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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 27: Unit Status Conditions
#
Status
0
AUTO
1
OFF:All Cir Disabled
2
OFF: Unit Alarm
3
OFF: Keypad Disable
4
Off: Remote Switch
5
OFF: BAS Disable
6
OFF: Unit Switch
7
OFF: Test Mode
8
AUTO: Wait For Load
AUTO: Evap Recirc or
9
Cond Recirc
AUTO: Wait Cond Flow or
10/11
Wait Evap Flow
12
AUTO: Pumpdown
13
AUTO: Max Pulldn Rate
14
AUTO: Unit Cap Limit
15
OFF: Cfg Chg Rst Ctrl
16
OFF: Invalid Config
Evaporator Pump Control
Three evaporator pump control states for control of the
evaporator pumps.
1. Off - No pump on.
2. Start – Pump is on, water loop is being recirculated.
3. Run – Pump is on, water loop has been recirculated, and
circuits can start if needed.
RUN
IOM 1264-1 • NAVIGATOR
®
Conditions
Unit State = Auto
Unit State = Off and all circuits unavailable to start (temporary conditions are not considered to be a cause
of a circuit being unavailable)
Unit State = Off and manual reset Unit Alarm active
Unit State = Off and Unit Enable Set Point = Disable
Unit State = Off and Remote Switch input is Off
Unit State = Off, Control Source = Network, and BAS Enable = false
Unit State = Off and Unit Switch input is Off
Unit State = Off and Unit Mode = Test
Unit State = Auto, no circuits running, and LWT is less than the active set point + startup delta
Unit State = Auto and Evaporator State = Start or Condenser State = Start
Unit State = Auto, Evaporator State = Start and Flow Switch input is off, or Condenser State = Start and
Flow Switch input is off
Unit State = Pumpdown
Unit State = Auto, unit capacity limited by the evap EWT pulldown rate
Unit State = Auto, unit capacity limit has been met or exceeded
A configuration change requiring a reboot has occurred but controller has not been rebooted yet.
The unit configuration is not complete.
START
5
MODEL WWV CHILLERS
T1 - Off to Start - Requires either of the following to be true:
• Unit state = Auto
• Freeze protection started
T2 - Start to Run - Requires the following to be true for time
longer than evaporator recurculate time set point:
• Evap state = Start
• Evaporator flow switch input is on
T3 - Run to Off - Requires all of the following to be true:
• Unit state = Off
• Freeze protection is not active
T4 - Start to Off. - Requires all of the following to be true:
• Unit state = Off
• Freeze protection is not active
T5 - Run to Start. - Requires the following to be true for longer
than the Evaporator Flow Loss Delay set point:
• Evap State = Run
• Evaporator flow switch input is off.
26
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