SECTION 15625

FUEL FIRED UNIT HEATERS

PART 1 GENERAL

SECTION INCLUDES

Gas fired unit heaters.

Oil fired unit heaters.

Gas fired industrial heaters.

Oil fired industrial heaters.

Gas fired duct furnaces.

Oil fired duct furnaces.

Fuel fired packaged air units.

Infrared heaters.

Tubular infrared heaters.

Controls.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15952 - Controls and Instrumentation: Installation of thermostats and other controls components.

Section 16180 - Equipment Wiring Systems: Installation and wiring of thermostats and other controls components.

RELATED SECTIONS

Section 15170 - Motors: Fan motors.

Section 15242 - Vibration Isolation.

Section 15290 - Ductwork Insulation: Duct Liner.

Section 15575 - Breeching, Chimneys, and Stacks.

Section 15973 - Pneumatic Control Systems: Control components, time clocks.

Section 16180 - Equipment Wiring Systems: Electrical supply to units.

REFERENCES

ANSI/ASHRAE 103 - Heating Seasonal Efficiency of Central Furnaces and Boilers, Methods of Testing.

ANSI/NEMA MG 1 - Motors and Generators.

ANSI/NFPA 31 - Installation of Oil Burning Equipment.

ANSI/NFPA 90B - Installation of Warm Air Heating and Air Conditioning Systems.

ANSI/NFPA 211 - Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances.

ANSI/UL 727 - Oil-Fired Central Furnaces.

ANSI/UL 729 - Oil-Fired Floor Furnaces.

ANSI/Z223.1 (NFPA 54) - National Fuel Gas Code.

FS VV-F 815C - Fuel Oil, Burner.

MIL-F-17104E - Furnaces, Warm Air and Heaters, Unit Forced Air Circulation, Oil- and Gas-Fired.

NFPA 90A - Installation of Air Conditioning and Ventilating Systems.

SUBMITTALS

Submit under provisions of Section [01300] [_____].

Shop Drawings: Indicate assembly, required clearances, and location and size of field connections.

Product Data: Provide manufacturer's literature and data indicating rated capacities, weights, accessories, electrical nameplate data, and wiring diagrams.

Manufacturer's Installation Instructions: Indicate rigging, assembly, and installation instructions.

OPERATION AND MAINTENANCE DATA

Submit operation data under provisions of Section [01700] [_____].

Include manufacturer's descriptive literature, operating instructions, maintenance and repair data, and parts listing.

WARRANTY

Provide [five] [_____] year warranty under provisions of Section [01700] [_______].

Warranty: Include coverage for [heat exchangers][_____].

EXTRA MATERIALS

Submit maintenance materials under provisions of Section [01700] [________].

Provide [two] [_____] of each [filter] [ceramic module] [________] under provisions of Section [01700] [______].

PART 2 PRODUCTS

UNIT HEATERS

Manufacturers:

[___________________________________].

[___________________________________].

[___________________________________].

Units: [MIl-F-17104E;] Self-contained, packaged, factory assembled, pre-wired unit consisting of cabinet, supply fan, heat exchanger, burner or heater, controls [,air filter].

Performance Ratings:	Seasonal efficiency to ANSI/ASHRAE 103.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by [[_____] Btu/hr ([_____] W/min) natural gas] [[_____] gph ([_____] L/sec) No. 2 oil] [,seasonal efficiency [_____] percent.] [Gas heating capacity is sea level rating.]

Air Handling:

Fan:	[_____] cu ft/min ([_____] L/sec) [at [_____] inch wg ([_____] pa) external static pressure]

Motor: ANSI/NEMA MG 1; 1750 rpm [two-speed] [rubber isolated hinge mounted]; [_____] hp, [_____] volt, [single][three] phase, 60 Hz.

Model:	[___________] manufactured by [_________________].

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Cabinet:	Galvanized steel with baked enamel finish, easily removed and secured access doors, glass fiber insulation and reflective liner.

Heat Exchanger: [Aluminized] [Stainless Steel] welded construction.

Combustion Chamber: [ANSI/UL 727;] [ANSI/UL 729;] [welded stainless steel] [precast refractory].

Supply Fan: [Propeller] [Centrifugal forward curved] type with [direct] [belt] drive [, variable pitch motor pulley].

Burner:

Oil Burner: [FS VV-F-815C;]	High pressure atomizing type, adjustable combustion air blower, fuel pump, hinged flame inspection port, cadmium sulphide flame sensor, electrodes, ignition transformer, oil nozzle, and barometric draft regulator in flue.

