 Nov 4 - regular class  Electrical text  Openings text  Nov 6 – no class  Nov 11 – no class – Veteran’s Day  Be sure to hug a Veteran (women only)

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Presentation transcript:

 Nov 4 - regular class  Electrical text  Openings text  Nov 6 – no class  Nov 11 – no class – Veteran’s Day  Be sure to hug a Veteran (women only)  By a Veteran a beer (men only)  Nov 13 - regular class  HW #9 – Electrical  HW #10 – Openings  Presentations: Bahrain, Iran, Libya

 Determine the HVAC components needed for the residence in figure the furnace includes an air conditioner. A 2” x 12” register is required at each of the base cabinets and a 6” x 18” grille is needed at the beginning of each return air. The distance from the top of the furnace to the rood is 22 feet. The vent pipe is 4 inches in diameter.

 The equipment needed is a furnace, and air conditioning coil, and an air conditioning compressor. A plenum will be needed between the furnace and the supply trunk line.  For the supply trunk line:  16 feet of 8” x 12” rectangular duct  two 8” x 12” to 8” x 8” transitions  16 feet of 8” x 8” square duct  two 8” x 8” end caps will be needed

 For the individual supply lines, the following items are needed:  nine 90-degree 6-inch elbows to connect the trunk to the line  85 feet (15’+15’+15’+3’+7’+6’+6’+9’+9’) of 6” diameter duct  three 90-degree 6-inch elbows to connect to the base cabinets  three 2” x 12” registers  six 4” x 12” boots  six 4” x 12” registers.

 The following items are needed for the return air:  two 6” x 18” grills  9 feet (1’+1’+1’+1’+4’+1’) of 18-inch- wide sheet metal to create return air chases between the joists  two 8” x 12” end caps  14 feet of 8”x 12” end caps  4 feet of 8” x 12” duct  8 feet of 12” x 18” duct to run from the trunk line to the bottom of the furnace.

 The venting needs to run from the furnace to a point at least 2 feet above the rood.  Four feet of pipe is allowed for the vent to enter the chase. The pipe in the chase will need to be double walled.  For the venting, the following items are needed:  two 90-degree 4-inch single-wall elbows  4 feet of 4-inch diameter single-wall pipe  24 feet of 4-inch diameter double-wall pipe  one 4-inch roof flashing  one 4-inch termination cap.

 Other items needed for the furnace include:  one box of line set to connect the condenser to the coil  one thermostat  one roll of low voltage wiring.  Additionally, the electrician will need to provide power and a switch at the furnace and a fuel line will need to be provided from the fuel source.

ProbDescriptionCalculations Number of units Leng th Total Units Cost per unit Matarial Cost Labor per LF Labor Cost Total Cost 14-1Supply Duct 8x12 duct116ft $46.75 $4.30$ x12 to 8x8 transitions21ft2$8.00$16.00$4.30$8.60 8x8 duct116ft $30.98 $2.39$ x8 end cap21ft2$8.00 $2.39$4.78 6x6 duct487ft $26.88$107.52$1.54$ in x 90 elbow-supply61ft6$11.50$69.00$1.54$9.24 6in x 90 elbow- cabinets31ft3$11.50$34.50$1.54$4.62 2x12 register-cabinets31ft3$6.78$20.34$4.30$ x12 register-supply61ft6$8.37$50.22$4.30$ x12 register boot61ft6$8.37$50.22$4.30$25.90 Return Duct Total$433.53Total$332.96

Return Duct Total$433.53Total$ x12 return duct114ft $46.75 $4.30$ x18 return air grilles21ft2$9.42$18.84$4.30$ " sheet metal for return plenum19ft $0.40$3.60$4.30$ x12 end caps21ft2$0.40$0.80$ x18 duct-to furnace18ft $4.00 $10.51$ " vent pipe to return11ft1$7.58 $1.27 4" vent pipe to roof (22+2)124ft $24.25 $1.27$ " 90 elbows21ft2$8.35$16.70$1.27$2.54 4" roof flashing11ft1$8.35 $1.27 4" vent cap11ft1$8.35 $1.27 Heat Pump Unit Total$139.22Total$232.71

Heat Pump Unit Total$139.22Total$ ton heat pump11$1, $1, thermostat11$30.00 power line1 1$ Total$1,560.00Total$1,960.00

Total material$2, % sales tax$ Total material including tax $2, Total Labor$2, % fringe benefits$ Total Labor $3, Total material and labor$5, % and 8% overhead$ Total cost of HVAC insulation $6,303.58

4in x 25ft $24.25 per unit $6.78 each $13.12 vent cap

Total material $3, Add 6% sales tax on materials $ Total material $3, Labor to install components $3, Add 22% fringe benefits $ Total labor cost $3, Sub-total labor & materials $7, Add 10% profit & 8% OH $1, Total cost for HVAC installation $8,941.42