237333_indir_fired_h_and_v_units.pdf

CHICOPEE ARMORY REHABILITATION MMD PROJECT NO. 985101

CHICOPEE, MASSACHUSETTS ISSUED FOR BID - 05/20/11

10090 INDIRECT-FIRED H&V UNITS 237333 - 1

SECTION 237333

INDIRECT-FIRED H&V UNITS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 1 Specification Sections, apply to this Section.

B. The requirements of Section 230100, “Basic Mechanical Requirements” apply to work defined by this Section.

C. The requirements of Section 230500, “Basic Mechanical Materials and Methods” apply to work defined by the Section.

1.2 SUMMARY

A. This Section includes indirect-fired H&V units with the following accessories:

1. Gas furnace.

2. Evaporative cooling package.

B. Related Sections include the following:

1. Division 23 Section "Breechings, Chimneys, and Stacks" for vent piping.

1.3 SUBMITTALS

A. Product Data: Include rated capacities, furnished specialties, and accessories.

B. Shop Drawings: Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, and methods of field assembly, components, and location and size of each field connection. Prepare the following by or under the supervision of a qualified professional engineer:

1. Mounting Details: For securing and flashing roof curb to roof structure. Indicate coordinating requirements with roof membrane system.

2. Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to structure and to supported equipment. Include auxiliary motor slides and rails, and base weights.

3. Wiring Diagrams: Power, signal, and control wiring.

C. Startup service reports.

D. Operation and Maintenance Data: For indirect-fired H&V units to include in emergency, operation, and maintenance manuals.

10090 INDIRECT-FIRED H&V UNITS 237333 - 2

E. Warranty: Special warranty specified in this Section.

1.4 QUALITY ASSURANCE

A. Product Options: Drawings indicate size, profiles, and dimensional requirements of indirect-fired H&V units and are based on the specific system indicated. Refer to Division 1 Section

"Product Requirements."

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

C. Comply with NFPA 70.

D. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1, Section 5 - "Systems and

Equipment" and Section 7 - "Construction and Startup."

E. ASHRAE/IESNA 90.1 Compliance: Applicable requirements in ASHRAE/IESNA 90.1, Section 6 - "Heating, Ventilating, and Air-Conditioning."

1.5 COORDINATION

A. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified in Division 3.

1.6 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to replace components listed below of indirect-fired H&V units that fail in materials or workmanship within specified warranty period.

1. Warranty Period for Heat Exchangers: Manufacturer's standard, but not less than five years from date of Substantial Completion.

1.7 EXTRA MATERIALS

A. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Filters: One set(s) for each unit.

2. Fan Belts: One set(s) for each unit.

10090 INDIRECT-FIRED H&V UNITS 237333 - 3

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. AbsolutAire, Inc.

2. Advanced Climate Technologies, Inc.

3. Air Dynamics Co.

4. Air Economy Corp.

5. Applied Air; Mestek, Inc.

6. ARES; Mars Air Products.

7. Bananza Air Management Systems Inc.; Div. of Rapid Engineering, Inc.

8. BessamAire, Inc.

9. Cambridge Engineering, Inc.

10. E. K. Campbell Co.; Mechanical Products Division of Thomas & Betts Corporation.

11. Captive-Air Systems, Inc.

12. CES Group; Ventrol Air Handling Systems, Inc.

13. Des Champs Laboratories Incorporated; a unit of Entrodyne Corporation.

14. Energy Jet U.S.

15. Engineered Air.

16. Greenheck.

17. Hastings Industries; Division of Eric, Inc.

18. Industrial Commercial Engineering.

19. Jackson & Church; Div. of Donlee Technologies Inc.

20. KING.

21. LC Systems.

22. Modine Mfg. Co.; Commercial HVAC&R Division.

23. Powrmatic, Inc.

24. Rapid Engineering, Inc.

25. Reznor-Thomas & Betts Corporation; Mechanical Products Division.

26. Sterling Gas; Mestek, Inc.

27. Temprite; Mestek, Inc.

28. Titan Air Incorporated.

29. Trane Company (The); Unitary Products Group.

30. Weather-Rite, Inc.

2.2 PACKAGED UNITS

A. Factory-assembled, prewired, self-contained unit consisting of cabinet, supply fan, controls, filters, evaporative cooling package, and indirect-fired gas furnace to be installed inside the building.

