31
Events/States
Description
Alarm - Latching
This output is true whenever there is any active diagnostic that requires a manual reset to clear,
that affects the unit, or the Circuit. This classification does not include informational diagnostics.
Alarm - Auto Reset
This output is true whenever there is any active diagnostic that could automatically clear, that
affects the unit, or the Circuit. This classification does not include informational diagnostics.
Alarm
This output is true whenever there is any diagnostic affecting any component, whether latching
or automatically clearing. This classification does not include informational diagnostics.
Unit Limit Mode
This output is true whenever the unit has been running in any unloading types of limit modes
continuously a certain time period (default is 10 minutes).
Maximum Capacity
This output is true whenever the unit has reached maximum capacity for a certain time period
(default is 10 minutes); whenever the unit has quitted the maximum capacity for a certain time
period, this output is false.
Compressor Running
This output is true whenever compressor is running on the unit.
Heating/Cooling
Mode
This output is true whenever unit is running under heating mode (include warm up, defrost);
This output is false whenever chiller is running under cooling mode.
UC800 Service Tool (Tracer TU) is used to install the Alarm and Status Relay Option package and assign any of
the above list of events or status to each of the four relays provided with the option.
The default assignments for the four available relays of the RTXC XE Alarm and Status Package Option are:
LLID Naming
Assignment
Contact Terminal
Default Setting
Unit Status
Programmable relay
Relay 1
1A21, J2-10,11,12
Maximum Capacity
Relay 2
1A21, J2-7,8,9
Compressor Running
Relay 3
1A21, J2-4,5,6
Alarm
Relay 4
1A21, J2-1,2,3
Unit limit
The relay will be energized when the event/state occurs.
Emergency stop
UC800 provides auxiliary control for a customer specified/installed latching trip out. When this customer-furnished
remote contact is provided, the unit will run normally when the contact is closed. When the contact opens, the unit
will trip on a manually resettable diagnostic. This condition requires manual reset at the unit switch on the front of
the control panel. When this function is required, remove the jumper W2, which is on J2-3 and J2-4 of module
1A14, then connect to the emergency stop device contact. Dry contact is acceptable only.
For Master-Slave unit, remove the jumpers W2, which are on Master section and Slave section terminal 1X5-40
and 1X541, then connect to the emergency stop device contacts. All the contacts shall be connected to one single
emergency stop switch.
External Auto/Stop
If the unit requires the external Auto/Stop function, the installer must remove the jumper W1 which is on terminal
1X5-41 and 1X5-42, then connect to the remote contact. Dry contact is acceptable only. The unit will run normally
when the contacts are closed. When either contact opens, the compressor(s), if operating, will go to the RUN:
UNLOAD operating mode and cycle off. Unit operation will be inhibited. Closure of the contacts will permit the unit
