User's Manual

CentraLite EMS
Operations, Maintenance & Service Manual
Page 4 of 31
the same way as guest rooms, or can be manually controlled through the online EMS.
In-Room Components
The in-room components of the EMS include a Zigbee motion sensor, a Zigbee door sensor, and a
Zigbee thermostat. The door and motion sensors are battery powered using a CR-2 type lithium
battery. The typical battery life is 2 years for each sensor.
Thermostat
The CentraLite thermostat is used to control the HVAC equipment in the guest rooms. Each
thermostat uses 2 independent Zigbee radios. One radio is used for the local Room Area
Network(RAN) within the room and the other radio is used to attach to the Hotel Area
Network(HAN). The thermostat requires 24V AC from the HVAC equipment it controls.
Motion Sensor (PIR)
The motion sensor uses a Passive Infrared (PIR) sensor to detect heat patterns in the room. Motion
will be signaled to the thermostat if the heat pattern changes. The thermostat combines PIR motion
sensor signals in a logic sequence with door switch signals to determine whether a room is
occupied or unoccupied. The PIR is wireless and can be mounted in the best location. The motion
sensor uses a CR-2 lithium battery.
Door Sensor
The door sensor consists of a base(containing the Zigbee radio, magnetic sensor, and battery) and
separate magnet. It is very important that the base and magnet line up correctly and be within ½”
when the door is closed. The door sensor uses a CR-2 lithium battery.
Occupancy Logic
The room thermostat receives signals from the door and motion sensor in the room. These sensors
are specifically addressed to the thermostat in that room. Whenever the door opens and closes the
exit delay timer is started. The thermostat is looking for any motion signals during this 15
minute(default) timer. If any motion signals are received, then the room is considered occupied. If
no motion signals are received then the room is considered Unoccupied and goes into a setback
mode.
If at any time during the Unoccupied mode the thermostat receives any motion signals, then the
thermostat will immediately consider the room occupied and go back to normal mode.
If the door opens while in unoccupied mode the thermostat will go into normal mode and immediately
begin conditioning the room.
In unoccupied mode, the thermostat does not turn itself off. It allows the room temperature to drift
more around the guest’s SETPOINT temperature. The goal is to allow room temperature to drift
enough to save energy but not enough to make the guest uncomfortable upon their return. And
when the room is Unrented the room temperature can be allowed to drift even more.