2.3 CABINET

A. Cabinet: Double-wall galvanized-steel panels, formed to ensure rigidity and supported by galvanized-steel channels or structural channel supports with lifting lugs.

http://www.specagent.com/LookUp/Default.aspx?Section=237333 http://www.specagent.com/LookUp/?ulid=3592&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813742&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813745&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813743&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813744&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822023&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822026&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822028&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813746&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813747&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822029&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813748&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822030&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822031&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813749&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813750&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813751&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822033&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813752&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822034&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813753&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813754&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822037&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813755&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813756&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822041&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822043&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822048&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813757&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456822051&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456813758&mf=04&src=wd

10090 INDIRECT-FIRED H&V UNITS 237333 - 4

B. Access Panels: Lift-out for furnace and fan motor assemblies on both sides of unit.

C. Internal Insulation: Fibrous-glass duct lining, comply with ASTM C 1071, Type II, applied on complete unit .

1. Thickness: 1 inch (25 mm) .

2. Insulation Adhesive: Comply with ASTM C 916, Type I.

3. Mechanical Fasteners: Galvanized steel suitable for adhesive attachment, mechanical attachment, or welding attachment to casing without damaging liner when applied as recommended by manufacturer and without causing air leakage.

D. Finish: Heat-resistant, baked enamel.

E. Discharge: Horizontal -pattern, galvanized-steel assembly with diffusers incorporating individually adjustable vanes.

2.4 SUPPLY-AIR FAN

A. Fan Type: Centrifugal, rated according to AMCA 210; statically and dynamically balanced, galvanized steel; mounted on solid-steel shaft with heavy-duty, self-aligning, permanently lubricated ball bearings .

B. Motor: Open dripproof , single-speed motor.

C. Drive: V-belt drive with matching fan pulley and adjustable motor sheaves and belt assembly.

D. Mounting: Fan wheel, motor, and drives shall be mounted in fan casing with vibration isolators.

2.5 OUTDOOR-AIR INTAKE

2.6 AIR FILTERS

A. Comply with NFPA 90A.

B. Disposable Panel Filters: 2-inch- thick, factory-fabricated, flat-panel-type, disposable air filters with holding frames , with a minimum efficiency report value of 6 according to ASHRAE 52.2 and 90 percent average arrestance according to ASHRAE 52.1].

1. Media: Interlaced glass fibers.

2. Frame: Galvanized steel.

2.7 INDIRECT-FIRED GAS FURNACE

A. Description: Factory assembled, piped, and wired; and complying with ANSI Z21.47, "Gas-

Fired Central Furnaces," and NFPA 54, "National Fuel Gas Code."

1. AGA Approval: Designed and certified by and bearing label of AGA.

2. Burners: Stainless steel.

10090 INDIRECT-FIRED H&V UNITS 237333 - 5

a. Gas Control Valve: Modulating.

b. Fuel: Natural gas.

c. Minimum Thermal Efficiency: 80 percent.

d. Ignition: Electronically controlled electric spark with flame sensor.

B. Power Vent: Integral, motorized centrifugal fan interlocked with gas valve.

C. Combustion-Air Intake: Separate combustion-air intake and vent terminal assembly.

D. Inside Unit External Housing: Steel cabinet with integral support inserts and removable bottom arranged to serve as drain pan.

