Armstrong The Brain DRV25 User manual

1
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
The installation and service must be performed by a qualied installer.
For further information, please call our technical department Toll Free at 1-888-468-4673.
The Brain®
DRV25
Digital Recirculation Valve
Keep this manual with installation
for future reference.
Recirculating Valve
E357437

2
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Contents
Introduction ............................................................ 3
Safety ...................................................................... 3
General Advisory ................................................... 4
Data Storage ...................................................... 4
Patents ............................................................... 4
Standards and Codes ....................................... 5
Single DRV25 Pack Contents ............................... 6
DRV25 Dimensions ................................................ 7
Specications ........................................................ 8
Technical Specications ................................... 8
Default Settings ................................................. 9
Installation ............................................................ 10
General ............................................................. 10
Installation Requirements .............................. 11
Piping Diagrams .............................................. 12
Installation - DRV25 ............................................. 15
Commissioning .................................................... 16
Mobile App ........................................................... 18
Connect to DRV25 ........................................... 18
Dashboard ........................................................ 19
Congure Setpoint .......................................... 20
Options ............................................................. 21
Prole Settings ................................................ 22
Devices ............................................................. 23
Thermal Disinfection ....................................... 24
Disinfection Quick Start Guide - 1 ............. 28
Disinfection Quick Start Guide - 2 ............. 29
Connectivity ......................................................... 30
System Performance ........................................... 30
Preventative Maintenance and Fitting
Spare Parts........................................................... 31
DRV25 Spare Parts .......................................... 32
Disassembly of the PCBA from the
Front Cover ...................................................... 34
PCB Connections ............................................ 35
DRV25 Digital Recirculation Mixing
Valve
Drive Mechanism Assembly ........................... 36
Drive Assembly ................................................ 39
Troubleshooting .................................................. 40
Contents ........................................................... 40
DRV25 LED Indications ................................... 41
DRV25 Errors ................................................... 42
Common Faults ............................................... 46
Limited Warranty and Remedy ........................... 52

3
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Introduction
Safety
The Brain®DRV25 is a registered trademark of Armstrong Hot Water Group, a division of Armstrong International.
DRV25 features Rada Technology, Rada is a registered trademark of Kohler Mira Limited of Cheltenham, England.
The DRV25 is a digital recirculating valve for use as part of a warm water recirculation system within a commercial
installation.
A dedicated accompanying mobile app can monitor and control temperature limits, disinfection cycle and view
error logs. This product can be linked to external control and monitoring devices such as a Building Management
System. Data connections can be made via the dedicated BMS port.
Download the “SAGE®byArmstrong” mobile app from either theApple
App Store or Google Play or scan the QR code.
• Applicable codes must be followed and supersede any other instructions.
Generally applicable codes in the US include:
• IPC (International Plumbing Code)
• Read this manual
• Improper installation or operation may cause a ood resulting in property
damage, personal injury, or death. Armstrong strongly recommends that
a qualied installer be used.
• Service must be performed by a qualied person.
• Improper installation, start-up, operation, maintenance, or service may
void the warranty.
Hot water or metal may cause scald burns. Skin exposure to 140°F water
or metal for only ve seconds may cause a second degree burn.
Icon Legend
If instructions are not followed:
- Injury or death and property damage are imminent
- Blessures ou décès et dégâts matériels imminents
- Injury or death and property damage are possible
- Blessures ou décès et dégâts matériels possibles
- Potential property damage, expensive repairs, and / or voiding the warranty may result
- Des dégâts matériels potentiels, des réparations onéreuses, et / ou une annulation de la
garantie peuvent survenir

