Comm5 UCMs
BMTW-SVN01F-EN 141
Description of Types
The following types of UCMs communicate with BCUs using a Comm5
communication link. For specific information about the number of each of
these types of UCMs allowed per BCU and per communications link, refer
to Table 7 on page 46.
Tracer AH540 and Tracer AH541 Air-Handler Controllers
The Tracer AH540 (factory-installed) and Tracer AH541 (field-installed)
air-handler controllers monitor and control Trane air handlers. The
Tracer AH540/541 controller supports three air-handler control
sequences: constant volume (CV) controlled by space temperature, CV
with discharge temperature control, and variable air volume (VAV).
Tracer Summit software supports the Tracer AH540/541 controller by
using the LonMark
™ Space Comfort Controller (SCC) profile or Dis-
charge Air Controller (DAC) profile. The object type used depends on the
sequence selected as part of the Tracer AH540/541 configuration (see
Table 28).
The Tracer AH540/541 controller needs to be configured (either at the fac-
tory or in the field with the Rover service tool) before connecting it to the
BCU.
Tracer Loop Controller Interface
The Tracer loop controller allows a Tracer Summit system to monitor and
control water-source heat pump systems.
Tracer MP501 Controller
The Tracer MP501 controller is a configurable, multi-purpose controller
used to provide direct-digital control for HVAC equipment. The Tracer
MP501 provides a single control loop with the following output types: 2-
stage, tri-state modulating, and 0–10 Vdc analog.
The controller can be configured to conform to the LonMark
™ SCC pro-
file or as a generic LonTalk
®
device (GLD object). In SCC mode, the
Tracer MP501 controls space temperature to an active setpoint. SCC
mode supports the following applications:
• Heating control loop
• Cooling control loop
• Two-pipe heat/cool automatic changeover using a communicated sup-
ply water temperature value
Table 28. Tracer AH540/541 control sequences in Tracer Summit
Unit Sequence
Tracer Summit Object
Ty p e
Space Temperature SCC
Discharge Temperature DAC
VAV DAC
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