Oil Burner Safety Controls: Thermostat energizes burner motor and electric ignition. Time delay relay limits time for establishment of main flame. Flame sensor monitors flame continuously during burner operation and stops burner on flame failure with manual reset. Solenoid operated oil valve opens after burner motor is energized and closes instantly when burner motor is de-energized.

****** [OR] ******

Gas Burner: Atmospheric type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, [electronic pilot ignition, automatic vent damper,] and draft diverter.

Gas Burner Safety Controls: Thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Burner Operating Controls:

Room thermostat:	Cycles burner to maintain room temperature setting.

High Limit Control: Fixed stop at maximum permissible setting, de-energizes burner on high bonnet temperature and re-energizes when temperature drops to lower value.

Fan Control:	Bonnet thermostat independent of burner controls, cycles supply fan, with manual switch for continuous fan operation.

Operating Controls:

Room Thermostat:	Low voltage, to control [burner operation,] [heater stages,] to maintain temperature setting. [Include fan control switch (auto-on).]

****** [OR] ******

Electronic solid state microcomputer based room thermostat [with remote sensor]: Locate [as indicated] [____________].

Room thermostat to incorporate:

Preferential rate control to minimize overshoot and deviation from set point.

Set-up for four separate temperatures per day.

Short cycle protection.

Programming based on weekdays, Saturday and Sunday.

Switch selection features including imperial or

metric display, 12 or 24 hour clock, keyboard disable, remote sensor, fan on-auto.

Room thermostat display to include:

Time of day.

Actual room temperature.

Programmed temperature.

Programmed time.

Day of week.

System mode indication: heating on/off, fan auto/on.

Accessories:

Discharge Louvers: Individually adjustable horizontal [and vertical] louvers to match cabinet finish.

Downturn Nozzle:	[30] [60] degree nozzle to match outlet and cabinet finish.

Poly-Tube Outlet Adapter: Transition duct to adapt from unit outlet to round outlet flange for polyethylene tube duct.

INDUSTRIAL HEATERS

Manufacturers:

[___________________________________].

[___________________________________].

[___________________________________].

Units: [MIl-F-17104E;] Self-contained, packaged, factory assembled, pre-wired unit consisting of cabinet, supply fan, heat exchanger, burner or heater, controls [,air filter].

Performance Ratings:	Seasonal efficiency to ANSI/ASHRAE 103.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by [[_____] Btu/hr ([_____] W/min) natural gas] [[_____] gph ([_____] L/sec) No. 2 oil] [,seasonal efficiency [_____] percent.] [Gas heating capacity is sea level rating.]

Air Handling:

Fan:	[_____] cu ft/min ([_____] cu m/sec) [at [_____] inch wg ([_____] pa) external static pressure].

Motor: ANSI/NEMA MG 1; 1750 rpm [two-speed] [rubber isolated hinge mounted]; [_____] hp, [_____] volt, [single][three] phase, 60 Hz.

Model:	[_____] manufactured by [_________________].

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Cabinet:	Galvanized steel with baked enamel finish, easily removed and secured access doors, glass fiber insulation and reflective liner.

Heat Exchanger: [Aluminized] [Stainless] steel welded construction.

Combustion Chamber: [ANSI/UL 727;] [ANSI/UL 729;] [welded stainless steel.] [precast refractory.]

Supply Fan: Centrifugal type with belt drive, variable pitch motor pulley.

Filter: Easily removed one inch (25 mm) thick [glass fiber throwaway] [permanent washable] type, located to filter air before fan.

Mixing:

Dampers:	Outside and return dampers with damper operator and control package to automatically vary outside air quantity. Outside air damper shall fall to closed position.

Gaskets:	Tight fitting dampers with edge gaskets [,maximum leakage 5 percent at 2 inches (500 Pa) pressure differential].

Damper Operator:	[24 volt with gear train sealed in oil.] [Pneumatic piston or gear driven type with spring return.]

****** [OR] ******

Mixed Air Control Sequence: Maintain selected supply air temperature and return dampers to minimum position on call for heating.

Burner:

Oil Burner: [FS VV-F-815C;]	High pressure atomizing type, adjustable combustion air blower, fuel pump, hinged flame inspection port, cadmium sulphide flame sensor, electrodes, ignition transformer, oil nozzle, and barometric draft regulator in flue.

Oil Burner Safety Controls: Thermostat energizes burner motor and electric ignition. Time delay relay limits time for establishment of main flame. Flame sensor monitors flame continuously during burner operation and stops burner on flame failure with manual reset. Solenoid operated oil valve opens after burner motor is energized and closes instantly when burner motor is de-energized.

****** [OR] ******

Gas Burner: Atmospheric type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, [electronic pilot ignition, automatic vent damper,] and draft diverter.

Gas Burner Safety Controls: Thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Burner Operating Controls:

Room thermostat:	Cycles burner to maintain room temperature setting.

