SECTION 15623

FORCED AIR FURNACES

PART 1 GENERAL

SECTION INCLUDES

Forced air furnaces.

Refrigerant cooling coil and condenser.

Humidifier.

Electronic air cleaner.

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: Evaporator [and condenser] fan motors.

Section 15242 - Vibration Isolation.

Section 15290 - Ductwork Insulation: Duct Liner.

Section 15885 - Air Cleaning.

Section 15952 - Controls and Instrumentation: Control components, time clocks.

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

REFERENCES

ANSI/ASHRAE 15 - Safety Code for Mechanical Refrigeration.

ANSI/ASHRAE - 90A - Energy Conservation in New Building Design.

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 207 - Refrigerant - Containing Components and Accessories, Non-Electrical.

ANSI/UL 303 - Refrigeration and Air-Conditioning Condensing, and Air-Source Heat Pump Equipment.

ANSI/UL 727 - Oil-Fired Central Furnaces.

ANSI/UL 729 - Oil-Fired Floor Furnaces.

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

ARI 210/240 - Unitary Air-Conditioning and Air-Source Heat Pump Equipment.

ARI 270 - Sound Rating of Outdoor Unitary Equipment.

ARI 520 - Positive Displacement Refrigerant Compressors, Compressor Units and Condensing Units.

ARI 610 - Central System Humidifiers.

ARI 630 - Selection, Installation and Servicing of Humidifiers.

ASHRAE 14 - Methods of Testing for Rating Positive Displacement Condensing Units.

ASHRAE 52 - Method of Testing Air Cleaning Devices Used in General Ventilation for Removing Particulate Matter.

FS F-F 300A - Filter, Air Conditioning: Viscous Impingement and Dry Types, Cleanable.

FS F-F 310A - Filter, Air Conditioning: Viscous Impingement and Dry Types, Replaceable.

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 shop drawings under provisions of Section [01300.] [_____.]

Submit shop drawings indicating assembly, required clearances, and location and size of field connections.

Product Data: Provide rated capacities, weights, accessories, electrical nameplate data, and wiring diagrams.

Design data: Indicate refrigerant pipe sizing.

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

OPERATION AND MAINTENANCE DATA

Submit operation data under provisions of Section [01700.] [01730.]

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

QUALITY ASSURANCE

Perform Work in accordance with ANSI/ASHRAE 15.

Maintain [one] [_____] copy of [each] document on site.

WARRANTY

Provide [five] [ten] [_____] year warranty under provisions of Section [01700.] [01740.]

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

EXTRA MATERIALS

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

Provide [two] [_____] of each filter under provisions of Section [01700.] [_____.]

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [_____.]

MANUFACTURED :UNITS

Configuration: [Upflow] [Counterflow] [Horizontal] type with [gas burner] [oil burner] [electric heating elements] [and electric refrigeration].

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, humidifier [, electronic air cleaner] [, refrigerant cooling coil and outdoor package containing compressor, condenser coil and condenser fan].

Construction and Ratings: In accordance with ARI 210/240 [, and ANSI/UL 207 and ANSI/UL 303]. Testing: ASHRAE 14.

Performance Ratings: Energy Efficiency Rating (EER) not less than requirements of ANSI/ASHRAE 90A; seasonal efficiency to ANSI/ASHRAE 103.

Heating Capacity: [_____] Btu/hr ([_____] W) rated heating output when heated by [[_____] gph ([_____] L/sec) No. 2 oil] [[_____] Btu/hr ([_____] W/min degrees C) natural gas] [[_____] kW electric heating elements][.] [, seasonal efficiency [_____] percent.] [Gas heating capacities are sea level ratings.]

Air Handling: [_____] cu ft/min ([_____] cu m/sec) at [_____] inch wg ([_____] Pa) external static pressure with [___] hp ([_____] W) motor.

Cooling Capacity: [_____] Btu/hr ([_____] W) rated cooling output with [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB air entering the evaporator, [_____] degrees F ([_____] degrees C) DB condenser ambient air and [_____] kw input. [Unit sound Rating Number based on ARI 270: [_____].]

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

Cooling Capacity: [_____] Btu/hr ([_____] W) rated cooling output with [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB air entering the evaporator, [_____] gpm ([_____] L/s) cooling water entering condenser at [_____] degrees F ([_____] degrees C), and [_____] kw compressor input.

Refer to Furnace Schedule. [Gas heating capacities are sea level ratings.] [Cooling performance is based on ARI 210/240 test conditions.] [Sound Rating Numbers are in accordance with ARI 270.]

FABRICATION

Cabinet: Galvanized steel with baked enamel finish, easily removed and secured access doors, glass fiber or asbestos insulation and reflective liner[.] [and welded steel base.]

