TAB Journal Spring 2014 - (Page 8)

The Trouble With Canned Specs John A Balanik, TBE R.H. Cochran and Associates, Inc. any times in the industry, the same specifications are being applied to several different projects. These can be referred to as "canned specs". For whatever reason, whether to save time or money or both, a very involved specification will be applied to a straightforward job. What applies to a school or library may not work for a furnace project. Recently, testing and balancing was conducted at a veteran's homeless shelter, which utilized several residential-type furnaces. The furnaces served VVT boxes with bypass type static pressure control. These units were equipped with outside air duct connections at the return air to each furnace. Overall, it was a straightforward project. The units were balanced with some minor complications that were corrected by the installing contractor, allowing work to be completed in a timely manner. 8 Several months after completion, word was received from the mechanical contractor that the architect would not release the retainer to the contractor. His reasoning was that according to the specifications, a building flush was to be performed prior to occupancy. Most times a building flush is performed with air handling units that have an economizer function, The economizer is placed into a very high outside air setting to flush the building of odors, VOC's and toxins from drying paints and adhesives. Normally, the economizer is set to 60-100% outside air for a set period of time. The amount of time required is determined by the Engineer or Commissioning Authority. During this time, the unit or units must run continuously without being disrupted. If the units are shut down for any reason, the flush begins again from the beginning. TAB Journal Spring 2014

Table of Contents for the Digital Edition of TAB Journal Spring 2014

Indirectly Determining Air Volume
Calibration and Balancing of Phoenix Valves in Laboratories
The Trouble with Canned Specs
Environmental Considerations of the Southwest
Airflow Measuring Station Considerations
Putting the Proper "SPIN" on Things
Chasing the Air

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