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Operating Procedures
There are five BMS communication options:
Note: BMS is not included as standard, but available as an
option.
1. BACnet® MS/TP - Connection through built-in BMS2
port.
2. BACnet IP - BACnet router is used.
3. Modbus® RTU - Connection through built-in BMS2
port.
4. Modbus IP - Modbus router is used.
5. LonWorks® - LonWorks router is used.
Controllers
The distributed primary microprocessor control system
enables all secondary modules to operate independently in
the event that the primary microprocessor controller fails.
All chiller/heat pump safeties including temperature set
point, refrigerant pressures, and freeze protection are
preserved.
In a normal configuration, a secondary controller controls
the single module to which it is dedicated.
The secondary controller monitors key performance
parameters for its module and sends real-time information
to the primary controller. The primary controller monitors
the performance of the chiller/heat pump, activating and
deactivating modules as needed to maintain the leaving
fluid temperature for the chiller/heat pump.
(See the following figure for a simplified example of a
typical microprocessor controller network.)
Figure 10. Typical controller network
Figure 11. Carel medium c.pCO primary controller
28
Operating the Microprocessor
The touchscreen interface panel is ready to use when it is
connected to the Ethernet switch and chiller/heat pump
power is ON.
Upon initial start-up, the status line will indicate that the
chiller/heat pump is OFF. Press On/Off button on the home
screen to enable System On/Off control pop-up screen.
Next, turn heat pump on or off manually or switch over to
BMS control.
Microprocessor Functions
For practical purposes, all essential control information and
operator actions are read and responded to using the
touchscreen interface panel. The touchscreen interface
panel is connected to the primary microprocessor controller
and is the only way to access many primary controller
functions.
NOTICE
Component Damage!
Failure to follow instructions could damage sensitive
electronic components beyond repair.
To prevent arcing or surges of electrical current, do
not use wires or cables to jump components or
bypass the manufacturer's safety systems.
Password Protection
There are three levels of access to the functions displayed
on the interface. The basic level, 'user,' does not require a
password. The higher access levels are the technician
('tech') and administrator ('admin') levels that can only be
accessed by Trane technical personnel. Contact Trane
technical support regarding the possibility of any potential
issues involving the higher-level functions.
Operator Control
A touchscreen interface panel is the primary means for the
operator or maintainer to monitor and modify a host of
functions involving temperatures, pressures, set points
alarms, operating schedules, elapsed operating hours, etc.
This touchscreen interface panel can be located within
proximity of the primary microprocessor controller. It is
typically located in the primary module.
The touchscreen interface is connected to and
communicates with all module controllers via the Ethernet
switch. It accesses overall chiller/heat pump functions and
settings as well as individual module settings.
In this manual, all functions, procedures, checklists, system
information, and changes in system parameters (set points,
alarms, primary chiller/heat pump controls, and so forth)
are written assuming the operator is using the touchscreen
interface panel.
When connected to the Ethernet switch, the touchscreen
interface panel displays current, real-time, information
about the chiller/heat pump, as well as the status of critical
ARTC-SVX010A-EN
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