Daikin AWV024 - Unit Control States; Unit Status; Unit Status Conditions

IOM 1242-2 • PATHFINDER
®
MODEL AWV CHILLERS 52 www.DaikinApplied.com
unIT funCTIons
Unit Control States
The unit will always be in one of three states:
1. Off – Unit is not enabled to run.
2. Auto – Unit is enabled to run.
3. Pumpdown – Unit is doing a normal shutdown.
T1 - Off to Auto. All of the following are required:
• Unit is enabled
• No unit alarm requiring shutdown is active
• At least one circuit is enabled to start
• If unit mode = Ice, Ice Delay is not active
• Low Ambient Lockout is not active
• Basic unit conguration is complete
• Control system has rebooted since conguration changed
• If Cond Fan Cong = All Fan VFD, DC controller = Auto
T2 - Auto to Pumpdown. Any of the following are required:
• Unit is disabled
• Unit Mode = Ice and LWT target is reached
• Unit alarm requiring normal shutdown is active
• Low Ambient Lockout is active
T3 - Pumpdown to Off. Any of the following are required:
• Unit alram requiring normal shutdown is active
• All circuits complete pumpdown
• Cond Fan Cong = All Fan VFD, DC controller = Auto
T4 - Auto to Off. Any of the following are required:
• Unit alram requiring normal shutdown is active
• No circuits enabled and all circuits in Off state
Unit Status
Unit Status is displayed to indicate the general condition of the unit. The following table lists the text displayed for each unit status
and the conditions that enable each status. If more than one status is enabled at the same time, the highest numbered status
overrides the others and is displayed.
Table 44: Unit Status Conditions
Enum Status Conditions
1 Auto Unit State = Auto
2 Auto: Sound Reduction Unit State = Auto and Sound Reduction is active
3 Off: Ice Mode Timer Unit State = Off, Unit Mode = Ice, and Ice Delay = Active
4 Off: Low OAT Lockout Unit State = Off and Low OAT Lockout is active
5 Off DC not ready Unit State = Off, Condenser Fan Conguration = All Fan VFD, and DC controller is not in auto control
6 Off: All Cir Disabled Unit State = Off and all circuits unavailable to start (temporary conditions are not considered)
7 Off: Unit Alarm Unit State = Off and manual reset Unit Alarm active
8 Off: Keypad Disable Unit State = Off and Unit Enable Set Point = Disable
9 Off: Remote Switch Unit State = Off and Remote Switch input is off
10 Off: BAS Disable Unit State = Off, Control Source = Network, and BAS Enable = false
11 Off: Unit Switch Unit State = Off and Unit Switch input is off
12 Off: Test Mode Unit State = Off and Unit Mode = Test
13 Auto: Wait for Load Unit State = Auto, no circuits running, and LWT is less than the active set point + startup delta
14 Auto: Evap Recirculate Unit State = Auto and Evaporator State = Start
15 Auto: Wait for ow Unit State = Auto, Evaporator State = Start, and Flow Switch input is off
16 Auto: Pumpdown Unit State = Pumpdown
17 Auto: Max Circuit Run Unit State = Auto, Unit Mode = Cool, number of running circuits is limited by the Max Cir Run set point
18 Auto: Unit Cap Limit Unit State = Auto, unit capacity limit has been met or exceeded
19 Auto: RapidRestore Unit State = Auto, unit is performing RapidRestore operation
20 Off: Invalid Cong The unit conguration is not a valid combination or not complete.
21 Off: Cfg Chg, Rst Ctlr Unit conguration set point has changed, and reboot of controller is required
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