
5
6
B
7A
Figure 1: Component overview
1 - Thermostat (white)
2 - Thermostat (black)
3 - Control unit
4 - WLAN module
5 - Powerhead
6 - Circuit hub
7 - Supply sensor
A - Return manifold
B - Supply manifold

14
Product Information
IM-HC 599871 0321 RABS
Control Unit
Model 1250US
Functions of the control unit:
Data and analysis hub for all components involved in the system.
Achieves zone target temperatures by constantly monitoring and
analyzing the supply manifold water temperature, each circuit's return
water temperature, and zone air temperatures when a thermostat is used.
Controls the powerheads.
Communicates with thermostats and range extenders at 916 MHz.
Communication hub for Wi-Fi enabled and/or Internet based end devices.
Subcomponents
AKTOR
VL-TEMP
TAUP.
RS-232
RESET

 


Figure 2: Control unit
1 - Integrated power adapter
2 - Socket for long ribbon cable (31.5 inches)
3 - Male connector for supply sensor
4 - Socket for future function
5 - Male connector for WLAN module
6 - Cable clip: external output (dry contact)
7 - Socket for future function
8 - 916 MHz Transceiver
9 - Button cell (CR2032)
10 - Reset button
11 - Housing lock
12 - “OK” button
13 - “Connect” Button
14 - “Connect” LED
15 - “Status” LED
16 - Housing faceplate
Additional items included with the control unit:
Supply sensor:
– Thermistor (10 kΩ)
– Housing for thermistor
– Heat conduction pad
– Zip-tie
Long ribbon cable (31.5 inch) for connecting to the circuit hubs
Mounting hardware: 3 dry wall anchors, 3 screws, and 3 bushings
For installation instructions, see Ä 3.3.5 “Install the Control Unit” on page 35.

15 IM-HC 599871 0321 RABS
Product Information
Powerhead
Model 1250.1US
The powerhead controls the 󶈶ow through the circuit on which it is
mounted. The control unit regulates each powerhead through the series
of ribbon cables connected to the series of circuit hubs.
Subcomponents
1
2
3
4
Figure 3: Powerhead
1 - Valve on (up) / o󶈴 (down and 󶈶ush) indicator
2 - Housing
3 - Plug for circuit hub
4 - Threaded connection to the return valve on the return manifold
For mounting instructions, see Ä 3.3.3 “Mount the Powerheads” on
page 33.
Return Sensor Port
Model 1250.2US
The return sensor port connects to the return manifold and houses the
return temperature sensor on the circuit hub.
Subcomponents
1
2
3
Figure 4: Return sensor port
1 - SVC connection to the return manifold
2 - Port for the return temperature sensor on the circuit hub
3 - SVC connection to tubing (for connection to Viega stainless
manifolds)
For mounting instructions, see Ä 3.3.2 “Mount the Return Sensor Ports”
on page 32.

16
Product Information
IM-HC 599871 0321 RABS
Circuit Hub
Model 1250.3US
The circuit hub is a communication center between the return
temperature sensor, the control unit, and the circuit's powerhead. Each
circuit hub has an integrated return temperature sensor. The return
temperature sensor on the circuit hub goes into the return sensor port.
The circuit hub transmits the return temperature to the control unit. The
control unit uses this information to determine how to prioritize and/or
distribute heat to each circuit in the system. After the control unit
analyses the system parameters, it transmits control information back to
each circuit's powerhead.
Subcomponents
1
2
3
Figure 5: Circuit hub front and short ribbon cable
1 - LED
2 - Power level button
3 - Short ribbon cable (3 inch) for next circuit hub
1
2
3
Figure 6: Circuit hub rear
1 - Socket for next circuit hub
2 - Socket for powerhead
3 - Socket for long ribbon cable (31.5 inch) or previous circuit hub
For assembly instructions, see Ä 3.3.4 “Assemble the Circuit Hubs” on
page 33.

17 IM-HC 599871 0321 RABS
Product Information
Thermostat
Model 1250.5US
Black faceplate, part no. 17060
White faceplate, part no. 17065
The thermostats communicate with the control unit at 916 MHz. They
measure and display the zone temperature, and are used to set a target
temperature.
Subcomponents
1
2
3
4
5
Figure 7: Thermostat subcomponents
1 - Metal plate
2 - Mounting frame
3 - Housing and display faceplate
4 - Two alkaline AA batteries
5 - Screws and drywall anchors (3/16 inch)
A123C45E
1
2
1
3
4
5
Figure 8: Thermostat rear housing
1 - Two alkaline AA battery compartments
2 - Socket for optional power adapter
3 - Optional power adapter cable guide
4 - Mounting frame latch
5 - Thermostat serial number
For installation instructions, see Ä 3.3.6 “Install the Thermostat” on
page 40.

18
Product Information
IM-HC 599871 0321 RABS
1
2
3
4
5
6
7
Figure 9: Thermostat display
1 - Housing
2 - “+” Button
3 - “-” Button
4 - Digital display
5 - “Set” LED
6 - “Connect” LED
7 - Faceplate
For the thermostat set-up procedure, see Ä 4.3 “Method 2 – Zone
Control via Thermostat” on page 46.
WLAN Module
Model 1250.4US
The WLAN module connects the control unit to end devices. It connects
to the control unit with a cable.
Subcomponents



Figure 10: WLAN module
1 - Wi-Fi transceiver
2 - LAN port (RJ 45)
3 - Plug for the control unit
For connection instructions, see Ä3.3.8 “WLAN Module” on page 44.

19 IM-HC 599871 0321 RABS
Product Information
2.3.3 Accessories
RABS accessories can increase the capability, versatility, and performance of
your radiant system. See Ä 5.2.2 “Setting Up a WLAN Module” on page 57 to
ensure the essential requirements have been met before exploring accessories.
Range Extender
Model 1250.6US
Black housing, part no. 17075
White housing, part no. 17080
Thermostats and range extenders communicate with the control unit at 916
MHz. Use a range extender when the signal from a thermostat to the control
unit is too weak. Range extenders require the RABS power adapter to
operate. Range extenders operate in parallel, not in series. Each control unit
can connect with two range extenders maximum.
Subcomponents
1
2
3
4
Figure 11: Range Extender
1 - Metal plate
2 - Mounting frame
3 - Housing and display faceplate
4 - Screws and drywall anchors (3/16 inch)
1
2
3
Figure 12: Range Extender rear housing
1 - Socket for power adapter
2 - Mounting frame latch
3 - Power adapter cable guide
For information on how to incorporate this accessory, see Ä 3.3.7
“Optional: Install the Range Extender” on page 43.

20
Product Information
IM-HC 599871 0321 RABS
Power Adapter for Range Extenders and/or Thermostats
Model 1250.7US
This power adapter provides power to range extenders and/or
thermostats. The power adapter plugs into standard wall sockets and
converts 120V AC to 7.5V DC. Power adapters are required for range
extenders. They are optional for thermostats.
The cable is 39 inches long.
Figure 13: Power adapter for range extenders and/or thermostats
See Ä “Mounting the Thermostat to the Wall” on page 42 for
recommended clearance dimensions before selecting this accessory.