High Limit Control: Fixed stop at maximum permissible setting, de-energizes burner on high bonnet temperature and re-energizes when temperature drops to lower value.

Fan Control:	Bonnet thermostat and independent of burner controls, cycles supply fan, with manual switch for continuous fan operation.

Room Thermostat:	Low voltage, to control [burner operation] [heater stages in sequence with delay fan to maintain temperature setting]. [Include fan control switch (auto-on).]

DUCT FURNACES

Manufacturers:

[___________________________________].

[___________________________________].

[___________________________________].

Units: [MIl-F-17104E;] Self-contained, packaged, factory assembled, pre-wired unit consisting of cabinet, heat exchanger, burner or heater, controls [,air filter].

Performance Ratings:	Seasonal efficiency to ANSI/ASHRAE 103.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by [[_____] Btu/hr ([_____] W/min) natural gas] [[_____] gph ([_____] L/sec) No. 2 oil] [,seasonal efficiency [_____] percent.] [Gas heating capacity is sea level rating.]

Model:	[___________] manufactured by [_________________].

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Cabinet:	Galvanized steel with baked enamel finish, easily removed and secured access doors, glass fiber insulation and reflective liner.

Heat Exchanger: [Aluminized] [Stainless] steel welded construction.

Combustion Chamber: [ANSI/UL 727;] [ANSI/UL 729;] [welded stainless steel] [precast refractory].

Burner:

Oil Burner: [FS VV-F-815C;]	High pressure atomizing type, adjustable combustion air blower, fuel pump, hinged flame inspection port, cadmium sulphide flame sensor, electrodes, ignition transformer, oil nozzle, and barometric draft regulator in flue.

Oil Burner Safety Controls: Thermostat energizes burner motor and electric ignition. Time delay relay limits time for establishment of main flame. Flame sensor monitors flame continuously during burner operation and stops burner on flame failure with manual reset. Solenoid operated oil valve opens after burner motor is energized and closes instantly when burner motor is de-energized.

****** [OR] ******

Gas Burner: Atmospheric type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, [electronic pilot ignition, automatic vent damper,] and draft diverter.

Gas Burner Safety Controls: Thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Burner Operating Controls:

Room thermostat:	Cycles burner to maintain room temperature setting.

High Limit Control: Fixed stop at maximum permissible setting, de-energizes burner on high bonnet temperature and re-energizes when temperature drops to lower value.

Room Thermostat:	Low voltage, to control [burner operation] [heater stages in sequence with delay fan to maintain temperature setting].

INFRARED HEATERS

Manufacturers:

[___________________________________]

[___________________________________]

[___________________________________]

Units: Self-contained, packaged, factory assembled, pre-wired unit consisting of cabinet, heat exchanger, burner, reflector, controls.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by natural gas. [Gas heating capacity is sea level rating.]

Model:	[_____] manufactured by [___________________].

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Cabinet: Galvanized steel with baked enamel finish.

Ceramic Emitter:	Assembly of high temperature ceramic tiles with stainless steel housing and reflector.

Gas Burner: Atmospheric type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, electronic pilot ignition.

Gas Burner Safety Controls: Thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Room Thermostat: Low voltage, to control burner operation.

TUBULAR INFRARED HEATERS

Manufacturers:

[___________________________________]

[___________________________________]

[___________________________________]

Units: Packaged, [partially] factory assembled, pre-wired unit consisting of cabinet, burner, heat exchanger, radiant tube, reflector, controls.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by natural gas. [Gas heating capacity is sea level rating.]

Model:	[_____] manufactured by [___________________].

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Cabinet: Galvanized steel with baked enamel finish.

Heat Exchanger: Aluminized steel combustion chamber with [aluminized] steel tube with aluminum reflector.

Gas Burner: [Forced draft] [Induced draft] type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, electronic pilot ignition.

Gas Burner Safety Controls: Thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Room Thermostat: Low voltage, to control burner operation.

FUEL FIRED PACKAGED AIR UNITS

Manufacturers:

[___________________________________]

[___________________________________]

[___________________________________]

Units: [MIl-F-17104E;] Self-contained, packaged, factory assembled, pre-wired unit consisting of cabinet and supply fan assembly, and duct furnaces each consisting of heat exchanger and burner, controls [, air filter].

Performance Ratings:	Seasonal efficiency to ANSI/ASHRAE 103.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by [[_____] Btu/hr ([_____] W/min) natural gas] [[_____] gph ([_____] L/sec) No. 2 oil] [,seasonal efficiency [_____] percent.] [Gas heating capacity is sea level rating.]

