Water Temperature Control—Recirculation Systems—Digital

DMC2

Model DMC 2 features two "parallel" DRV 80 pre-piped and pressure tested complete with isolation valves, strainers, mixed return flow indicator, check valves, thermometers and
an optionally selected system circulating pump for systems which experience diverse user draw-off from 0 to 300 GPM.

Each DRV 80 "The Big Brain" is a fully digital recirculating valve (DRV) for "point of source" or mechanical room based installation. DRV 80 is designed specifically to be the primary water temperature controller in a continuously pumped recirculating hot water system.

Model DMC 1 is a single installer/operator programmable "packaged solution" for systems which experience diverse user draw-off between 0 to 150 GPM.

Operational Specifications

The enhanced accuracy possible with DRV80 digital technology, combined with its data input/output communication capability equals:

• Accurate control of blended water drawn from the system at a point of use typically within +/-2°F at draw off points a minimum of 5m downstream of mixing valve during consistent system demand periods
• Operational water pressure of 10 -150 psig
• Minimum valve inlet to outlet temperature requirement (system recirculation temperature loss) of 2°F
• 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
• Maintain a consistent system "idling" temperature and control temperature creep without the use of a manual throttling device or balance valve.
• System shall not require a temperature activated pump shut-off device (aquastat).
• Programmable set point range of 100-160°F (37-71°C) plus full hot/full cold
• Ability to thermally disinfect at recommended temperatures
• Programmable 1st level high/low temp alarm display
• Programmable temperature error level for safety shutdown

Technical Specifications

• 100-240 V Power supply (12 VAC output)
• 2 x 4-20 mA current loop interfaces:
Input: Setpoint Selection
Output: Measured Blend Temperature
• Relay output: 24V DC/240 V AC SPCO
Error Relay: Activated in alarm or error mode
• Serial Connection Data Port*
• Optional External Network Adapter*
• Serial Connection Data Port*
• Optional External Network Adapter*
• Stainless Steel Construction

DMC 2

Supplied as a pre-plumbed, pressure-tested and mounted to an enameled steel frame comprising:

• 2 ea: DRV 80 Digital Recirculation System Controllers
• 4" inlet/outlet piping with flanged connections
• System isolation valves
• Inlet strainers
• Mixed return flow indicator
• Check valves
• Thermometers

DMC 22

As above with 3/4 hp system circulating pump.