User's Manual

CentraLite EMS
Operations, Maintenance & Service Manual
Page 3 of 31
Introduction
The CentraLite Energy Management System (EMS) has been installed to reduce energy costs by
minimizing HVAC usage when a guest room is Unrented or Vacant. The EMS system allows
continuous monitoring of all online devices within the property.
System Operation
The highest priority EMS design criterion was to maintain guest comfort while minimizing HVAC
energy usage in every hotel room.
The opportunities for hotel in-room energy savings are created when a room is unoccupied. And an
increased amount of savings can be garnered when the room is also Unrented.
The CentraLite EMS uses the concept of SETPOINT temperature settings to manage activation of
HVAC systems in hotel guest rooms. The EMS sets individual room thermostats at different
SETPOINT temperature settings depending on whether the room is unoccupied along with whether
the guest has checked-in. The EMS allows the room temperature to fluctuate up or down a pre-
determined number of degrees from the SETPOINT temperature before activating the HVAC
system based upon “Standard Differentials”, “Setbacks” and “Deep Setback” settings. The purpose
of these variable fluctuations is to ensure that the proper SETPOINT temperature is maintained
while reducing the number of times the HVAC system is activated. A guest can change the room
thermostat SETPOINT temperature at any time. When the thermostat setting is changed manually,
the new setting will be used as the SETPOINT temperature until the guest is checked-out.
There are three room conditions used by the EMS to control energy usage under all in-room
Heating and Cooling conditions; “Occupied”, “Setback” and “Deep Setback”. A SETPOINT
temperature is allowed to fluctuate within “Differential” and “Setback” settings to maintain guest
comfort levels and to maximize energy savings by minimizing HVAC activation.
The “Deep Setback” cooling and heating SETPOINT temperature is automatically set by the EMS
when a room becomes Unrented.
When a guest is checked-in the EMS system immediately sets the room thermostat into “AUTO”
mode and changes the room thermostat setting to the RENTED default SETPOINT temperature.
The purpose is to ensure that the temperature is suitable to the guest by the time the room is
entered. When the guest arrives at the room temperature is allowed to fluctuate according to a pre-
determined “Differential” number of degrees around the SETPOINT temperature.
The SETPOINT temperature can be changed at the thermostat at any time. If the thermostat setting
is changed manually, the SETPOINT room temperature is changed to the new setting. The EMS will
use the manually set temperature as the room SETPOINT temperature until the guest is checked-
out. The manually set SETPOINT temperature is automatically kept within the range of UPPER and
LOWER limits set in the Room Thermostat Settings.
When the room is RENTED but UNOCCUPIED the thermostat will go into SETBACK mode. It will
be allowed to drift by the SETBACK differential(default 3 degrees) above or below the SETPOINT
temperature before the HVAC will activate.
When the room becomes UNRENTED, the EMS system sets the thermostat to the UNRENTED
default SETPOINT temperature and puts the thermostat into the DEEP SETBACK mode. The
thermostat will be allowed to drift by the DEEP SETBACK differential(default 6 degrees) above or
below the SETPOINT temperature.
Training rooms or other special purpose hotel rooms can be automatically controlled by the EMS in