OMM 1008-1
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3.
Press the CHANGE button indicating that you wish to change a setpoint value. The KEYBOARD screen
will be turned on automatically to facilitate entering the password.
•
O = Operator level password is 100
•
M = Manager level password is 2001
•
T = Technician level password
4.
Press the appropriate numbers in the numeric keyboard to enter the password. There is a small delay
between pressing the keypad and recording the entry. Be sure that an asterisk appears in the window
before pressing the next number. Press ENTER to return to the SETPOINT screen. The password will
remain open for 15 minutes after initiation and does not need to be re-entered.
5.
Press CHANGE again. The right side of the screen will turn blue (inactive).
6.
The numeric keypad and action buttons in the lower left-hand corner of the screen will be activated (the
background will turn green). Setpoints with numeric values can be changed in two ways:
•
Select the desired value by pressing the numbered buttons. Press ENTER to enter the value or
CANCEL to cancel the transaction.
•
Press the UP or DOWN button to increase or decrease the value displayed. Press ENTER to enter the
value or CANCEL to cancel the transaction.
Some setpoints are text rather than numeric values. For example, LWT Reset Type can be "None" or
"4-20 ma." The selection can be made by toggling between choices using the UP or Down button. If
dashed lines appear in the setpoint window, it indicates that you have toggled too far and need to
reverse direction. Press ENTER to enter the choice or CANCEL to cancel the transaction.
Once CHANGE is selected, the CANCEL or ENTER buttons must be pressed before another setpoint
can be selected.
7.
Additional setpoints can be changed by selecting another setpoint on the screen or by selecting an entirely
new group of setpoints.
Explanation of Setpoints
Each of the seven setpoint group of screens are detailed in the following section.
1.
TIMERS, for setting timers such as start-to-start, etc.
2.
ALARMS, for setting the limit and shutdown alarms.
3.
VALVE, sets the parameters for operation of an optional field-installed tower bypass valve.
4.
TOWER, selects the method of controlling the cooling tower and sets the parameters for fan
staging/VFD.
5.
MOTOR, selects motor related setpoints such as amp limits. Also has maximum and minimum rate of
change of chilled water temperature.
6.
MODES, selects various modes of operation such as control source, multiple compressor staging, pump
staging, BAS protocol, etc.
7.
WATER, leaving water temperature setpoint, start and stop delta-T, resets, etc.
