23_52_00_IEI-Heating_Boilers.pdf

Crescent District Office / Revised 05-12-2014 23 52 00 - 1 of 4 HEATING BOILERS

SECTION 23 52 00 - HEATING BOILERS

PART 1 - GENERAL

1.01 SUMMARY

A. Work included: Provision of materials, installation and testing of:

1. Condensing Boilers

1.02 RELATED SECTIONS

A. Contents of Division 23, HVAC and Division 01, General Requirements apply to this Section.

B. In addition, reference the following:

1.03 REFERENCES AND STANDARDS

A. References and Standards as required by Section 23 00 00, HVAC Basic Requirements and

Division 01, General Requirements.

1.04 SUBMITTALS

A. Submittals as required by Section 23 00 00, HVAC Basic Requirements and Division 01, General Requirements.

B. In addition, provide:

1. Product Data: Provide data indicating general assembly, components, controls, safety controls, flue venting system, and wiring diagrams with electrical characteristics and connection requirements, and service connections.

2. Shop Drawings: Indicate general assembly, components, controls, flue venting, safety controls, and wiring diagrams with electrical characteristics and connection requirements, and service connections.

3. Manufacturer's Instructions: Indicate assembly, support details, connection requirements, and include start-up instructions.

4. Manufacturer's Field Reports: Indicate condition of equipment after start-up including control settings and performance chart of control system.

5. Warranty: Submit manufacturer warranty and ensure forms have been completed in

Contracting Officer's name and registered with manufacturer.

6. Provide documentation indicating compliance with local air quality management district.

1.05 QUALITY ASSURANCE

A. Quality assurance as required by Section 23 00 00, HVAC Basic Requirements and Division

01, General Requirements.

B. In addition, meet the following:

1. Manufacturer Qualifications: Company specializing in manufacturing the type of products specified in this Section, with minimum three years of documented experience.

2. Installer Qualifications: Company specializing in installing and servicing the products specified in this Section, with minimum 5 years of documented experience and approved by manufacturer.

Crescent District Office / Revised 05-12-2014 23 52 00 - 2 of 4 HEATING BOILERS

3. Air Quality: Provide documentation showing compliance with local Air Quality

Management District.

4. Equipment must meet local air quality management district requirements. Do not bid equipment that does not comply.

1.06 WARRANTY

A. Warranty of materials and workmanship as required by Section 23 00 00, HVAC Basic

Requirements and Division 01, General Requirements.

B. In addition, provide:

1. Warranty: Submit manufacturer warranty and ensure forms have been completed in

Contracting Officer's name and registered with manufacturer.

PART 2 - PRODUCTS

2.01 MANUFACTURERS

A. Condensing Boilers:

1. Hydrotherm KN

2. Laars NTH

3. Fulton CAL

4. Or approved equivalent.

2.02 CONDENSING BOILERS

A. General: Packaged condensing hot water boiler, complete with boiler fittings, burner, UL/FM approved gas train suitable for natural gas, safety shut-off valve, gas differential regulator, air/fuel valve, gas pressure regulator, neutralization tank and boiler management system. Boiler constructed in accordance with Section IV of ASME Code for hot water heating boilers with a maximum working pressure of 125 PSI. CSA approved for direct vent boiler and compliance with ASME CSD-1 Code.

B. Performance: AGA certified for minimum of 86 percent efficiency at 160 degrees F entering water temperature and 93 percent efficient at 100 degrees F entering water temperature at full fire. Unit must have increased efficiencies at reduced loading and entering water temperatures.

Capacities as indicated on drawings.

C. Factory Test: Provide certified factory performance test and submit results.

D. Boiler Shell/Tubes: Vertical firetube type with stainless steel tubes and tube sheets. ASME certified, labeled, stamped and designed for 30 PSI water. Jacket insulation to be minimum of

2-inch thick fiberglass and encased in 18 gauge metal cabinet with prime and finish coat of paint. Boiler mounted on structural steel frame design and designed to local seismic zone requirements.

E. Condensate Neutralization System: Assembly complete with P-trap and sacrificial limestone chips.

F. Burner: All burner material exposed to the combustion zone to be of stainless steel construction. Variable speed forced draft blower connected to venturi tube modulates fuel and air mixture for minimum of 5:1 turndown and compensate for changes in barometric pressure, temperature and humidity. Provide burner complete with gas-electric ignition, fuel train, flame management panel and required valves. Burner operates with CO emissions of less than 10 ppm

Crescent District Office / Revised 05-12-2014 23 52 00 - 3 of 4 HEATING BOILERS at 3 percent excess O2 and operates with NOx emissions of less than 18 ppm at 3 percent excess O2 over entire turndown range stainless steel exhaust manifold.