E. Internal Casing: Aluminized steel, arranged to contain airflow, with duct flanges at inlet and outlet.

F. Heat Exchanger: Stainless steel.

G. Heat-Exchanger Drain Pan: Stainless steel.

H. Safety Controls:

1. Vent Flow Verification: .

2. Control Transformer: 24-V ac.

3. High Limit: Thermal switch or fuse to stop burner.

4. Gas Train: Regulated, redundant, 24-V ac gas valve assembly containing pilot solenoid valve, electronic-modulating temperature control valve, pilot filter, pressure regulator, pilot shutoff, and manual shutoff all in one body.

5. Purge-period timer shall automatically delay burner ignition and bypass low-limit control.

6. Gas Manifold: Safety switches and controls to comply with ANSI standards and IRI.

7. Airflow Proving Switch: Differential pressure switch senses correct airflow before energizing pilot.

8. Automatic-Reset, High-Limit Control Device: Stops burner and closes main gas valve if high-limit temperature is exceeded.

9. Safety Lockout Switch: Locks out ignition sequence if burner fails to light after three tries. Controls are reset manually by turning the unit off and on.

2.8 CONTROLS

A. Factory-wired, fuse-protected control transformer, connection for power supply and field-wired unit to remote control panel.

B. Control Panel: Surface-mounted remote panel, with engraved plastic cover, and the following lights and switches:

1. On-off-auto fan switch.

2. Summer-winter-off switch.

3. Supply-fan operation indicating light.

4. Heating operation indicating light.

5. Thermostat.

10090 INDIRECT-FIRED H&V UNITS 237333 - 6

6. Damper position potentiometer.

7. Cooling operation indicating light.

8. Dirty-filter indicating light operated by unit-mounted differential pressure switch.

9. Safety-lockout indicating light.

C. Refer to Division 23 Section "HVAC Instrumentation and Controls" for control equipment and sequence of operation.

D. Control Devices:

1. Remote Thermostat: Adjustable room thermostat with temperature readout.

2. Remote Setback Thermostat: Adjustable room thermostat without temperature readout.

3. Static-Pressure Transmitter: Nondirectional sensor with suitable range for expected input, and temperature compensated.

4. Fire-Protection Thermostats: Fixed or adjustable settings to operate at not less than 75 deg F (24 deg C) above normal maximum operating temperature.

5. Timers: Seven-day, programming-switch timer with synchronous-timing motor and seven-day dial; continuously charged, nickel-cadmium-battery-driven, eight-hour, power-failure carryover; multiple-switch trippers; minimum of two and maximum of eight signals per day with two normally open and two normally closed output contacts.

6. Timers: Solid-state, programmable time control with 4 separate programs; 24-hour battery carryover; individual on-off-auto switches for each program; 365-day calendar with 20 programmable holidays; choice of fail-safe operation for each program; and system fault alarm.

7. Ionization-Type Smoke Detectors: 24-V dc, nominal; self-restoring; plug-in arrangement; integral visual-indicating light; sensitivity that can be tested and adjusted in place after installation; integral addressable module; remote controllability; responsive to both visible and invisible products of combustion; self-compensating for changes in environmental conditions.

E. Temperature Control: Operates gas valve to maintain supply-air temperature.

1. Operates gas valve to maintain space temperature with wall-mounting, field-wired sensor

[with temperature adjustment,] [and unit-mounted control adjustment] [and adjustment on remote-control panel].

2. Timer shall select remote setback thermostat to maintain space temperature at [50 deg F

(10 deg C)] <Insert deg F (deg C)>.

F. DDC: Stand-alone control module for link between unit controls and DDC system. Control module shall be compatible with temperature-control system specified in Division 23 Section

"HVAC Instrumentation and Controls."

1. Provide start and stop interface relay, and relay to notify DDC system alarm condition.

2. Provide hardware interface or additional sensors as follows:

a. Room temperature.

b. Discharge-air temperature.

c. Furnace operating.

10090 INDIRECT-FIRED H&V UNITS 237333 - 7

2.9 MOTORS

A. Comply with requirements in Division 23 Section "Motors."

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting installation of indirect-fired H&V units.

B. Examine roughing-in for piping, ducts, and electrical systems to verify actual locations of connections before equipment installation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Install gas-fired units according to NFPA 54, "National Fuel Gas Code."

