General Construction Specifications
PART 1 - GENERAL
01 WORK INCLUDED
A. Contractor shall furnish all labor, materials, tools, and services required to clean, start-up, or otherwise put into service, mechanical systems.
B. Start-up of chillers, boilers, or other where specified, shall be checked out and started up by factory trained mechanics.
PART 2 - PRODUCTS
Not Used
PART 3 - EXECUTION
02 MECHANICAL EQUIPMENT CLEANING
A. Remove, or otherwise repair, dents, scratches, and/or foreign materials (paint, drywall compound, etc.) from mechanical and touch-up damaged finishes using matching paint provided by unit manufacturer. Surfaces to receive paint shall be made free of dirt and moisture before painting.
B. Remove construction debris from mechanical rooms before start-up of located within those rooms. Air handling unit casings, fan coil cabinets, etc., shall be vacuumed prior to start-up to remove dust and debris accumulated during storage and/or construction.
C. Air conditioning units, air handling units, etc., shall not be operated without filters.
03 MECHANICAL DUCTWORK CLEANING
A. Inside surfaces of supply ductwork downstream of 90% efficient final filters or greater shall be wiped clean prior to installation, and care shall be taken during construction to cover openings to prevent entrance of dust and dirt.
B. Ductwork other than described above shall be installed with clean surfaces. Care shall be taken when storing ductwork on-site to protect inside surfaces from dirt and dust.
C. Clean surfaces of all air distribution diffusers, grilles, registers, etc. Where finish is irregular or damaged, finish shall be touched-up with paint supplied by manufacturer.
04 MECHANICAL PIPING SYSTEM CLEANING
A. Piping shall be installed with clean surfaces. Care shall be taken during installation to reduce the amount of metal chips, welding slag, cutting oil, dirt, etc. entrapped in the piping system.
B. Water piping systems shall be filled, vented and flushed with all valves positioned to bypass heating and cooling equipment. Install temporary flushing loops at control valve locations to flush system before installation of control valves. Strainers shall be checked frequently and cleaned as required. Piping system shall be continuously flushed until water is clear, but not less than 2 hours in duration, and then drained.
C. Water piping system shall then be filled with fresh clean water with one pound of Trisodium Phosphate added for every 50 gallons of system water. This solution shall be circulated through piping and HVAC for a minimum of 4 hours, and then drained.
D. Water piping system shall then be refilled with fresh clean water and tested for pH. For pH greater than or equal to 8.0, or less than or equal to 7.0, repeat the cleaning process described in Paragraph C. above.
E. Steam and condensate piping shall be flushed with valves arranged to bypass traps. Condensate shall be wasted to sewer until no dirt, scale, or grease, etc. appears in condensate. Dirt legs shall be flushed free of dirt and scale. Install temporary conical or disc type strainers for flushing process at flanged connections upstream of pocket areas. Remove and clean strainers between flushing cycles. At completion of flushing procedure, the temporary strainers shall be removed. Strainer baskets in the piping system shall be removed, cleaned, and replaced. Traps shall be checked for scale or debris before being placed into service. Steam system shall then be filled with clean make-up water through the boiler feed system and placed into service.
F. Refrigerant piping systems shall be cleaned in accordance with methods described in Section 15065.
05 MECHANICAL SYSTEMS START-UP
A. Before start-up of mechanical verify the following:
1. All interconnecting piping is complete and has been pressure tested in accordance with Section 15060.
2. Electrical power wiring is complete and that the correct voltage has been supplied to equipment. Disconnect switches have been installed.
3. Insulation of chill water, refrigerant, condensate piping, ductwork, etc., is completed and that condensation will not be formed by operating mechanical systems causing damage to work in place, etc.
