GUIDE SPECIFICATION SECTION235513-1
Revised 16 February 2016Fuel-Fired Duct Heaters
SECTION 235513 - FUEL-FIRED DUCT HEATERS
PART 1 GENERAL
RELATED DOCUMENTS
Contractors, manufacturers, manufacturer representatives, vendors, suppliers, etc. are cautioned that requirements of the Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification sections, apply to work of this section. Sections 230210, 230220, 230240, 230510, 230511, 230533, 230593, 230596, and 230924, must be reviewed for compliance with the requirements of this section.
QUALITY ASSURANCE
Construct and install gasfired duct heaters in accordance with ANSI Z83.9, GasFired Duct Furnaces, or ANSI Z96.1/UL 727, Oil-Fired Central Furnaces, as applicable
NFPA Compliance:
Install oil-fired furnaces in compliance with NFPA 31, Standard for the Installation of Oil Burning Equipment.
Install gasfired furnaces in accordance with the NFPA 54,NationalFuel Gas Code.
Building Code Compliance:
Furnaces, gas- or oil-fired, shall meet or exceed the minimum efficiency rating required by the International Energy Conservation Code when tested, rated, and certified in accordance with DOE 10 CFR Part 430.
SUBMITTALS
General: Submittals shall demonstrate compliance with technical requirements by reference to each subsection of this specification. Where a submitted item does not comply fully with each and every requirement of the Specifications, the submittal shall clearly indicate such deviations. Identification requirements for non-complying features of items are very specific. See Section 230210 for exact requirements.
Manufacturer's Data: Submit manufacturer's technical product data, including rated capacities of selected model clearly indicated, weights, furnished specialties and accessories, and installation and startup instructions.
Wiring Diagrams: Submit manufacturer's electrical requirements for power supply wiring for fuelfired heaters. Submit manufacturer's laddertype wiring diagrams for interlock and control wiring. Clearly differentiate between portions of wiring that are factoryinstalled and portions to be fieldinstalled.
PART 2 PRODUCTS
GASFIRED DUCT HEATERS
Provide gasfired, atmospheric burner type duct heaters as indicated on the Drawings, of type and minimum capacity as scheduled.
Construct casing of galvanized or aluminized steel, with enamel finish. Construct interior casing, to contain air flow, of aluminized steel. Provide removable drain pan, and duct flanges on inlet and outlet of casing. Provide integral inserts for hanger rods.
Construct heat exchanger of welded aluminized or stainless steel. Provide draft diverter or collector box and integral power exhauster as required, of aluminized steel and construct integral to each heat exchanger section. Provide baffle on entering side of heat exchanger to distribute air over full face of heat exchanger. Provide oval or round flue collar.
Construct burner of aluminized steel, and include integral burner crossover. Design burner to be suitable for propane or natural gas.
Provide the following controls, factorypiped and wired to electrical junction box mounted on unit:
2stage gas valve providing 2stage control of 100% to approximately 55% of full unit rating
Electric spark ignition
Safety pilot with 100% shutoff, spark ignited
Pressure regulator with leak limiting device
Manual main and pilot valves
High limit and fan control switches
Control transformer
Provide units that are certified to be in conformance with AGA applicable regulations.
OILFIRED DUCT HEATERS
Provide oilfired duct heaters as indicated, of type and minimum capacity as scheduled, and as specified herein.
Construct casing of galvanized steel with enamel finish. Provide integral inserts for hanger rods. Provide duct flanges on inlet and outlet of casing.
Construct heat exchanger of welded stainless steel for primary surfaces, and aluminized steel for secondary surfaces. Provide flame observation port, CO2 sample port, and clean out and service panels.
Construct oil burner of No.2 fuel oil, flame retention, pressure atomizing, gun type with 2stage, 3450 rpm fuel pump. Provide electric spark ignition and automatic safety system with manual reset.
Provide the following controls, factorypiped, and prewired to electrical junction box mounted on unit:
Cad cell safety system
Manual reset safety
Limit control
Provide units that are Listed.
Provide the following accessories, factorymounted, and wired to electrical junction box:
Oil booster pump, complete with motor and 2stage fuel unit containing pressure regulating valve and strainer
Draft regulator, full size, Listed and Labeled
Oil safety valve
VENTING
Vent each duct heater in compliance with Section 235113, full size of unit connection.
PART 3 EXECUTION
INSTALLATION OF DUCT HEATERS
Install duct heaters as indicated and in accordance with manufacturer's published installation instructions.
Hang units from substrate using threaded rods and building attachments, secure rods to unit hanger attachments in accordance with Section 230529. Adjust hangers so unit is plumb and level.
Connect ductwork to unit inlet and outlet duct collars, use transitions no greater than 15 deg.in any direction for exact fit to collars.
//EDIT THE FOLLOWING PARAGRAPHS BASED ON FUEL USED FOR THIS PROJECT.//
Install gas-fired heaters and associated fuel and vent features and systems according to NFPA54. Connect gas piping to heater, full size of heater gas train inlet, provide union with sufficient clearance for burner removal and service. Extend gas piping to within 5' from unit, provide drop with manual gas shutoff valve, 1/8" NPT plugged test connection, tee, and drip pocket. Locate piping drop so as to not interfere with service of unit. Extend gas piping runout, full size of gas train inlet, from tee to gas train connection, provide union with sufficient clearance for unit removal and service.
Install oil-fired heaters and associated fuel and vent piping according to NFPA31. Connect oil piping to heater, full size of inlet to burner, provide shutoff valve and union with sufficient clearance for burner removal and service. Extend oil piping to within 5' from unit. Provide manifold bleed for pressurized system at high point, provide vent at high point and oil return piping for loop system. Locate oil feeder line so as not to interfere with service of unit. Extend oil piping runout, full size of oil burner inlet, with shutoff valve to oil burner. Provide union with sufficient clearance for unit removal and service.
STARTUP
Startup, test, and adjust fuelfired heaters in accordance with manufacturer's published startup instructions.
Verify proper line and manifold gas pressure.
Check and calibrate controls, adjust burner for maximum efficiency.
OWNER INSTRUCTION AND TRAINING
Provide Owner instruction and training in accordance with Section 230240