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Operation Manual
D
–EOMWC00A07-16_02EN
7.6
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
-
-
3
Off:All Cir Disabled
Unit State = Off and all compressors unavailable
4
Off:Unit Alarm
Unit State = Off and Unit Alarm active
5
Off:Keypad Disable
Unit State = Off and Unit Enable Set Point = Disable
6
Off:Remote Switch
Unit State = Off and Remote Switch is open
7
Off:BAS Disable
Unit State = Off, Control Source = Network, and BAS Enable = false
8
Off:Unit Switch
Unit State = Off and Unit Switch = Disable
9
Off:Test Mode
Unit State = Off and Unit Mode = Test
10
Auto:Noise Reduction
Unit State = Auto and Noise Reduction is active
11
Auto:Wait for load
Unit State = Auto, no circuits running, and LWT is less than the active
set point + startup delta
12
Auto:Evap Recirc
Unit State = Auto and Evaporator State = Start
13
Auto:Wait for flow
Unit State = Auto, Evaporator State = Start, and Flow Switch is open
14
Auto:Pumpdown
Unit State = Pumpdown
15
Auto:Max Pulldown
Unit State = Auto, max pulldown rate has been met or exceeded
16
Auto:Unit Cap Limit
Unit State = Auto, unit capacity limit has been met or exceeded
17
Auto:Current Limit
Unit State = Auto, unit current limit has been met or exceeded
18
Off:Config Changed, Reboot
Unit State = Off and Unit Enable Set Point = Disable
19
Off:Set Mfg Location
Unit State = Off and Unit Enable Set Point = Disable
7.7
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 specific ally for clearing the ice mode
delay is available. In addition, cycling the power to the controller will clear the ice delay timer.
7.8
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
•
EWT is less than the Evap Freeze set point minus 0.6 °C and EWT sensor fault isn’t active
The control state is Run when the flow switch input has been closed for a time greater than the Evaporator Recirculate set
point.
