B09_Updated_Specification_Section_23_52_39_-_FIRE_TUBE_BOILERS_Amd5_0005.pdf

REPLACE DEFICIENT VC/HQ WATER TREATMENT SYSTEM

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FIRE TUBE BOILERS

SECTION 23 52 39 - FIRE TUBE BOILERS

PART 1 - GENERAL

1.1 WORK INCLUDED

A. Boilers.

B. Controls and Boiler Trim.

C. Fuel Burning System and Connection.

D. Chimney Connection.

1.2 RELATED WORK

A. Section 23 05 00 - Common Work Results for HVAC.

B. Section 23 09 00 - Instrumentation.

C. Section 23 21 13 - Hydronic Piping.

D. Section 23 21 16 - Hydronic Piping Specialties.

E. Section 23 51 00 - Breechings Chimneys and Stacks.

F. Section 26 05 83 - Wiring Connections.

1.3 REFERENCES

A. AGA - Directory of Certified Appliances and Accessories.

B. ANSI/AGA Z21.13 - Gas-Fired Low-Pressure Steam and Hot Water Boilers.

C. ANSI/AGA Z223.1 - National Fuel Gas Code.

D. ANSI/ASME SEC1 - Boiler and Pressure Vessels Code - Rules for Construction of Power

Boilers.

E. ANSI/ASME SEC4 - Boiler and Pressure Vessels Code - Rules for Construction of Heating

Boilers.

F. ANSI/ASME SEC8D - Boilers and Pressure Vessels Code - Rules for Construction of Pressure

Vessels.

G. ANSI/NFPA 70 - National Electrical Code.

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H. HI (Hydronics Institute) - Testing and Rating Standard for Cast Iron and Steel Heating Boilers.

1.4 SUBMITTALS

A. Submit product data under provisions of Division 01.

B. Submit product data indicating general assembly, components, controls, safety controls, and wiring diagrams, and service connections.

C. Submit manufacturer's installation instructions under provisions of Division 01.

D. Submit manufacturer's field reports under provisions of Division 01.

E. Submit reports indicating condition and operation at start-up.

F. Submit test reports under provisions of Division 01.

G. Submit reports indicating specified performance and efficiency is met or exceeded.

1.5 OPERATION AND MAINTENANCE DATA

A. Submit operation and maintenance data under provisions of Division 01.

B. Include manufacturer's descriptive literature, operating instructions, cleaning procedures, replacement parts list, and maintenance and repair data.

1.6 QUALITY ASSURANCE

A. Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum three years documented experience.

1.7 REGULATORY REQUIREMENTS

A. Conform to ANSI/ASME and ANSI/AGA Z21.13 Code for construction of boilers.

B. Units: UL labeled.

C. Conform to applicable code for internal wiring of factory wired equipment.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver products to site under provisions of Division 01.

B. Store and protect products under provisions of Division 01.

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C. Protect boilers from damage by leaving factory inspection openings and shipping packaging in place until final installation.

1.9 WARRANTY

A. Provide five-year manufacturer's warranty under provisions of Division 01.

1.10 EXTRA MATERIALS

A. Submit maintenance materials under provisions of Division 01.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Lochinvar.

B. Weil-McLain.

C. IBC.

D. Substitutions: Under provisions of Division 01.

2.2 BOILERS

A. The boiler shall bear the ASME "H" stamp for 160 psi working pressure and shall be National

Board listed. The boiler shall have a fully welded, stainless steel, fire tube heat exchanger.

Multiple pressure vessels in a single enclosure are not acceptable. There shall be no banding material, bolts, gaskets or "O" rings in the pressure vessel construction. The heat exchanger shall be designed for a single-pass water flow to limit the water side pressure drop. Pressure drop shall be no greater than 2.2 psi at 75 GPM. The condensate collection basin shall be constructed of welded stainless steel. The complete heat exchanger assembly shall carry a ten (10) year limited warranty.

B. The boiler shall be certified and listed by C.S.A. International under the latest edition of the harmonized ANSI Z21.13 test standard for the U.S. and Canada. The boiler shall comply with the energy efficiency requirements of the latest edition of ASHRAE 90.1 and the minimum efficiency requirements of the latest edition of the AHRI BTS-2000 Standard as defined by the

Department of Energy in 10 CFR Part 431. The boiler shall operate at a minimum of 97%

Combustion and Thermal Efficiency at full fire as registered with AHRI. The boiler shall be certified for indoor installation.

C. The boiler shall be constructed with a heavy gauge steel jacket assembly, primed and pre-painted on both sides. The combustion chamber shall be sealed and completely enclosed, independent of the outer jacket assembly, so that integrity of the outer jacket does not affect a proper seal. A

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burner/flame observation port shall be provided for observing the burner flame and combustion chamber. The burner shall be a premix design constructed of high temperature stainless steel with a woven Fecralloy outer covering to provide smooth operation at all modulating firing rates. The boiler shall be supplied with a negative pressure regulation gas valve and be equipped with a pulse width modulation blower system to precisely control the fuel/air mixture to the burner. The boiler shall operate in a safe condition with gas supply pressures as low as 4 inches of water column.

