OMM 1008-1
19
At power-up the slave node checks if the master node is operational and if so, it sets its copy of the setpoint
equal to the master’s. Otherwise, the setpoint remains unchanged. During normal operation, any time the
master setpoint changes, the slave is updated as well.
The PW (password) column indicates the password that must be active in order to change the setpoint. Codes
are as follows:
O
= Operator,
M
= Manager,
T
= Technician (not available through the 4x20 display/keypad).
The following table groups setpoints that relate to the entire unit operation and are stored in the unit
controller. All settings are made through the OITS
Table 6, Controller Setpoints
Description
Default
Range
Type
PW
Unit
Unit Enable
OFF
OFF, ON
M
O
Control Source
KEYPAD
KEYPAD, BAS,
DIGITAL INPUT
N
O
Display Units
°
F/psi
°
F/psi,
°
C/kPa
N
O
Language
ENGLISH
ENGLISH, (TBD)
N
O
BAS Protocol
NONE
NONE, BACnet, LonWorks,
MODBUS, N2
N
M
Motor Amps
Demand Limit
OFF
OFF, ON
N
O
Minimum Amps
40%
20 to 80%
N
T
Maximum Amps
100%
40 to 100%
N
T
Soft Load
OFF
OFF, ON
D
M
Begin Amp Limit
40%
20 to 100%
N
M
Soft Load Ramp
5 min
1 to 60 min
D
M
Maximum Rate
0.5
°
F/min
0.1 to 5.0
°
F/min
D
M
Minimum Rate
0.1
°
F/min
0.0 to 5.0
°
F/min
D
M
Staging
Mode
Normal
Normal, Efficiency, Pump, Standby
N
M
Sequence #
1
1,2, … (# of Compressors)
N
M
Maximum Compressors ON
16
1-16
G
M
Stage Delta T
1.0
0.5-5.0
G
M
Full Load
120 sec
30 to 300 sec
N
T
Absolute Capacity
100 Tons
0 to 9999 Tons
D
T
Leaving Water
Cool LWT
44. 0
°
F
36.0 to 60.0
°
F
M
O
Startup Delta T
3.0
°
F
0.0 to 10.0
°
F
M
O
Shutdown Delta T
3.0
°
F
0.0 to 3.0
°
F
M
O
LWT Reset Type
NONE
NONE, RETURN, 4-20mA
N
M
Max Reset Delta T
0.0
°
F
0.0 to 20.0
°
F
N
M
Start Reset Delta T
10. 0
°
F
0.0 to 20.0
°
F
N
M
Timers
Evap Recirculate
30 sec
15 sec to 5 min
N
M
Start-Start
40 min
15 to 60 min
N
M
Stop-Start
3 min
3 to 20 min
N
M
Source No Start
70
°
F
50 to 100
°
F
D
T
Pumps
Evap Pump
Pump #1
Only
Pump #1 Only, Pump #2 Only, Auto
Lead, #1 Primary, #2 Primary
N
M
Cond Pump
Pump #1
Only
Pump #1 Only, Pump #2 Only, Auto
Lead, #1 Primary, #2 Primary
N
M
Cooling Tower
Tower Control
None
None, Temperature, Lift
N
M
Tower Stages
2
1 to 4
N
M
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