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  #1  
26th May 2015, 04:24 PM
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VAV RTU Sequence Of Operation

Can you please forward me the guide of RTU sequence of operations for HVAC controls of the Variable air volume (VAV)? I am doing the course of the HVAC so I have to understand the RTU sequence of operations for the VAV and other HVAC equipment?
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  #2  
26th December 2015, 10:18 AM
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Re: VAV RTU Sequence Of Operation

hii sir, I received an Assignment of the topic sequence of operations for HVAC controls will you please help me to complete this assignment ?
  #3  
26th December 2015, 10:22 AM
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Join Date: Apr 2013
Re: VAV RTU Sequence Of Operation

As you asking for the sequence of operations for HVAC controls

DEFINITIONS
A. DDC: Direct digital control.
B. VAV: Variable air volume.


RTU SEQUENCE OF OPERATIONS:

A. General: Provide factory mounted and wired microprocessor based controls, interfaced with the Building Automation System (BAS).
Provide any field supplied devices to complete this sequence of operation. Install any RTU manufacture supplied devices to complete this sequence of operation. Coordinate with Section 15782 for RTU manufacturer supplied devices.
The BAS will determine Occupied/Unoccupied mode for the rooftop unit from Owner defined schedule.

B. Unoccupied Mode: Unit fans, heat, and refrigeration will be de-energized, and the outside air damper will be closed. When at least 3 zones associated with a particular unit fall outside of the unoccupied mode temperature range (60°F to 85°F-adjustable), the unit fan will be energized and controlled as described below. The unit outside air damper shall remain closed and exhaust fan shall remain de-energized, unless cooling is called for and economizer operation is available. The unit shall be de-energized once all zones are within the unoccupied mode temperature range.

Unoccupied Heating Mode: If the zone temperatures are below the unoccupied mode
range, all zone air terminals’ control sequence shall be changed to reverse acting (see
below), and the unit discharge air temperature will be controlled to 95°F (adjustable) by
modulating the gas furnace.
2. Unoccupied Cooling Mode: If the zone temperatures are above the range, the unit
discharge air temperature will be controlled to 55°F (adjustable) by staging on DX cooling

rest of the complete details of the sequences of operations of HVAC controls
you may find in the below attachments that is free to download


Sequence of operations of the HVAC control










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