Commercial Architecture May 2017 - 60

hvac

PROJECT

ed at key points within the panel to enable an immediate response to changes in fixture demand-and-supply water conditions. A built-in optional pump provides
recirculation of the tempered-water loop. This reduces the wait time at point-of-use
fixtures and conserves water.
The system's sanitization mode allows buildings with a thermal-eradication protocol in place to control water-borne bacteria to deliver a higher water temperature for
a pre-set duration to allow building maintenance staff sufficient time to open all of
the fixtures. IntelliStation can be connected to a building-automation system to provide ready access to a range of temperature and pressure measurements and allow
adjustment of the outlet temperature setting within a pre-programmed range. BACnet IP, BACnet MSTP, and Modbus protocols are all supported.
Sizing and specifying a digital mixing station is relatively simple, with key parameters that include overall gpm, load of the building, pipe sizes, height of the structure,

Above. Digital mixing of the hotel's domestic hot water provides exact control of water temperature at all
points of use.

number of rooms and fixtures, and size of utilities such as the laundry and kitchen
Below. Joel Ryun, Lexington Plumbing, checks measuring amp draw at the system's main control.

facilities.
Designers of large plumbing systems are discovering that a digital mixing system
is the most effective way to deliver properly mixed water throughout a hot-water recirculation loop.
Digital mixing allows engineers or facility managers to select a desired hot-water
temperature and to control and monitor the entire water-distribution system. For
even greater control, these systems can be installed as part of an ASSE-compliant
(American Society of Safety Engineers, Park Ridge, IL) water-distribution system,
including point-of-use mixing valves at each fixture in the plumbing system. This
ensures that hot-water storage temperatures can be kept at levels lethal to pathogens,

ONLY

DAYS

and then mixed to safer temperature levels at points of distribution and use. Most
systems are also field-configurable without the need for a laptop or special software.
Since the installation of digital mixing technology at the Kansas City hotel, facility managers have yet to receive a hot-water complaint-with hot water arriving at taps
and showers quickly and at a safe, consistent temperature.
Varying pressures and temperature fluctuations throughout the hotel's hot-water
system no longer pose a threat. While 125 F water is sent to guest rooms in an instant,
a second hot-water loop runs 150 F water to the kitchen and laundry areas where
higher temperatures are needed for cooking and cleaning, and water is safely generated and stored at a germ-scorching 175 F.

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Rather than experiencing the constant headache of boiler-room problems and
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Want more information? To download the information listed below, visit
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CIRCLE 226

Download a brochure on IntelliStation.

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Table of Contents for the Digital Edition of Commercial Architecture May 2017