The burner flame shall be ignited by direct spark ignition with flame monitoring via a flame sensor.

D. The boiler shall utilize a 24 VAC control circuit and components. The control system shall have a factory installed display for boiler set-up, boiler status, and boiler diagnostics. All components shall be easily accessed and serviceable from the front and top of the jacket. The boiler shall be equipped with a temperature/pressure gauge; high limit temperature control with manual reset;

ASME certified pressure relief valve set for 50 psi (standard); outlet water temperature sensor with a dual thermistor to verify accuracy; system supply water temperature sensor; outdoor air sensor, flue temperature sensor with dual thermistor to verify accuracy; low water cut off with manual reset, blocked drain switch and a condensate trap for the heat exchanger condensate drain.

E. The boiler shall be provided factory installed display, password security, outdoor air reset, pump delay with freeze protection, pump exercise, ramp delay featuring six steps, domestic hot water prioritization with limiting capabilities, USB drive for simple uploading of parameters and a PC port connection for connection to a local computer for programming and trending. A secondary operating control that is field mounted outside or inside the appliance is not acceptable. The boiler shall have alarm contacts for any failure, runtime contacts and data logging of runtime at given modulation rates, ignition attempts and ignition failures. The boiler shall have a built-in

“Cascade” with leader redundancy to sequence and rotate while maintaining modulation of up to eight boilers of different Btu inputs without utilization of an external controller. The internal

“Cascade” function shall be capable of lead-lag, efficiency optimization, front-end loading, and rotation of lead boiler every 24 hours. The boiler shall be capable of controlling an isolation valve

(offered by manufacturer) during heating operation and rotation of open valves in standby operation for full flow applications. The control must have optional capability to communicate via Modbus protocol with a minimum of 46 readable points. The boiler shall have an optional gateway device which will allow integration with LON or BacNet protocols.

F. The control shall increase fan speed to boost flame signal when a weak flame signal is detected during normal operation. A 0-10 VDC output signal shall control a variable speed boiler pump

(offered by manufacturer) to keep a fixed Delta T across the boiler regardless of the modulation rate. The boiler shall have the capability to receive a 0-10 VDC input signal from a variable speed system pump to anticipate changes in system heat load in order to prevent flow related issues such as erratic temperature cycling.

G. The boiler shall be equipped with two terminal strips for electrical connection. A low voltage connection board with 46 connection points for safety and operating controls, i.e., Alarm

Contacts, Runtime Contacts, Louver Proving Switch, Tank Thermostat, Domestic Hot Water

Building Recirculation Pump Contacts, Domestic Hot Water Building Recirculation Temperature

Sensor Contacts, Remote Enable/Disable, System Supply Temperature Sensor, Outdoor

Temperature Sensor, Tank Temperature Sensor, Modbus Building Management System Signal and Cascade Control Circuit. A high voltage terminal strip shall be provided for Supply voltage.

Supply voltage shall be 120 volt / 60 hertz / single phase on all models. The high voltage terminal

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strip plus integral relays are provided for independent pump control of the System pump, the

Boiler pump and the Domestic Hot Water pump.

H. Direct Vent system with side wall termination of both the exhaust vent and combustion air. The flue shall be Category IV approved material constructed of CPVC, Polypropylene or Stainless

Steel. A separate pipe shall supply combustion air directly to the boiler from the outside. The boiler’s total combined air intake length shall not exceed 100 equivalent feet. The boiler’s total combined exhaust venting length shall not exceed 100 equivalent feet. The air inlet must terminate on the rooftop with the exhaust.

I. The boiler shall be suitable for use with polypropylene glycol up to a 50% concentration. The de-rate associated with the glycol will vary per glycol manufacturer.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Provide for connection to electrical service. Refer to Section 26 05 83.

C. Provide connection of gas service in accordance with ANSI/AGA Z223.1.

D. Provide side wall ventilation kit per manufacturer guidelines.

E. Pipe relief valves to nearest glycol tank.

3.2 MANUFACTURER'S FIELD SERVICES

A. Prepare and start systems under provisions of Division 01.

B. Provide field representative for starting unit and training operator.

C. Provide combustion test and submit report. Test shall include boiler firing rate, overfire draft, gas flow rate, heat input, burner manifold gas pressure, percent carbon monoxide (CO), percent oxygen (O2), percent excess air, flue gas temperature at outlet, ambient temperature, net stack temperature, percent stack loss, percent combustion efficiency, and heat output.

END OF SECTION 23 52 39