Jordan_Bunkhouse_158400_-_GAS_FIRED_FURNACE_Rev.1_10_Mar.pdf

GAS FIRED FORCED AIR FURNACE 158400-1

SECTION 158400 – GAS FIRED FORCED AIR FURNACE

Revision 1, 3/8/2017:

Part 2, 2.4.A. Replaced AMEC with ACEC Part 2, 2,4.C.4. Deleted “Permanent split capacitor” Part 2, 2.4.E Added 3 “Thermostat shall be of the same manufacturer as the furnace and shall be designed to work with this furnace.”

Part 2, 2.7.A Replaced ASX16 with ASXC16 Part2, 2.7.B Changed 3.5 tons to 3 tons.

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

A. Work Included: Ductwork, ductwork specialties, propane gas fired furnace and direct vent piping and remote air cooled condensing unit. Remove existing furnace, supply/return ductwork and flue as required for installation of new furnace. Route new vent intake piping through space and up to roof through existing vent stack. Provide vent cap and flashing at chimney termination.

Provide flexible connection at supply outlet, modify existing ductwork as required. Provide start up services and testing of the furnace and condenser.

1.2 QUALITY ASSURANCE

A. Materials and installation shall conform fully with SMACNA.

B. Protect all ductwork and air moving equipment from debris and dust throughout the project until the project environment is dust free.

1.3 SUBMITTALS

A. Submit manufacturer’s product data, installation & maintenance manual and performance data for furnace and condensing unit.

1.4 QUALITY CONTROL

A. Installation for all work shall be in strict accordance with the following standards:

1. NFPA 54, National Fuel Gas Code.

2. NFPA 90 B Standard for the Installation of Warm Air Heating and Air

Conditioning Systems.

3. The International Mechanical Code.

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4. NFPA 70 The National Electrical Code.

B. All equipment shall be certified by the American Gas Association.

PART 2 - PRODUCTS

2.1 SHEET METAL

A. Low pressure sheet metal ducts shall be constructed of standard galvanized steel

(iron) sheets.

B. Galvanized steel ducts shall comply with ASTM A525/ASTM A527, hot-dip process and lock forming quality.

C. Minimum duct metal gauges shall be in conformance with Table 603.4 of the

International Mechanical Code (based on duct dimension), and in no case shall be less than 26 gauge.

2.2 LOW PRESSURE DUCTWORK

A. Materials, construction details, gauges, weights, and thicknesses for ducts, hangers, damper plenums, access doors and turning vanes shall be in accordance with the latest edition of SMACNA “Low Velocity Duct Construction Standards” and as shown or specified on the drawings.

B. Duct Sealant, non-hardening, non-migrating mastic or liquid elastic sealant, type applicable for sealing of ductwork joints and seams.

2.3 FLEXIBLE CONNECTIONS

A. All duct connections to equipment shall be made with UL listed duct connections and shall be Ventglas heavy glass fabric, double coated with neoprene, approximately 30 ounces per square yard, provided with 24 gauge metal mounting strips firmly attached to each edge and suitable for the pressure class of the air handling system.

2.4 GAS FIRED FURNACES

A. Provide high efficiency, induced draft direct vent, propane gas fired furnace with Energy Star rating. Minimum Annual Fuel Utilization Efficiency shall be 95%.

Minimum output capacity rated for propane gas at a site elevation of 2650 feet above sea level. Basis of design Amana AMEC ACEC96 0603BNB, or approved equal by Goodman, Lennox, or Trane.

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B. Unit shall be of the same flow configuration as the existing furnace. Units shall be packaged, factory assembled, pre-wired, consisting of supply fan, dual diameter heat exchanger, filter cabinet, and controls. Furnish conversion kits as necessary for propane use.

C. Fabrication:

1. Cabinet: Constructed of cold rolled steel with baked enamel finish. Unit shall have easily removed and secured access doors. Foil faced insulation around heat exchanger.

