Daikin AGZ 190D, Operating & Maintenance Manual

Page: 23 / 84

OMM 1166-1 AGZ 025D through 190D 23
T1 - Off to Auto
All of the following are required:

Unit Enable = On

No Unit Alarm

A circuit is enabled to start

If Unit Mode = Ice then Ice Delay not active
T2 - Auto to Pumpdown
Any of the following are required:

Unit Enable = Off and Unit Switch is closed

Unit Mode = Ice AND LWT target is reached

Unit Pumpdown Alarm active
T3 - Pumpdown to Off
Any of the following are required:

Unit rapid stop alarm active

All circuits complete pumpdown

Unit Switch open
T4 - Auto to Off
Any of the following are required:

Unit rapid stop alarm active

No circuit enabled and no compressors running

Unit Switch open
Power Up Start Delay
After powering up the unit, the motor protectors
may not be engaged for up to 150 seconds.
Therefore, after the control is powered up, no
compressor can start for 150 seconds. In addition,
the motor protect inputs are ignored during this
time so as to avoid tripping a false alarm.
Ice Mode Start Delay
An adjustable start to start ice delay timer will
limit the frequency with which the chiller may
start in Ice mode. The timer starts when the first
compressor starts while the unit is in ice mode.
While this timer is active, the chiller cannot restart
in Ice mode. The time delay is adjustable via the
Ice Time Delay set point.
The ice delay timer may be manually cleared to
force a restart in ice mode. A set point specifically
for clearing the ice mode delay is available. In
addition, cycling the power to the controller
should clear the ice delay timer.
Unit Status
The displayed unit status should be determined by the conditions in the following table:
Enum Status Conditions
0 Auto Unit State = Auto
1 Motor Prot Delay Unit State = Auto and MP start up delay is active
2 Off:Ice Mode Timer Unit State = Off, Unit Mode = Ice, and Ice Delay = Active
3 Off:OAT Lockout Unit State = Off and Low OAT Lockout is active
4 Off:All Cir Disabled Unit State = Off and both circuits unavailable
5 Off:Unit Alarm Unit State = Off and Unit Alarm active
Continued next page.