Hot Water Generation – Steam/Water Single Wall
Digital-Flo® Steam/Water Shell and Tube Heat Exchanger
Model DF66550BS
DF66550BS is a complete pre-piped single wall instantaneous
steam/water shell and tube heater. The assembly includes
a properly sized shell and tube heat exchanger with a Digital
Recirculating Valve (DRV50) and BrainScan® hot water monitoring
control module.
Digital technology provides enhanced water temperature control
accuracy and enhanced user safety in a single control component.
BrainScan® technology to remotely view and adjust set point, data
log and monitor inlet hot, inlet cold/return and mixed water outlet
with multiple BAS interface options.
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
• Automatic shutoff of hot water flow in the event of a power
• Programmable set point range of 81-158°F (27-70°C)
• Programmable 1st level hi/lo temp alarm display
• Programmable temperature error level for double safety
2” NPT
Mixed Water
3” NPT
Steam Inlet
1-1/4” NPT
814 IB
(1270 mm)
(1448 mm)
Technical Specifications
Maximum steam pressure: 15 PSIG
Maximum domestic pressure: 150 PSI
Minimum recirculation flow: 10 GPM
Design conditions: Domestic-73 GPM at 100°F delta T using
15 PSIG steam
Complete assembly Lead Free Compliant
All domestic side valve fittings and isolation valves, strainers,
inlet/return check valves, inlet system blend and return
thermometers pre-piped.
DRV – all wetted parts 316 stainless steel
DRV to be UL Listed
Heat exchanger tubes shall be straight 5/8” OD admiralty brass
expanded into Navel Brass tube sheets with a free floating
bolted end cover
Water pipe of type L copper
Fabricated carbon steel frame with machine grade enamel
120 volt power supply required
Secondary (double) safety shut-off valve included
2” NPT
Cold Water
1-1/2” NPT
Recirc Water
(2951±25 mm)
For a submittal drawing, refer to D589756.
BrainScan® – Is an optionally selected 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. BrainScan®
also has an ethernet port and operates as a web server for remote
network access.
BrainScan® has the following outputs:
• Set Point
• Inlet/Outlet Temperature
• Over Temperature Alert
• Error Messages
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
Armstrong Hot Water Group, 221 Armstrong Blvd., Three Rivers, MI 49093 – USA Phone: 269-279-3602, Fax: 269-279-3130
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