B. Install oil-fired duct heaters and associated fuel and vent piping according to NFPA 31 and applicable local codes and regulations.

C. Install floor-mounted units on [restrained,] spring isolators with minimum 1-inch (25-mm) static deflection; refer to Division 23 Section "Mechanical Vibration and Seismic Controls."

D. Install controls and equipment shipped by manufacturer for field installation with indirect-fired

H&V units.

3.3 CONNECTIONS

A. Piping Connections: Drawings indicate general arrangement of piping, fittings, and specialties.

Install piping adjacent to machine to allow service and maintenance.

1. Gas Piping: Comply with requirements in Division 23 Section "Fuel Gas Piping."

Connect gas piping with shutoff valve and union and with sufficient clearance for burner removal and service. Provide AGA-approved flexible connectors.

B. Duct Connections: Duct installation requirements are specified in Division 23 Section "Metal

Ducts." Drawings indicate the general arrangement of ducts. Connect supply ducts to indirect-fired H&V units with flexible duct connectors. Flexible duct connectors are specified in

Division 23 Section "Duct Accessories."

C. Ground equipment according to Division 26 Section "Grounding and Bonding."

D. Connect wiring according to Division 26 Section "Conductors and Cables."

10090 INDIRECT-FIRED H&V UNITS 237333 - 8

3.4 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

B. Complete installation and startup checks according to manufacturer's written instructions and perform the following:

1. Inspect for visible damage to furnace combustion chamber.

2. Inspect casing insulation for integrity, moisture content, and adhesion.

3. Verify that clearances have been provided for servicing.

4. Verify that controls are connected and operable.

5. Verify that filters are installed.

6. Purge gas line.

7. Inspect and adjust vibration isolators .

8. Verify bearing lubrication.

9. Inspect fan-wheel rotation for movement in correct direction without vibration and binding.

10. Adjust fan belts to proper alignment and tension.

11. Start unit according to manufacturer's written instructions.

12. Complete startup sheets and attach copy with Contractor's startup report.

13. Inspect and record performance of interlocks and protective devices; verify sequences.

14. Operate unit for run-in period recommended by manufacturer.

15. Perform the following operations for both minimum and maximum firing and adjust burner for peak efficiency:

a. Gas Burner:

1) Measure gas pressure at manifold.

2) Measure combustion-air temperature at inlet to combustion chamber.

3) Measure supply-air temperature and volume when burner is at maximum firing rate and when burner is off. Calculate useful heat to supply air.

16. Calibrate thermostats.

17. Adjust and inspect high-temperature limits.

18. Inspect dampers, if any, for proper stroke and interlock with return-air dampers.

19. Start evaporative cooler system and measure and record the following:

a. Leaving-air, dry- and wet-bulb temperatures.

b. Entering-air, dry- and wet-bulb temperatures.

20. Inspect controls for correct sequencing of heating, mixing dampers, refrigeration, and normal and emergency shutdown.

21. Measure and record airflow. Plot fan volumes on fan curve.

22. Verify operation of remote panel, including pilot-operation and failure modes. Inspect the following:

a. High-limit heat.

b. Alarms.

23. After startup and performance testing, change filters, verify bearing lubrication, and adjust belt tension.

10090 INDIRECT-FIRED H&V UNITS 237333 - 9

C. Remove and replace malfunctioning components that do not pass tests and inspections and retest as specified above.

D. Prepare written report of the results of startup services.

3.5 ADJUSTING

A. Adjust initial temperature set points.

B. Set field-adjustable switches and circuit-breaker trip ranges as indicated.

C. Occupancy Adjustments: When requested within 12 months of date of Substantial Completion, provide on-site assistance in adjusting system to suit actual occupied conditions. Provide up to two visits to Project during other-than-normal occupancy hours for this purpose.

3.6 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain indirect-fired H&V units. Refer to Division 1 Section "Closeout

Procedures ."

END OF SECTION 237333