4
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Patents
The use of the word ‘failsafe’ to describe the function of any hot and cold water mixing valve is both incorrect and
misleading. This DRV (Digital Recirculation Valve) incorporates additional shut-o󰀨 devices to improve the level of
safety however, in keeping with every other mechanism it cannot be considered as being functionally infallible.
Where chloramine / chlorine disinfection is practiced, DO NOT exceed a chloramine / chlorine concentration of
50 mg/l (ppm) in water, per one hour dwell time. Such procedures must be conducted strictly in accordance with
the information supplied with the disinfectant and with all relevant Guidelines / Approved Codes of Practice.
Water must have levels of chloramine / chlorine lower than or equal to 4mg/l (ppm) for continual usage.
General Advisory
GB - 2 421 297 2 437 891
US - 7669776 8043556
PCT - PCT/GB2006/000159
European - 06702758.1
India - 1231/MUMNP/2007
Australia - 2006207367
Canada - 2595064
China - ZL200680005853.8
Japan - 4933451
Data Storage
Armstrong International shall not accept liability in contract, tort (including negligence or otherwise) for any loss of
prots, business or anticipated savings, or loss or corruption of data, or any indirect or consequential loss arising
out of the customer's use of DRV25. The customer shall be solely responsible for the independent backup of all
data / information stored on DRV25. Notwithstanding the foregoing, none of the exclusions and limitations stated
above are intended to limit any rights the customer may have under local law or other statutory rights which may
not be excluded.

5
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Standards and Codes
FCC Compliance Notice
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
• This device may not cause harmful interference.
• This device must accept any interference received, including interference that may cause undesired
operation.
Note! 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:
• Reorient or relocate the receiving antenna.
• 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
Any modications made to this device that are not approved by Rada may void the authority granted to the user
by the FCC to operate this equipment.
Industry Canada
CAN ICES-3 (B) / NMB-3(B)
The Bluetooth®word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of
such marks by Kohler Mira Ltd is under license. Other trademarks and trade names are those of their respective
owners.
La marque et les logos Bluetooth®sont des marques déposées de Bluetooth SIG, Inc. et Kohler Mira Ltd les utilise
sous licence. Les autres marques déposées et noms commerciaux appartiennent à leurs propriétaires respectifs.

6
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Single DRV25 Pack Contents
4 x Duracell High Power Lithium CR2 (3V) Batteries
1 x DRV
Digital Recirculation Valve

7
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
DRV25 Dimensions
6-5/6″
(160 mm)
1-5/8″
(42 mm)
5-3/16″
(132 mm)
9-1/16″
(230 mm)
6′
(1.8 m approx)
power cable
length

8
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Technical Specications
Specications
General
Protection NEMA 3S
Ambient Temperature Minimum ambient temperature of 35 °F (2 °C) maximum 122 °F (50 °C)
Ambient Humidity 95% Non-condensing
Connections 1” NPT Internal (female)
Installation Environment Suitable for indoor use only
Normal Environmental Conditions Altitude up to 2000m
IP Rating IPx4
Materials Electronics Casing: PC/ABS
Valve: Stainless Steel, engineering plastics and elastomers
Safety Thermal shutdown upon inlet supply failure and / or power failure
Weight 6.83 lbs (3.1 kg)
Pressures
Maximum Inlet Supply Pressure 200psi (1379 kPa = 13.8 bar)
Minimum Inlet Supply Pressure 20 psi (138 kPa = 1.5 bar)
Supply Pressure Di󰀨erential Inlet supply pressures must be nominally equal
Temperatures
Maximum Inlet Hot Water Supply 185°F (85°C), 131°F (55°C) During group control
Minimum Inlet Hot Water Supply 2°F (1°C) above set point
Minimum Inlet Cold Water 35.6°F (2°C)
Set Point Range 78.8°F to 185°F (26 - 85°C)
Minimum Recirculation Loop
Temperature Loss 2°F (1°C)
Recirculation Circuit
Minimum distance to First Outlet 25 ft (7.6 m)
Flow Rates
Maximum Suggested Flow Rate 45 gpm (170 lpm)
Minimum Recirculation Flow Rate 2 gpm (8 lpm)
Minimum System Draw-o󰀨 0 gpm (0 lpm) during recirculation, 2 gpm (8 lpm) during group control
Electrical
Power Supply 120 - 240V AC ~ 50/60Hz
Supply Fuse / Circuit Breaker Grounding is required.
Switched type 3 Amp (no plug), 15 Amp Grounding-type receptacle (plug).
Battery 4 x Duracell High Power Lithium CR2 (3V)
Duty Cycle Continuously rated
Overvoltage Category II
Classication Pollution Degree 2

