Daikin McQuay AGZ-D, Operating And Maintenance Manual, Page: 30 / 82

30 AGZ 025D through 190D OMM 1087
Transitions between these states are shown in the following diagram.
T1 – Off to Preopen

No compressors are running and any compressor on circuit is commanded to start (see unit capacity
control)

T2 – Preopen to Run

5 seconds has passed
T3 – Run to Pumpdown
Any of the following are required:

Last compressor on circuit is commanded to stop

Unit State = Pumpdown

Circuit switch is open

Circuit mode is disable

Circuit Pumpdown alarm is active
T4 – Pumpdown to Off
Any of the following are required:

Evaporator Pressure < Pumpdown Pressure Value

Unit State = Off

Circuit Rapid Stop alarm is active
T5 – Run to Off
Any of the following are required:

Unit State = Off

Circuit Rapid Stop alarm is active

A low ambient start attempt failed
T6 – Preopen to Off
Any of the following are required:

Unit State = Off

Unit State = Pumpdown

Circuit switch is open

Circuit mode is disable

Circuit Rapid Stop alarm is active

Circuit Pumpdown alarm is active