The Armstrong Digital-Flo® Boiler Water/Water Plate and Frame Heat Exchanger is a complete pre-piped instantaneous boiler water/water heater. The package includes a properly sized single or double wall plate and frame heat exchanger packaged with a Digital Recirculating Valve (DRV) and BrainScan® (SAGE®) hot water monitoring control module. Digital technology provides enhanced water temperature control accuracy and enhanced user safety in a single control component.

Armstrong Digital Technology & Connectivity

BrainScan® (SAGE®) is a control module from Armstrong which enables an interface with Building Automation Systems (BAS) which utilize Modbus, BACnet™, or LonWorks™ protocols via the use of specific protocessor cards. It also has an ethernet port and operates as a web server for remote network access.

• Powered by low voltage electronics
• Quick response times eliminate the need for primary side controls
• Programmable high/low temperature alert function
• Programmable hot water system safety shutdown
• Self Diagnostic Display Messaging
• Integral Building Automation System (BAS) Modbus Interface
• Serial Connection Point for BAS Interface (BACnet™, LonWorks™, Web)
• Simplified system commissioning

Heat Exchange Technology

• Lead Free
• Instantaneous - No Storage
• Small footprint – Compact assembly
• Simplified onsite piping - five connections
• Single wall and double wall 316L stainless steel plates
• Plate and frame PHE design with Nitrile gasket (FDA approved) design facilitates field service

Recirculating Valve (DRV40 & DRV80)

• 316L body construction - Lead Free
• Hot water shutoff upon power failure
• Output display: Set point, Operating temperature, Over/under temperature alert
• LCD display and Error message display (Over temperature error, PCB error, Thermister error, Motor error/emergency mode, Battery error)
• SPCO relay contacts: Integral relay for auxiliary device (alarm, solenoid)
• ASSE 1017, CSA B125, CE, UL compliant
• Battery back-up for emergency shutdown and programmed settings retention upon power failure
• +/-2°F (1°C) water temperature control
• RS485 port: Integral Modbus RTU Protocol, Serial port to connect BrainScan®
• DB9 Programming port for valve programming

Operational Specifications

• +/-2°F water temperature control at points of use 25’ downstream during demand
• +/-2°F water temperature control during zero system demand “idling” periods
• 2°F minimum valve inlet to outlet temperature requirement (system recirculation temperature loss)
• Automatic shutoff of hot water flow upon cold water inlet supply failure
• Automatic shutoff of hot water flow in the event of a power failure
• Programmable set point range of 81-158°F (27-70°C)
• Programmable thermal disinfection mode
• Programmable 1st level hi/lo temp alarm display
• Programmable temperature error level for double safety shutdown

Technical Specifications

• Maximum domestic pressure: 150 PSI
• Maximum boiler pressure: 150 PSI
• Complete package Lead Free Compliant
• All domestic side valve fittings and isolation valves, strainers, Inlet/return check valves, inlet, system blend and return thermometers, pre-piped. Boiler side piping/fittings supplied by others.
• DRV – all wetted parts 316 stainless steel, UL Listed
• Stainless steel liners on plate and frame exchanger
• Plates shall be single or double wall field replaceable 316 stainless steel
• Water pipe of type L copper
• Fabricated carbon steel frame with machine grade enamel paint
• 120 volt power supply required
• Secondary (double) safety shut-off valve included

Model Capacities

Single Wall, Boiler Water Greater Than 160°F Models

Model	Domestic Flow (GPM)	Domestic Connections (In/Out)	Recirc. Return	DRV Size	Boiler Flow (GPM)	Boiler Connections
DF15W40BS	15	1” NPT	1” NPT	1.5” NPT	51	1.25” NPT
DF35W40BS	35	1.5” NPT	1” NPT	1.5” NPT	119	2” NPT
DF65W50BS	65	2” NPT	1.5” NPT	3” NPT	221	2” NPT
DF90W80BS	90	3” FLG	2” NPT	3” NPT	306	4” FLG
DF120W80BS	120	3” FLG	2” NPT	3” NPT	407	4” FLG

Single Wall, Boiler Water Less Than 160°F Models

Model	Domestic Flow (GPM)	Domestic Connections (In/Out)	Recirc. Return	DRV Size	Boiler Flow (GPM)	Boiler Connections
DF15WE40BS	15	1” NPT	1” NPT	1.5” NPT	44	1.25” NPT
DF35WE40BS	35	1.5” NPT	1” NPT	1.5” NPT	101	2” NPT
DF65WE50BS	65	2” NPT	1.5” NPT	3” NPT	188	2.5” FLG
DF90WE80BS	90	3” FLG	2” NPT	3” NPT	260	3” FLG
DF120WE80BS	120	3” FLG	2” NPT	3” NPT	347	4” FLG

Double Wall, Boiler Water Greater Than 160°F Models

Model	Domestic Flow (GPM)	Domestic Connections (In/Out)	Recirc. Return	DRV Size	Boiler Flow (GPM)	Boiler Connections
DF15WDW40BS	15	1” NPT	1” NPT	1.5” NPT	51	1.25” NPT
DF35WDW40BS	35	1.5” NPT	1” NPT	1.5” NPT	119	2” NPT
DF65WDW50BS	65	2” NPT	1.5” NPT	3” NPT	221	2” NPT
DF90WDW80BS	90	3” FLG	2” NPT	3” NPT	306	4” FLG
DF120WDW80BS	120	3” FLG	2” NPT	3” NPT	407	4” FLG

Double Wall, Boiler Water Less Than 160°F Models

Model	Domestic Flow (GPM)	Domestic Connections (In/Out)	Recirc. Return	DRV Size	Boiler Flow (GPM)	Boiler Connections
DF15WEDW40BS	15	1” NPT	1” NPT	1.5” NPT	44	2” NPT
DF35WEDW40BS	35	1.5” NPT	1” NPT	1.5” NPT	101	2” NPT
DF65WEDW50BS	65	2” NPT	1.5” NPT	3” NPT	188	4” FLG
DF90WEDW80BS	90	3” FLG	2” NPT	3” NPT	260	4” FLG
DF120WEDW80BS	120	3” FLG	2” NPT	3” NPT	347	4” FLG