9
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Default Settings
DRV25 is preprogrammed to customer requirements prior to shipment
The settings are derived from the Installation Detail Form (IDF) lled out by the customer when placing an order.
The Installation Detail Form (IDF) is available to download at www.armstronginternational.com/brain
or consult factory
Reference Drawing Number: ________________________
Armstrong Model Number: _________________________
Section 3 – DRV Setpoint Programming Detail
The Brain® Mixed Water Outlet Temp Setpoint: ________ °F
SAGE®(BS) No: Yes:
If Yes - Select ProtoCessor, or SAGE® for the Web
SAGE® for BAS Interface Protocol Options
BACnet™ IP
BACnet™ Metasys N2
BACnet™ MSTP
LonWorks™
Modbus RTU
Modbus TCP
SAGE® for the Web
Complete SAGE® IDF (Fee-Based Subscription Options)
Armstrong International – Hot Water Group
221 Armstrong Blvd., Three Rivers, Michigan 49093 - U.S.A. Phone: [phone] • Fax: [phone]
armstronginternational.com
© 2019 Armstrong International, Inc.
Digital Recirculating Valve (DRV) • Digital Mixing Center (DMC) • SAGE® (BS)
In order to enter P.O.’s and guarantee delivery dates, a technically accurate and complete IDF is required.
The review and acceptance of the information on the IDF by Armstrong:
1.Approves the order for processing which triggers an e-mail confirmation
2.Indicates that AHWG supports you by endorsing the application
3.Initiates the warranty
4.Delivers a complete, AHWG supported performance guarantee to the final user of the product
5.Drives the relevant point of specification/influence, point of installation and point of order financial allocation if appropriate
Minimum Recirc: Each DRV25 requires 2 gpm.
Each DRV40 requires 5 gpm. Each DRV50 or
DRV80 requires 10 gpm
List Any Non-Standard Options or Details Here:
Inlet Hot Water Temp to DRV: ________ °F
Inlet Hot Water Pressure to DRV: ________ PSI
Inlet Cold Water Temp to DRV: ________ °F
Inlet Cold Water Pressure to DRV: ________ PSI
Maximum System Demand: ________ GPM
Continuous Recirc to DRV: ________ GPM
DRV25 for Group Control:
Section 1 - Ordering Processing/Tracking Detail:
Point of Order / Sold To: _____________________________________________________________ (eg: ABC Mechanical)
City: __________________________ State: _____ Rep Firm: ______________________________
Point of Installation: ________________________________________________________________ (eg: Heinz Ketchup)
City: __________________________ State: _____ Rep Firm: ______________________________
Point of Specification: ______________________________________________________ (eg: DEF Consulting Engineers)
City: __________________________ State: _____ Rep Firm: ______________________________
Other Influence: ___________________________________________________________ (eg: Source of Recommendation)
Installation Details Form (IDF)
Section 2 – DRV & Installation Site Details
Size: DRV25 DRV40 DRV50 DRV80

10
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
General
Installation must be carried out in accordance with these instructions, and must be conducted by designated,
qualied and competent personnel.
L’installation doit être réalisée conformément à ces instructions, et doit être e󰀨ectuée par un personnel
qualié désigné.
The installation must comply with all relevant local and state water plumbing codes.
The DRV25 must be installed as per the piping diagrams (pages 12, 13 & 14). All plumbing components are to be
Installation
Caution! The DRV25 must be installed in a dry area where it will not be able to freeze
(minimum ambient temperature of 35 °F (2 °C)).
Attention! L’installation du DRV25 doit se faire dans un endroit sec où il ne pourra pas geler (à
une température ambiante minimale de 35°F (2°C)).
supplied by the installer. Failure to include these components will compromise the product, system performance
and will void the warranty.
Notes:
1. DRV25 is supplied fully performance and pressure tested.
2. The DRV25 must be installed in an area where it is accessible to do any maintenance tasks e.g. removal of
the cover, replacing worn parts etc.
3. Suitable connections for ease of maintenance should be used on the inlet and outlet ports. (Isolation valves
and unions.)
4. The hot and cold water inlet supply pressures must be nominally equal.
5. The cold inlet supply feed to the DRV25 must be “tapped” directly from the cold inlet supply to the water heater.
6. The inlet supply pipework must be thoroughly ushed before tting the DRV25.
The Brain®DRV25 MUST ONLY
be installed in this orientation.
These clearance dimensions are
recommended for maintenance
purposes.
The Brain® DRV25 NE DOIT
être installée que dans ces
conditions.
Ces dimensions de l’espace
sont recommandées pour des
besoins de maintenance.
4″ 6″4″
2″
8″
2-5/8″
(100 mm)
Min