4. Work dependent upon other trades is complete; i.e., make-up water, drains, etc.
5. Auxiliary sub-systems are operational; i.e., boilers/boiler feed units/condensate return units, etc.
6. Filters, strainers, etc., are in place and in good working order.
7. No conditions exist which may be hazardous; i.e., gas vents installed and insulated, exposed steam or hot water piping insulated, temperature and pressure relief valves installed, etc.
B. Start-up of chillers, boilers, or any other so specified to have "Factory Start-up" shall be performed by factory trained service personnel. Contractor shall give a 7-day advance notice to manufacturer's representative for scheduling start-up date. Contractor shall complete, sign, and deliver start-up item checklist (if required or when furnished) before scheduled start-up date. Contractor shall furnish sufficient materials, labor, etc., when requested, to assist the factory trained personnel in start-up procedures.
C. Start-up of Air Distribution Systems:
1. Verify installation for conformity to design. All supply, return and exhaust ducts terminated and pressure tested for leakage as required by specifications.
2. All volume, fire and smoke dampers properly located and functional. All dampers shall be fully open or in the neutral position. Manual damper gradients and spin damper handles should be exposed through insulation. Dampers serving requirements of minimum and maximum outside, return and relief air shall provide tight closure and full opening, smooth and free operation.
3. All supply, return, exhaust and transfer grilles, registers, diffusers, high pressure terminal units and filters installed.
4. Air handling systems, units and associated apparatus, such as heating and cooling coils, filter sections, access doors, etc., shall be blanked and/or sealed to eliminate excessive by-pass or leakage of air.
5. All fans (supply, return and exhaust) operating at full load and verified for freedom from vibration, proper fan rotation and belt tension; heater elements in motor starters to be of proper size and rating. Check motor amperage and verify that it is under nameplate rating.
D. Start-up of Water Circulating Systems:
1. Check and verify pump alignment and rotation. Verify location of gage cocks or PT test plugs.
2. Open all valves to full open position, close by-pass stop valves. Set mixing valves to full flow through system components. Remove and clean all strainers. Repeat operation until circulating water is clean.
3. Record each pump motor amperage on each phase and voltage after reaching rated speed. Readings shall not exceed nameplate rating.
4. Verify electrical heater elements to be of proper size and rating.
5. All water circulating systems shall be full and free of air; expansion tanks set for proper water level; all air vents installed at high points of systems and operating freely. System static pressure to be set at 10 feet water column above highest system elevation.
6. Check and set operating temperatures of heat exchangers to design requirements.
7. Verify that piping to coils is complete and set for counterflow. Verify location of thermometer wells, gage cocks and balance cocks for coils.
3.02 PREPARATION OF SYSTEMS FOR TEST AND BALANCE
A. Notification of System Readiness: After completion of the work above, the project contractor shall notify the testing and balancing firm, certifying that the work has been accomplished and that the building and the air conditioning systems are in readiness for testing, adjusting, and balancing.
B. The Contractor shall make any changes in the sheaves, belts and dampers required for correct balance as required by the testing and balancing firm.
C. The Contractor shall provide and coordinate services of qualified, responsible contractors, suppliers and personnel as required to correct, repair, or replace any and all deficient items or conditions found during the testing, adjusting and balancing period.
D. In order that all systems may be properly tested, balanced, and adjusted as required herein by these specifications, the Contractor shall operate said systems at his expense for the length of time necessary to properly verify their completion and readiness for testing and balance. This length of time shall be acceptable to the Architect.
E. Project contract completion schedules shall provide sufficient time to permit the completion of testing and balance services prior to final inspection.
F. The plans and specifications have indicated valves, dampers and miscellaneous adjustment devices for the purpose of adjustment to obtain optimum operating conditions, and it will be the responsibility of the Contractor to install these devices in a manner that will leave them accessible and readily adjustable. Should any such device not be readily accessible, the Contractor shall provide access as requested by the testing and balancing firm. Also, any malfunction encountered by testing and balancing personnel and reported to the Contractor shall be corrected by the Contractor immediately so the balancing work can proceed.
END OF SECTION