2. Heat Exchanger: Corrosion resistant stainless steel.

3. Supply Fan: Direct drive multi-speed statically and dynamically balanced.

4. Motor: Permanent split capacitor, multi-speed, ECM motor. Rubber mounted, 120 volt, 60 hz, single phase.

5. Gas Train and Controls: 2-stage or modulating redundant gas valve, and electronic igniter. Two speed induced draft blower. Units shall have safety shutoff in the event of combustion or ignition failure. A thermostatic or time delay shall regulate blower operation. An integral limit control shall shut off unit if overheating occurs. A differential pressure switch shall prevent operation of unit if there is a blockage in the vent piping.

6. Output: Minimum furnace output shall be 57,000 btu per hour.

E. Room Thermostat:

1. Room Thermostat: Seven day programmable with a minimum of 4 set points per day, battery backup.

2. LCD display with pushbutton or touch screen control.

3. Thermostat shall be of the same manufacturer as the furnace and shall be designed to work with this furnace.

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2.7 CONDENSING UNIT

A. U.L. listed unit shall be factory assembled and pre-wired, consisting of cabinet, compressor, condensing coil and fan. Compressor shall be two speed.

Condensing coil shall be copper with aluminum fins. Propeller type condensing fan shall be direct drive with vertical discharge, housed in a heavy-gauge, louvered, galvanized steel cabinet with baked-on finish and coated wire discharge grille. Unit shall include driers, accumulators, high and low pressure switches, and short cycle protection. Condensing units shall operate on R410A refrigerant.

Units shall be single phase. Manufacturer: Amana ASX16 ASXC16 series, or approved equal.

B. Provide matching evaporator coil for indoor unit. Evaporator coil shall have copper tubes with aluminum fins. Total capacity for system shall be 3.5 3 tons.

Seasonal Energy Efficiency Rating (SEER) shall not be less than 15.0 at the specified capacity with 95 degree outside air temperature. Unit shall be rated in accordance with Air-Conditioning and Refrigeration Institute standards.

2.8 VENT PIPING

A. Provide new PVC vent piping and vent cap in accordance with manufacturer’s recommendations for furnace. Provide Type B double wall for water heater.

PART 3 - EXECUTION

3.1 DUCTWORK INSTALLATION

A. Installation of ducts, hangers, dampers, plenums, access doors and turning vanes shall be in compliance with SMACNA and supplemental requirements herein.

Make elbows either 1-1/2 radius or mitered with double vanes for rectangular ductwork as shown. This applies to exhaust and return air ducts as well as supply ducts, unless otherwise noted. Fabricate transitions with a maximum slope of one-inch-in-seven, except that a one-inch-in-four slope is acceptable where the duct area decreases in direction of flow. Duct sizes shown on the drawings are the free area size.

B. Close corners of cross joints. Do not use cross braking in lieu of other types of reinforcing. Flat areas over 18 inches wide shall be stiffened by cross bracing unless duct will have thermal insulation or sound-absorbing lining.

C. Install flexible connections to prevent vibration transmission between fans or units and metal ducts or casings.

D. Duct offsets shall be made with 15-degree transitions. Sharper transitions will be

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permitted only when space does not allow for 15-degree offsets. In any case, no offset shall be greater than 30 degrees.

E. All low pressure duct shall have a Class B seal in accordance with SMACNA, with all transverse joints and fitting connections sealed. Snaplock seams sealed.

Tape all transverse joints with lagging adhesive.

3.2 FURNACE INSTALLATION

A. Install furnaces in strict accordance with manufacturer's recommendations.

B. Provide vent connections to meet ANSI/NFPA 211. Install / revise venting in accordance with the manufacturers printed instructions.

C. Insulate refrigerant suction line with closed cell elastomeric foam insulation per manufacturer's recommendations.

3.3 START-UP

A. Check gas input, adjust manifold pressure, and make all safety checks per manufacturer's instructions.

END OF SECTION 158400