Engineered Systems - October 2008 - (Page 34)

HVACRDesignerTips BY AMANDA MCKEW DESIGN REVIEW / DESIGN-BUILD Hotels, Motels, and Dormitories Equipment type: Energy recovery unit Equipment designation: ERU-1 Barcode designation: 111111 Area served: Dormitory rooms Equipment location: In equipment room • Can the fancoils, boiler, energy recovery and rooftop unit, pumps, and air cooled chiller be installed without removing other HVAC, electrical, plumbing, communication, and/or fire protection distribution or equipment? ❍ ❍ • Has consideration been given to future expansion of system? ❍ ❍ • Has pressure testing of pipe distribution been determined in scope of work? ❍ ❍ ❍ • Has system flushing been determined in scope of work? ❍ • Has condensate drain piping be addressed? ❍ ❍ • Has ERU-1 freeze-stat protection been considered? ❍ ❍ • Has consideration been given to the manufacturer’s recommended clearance around equipment ❍ ❍ for service? DESIGN REVIEW [Y] [N] ❍ ❍ ❍ unit ❍ unit ❍ • Verify adequate ventilation. ❍ • Spot-check air quantity by cfm/sq ft. ❍ • Spot-check heating capacity based on Btuh/sq ft. ❍ • Review control drawings and specifications and confirm inlet and outlet temperature setpoints are specified. ❍ • Review control drawings and specifications and confirm inlet and outlet humidity setpoints are specified. ❍ • Review control drawings and specifications and confirm unit drybulb and wetbulb temperature high/low alarm limits are specified. ❍ • Review control drawings and specifications and confirm alarm sequences are specified. ❍ • Review control drawings and specifications to determine if will operate completely through the BAS/BMS. ❍ • Check for potential short-circuiting of outdoor air with exhaust air at unit. ❍ ❍ ❍ unit ❍ ❍ GENERAL CONDITIONS CONSIDERATIONS / REQUIREMENTS [Y] [N] ❍ ❍ ❍ • Have the necessary installation and operating permits been acquired? ❍ • Have the insurance certificates been submitted to building owner? ❍ • Will there be an extended warranty on the equipment? ❍ DESIGN REVIEW AND TRICKS OF THE TRADE ELECTRICAL INSPECTION / REQUIREMENTS [Y] [N] • What are the new electrical requirements for the new ERU, RTU-1, etc.? ❍ • Is there adequate electrical power to meet new electrical load from the new equipment? ❍ • Is there adequate electrical power coming in from the street? ❍ • Identify electrical scope of work required with HVAC equipment. ❍ • Will emergency power be a requirement for the building major mechanical systems? ❍ • Are electrical connections tight and secure? ❍ • Have the fuses/circuit and wire sizes been checked and verified? ❍ • What electrical system components (existing conduits, etc.) will require removal, reinstallation, and/or relocation to accommodate new HVAC units? ❍ • Are there existing electrical code issues that should be address at this time? ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ • Create an airflow diagram indicating cfm, pressure drops, and velocities for design, TAB, commissioning, and record documents for future retrofit needs. • Consider routine maintenance can be achieved without shutting unit down. • Attach equipment schedule and design criteria to checklist. • Attach sequence of operation to checklist. REFERENCE • 2008 ASHRAE Handbook – HVAC Systems and Equipment, Chapter 1, “System Analysis and Selection,” and Chapter 5, “In Room Terminal Systems.” • 2007 ASHRAE Handbook – Applications, Chapter 5 “Hotels, Motels and Dormitories.” • 2005 ASHRAE Handbook – Fundamentals, Chapter 35, “Duct Design,” and Chapter 36, ”Pipe Sizing.” ❍ ❍ NOTE • Refer to equipment manufacturers’ literature for additional data and requirements. • Refer to building owner standards and guidelines for additional criteria. ES If you have any comments, suggestions, or questions regarding this designer checklist, contact Amanda McKew at amckew@ rdkengineers.com. HVAC INSPECTION / REQUIREMENTS • Has the selection of fancoils, boiler, energy recovery and rooftop unit, pumps, and air cooled chiller been approved and signed off by owner? • Has the minimum gas pressure been determined for the heating? • Verify that gas piping is complete and correct. • Can the HVAC equipment be installed with access for maintenance? [Y] [N] ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ 34 En gi neer ed S y stem s October 2008

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Engineered Systems - October 2008 Contents Editor’s Note Letters Back2Basics HVAC Challenge Case in Point Commissioning Building Automation HydroTech HVACR Designer Tips Special Insert: Engineer's Technical Library Fall 2008 Living Wild! Chilled Beams in Chicago Phoenix Convention Center: On The Rise Cold-Climate HVAC Challenges Humidification Strategies For Data Centers & Network Rooms Special Advertising Supplement: Tabb Talk Computers & Software Issues & Events Products Literature & Catalogs Glossary Classifieds Advertiser Index Tomorrow’s Environment

Engineered Systems - October 2008

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