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MODBUS™ Slave
•
LonTalk™ using LCI-C (from the IPC3 bus)
Rotary Switches
There are three rotary switches on the front of the UC800 controller. Use these switches to define a three-
digit address when the UC800 is installed in a BACnet or MODBUS system.
Note:
Valid addresses are 001 to 127 for BACnet and 001 to 247 for MODBUS.
LED Description and Operation
There are 10 LEDs on the front of the UC800. The following
the following
Table 6
Table 6 LED behavior
LED
exist.
there Marquee LED
LINK, MBUS,
IMC
other
Ethernet Link
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Service
Do not use.
Important: Maintain at least 6 inches between low- voltage (<30V) and high voltage circuits. Failure to do so
could result in electrical noise that could distort the signals carried by the low-voltage wiring, including IPC.
Operating Principles
General
The refrigeration cycle of RTXC XE is conceptually similar to that of other Trane air-cooled screw heat
pumps, including single refrigerant circuit unit, dual refrigerant circuit unit, and assembly unit with master-
slave control system. RTXC110XE has a single refrigerant circuit with one compressor with economizer and
one water loop. RTXC180/220XE units use dual refrigerant circuits with two compressors with economizer
and one water loop, while RTXC160/200XE are without economizer. RTXC310/330/360/400/440XE units are
duplex units assembled by the customer on site.
with economizer and partial heat recovery option.
describes their behavior in specific instances.
Figure 15 LED locations
UC800 Status
Powered. If the Marquee LED is green solid, the UC800 is powered and no problems
Low power or malfunction. If the Marquee LED is red solid, the UC800 is powered, but
are problems present.
Alarm. The Marquee LED blinks Red when an alarm exists.
The TX LED blinks green at the data transfer rate when the UC800 transfers data to other
devices on the link.
The Rx LED blinks yellow at the data transfer rate when the UC800 receives data from
devices on the link.
The LINK LED is solid green if the Ethernet link is connected and communicating.
The ACT LED blinks yellow at the data transfer rate when data flow is active on the link.
The Service LED is solid green when pressed. For qualified service technicians only.
Figure 15
shows the locations of each LED and
Figure 16
shows the schematic of a single refrigerant circuit
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