DF8120DWP80
Hot Water Generation – Steam/Water Double Wall
Digital-Flo® Steam/Water Shell and Tube Heat Exchanger
Model DF8120DWP80
DF8120DWP80 is a complete pre-piped parallel (redundant)
instantaneous steam/water shell and tube heater. The assembly
includes a properly sized shell and tube heat exchanger with a
Digital Recirculating Valve (DRV80).
Digital technology provides enhanced water temperature control
accuracy and enhanced user safety in a single control component.
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 1st level hi/lo temp alarm display
• Programmable temperature error level for double safety
shutdown.
Technical Specifications
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Maximum steam pressure: 15 PSIG
Maximum domestic pressure: 150 PSI
Minimum recirculation flow: 10 GPM
Design conditions: Domestic-165 GPM (Redundant Only) 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 shall be double wall with 5/8” copper inner,
¾” ID copper outer tube expanded into steel (steam side) and
brass (water side) tube sheets.
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
3” FLG ANSI 150
Mixed Water
Outlet
2” NPT
20-JD8 F&T
Condensate
Outlet
4” FLG ANSI 150
Steam Inlet
4” FLG ANSI 150
Steam Inlet
75.1”
(1907 mm)
2” NPT
20-JD8 F&T
Condensate
Outlet
57.0”
(1448 mm)
3” FLG ANSI 150
Cold Water
Inlet
2” NPT
Recirc Water
Inlet
127.6±1.0”
(3241±25 mm)
For a submittal drawing, refer to D589804.
Connectivity
SPCO Relay Outputs – Relay which is energized during
operation.
LCD Display – Provides information on set point, delivered
temperature, error messages and alert conditions.
RS485 Serial Port – Connects the DRV to either Modbus RTU or
BrainScan®. (See DF8120DWP80BS for package with BrainScan®.)
Modbus RTU – DRV can be configured to communicate directly
with Building Automation Systems (BAS) using Modbus RTU
protocol.
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
armstronginternational.com
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