New England Business Service (NEBS) - Townsend, MA
New England Business Service's Townsend Massachusetts facility is a paper forms
The building's major mechanical systems include:
|11 - 20 ton York Package Heating/Cooling Units with Economizers|
|14 - 15 tons or less Heating/Cooling Units|
|9 - Steam Humidifiers|
|1 - Gas fired Hot Water Boiler|
|1 - Reciprocating Chiller|
This project involved replacing the existing DDC system with a Delta Controls ORCA
Series DDC system. While updating the equipment, corporate and local facility
management put forth a list of goals that they wanted to accomplish during the
replacement. These included:
- Minimize operating and energy expenses.
- Track the buildings mechanical performance.
- Control the 9 new York heating/cooling units.
- Control the ventilation requirements using motorized dampers and Carbon Dioxide sensors.
- Control the buildings internal static pressure.
- Install a Graphical Operator Interface.
- Reduce the operator workload in the day-to-day operations of the HVAC system.
R. L. Shields Associates, Inc. installed a Delta Controls ORCA Series DCU Controller to
replace the existing Andover Control's AC256 system. The 9 new York heating/cooling
units as well as the 16 existing heating/cooling units are being controlled by Delta
Controls Zone Controllers. They are networked together and connected to the DCU
To control ventilation requirements, Carbon Dioxide (CO2) sensors were installed in the
production and warehouse areas. As CO2 levels rise, the outside dampers modulate
open to keep the CO2 readings below maximum acceptable levels. Carbon Dioxide has
become an acceptable method of controlling ventilation requirements and is recognized by
ASHRAE as one method of monitoring air quality.
To control building static pressures, a network of sensing ports was installed around
the four sides of the building. This building has a history of running a negative
static pressure. This was a concern because of drafts and blowing paper. Since
the Delta Zone Controllers allowed full control over the dampers in the 9 new York units,
as the static pressure starts to go negative, the dampers begin to modulate open to allow
outside air to enter the building through the cooling units rather than the doors.
Some special software was developed by R. L. Shields Associates for use on this site
- Demand Side Management Software - This software is used to calculate the electrical
demand, consumption and projects demand based on a minute by minute calculation. This
enables the computer and operator to make changes in operation to avoid setting demand
peaks. To better understand Electric Demand, click here.
- Sunrise/Sunset Time Calculation - This controls the parking lot and building exterior
lighting based on Sunrise and Sunset. The eliminates the problems associated with power
failures skewing the time clocks and provides for the adjustment to Daylight Savings Time
and Daylight Standard Time.
- Humidity Control Software - In the printing business, humidity plays a very important
roll. When multi-part forms are printed, paper stretch is very important. In
many cases, the first sheet is printed at a different time from the second, third, fourth,
etc. sheets. If the stretch is different from one run to the next, the sheets won't
line up when assembled. Special software was created to control the
humidifiers when adding moisture, and controlling the HVAC units when dehumidifying.
Because the building will be using some energy savings strategies, this software
will be using both relative humidity and dewpoint as control references. To better understand Humidity, click here.
- Building Pressure Control Software - Building static pressure was always negative when
referenced to outside pressure. At times it was very difficult to open doors.
Special software was created to use the economizer dampers as air inlets to equalize the
inside pressure of the building. If the roof top units fans are running, the
building can actually be pressurized slightly. This eliminated strong drafts and
provided filtered air to the facility. The building now runs approximately .05
inches of water column positive pressure as a result of this software, which is the
Links to additional graphics for this project
What do the Operators say about the project?
For more information on this project or Delta Controls, contact:
R. L. Shields Associates, Inc.
27 Wentworth Drive
Bedford, NH 03110
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