IOM 1206-1
27
Unit Controller Operation
Setpoints
Setpoints are stored in permanent memory.
SetPoint Tables
Setpoints are initially set to the values in the
Default
column, and can be adjusted to any value in the
Range
column.
Unit Level Setpoints:
Description
Default
Range
Mode/Enabling
Unit Enable
Enable
Disable, Enable
Network Unit Enable
Disable
Disable, Enable
Control source
Local
Local, Network
Available Modes
Cool
Cool, Cool w/Glycol, Cool/Ice w/Glycol, Ice, Test
Network Mode Command
Cool
Cool, Ice
Staging and Capacity Control
Cool LWT 1
7°C (44.6°F)
See Auto Adjusted Ranges
Cool LWT 2
7°C (44.6°F)
See Auto Adjusted Ranges
Ice LWT
4.4°C (39.9°F)
-9.5 to 4.4 °C (14.9 to 39.9 °F)
Network Cool Set Point
7°C (44.6°F)
See Auto Adjusted Ranges
Network Ice Set Point
4.4°C (39.9°F)
-9.5 to 4.4 °C (14.9 to 39.9 °F)
Startup Delta T
5.6°C (10.1°F)
0.6 to 8.3 °C (1.1 to 14.9 °F)
Shut Down Delta T
0.3°C (0.5°F)
0.3 to 1.7 °C (0.5 to 3.1 °F)
Max Pulldown
0.6°C/min (1.1°F/min)
0.1 to 2.7 °C/min (0.2 to 4.9 °F/min)
Nominal Evap Delta T
5.6 °C (10.1°F)
3.3 to 8.9 °C (5.9 to 16 °F)
Demand Limit Enable
Off
Off, On
Network Capacity Limit
100%
0 to 100%
LWT Reset Enable
Off
Off, On
Configuration
Power Input
Single Point
Single Point, Multi Point
Evap Control
#1 Only
#1 Only, #2 Only, Auto,
#1 Primary, #2 Primary
Number of Compressors
4
4,6
Expansion Valve Type
Thermal
Thermal, Electronic
Fan VFD enable
No
No, Yes
Number of fans
4
4,6,8,10,12,14
Timers
Evap Recirc Timer
30
15 to 300 seconds
Stage Up Delay
240 sec
120 to 480 sec
Stage Down Delay
30 sec
20 to 60 sec
Stage Delay Clear
No
No, Yes
Start-start timer
15 min
10-60 minutes
Stop-start timer
5 min
3-20 minutes
Clear Cycle Timers
No
No, yes
Ice Time Delay
12
1-23 hours
Clear Ice Timer
No
No,Yes
Sensor Offsets
Evap LWT sensor offset
0°C (0°F)
-5.0 to 5.0 °C (-9.0 to 9.0 °F)
Evap EWT sensor offset
0°C (0°F)
-5.0 to 5.0 °C (-9.0 to 9.0 °F)
OAT sensor offset
0°C (0°F)
-5.0 to 5.0 °C (-9.0 to 9.0 °F)
Alarm Settings
Low Evap Pressure Unload
689.5 KPA(100 PSI)
See Auto Adjusted Ranges
Low Evap Pressure Hold
696.4 KPA(101 PSI)
See Auto Adjusted Ranges
High Condenser Pressure
4240 KPA(615 PSI)
3310 to 4275 KPA (480 to 620 PSI)
High Condenser Pressure Unload
4137 KPA(600 PSI)
3241 to 4137 KPA (470 to 600 PSI)
Evaporator Flow Proof
5 sec
5 to 15 sec
Evaporator Water Freeze
2.2°C (36°F)
See Auto Adjusted Ranges
Low OAT Start Time
165 sec
150 to 240 sec
Low Ambient Lockout
0°C (32°F)
See Auto Adjusted Ranges
External Alarm Configuration
Event
Event, Alarm
Clear Alarms
Off
Off, On
Network Clear Alarms
Off
Off, On
