User's Manual

CentraLite EMS
Operations, Maintenance & Service Manual
Page 5 of 31
Network Infrastructure
The door and motion sensors are associated with the thermostat through the Room Area
Network(RAN). The room thermostats are associated with one Ethernet Coordinator(EC) which
is connected to the EMS server through the hotel’s Ethernet network.
Energy Management System (EMS)
The core of the EMS system is the EMS Server. The EMS Server receives room information
through its connection to the Ethernet Coordinators(ECs). The EMS Server also sends information
to the room devices. In addition, check-in and check-out signals are received from the hotel’s
reservation system. Access to the EMS server is made using the CentraLite EMS client software
which connects to the EMS Server Database.
The conditions that the system uses to maximize energy savings under either heating or cooling
conditions for guest rooms are:
o Room Unrented, Room Unoccupied
o Room Unrented, Room Occupied by Housekeeping or Engineering, etc
o Room Rented, Room Occupied
o Room Rented, Room Occupied, guest manually sets thermostat temperature
o Room Rented, Room Unoccupied
Before a guest is checked-in and the room is not occupied, the thermostat SETPOINT temperature
is set to the VACANT Cooling/Heating setting to maximize energy savings. The EMS will allow the
room temperature by the DEEP SETBACK differential above or below the SETPOINT temperature
before the HVAC system is activated.
If the room becomes occupied before a guest is checked-in such as when housekeeping or
engineering is working in the room, the thermostat holds to the standard differential around the
SETPOINT as long as the room is occupied. The EMS uses these settings as long as the room
remains occupied. When the room is no longer occupied after 15 minutes, the thermostat
SETPOINT temperature” is automatically set back to the Unrented Default SETPOINT.
When a guest is checked-in through the registration system the thermostat SETPOINT temperature
is set to the “Occupied” Default Setpoint. The EMS will turn on the HVAC system to bring the room
to the selected temperature before the guest arrives at the room. Once the SETPOINT
temperature is achieved, the HVAC system is turned off and the temperature is allowed to drift (up
or down) by the number of degrees in the Standard Differential setting before the HVAC system is
again turned on.
If the thermostat setting is changed manually after a guest has checked-in the new temperature
becomes the SETPOINT temperature and the room temperature is allowed to fluctuate by the
number of degrees in the occupied Standard Differential setting. A manually set SETPOINT
temperature is automatically kept within the range of the “SETPOINT Upper and Lower Limits” set in
the Room Thermostat Settings. This setting remains in effect until the guest checks out.
When a guest leaves the room, after 15 minutes, the SETPOINT temperature is adjusted (up or
down) the number of degrees in the Unoccupied Setback setting. Once the room achieves the new
SETPOINT temperature the HVAC system is turned off. Afterwards the temperature is allowed to
drift (up or down) by the number of degrees in the Standard Differential setting before the HVAC
system is again turned on.