Daikin MICROTECH III Operating Manual page 13

Unit power up
Circuit is in Off state
Is circuit is enabled to
start?
Yes
Are compressor cycle
timers active?
No
Is compressor oil sump
ready?
Yes
Circuit is ready to start
Is circuit commanded to
start?
Yes
Run circuit
Is circuit commanded to
shut down?
Yes
Pumpdown circuit
13/77
Figure 6, Circuit Sequence of Operation
AWS Sequence of Operation - Circuits
When the circuit is in the Off state the EXV is closed, compressor is off, and all fans
are off.
No
The circuit must be enabled before it can run. It may be disabled for several
reasons. When the circuit switch is off, the status will be Off:Circuit Switch.
If the BAS has disabled the circuit, the status will be Off:BAS Disable. If the circuit
has an active stop alarm then the status will be Off:Cir Alarm. If the circuit has
Yes been disabled via the circuit mode set point, the status will be Off:Cir Mode
Disable.
No
A minimum time must pass between the previous start and stop of a compressor
and the next start. If this time has not passed, a cycle timer will be active and the
circuit status will be Off:Cycle Timer.
If the compressor is not ready due to refrigerant in the oil, the circuit cannot start.
The circuit status will be Off:Refr In Oil.
If the compressor is ready to start when needed, the circuit status will be
Off:Ready.
No
When the circuit begins to run, the compressor will be started and the EXV, fans,
and other devices will be controlled as needed. The normal circuit status at this
time will be Run.
No
When the circuit is commanded to shut down, a normal shut down of the circuit will
be performed. The circuit status during this time will be Run:Pumpdown. After
the shut down is completed, the circuit status will normally be Off:Cycle Timer
initially.
Operation Manual D–EOMWC00A07-16_02EN