11
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Installation Requirements
Inlet isolating valves (full ow type) must be installed close to the DRV25 for ease of maintenance.
It is recommended that outlet isolating valves (full ow type) are also installed.
The use of supply / return strainers will reduce debris entering the DRV25. The recommended
gauge for such strainers is 40 mesh (mesh aperture dimension = 0.424mm).
Inlet pressure tappings which allow measurement of the inlet pressures to the DRV25 under
operating conditions are particularly recommended for in-service testing.
Pipework must be rigidly supported to avoid any strain on the connections.
Make sure the pipe layout will avoid the build up of trapped air in the system. Air release valves
can be used where this is not possible.
Inlet and outlet threaded joint connections should be made with PTFE thread sealing tape or liquid
sealant. Do not use oil-based, non-setting joint compounds.
To eliminate pipe debris it is essential that supply pipes are thoroughly ushed before connection
to the DRV25.
1
2
3
4
5
6
7

12
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Sink
Shower
Thermometer
Strainer
Cold Water
Hot Water
Mixed Water
Check Valve
Recirculation Pump
From Hot
Water Supply
Return to
Hot Water
Supply Inlet
Mixed Flow
Items are installer
supplied
Mixed Flow
Outlet
Outlet
DRV
HC
Cold Water
Supply
System Layout
- Legend -
Isolation Valve
DRV25 Assembly
Swing Check Valve*
- Legend -
Thermometer
Isolation Valve
*Orientated for piping
schematic detail only.
Must be installed in
horizontal plane.
®
THE BRAIN
DRV25
Figure 12-1. DRV25 Single Valve Installation
Note: DRV25 inlet connections are 1″.
Bon à savoir: La tubulure d’entrée du DRV25 est 1”.
Piping Diagrams

13
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
C
HCH
From Hot
Water Supply
Return to
Hot Water
Supply Inlet
Cold Water
Supply
DRV DRV
Mixed Flow
Mixed Flow
Outlet
Outlet
®
THE BRAIN
DRV25
®
THE BRAIN
DRV25
Sink
Shower
Thermometer
Strainer
Cold Water
Hot Water
Mixed Water
Check Valve
Recirculation Pump
Items are installer
supplied
System Layout
- Legend -
Isolation Valve
DRV25 Assembly
Swing Check Valve*
- Legend -
Thermometer
Isolation Valve
*Orientated for piping
schematic detail only.
Must be installed in
horizontal plane.
Figure 13-1. DRV25 Dual Valve Installation
Note: DRV25 inlet connections are 1″.
Bon à savoir: La tubulure d’entrée du DRV25 est 1”.

14
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
C
HCH
From Hot
Water Supply
Return to
Hot Water
Supply Inlet
Cold Water
Supply
DRV DRV
Mixed Flow
Mixed Flow
Outlet
Outlet
®
THE BRAIN
DRV25
®
THE BRAIN
DRV25
Sink
Shower
Thermometer
Strainer
Cold Water
Hot Water
Mixed Water
Check Valve
Recirculation Pump
Items are installer
supplied
System Layout
- Legend -
Isolation Valve
DRV25 Assembly
Swing Check Valve*
- Legend -
Thermometer
Isolation Valve
*Orientated for piping
schematic detail only.
Must be installed in
horizontal plane.
HC
105°F (40.5°C)
105°F (40.5°C)
126°F (52°C)
Mixed Flow
Outlets
Outlets
Mixed Return
From Hot Water Supply
Return to Hot Water Supply Inlet
Cold Water Supply
Typical School Locker Room Shower
Cold Water Supply
®
THE BRAIN
DRV25
®
THE BRAIN
DRV25
®
THE BRAIN
DRV80
Figure 14-1. DRV25 Group Shower Installation
Note: DRV25 inlet connections are 1″.
DRV80 inlet connections are 1.5″.
Bon à savoir: La tubulure d’entrée du DRV25 est 1”
La tubulure d’entrée du DRV80 est 1,5”.

