United Natural Foods – Prescott

This facility includes dry storage, cold storage, main office, Albert’s organics office, shipping and a remote truck maintenance facility. The cold storage area was not part of our design scope of work.

The main office is a 28,000-square-foot area served by two 30 ton packaged VAV rooftop units with electric heat, economizers, fan terminal units with electric heat (serving perimeter zones) and variable air volume boxes with electric heat (serving interior zones) The IT/Data room is served by dedicated 4 ton unit and the print room has a dedicated 3 ton unit. The operations office is served by a 3-ton constant volume packaged rooftop units with gas heat. The Albert’s organics office is also served by a dedicated constant volume packaged rooftop unit with gas heat. The office areas and Albert’s Organics area are controlled by a building automation system.

The design for the dry storage was a 55-degree indoor temperature (winter), and a summer ventilation rate at one air change per hour. The heating was done with three direct fired make up air units with factory installed non-fused disconnects, motor starters, filter sections, inlet temperature sensors, freeze protection and industrial control panels with night set back. The summer ventilation system includes three up blast fans with butterfly dampers, magnetic latches, and motors out of the air stream for serviceability. The fans are interlocked with six combination louver/dampers with flange frames, mill finish and insect screens. In conjunction with the summer ventilation, the facility also includes HVLS fans.

The engine room is ventilated 24/7 with a direct fired make up air unit interlocked with a roof mounted exhaust fan. The engine room also includes two emergency exhaust fans that are interlocked with a combination louver/damper and they are controlled by the refrigeration control system in the event of an ammonia leak.

The stand-alone truck maintenance facility features an office area, truck repair area, and a truck wash bay. The office is conditioned by a 3-ton packaged rooftop unit with gas heat, economizer and programmable thermostat. The repair area is heated with a direct fired make up air unit interlocked with a roof mounted exhaust fan. The repair air also includes a car-mon truck exhaust system. The wash bay is heated with two (2) gas fired radiant heaters.