Use Case:  Start Air Conditioning

Description:  Start the Air Conditioning in the enclosure
This UC is invoked at the end of the night either manually or as part of the ATS Stop

Role(s)/Actor(s): 
Primary: Operator,Maintenance
Secondary: AC

Priority: Major

Performance: TBD

Frequency: Typically, once per day at end of night.

Package Assignment:  Air Conditioning System.

Preconditions: 

• AC is ONLINE
• Enclosure is closed

  Interface:  IfEnclosure.Control.CloseStatus

• All seals are inflated

  Interface:  IfEnclosure.Seals.SealsInflatedStatus

• Reference Temperature is set (by command or thermal)
• Dew Point Margin is set to 3 degrees
• Dew point < Tair - 3 deg

Basic Course: 

• Send command STRTAC to Air Conditioning
  Exception Course: Command failed
• ATCS sends the start command to the AC sub-system

  Interface:  IfAirConditioning.StartStop

  Exception Course: Command failed
  Postcondition: AC is active
• ATCS returns OK reply

Exception Course: Command failed

• ATCS returns ERROR reply

Postconditions: 

• AC is switched ON
• AC is regulated by Tref

Issues to be Determined or Resolved:  The function Tref = f(ASM prevision data) shall be defined

Notes: See also Periodic Air Conditioning Reference Temperature

Last modified: Tue Oct 29 15:22:35 UTC 2002