Unit installation

26 OMRCPMICRO
Unit Status Modes
The operating status of the unit is displayed on the keypad/display when the information is requested by the
operator. Description of each Unit Status Mode are listed below.
"Off: Remote SW" mode
Upon start-up, the panel will check the "Remote Stop Switch" digital input. If the switch is open, the controller
will be in the "Off: Remote SW" mode. Note that from the factory, the unit will ship with a mechanical jumper
between the field terminals. If remote stop/start control is desired, remove jumper between terminals 140 and
141.
"Off: Time Clock" mode
If the controller has been commanded to an off state via the internal time clock (Menu 20), the mode will be
"Off: Time Clock". Note that if a customer wishes the unit to run 24 hours per day, the eight day clock must be
set to start at 00:00 and stop at 23:59 for all days.
"Starting" mode
If the remote stop switch is closed and the internal time clock is calling for the unit to run, the controller will
initiate "Starting" mode.
"Wait for Flow" mode
The chilled water pump output relay is energized any time the unit is enabled. The controller will check for the
presence of chilled water flow via the normally open flow switch. If flow is not proven within 30 seconds, the
alarm "LossofWater Flow" will be activated and the unit will remain in the "Waiting for Flow" mode until water
flow is proven. Once flow is established, the alarm will automatically be cleared.
Loss of water flow during unit operation will cause the unit to log the alarm and return to the "Waiting for
Flow" state. When chilled water flow has been re-established, the alarm will again automatically be cleared.
"Wait for Load" mode
With water flow established, the controller will wait for a period of time equal to the "Load Delay" set point to
determine if the water loop is above or below the current active water set point. In chiller mode, if leaving
chilled water temperature is above the leaving chilled water set point plus 1/2 of the control band plus the
start-up delta-T, the controller will enter the stage mode otherwise the controller will wait until the end of the
currently scheduled run period.
In heating mode (Templifier only), if the leaving condenser water temperature is below the leaving condenser
water set point minus 1/2 the control band minus the start-up delta-T, the controller will enter the stage mode.
"Stages 1-8"
This is the normal mode the unit will be in while cooling or heating. The number of currently active stages will
be displayed. The stage is only an indicator of system capacity and does not indicate which compressors or
circuits are on.
"Off: Alarm"
This is the mode which will be displayed when a circuit is in an alarm condition which means no cooling or
heating on that circuit is possible. Refer to the System Alarms and Circuit Alarms sections in this manual for
additional details.
"Off: Manual" mode - If the control mode of the unit is "Manual Off" the unit status will be displayed as "Off:
Manual" mode.
"Off: PumpDnSw's" - If the pumpdown switch digital inputs for both circuits are in the "manual " position,
the mode of the unit is "Off: PumpDnSw's".
"Manual Stage" - If the control mode of the unit is "Manual Stage" the unit status will be displayed as
"Manual Stage".