IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS 54 www.DaikinApplied.com
seqUenCe of operaTIon
seqUenCe of operaTIon
Figure 47: Unit Sequence of Operation - Cool Mode
Is unit enabled?
Is ow present?
Evaporator pump output on
Yes
Yes
No
Wait for chilled water loop to
recirculate
Unit power up
No
Unit in O state
The chiller may be disabled via the unit switch, the remote switch, the keypad
enable setting, or the BAS network. In addition, the chiller will be disabled if all
circuits are disabled, or if there is a unit alarm. If the chiller is disabled, the unit
status display will reect this and also show why it is disabled.
If the chiller is enabled, then the unit will be in the Auto state and the evaporator
water pump output will be activated.
If the unit switch is o, the unit status will be O:Unit Switch. If the chiller is
disabled due to network command, the unit status will be O:BAS Disable. When
the remote switch is open, the unit status will be O:Remote Switch. When a unit
alarm is active, the unit status will be O:Unit Alarm. In cases where no circuits
are enabled, the unit status will be O:All Cir Disabled. If the unit is disabled via
the Chiller Enable set point, the unit status will be O:Keypad Disable.
Yes
No
Is low ambient lockout
active?
After establishing ow, the chiller will wait some time to allow the chilled water
loop to recirculate for an accurate reading of the leaving water temperature.
The unit status during this time is Auto:Evap Recirculate.
The chiller will then wait for the ow switch to close, during which time the unit
status will be Auto:Wait for ow.
Low ambient lockout will prevent the chiller from starting even if it is otherwise
enabled. When this lockout is disabling the chiller, the unit status will be O:Low
OAT Lock.
Pump output remains on
while chiller is enabled
No
If the chiller is waiting on the motor protection delay after powering up, the unit
status will be O: Motor Protection Delay.
Is Motor Protection
delay active?
Yes
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