The mechanical scope of the Medical Clinic Building at Marine Corps Air Ground Combat Center (MCAGCC) in Twentynine Palms, CA included two new variable air volume Air Handling Units (AHUs) with a total of 61 reheat terminal units, one new Energy Recover Unit (ERU), one new variable flow Heating Hot Water (HHW) system with two boilers and two pumps, one new variable flow Chilled Water System with one chiller and two pumps, one new Domestic Hot Water (DHW) system, two Fan Coil Units (FCUs), metering of gas, electric, and water usage, and various other temperature monitoring.
We were responsible for providing and programming the control system for the mechanical equipment listed above. Due to the configuration of the ERU outside air fan and the AHU supply fans, there were many pressure-based sequencing challenges that had to be overcome for this system. Our team worked diligently to create a sequence that would function properly while meeting the design intent. This intricate ERU/AHU program consisted of multiple modes (economizer and minimum outside air) and worked to control supply air temperature, supply air humidity, supply air flow, outside air flow, mixed air plenum pressure, and relief air plenum pressure.
Customer: Naval Facilities Engineering Command / MCAGCC Twentynine Palms
Mechanical Engineer: Sherlock, Smith and Adams, Inc.
General Contractor: T.B. Penick & Sons, Inc.
Mechanical Contractor: W.R. Robbins