KOMAC00607-09EN 23
Unit Status
The displayed unit status is determined by the conditions in the following table:
Enum Status Conditions
0 Auto Unit State = Auto
1 Off:Ice Mode Timer
Unit State = Off, Unit Mode = Ice, and Ice Delay =
Active
2 Off:OAT Lockout Unit State = Off and Low OAT Lockout is active
3 Off:All Cir Disabled Unit State = Off and all compressors unavailable
4 Off:Emergency Stop Unit State = Off and Emergency Stop Input is open
5 Off:Unit Alarm Unit State = Off and Unit Alarm active
6 Off:Keypad Disable Unit State = Off and Unit Enable Set Point = Disable
7 Off:Remote Switch Unit State = Off and Remote Switch is open
8 Off:BAS Disable
Unit State = Off, Control Source = Network, and BAS
Enable = false
9 Off:Unit Switch Unit State = Off and Unit Switch = Disable
10 Off:Test Mode Unit State = Off and Unit Mode = Test
11 Auto:Noise Reduction Unit State = Auto and Noise Reduction is active
12 Auto:Wait for load
Unit State = Auto, no circuits running, and LWT is
less than the active set point + startup delta
13 Auto:Evap Recirc Unit State = Auto and Evaporator State = Start
14 Auto:Wait for flow
Unit State = Auto, Evaporator State = Start, and Flow
Switch is open
15 Auto:Pumpdown Unit State = Pumpdown
16 Auto:Max Pulldown
Unit State = Auto, max pulldown rate has been met or
exceeded
17 Auto:Unit Cap Limit
Unit State = Auto, unit capacity limit has been met or
exceeded
18 Auto:Current Limit
Unit State = Auto, unit current limit has been met or
exceeded
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 user adjustable.
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 will clear the ice delay timer.
Evaporator Pump Control
Three evaporator pump control states for control of the evaporator pumps:
• Off - No pump on.
• Start – Pump is on, water loop is being recirculated.
• Run – Pump is on, water loop has been recirculated.
The control state is Off when all of the following are true:
• Unit state is Off
• LWT is higher than the Evap Freeze set point or LWT sensor fault is active
• EWT is higher than the Evap Freeze set point or EWT sensor fault is active
The control state is Start when any of the following are true:
• The unit state is auto
• LWT is less than the Evap Freeze set point minus 0.6 °C and LWT sensor fault
isn’t active
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