15
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Installation - DRV25
Before tting to the pipework, it is recommended
that connectors are tted to the inlets and outlet.
This will enable the DRV to be easily removed,
if required.
Flush pipework thoroughly
(minimum of 5 minutes).
Fit the DRV to the pipework.
Grounding is required, connect the power
cable to the primary power supply via switched
circuit breaker with a 3 Amp fuse or a 15 Amp
grounding-type receptacle (socket).
Do not t or replace a power cable plug!
Ensure the LED on the DRV goes through the
initial power up sequence.
Commission the DRV25 and recirculation
system using the following instructions...
1
2
3
4
5
6
®
THE BRAIN
DRV25
®
THE BRAIN
DRV25
®
THE BRAIN
DRV25

16
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Ensure the system is powered o󰀨 and the power
cable is unplugged from the primary power
supply.
Flood the system in the following sequence:
• Open the cold water supply isolation
valve(s).
• Open the outlet ow isolation valve(s).
• Open the hot water supply isolation valve(s).
• Once ooded, connect the power cable to
the primary power supply via switched circuit
breaker with a 3 Amp fuse or a 15 Amp
grounding-type receptacle (socket).
Ensure that the DRV25 is powered and the LED
on the front cover is illuminated.
The LED indicator initially ashes red, green
and blue upon power up then changes to green
once operational.
Make sure the hot and cold inlet supplies are at
their designated pressures and temperatures.
Close all the mixed water outlets and turn on the
circulating pump.
Open SAGE®mobile app on your mobile device
and tap on the ‘Connect to Device’ to pair with
the DRV25.
Note! Ensure Bluetooth is enabled on your
device.
Note! The “SAGE®by Armstrong” mobile app is
available free to download from the Apple App
Store and Google Play Store.
1
2
3
Commissioning
Commissioning must be carried out in accordance with these instructions by designated, qualied and competent
personnel.
4
5
6
7

17
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Tap on the ‘Pair New Device’ to search available
devices using Bluetooth.
Select ‘Armstrong DRV25’ on the screen.
Make sure your mobile device is within Bluetooth
range and the DRV25 and Bluetooth is enabled.
Press and hold the SAGE® Owl logo located at
the bottom of the front cover until you see the
blue light ash. Then tap ‘Proceed’. At the next
screen tap the corresponding DRV25 you wish
to pair to.
Once paired, tap on the ‘Setpoints’ icon to
change the default setpoint if required. The
setpoint was preprogrammed at the factory
according to the installation details specied on
the Installation Detail Form (IDF).
Amend the other default settings as required and
tap on ‘Save’ to update new settings.
Upon connection to the mobile app, the internal
real time clock will be re-synchronised to the
mobile device and will also occur upon each
re-connection. Periodically connect to the
DRV25 to re-synchronise the date and time,
especially post-daylight savings dates for your
installation location.
8
9
10
11
12
13

18
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Mobile App
Make sure your mobile device is within Bluetooth range and that Bluetooth is enabled.
Identify the DRV25 on the SAGE®mobile app to connect to and tap the corresponding product.
Connect to the DRV25

19
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Once connected to the mobile device, the control screens
can be selected individually by tapping on each of the tabs
at the bottom of the screen.
The general status of the DRV25 is displayed by default
upon connection.
The mixed water (outlet) temperature as well as
the hot water supply inlet and system return inlet
temperatures are displayed and refreshed every few
seconds. The DRV25 setpoint is also displayed for
reference.
Dashboard

20
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
armstronginternational.com/brain
Congure Setpoints
Adjust the Default Blend Temperature Setpoint
by tapping on the Up or Down arrow to congure
the desired outlet temperature of the DRV25.
Adjust the Error Temperature setting as required.
This temperature setting will be the point at which
the DRV25 alarms and reverts to recirculation
mode due to an over temperature condition.
Tap on the Save button to transfer the new settings
to the DRV25.
1
2
3