11/22/2017
Standard Packaging Unit
Variable Air Volume (VAV) Box
• Part of the HVAC system • Allows control of individual room temperatures • Air blower flow rate is variable • VAV is usually connected to:
• Simple HVAC unit • Consists of the following: ▫ Air Compressor ▫ Heating Coil ▫ Filter ▫ One main duct • Thermostat wired to unit
▫ Local control system ▫ Central control system
• Variations to system
▫ Fan powered VAV box
Rooftop Unit
Liebert® Unit
• Usually sits on roof • Similar to Standard Package • Chiller used in place of compressor • Typically used in: ▫ Retail buildings ▫ Commercial buildings • Multiple units used if large facility
• Manufacturer of computer room air conditioning systems • (CRAC) • Targeted to the mainframe computer data – processing market • First self-contained units • Capable of maintaining with precision tolerances ▫ Ideal for large computers
Pricing Methods
Div.
H.V.A.C components
Unit
Ductwork
lbs
Outdoor/Indoor Air Handling Unit
AHU Customer AHU
Cfm/Tonage Cfm/Tonage
• Independent unit from original structure • Weight average of 1000lb per sq ft • Usually has the following: ▫ Hot water connection for heating ▫ Cold water connection for chill water • Additions to AHUs
Heating Boilers
Ea
Primary and Secondary Pump
Ea
DDC Control
SF
VAVBoxes Linear Diffusers Supply Diffusers Resture Diffusers Piping Hot water Copper Natural Gas Cold water Copper
Ea Ea Ea Ea
15500
LF LF LF
▫ 2 pipe system ▫ 4 pipe system
Liebert® Unit
Allowance
25
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