Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit
armstrong
international.com for up-to-date information.
Page 2 of 44
Armstrong
International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
Tel. (269) 279-3602 Fax. (269) 279-3130
General Description
Digital-Flo
®
is an instantaneous water heater that heats on demand and stores very little hot water. Digital-Flo
®
transfers heat
from steam to cold water and then precisely blends hot water, cold water, and recirc return water to a programmable mixed
water outlet setpoint.
Digital-Flo
®
water heaters utilize digital technology to monitor the hot water inlet, the cold water/recirc return inlet, and the
mixed water outlet. Digital-Flo
®
is supplied pre-piped and pressure tested with a Digital Recirculating Valve (The Brain
®
–
Models DRV40, DRV50, and DRV80).
Two (2) inlet and one (1) outlet thermistors integral to the DRV provide time-proven water temperature control accuracy. The
precise control of the DRV eliminates the requirement for separate components typically associated with steam-to-water heat
exchangers:
• PID temperature controller
• High temperature limit thermostat
• High temperature limit controller
• Cold water injection valve
• Internal circulating pump
• Compressed air requirement
All Digital-Flo
®
water heaters may be integrated directly into building automation systems (BAS) that communicate via
Modbus RTU. In the presence of other protocols (Modbus, BACnet
™
, and LonWorks
™
) SAGE
™
can provide seamless
monitoring, measuring, and reporting directly to office PC’s or mobile apps.
Digital-Flo
®
is engineered to precision and crafted with pride to deliver years of superior performance and customer
satisfaction, provided:
1. Installation, commissioning, operation and maintenance are in accordance with the recommendations provided in this
product installation and operation manual (IOM), in addition to generally-accepted plumbing, pipe-fitting and maintenance
guidelines.
2. Periodic attention is given as necessary to maintaining the product, the accessory fittings & components, and the overall
plumbing/distribution system in sound functional order.
Standard components include (see Typical Layout diagram that follows for specific locations):
• The Brain DRV40, DRV50, or DRV80 Digital Recirculating Valve
• Heat exchanger module (shell fabricated in accordance with the ASME Section VIII Division 1 Boiler and Pressure Vessel
Code, aka, an ASME “U-stamped” pressure vessel)
• Thermometers & Pressure Gauges
• Check valves
• Inlet strainer(s)
• Isolation valves
• Safety shut-off valve
An application-related, low surface temperature option is available that requires a secondary steam control valve for
conditions where high mineral content water causes excessive heat exchanger scaling.
Please note:
1. Because the Digital-Flo
®
is customizable, there may be optional components that are not addressed in this installation and
operation manual (IOM).
2. Armstrong reserves the right to make design or specification changes without notification.
Summary of Contents for Digital-Flo DF41540
Page 45: ...Notes...
