20 AGZ 025D through 190D OMM 1166-1
Security
All setpoints are protected using passwords. A four-digit password provides operator access to changeable
parameters. Service level passwords are reserved for authorized service personnel. .
Operator password: 2526
Entering Passwords
Passwords are entered on the first screen on the unit controller,
If the wrong password is entered, a message will temporarily appear stating this. If no valid password is
active the active password level displays “none”.
Editing Setpoints
After a valid password has been entered at the unit controller, setpoints may be changed. If the operator
attempts to edit a setpoint for which the necessary password level is not active, no action will be taken.
Once a password has been entered, it remains valid for 10 minutes after the last key-press on the unit
controller.
Unit Functions
Definitions
The calculations in this section are used in unit level and circuit control logic.
LWT Slope
LWT slope is calculated such that the slope represents the estimated change in LWT over a time frame of one
minute.
Pulldown Rate
The slope value calculated above will be a negative value as the water temperature is dropping. A pulldown
rate is calculated by inverting the slope value and limiting to a minimum value of 0°C/min.
LWT Error
LWT error is calculated as:
LWT – LWT target
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