Air Handling:

Fan:	[_____] cu ft/min ([_____] cu m/sec) [at [_____] inch wg ([_____] pa) external static pressure]

Motor: ANSI/NEMA MG 1; 1750 rpm [two-speed] [rubber isolated hinge mounted]; [_____] hp, [_____] volt, [single][three] phase, 60 Hz.

Refer to Schedule. [Gas heating capacities are sea level ratings.]

Model:	[______] manufactured by [_____________________].

Cabinet:	Galvanized steel with baked enamel finish, easily removed and secured access doors, glass fiber insulation (refer to Section 15290) and reflective liner.

Heat Exchanger: [Aluminized] [Stainless] steel welded construction.

Combustion Chamber: [ANSI/UL 727;] [ANSI/UL 729;] [welded stainless steel.] [precast refractory.]

Supply Fan: Centrifugal type rubber mounted with belt drive, variable pitch motor pulley.

Filter: Easily removed one inch (25 mm) thick [glass fiber throwaway] [permanent washable] type, located to filter air before fan.

Mixing Dampers:

Dampers:	Outside and return dampers with damper operator and control package to automatically vary outside air quantity. Outside air damper shall fall to closed position.

Gaskets:	Tight fitting dampers with edge gaskets [,maximum leakage 5 percent at 2 inches (500 Pa) pressure differential].

Damper Operator:	[24 volt with gear train sealed in oil.] [Pneumatic piston or gear driven type with spring return.]

Mixed Air Control Sequence: Maintain selected supply air temperature and return dampers to minimum position on call for heating.

Burner:

Oil Burner: [FS VV-F 815C;]	High pressure atomizing type, adjustable combustion air blower, fuel pump, hinged flame inspection port, cadmium sulphide flame sensor, electrodes, ignition transformer, oil nozzle, and barometric draft regulator in flue.

Oil Burner Safety Controls: Thermostat energizes burner motor and electric ignition. Time delay relay limits time for establishment of main flame. Flame sensor monitors flame continuously during burner operation and stops burner on flame failure with manual reset. Solenoid operated oil valve opens after burner motor is energized and closes instantly when burner motor is de-energized.

****** [OR] ******

Gas Burner: Atmospheric type with adjustable combustion air supply, combination gas valve and pressure regulator incorporating manual shut-off, pilot valve, automatic 100 percent shut-off and thermo-couple pilot safety device, [electronic pilot ignition, automatic vent damper,] and draft diverter.

Gas Burner Safety Controls: thermo-couple sensor prevents opening of solenoid gas valve until pilot flame is proven and stops gas flow on ignition failure.

Burner Operating Controls:

Room thermostat:	Cycles burner to maintain room temperature setting.

High Limit Control: Fixed stop at maximum permissible setting, de-energizes burner on high bonnet temperature and re-energizes when temperature drops to lower value.

Fan Control:	Bonnet thermostat independent of burner controls, cycles supply fan, with manual switch for continuous fan operation.

Operating Controls:

Room Thermostat:	Low voltage, to control [burner operation,] [heater stages in sequence with delay fan to maintain temperature setting. [Include fan control switch (auto-on).]

****** [OR] ******

Electronic solid state microcomputer based room thermostat [with remote sensor]; locate [as indicated] [____________].

Room thermostat to incorporate:

Preferential rate control to minimize overshoot and deviation from set point.

Set-up for four separate temperatures per day.

Short cycle protection.

Programming based on weekdays, Saturday and Sunday.

Switch selection features including imperial or metric display, 12 or 24 hour clock, keyboard disable, remote sensor, fan on-auto.

Room thermostat display to include:

Time of day.

Actual room temperature.

Programmed temperature.

Programmed time.

Day of week.

System mode indication: heating on/off, fan auto, fan on.

PART 3 EXECUTION

EXAMINATION

Verify that space is ready for installation of units and openings are as indicated on shop drawings.

Verify that proper power supply is available.

Verify that proper fuel supply is available for connection.

INSTALLATION

Install in accordance with manufacturer's instructions.

Install to [NFPA 90A] [and] [ANSI/NFPA 90B].

Install gas fired units to ANSI Z223.1 (NFPA 54).

Install oil fired units to ANSI/NFPA 31.

Provide vent connections to ANSI/NFPA 211 [Refer to Section 15575].

Install [unit heaters] [packaged air units] with vibration isolation. [Refer to Section 15242]

Install thermostats in accordance with [Section 15973] [Section 16180].

SCHEDULE

Drawing_Code	GH-1	OH-1	IH-3	PAU-4

Manufacturer

Model

Heating Output

Fuel Input

Air Flow Capacity

Static Pressure

Fan Rpm

Motor Size

Motor, Volt/Phase/Cycles

END OF SECTION