Unit installation

OMRCPMICRO 49
than one day, use the Incr and Decr keys to set the holiday duration and press Enter to store the information in
the controller. Use the Next Item key to set additional holiday dates and durations for the entire year.
Menu #22: Alarm Set Points
—On a call for cooling or heating, the controller will open the liquid line solenoid valve. When the evaporator
pressure rises above the Low Pressure CutIn set point, the first compressor will be started. The Low Pressure
CutOut set point determines the point at which the compressors will shut off during a pumpdown sequence.
The Refrigerant Freeze and Water Freeze alarm set points may be adjusted as required. Water and refrigerant
freeze alarm time delays may also be adjusted for this menu. If the condenser High Pressure set point is
exceeded, the controller will shut off the unit.
When the unit's operation of ChlTmp is selected from Menu 23 and the unit is running in the heating mode
(applicable to THR heat pumps only), if the leaving evaporator water temperature drops below the LoSourcT
set point, all running compressors will run unloaded. The condition will continue until the leaving evaporator
temperature rises to 40°F or an appropriate alarm condition is logged. For specific alarm information, see the
Safety Systems portion of this manual.
Menu #23: Miscellaneous Setup
—Several general operating characteristics are defined here. These are set at the factory prior to unit delivery
and should not require adjustment. The control software version number is displayed form this menu. For
Identification information, see page 15.
Item E on Menu 23 allows the user to select the unit as a chiller or a chiller/Templifier. The selection of
"ChlTmp" should only be used when the unit is a THR (Templifier) heat pump.
Item F (OAT select) allows the user to select where the signal for outdoor air temperature is received from.
Outdoor air temperature is displayed on Menu 12. "None" means there is no sensor signal to be received.
"Lcl" or Local means the signal is received from a sensor on the unit itself. "Lcl" is applicable to air cooled
units only. "Rmt" or Remote means a signal is to be received from the network to which the chiller is
connected.
Alarm menus
Menus 24 through 27 are used to display any alarm conditions which may be present in the unit. All alarm
messages are accompanied by the date and time when the alarm occurred. Important operating conditions at
the time of the alarm are stored in the controller's memory and may be viewed within the following alarm menus.
Menu #24: Circuit #1 Current Alarm
—If refrigerant circuit #1 is in an alarm condition, the appropriate alarm message will be displayed here. The
temperature and pressure readings at the time of the alarm will be stored in the controllers memory and may be
displayed for analysis from this menu.
Menu #25: Circuit #2 Current Alarm
—If refrigerant circuit #2 is in an alarm condition, the appropriate alarm message will be displayed here. The
temperature and pressure readings at the time of the alarm will be stored in the controllers memory and may be
displayed for analysis from this menu.
Menu #26: Circuit #1 Previous Alarm
—The alarm type for the last recorded circuit #1 alarm may be displayed from this menu. The time and date at
which the previous alarm occurred are also displayed here. This information will be replaced when a current
alarm condition is cleared.
Menu #27: Circuit #2 Previous Alarm
—The alarm type for the last recorded circuit #2 alarm may be displayed from this menu. The time and date at
which the previous alarm occurred are also displayed here. This information will be replaced when a current
alarm condition is cleared.