Daikin AGZ055E - Unit Sequence of Operation - Ice Mode

seqUenCe of operaTIon
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MODEL AGZ CHILLERS
Figure 50: Unit Sequence of Operation - Ice Mode
Is unit enabled?
Is ow present?
Yes
Yes
No
Evaporator pump output on
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 reect 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.
Yes
No
Is low ambient lockout
active?
The chiller will then wait for the ow switch to close, during which time the unit
status will be Auto:Wait for ow.
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 Ice Mode Start Delay
expired?
Wait for chilled water loop to
recirculate.
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.
A delay is required between Ice cycles.
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 Recirc.