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 direct or belt drive[.] [,adjustable variable pitch motor pulley].

Motor: ANSI/NEMA MG 1; 1750 rpm rubber [two-speed] isolated hinge mounted.

Air Filters: [FS F-F-300A;] [FS F-F-310A;] 1 inch (25 mm) thick [urethane, washable] [glass fiber, disposable] type arranged for easy replacement.

BURNER

Oil Burner: [FS VV-F 815C;] High pressure atomizing type, rubber mounted, 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 delay 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 incorporation 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: Thermocouple 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 excessive bonnet temperature and re-energizes when temperature drops to lower safe value.

Control Supply Fan: Bonnet temperatures and independent of burner controls, manual switch for continuous fan operation.

ELECTRIC HEATER

Heater: Helix wound bare nichrome wire heating elements arranged in incremental states of 5 kW each, with porcelain insulators.

ELECTRIC HEATER OPERATING CONTROLS

Low voltage adjustable room thermostat energized heater stages in sequence with pre-determined delay between heating stages to maintain room temperature setting.

High limit temperature control de-energizes heating elements to protect against overheating.

Supply fan starts before electric elements are energized and continues operating after thermostat is satisfied until bonnet temperature reaches minimum setting. Include manual switch for continuous fan operation.

HUMIDIFIER

Type: [ARI 610;] wetted [plate, pan] [drum, power] type with float controlled water supply mounted on furnace return air plenum.

Accessories: Low voltage motor, transformer, bypass duct and damper, and replaceable evaporator media.

Room Humidistat: Electric, adjustable, to energize humidifier when fan operating, to maintain setting.

ELECTRONIC AIR CLEANER

Galvanized steel assembly containing electronic agglomerator, pre-wired rectifying unit including overload protection, on-off switch, and pilot light indicating operating status.

Air Cleaning Efficiency: ASHRAE 52, minimum [_____] percent at [_____] fpm ([_____] m/sec) face velocity.

EVAPORATOR COIL

Coil: Copper tube aluminum fin assembly, galvanized drain pan, drain connection, refrigerant piping connections and factory installed thermostatic expansion valve.

REFRIGERATION PACKAGE

Compressor: [ARI 520;] hermetic, 3600 rpm maximum, resiliently mounted integral with condenser, with positive lubrication, crankcase heater, high pressure control, motor overload protection, service valves and drier.

Air Cooled Condenser: [ARI 520;] aluminum fin and copper tube coil, with direct drive axial propeller fan resiliently

mounted, galvanized fan guard.

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

Water Cooled Condenser: [ARI 520;] co-axial condenser with finned copper inner tube and steel outer shell, factory mounted thermostatic water valve.

REFRIGERATION OPERATING CONTROLS

Room Thermostat: Cycles compressor, condenser fan and supply fan to maintain room temperature setting.

Refrigerant Pressure Switch: Cycles condenser fan on when condenser refrigerant pressure is above 285 psig (1965 kPa) and off when pressure drops below 140 psig (965 kPa).

OPERATING CONTROLS

Adjustable Room Thermostat: Low voltage, to control [burner operation,] [heater stages in sequence with delay between stages,] [compressor and condenser fan] and supply fan to maintain temperature setting. [Include system selector switch (heat-off-cool) and fan control switch (auto-on).]

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

Room thermostat to incorporate:

Automatic switching from heating to cooling.

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

Set-up for four separate temperatures per day.

Instant override of setpoint for continuous or timed period from one hour to 31 days.

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.

Duration of timed override.

Day of week.

System model indication: heating, cooling, auto, off, fan auto, fan on.

State (heating or cooling) operation.

PART 3 EXECUTION

EXAMINATION

Verify that floors are ready for installation of units and openings are as indicated on shop drawings. [Verify that supports for air cooled condensers are completed.]

Verify that proper power supply is available for furnace[.] [and condenser package.]

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 furnaces to ANSI Z223.1 (NFPA 54).

Install oil fired furnaces to ANSI/NFPA 31.

Provide vent connections to ANSI/NFPA 211.

Install humidifiers to ARI 630.

Mount counterflow furnaces installed on combustible floors on additive base.

Mount air cooled condenser-compressor package on [creosote] [preservative] treated 4 inches x 4 inches (83 mm x 83 mm) wood timbers[.] [on vibration isolators.

Refer to Section 15242.]

SCHEDULE

Drawing_Code	FU-1	FU-2	FU-3 FU-4

Manufacturer

Furnace Model

Heating Output

Heating Input

Airflow Capacity

Ext. Static Pressure

Fan Rpm

Motor Size

Cooling Coil Model

Cooling Output

Condenser Model

Sound Rating Number

Cooling Input

END OF SECTION