G. Boiler Trim: Safety valve ASME Section IV approved. Provide temperature and pressure gauge, low water cut-out, manual reset, operating controller, modulating controller and high limit temperature controller.

H. Gas Train: Factory package gas train to include manual shutoff valve, pressure regulating valve, dual safety gas valves, manual test valve, high-low pressure switches, manifold pressure gauge and butterfly gas valve. Gas train meets FM insurance requirements, as well as UL and

CSD-1 requirements. Gas pressure available at gas train is 2 PSI.

I. Minimum Water Temperature: 40 degrees F without any failure due to thermal shock or fireside condensation.

J. Boiler Controls: Panel mounted microprocessor based operating controls and safety devices for automatic operation. Controls to include operating controller with display board, control circuit transformer, fusing, electronic flame safeguard control, burner management system, operating status and fault indicators, air switch, relays, terminal strips and blower motor variable speed drive. Units prewired and include operating indicating light and alarm bell with silencer, single point electrical connection in NEMA 1 enclosure. Controller to include remote communications device for boiler management interface. Controller to be CSA listed. Controller to perform following functions:

1. Electronic ignition

2. Burner sequencing and flame supervision with safe start check, pre-purge, direct spark ignition and post purge. Flame rod to prove combustion.

3. Safety shutdown with display of error.

4. Gas pressure supervision, air proving, high air pressure, high limit and frost protection.

5. Display hot water supply temperature set point with ability to reset temperature based on signal from boiler management system.

6. Dual over-temperature protection with manual reset in accordance with ASME and

CSD-1.

7. Dual electric low water cut-off with manual reset in accordance with ASME and CSD-1.

K. Boiler management system be capable of interfacing with BAS. Reference Section 23 09 00.

Interface to share following information:

1. Real time load (MBH)

2. Boiler status

3. Firing rate for each boiler

4. Gas Burner: Forced draft for natural gas, adjustable combustion air supply, gas pressure regulator, gas valves, manual shut-off, intermittent spark or glow coil ignition, flame sensing device and automatic 100 percent shut off. Burner includes drawer assembly with flame retention head and diffuser, blower and motor, orifices, gas train, main safety gas valve and low-high pressure gas switches.

L. Flue Venting: UL Listed stainless steel AL-29-4C positive pressure venting materials. Sized and installed per manufacturer's installation in accordance with local mechanical code.

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install boiler in accordance with manufacturer’s instructions.

B. Provide connection of natural gas service in accordance with requirements of NFPA 54 and applicable codes, and fuel oil tanks. Pipe gas vents to atmosphere.

Crescent District Office / Revised 05-12-2014 23 52 00 - 4 of 4 HEATING BOILERS

C. Install boiler on concrete housekeeping base, sized minimum 6-inches larger than boiler base.

D. Provide piping connections and accessories as indicated. Reference Division 23, HVAC, Hydronic Specialties.

E. Pipe relief valves to nearest floor drains.

F. Install circulator on boiler.

G. Provide for connection to electrical service.

H. Provide all wiring between control panels and devices and unit.

I. Pipe boiler drains to nearest floor drains.

J. Pipe condensate connections from boiler to neutralization system and from there to nearest floor drain.

3.02 SYSTEM START-UP

A. Provide the services of manufacturer's field representative for starting and testing unit.

B. After installation and pipe flushing, boil out boilers using chemical and procedure as recommended and supervised by boiler manufacturer.

C. Manufacturer shall provide report verifying that boilers have been inspected, cleaned and tested according to their recommendations.

3.03 CLOSEOUT ACTIVITIES

A. Train operating personnel in operation and maintenance of units.

B. Provide the services of manufacturer's field representative to conduct training.

3.04 BOILER SHUTDOWN

A. Remote switch: Provide 1-inch diameter turn-reset red pushbutton to disconnect power to the boiler burner controls and gas service in room. Install pushbutton under clear, impact-resistant flip lid. Provide red phenol label "Emergency Boiler Shutdown" located above pushbutton.

Pushbutton to be mounted by latch side of each boiler room door within interior of boiler room, unless otherwise directed by the Government. Provide electrical wiring and raceway as necessary for installation. Provide additional relay and wiring to cut power to gas solenoid valves in boiler room not integral to boilers. Reference drawings for gas solenoid valve locations.

END OF SECTION