Automatic Building Schedules - Honeywell LCBS Applications Manual

LCBS CONNECT SOLUTION
Here is a typical case of how control systems are designed to work and how building
occupant's well intentioned efforts can cause facility operational problems.
Typical CVAHU systems observe a control operation strategy called "automatic heating and cooling changeover." This
operation ensures that mandatory, building code compliant heating, cooling, and ventilation occurs in a commercial
building. If the system permits, a building occupant can change this operational to "cooling" or "heating" only. A well
intentioned building occupant may simply be hot or cold and may change settings to achieve personal comfort.
This action is not without consequences. If this setting is erroneously left in the "cooling" or "heating" position, when
climate changes, mechanical heating and cooling is locked out. This will lead to an inevitable service call at 1] will cost the
building owner hundreds of dollars due to service contractor interaction or 2] a service contractor who can't bill for the
call due to service contractor type.
Enter LCBS Connect
A contractor that has adopted LCBS Connect will have remote access to the customer's site and will allow
remote remediation of the problem and will save a truck roll to the customer's site. Providing local access to
building occupants should be weighed and discussed carefully with the building owner and those paying for
maintenance and utility bills.

AUTOMATIC BUILDING SCHEDULES

Automatic Occupancy Control Theory and Operation
For building owners and operators, we assume two basic things: indoor commercial building environments need to be
heated, cooled, and ventilated for human health and comfort during the time humans occupy a building. There are
important secondary issues relating to occupancy including management and protection of assets during periods when
humans don't occupy building spaces including protection of plants, precious artwork, plumbing, paper products, and
wall and floor coverings. Excessive heat, cooling, and humidity conditions can cause damage to building.
Ensuring that building space is conditioned to make sure building occupants are comfortable is quite different than
making sure that it is warm or cool enough to protect plumbing from freezing and from wall paper and paint from peeling
off the wall. In general, the energy required to operate systems to provide human comfort is 2-5X the cost to protect
assets in a building without humans present.
How does occupancy methodology work?
LCBS Connect allows HVAC service contractor and customers to develop schedules via LCBS Connect tools including
local operator interface or remote cloud based tool to match building occupancy schedules. These schedules can be also
be set to accommodate occurrence of special events and holidays.
To ensure that proper comfort conditions are achieved by desired occupancy, Honeywell has developed an algorithm to
meet these needs. Honeywell's answer to this recovery process is called "Adaptive Intelligent Recovery™" Implementing
this correctly will require knowledge by the HVAC professional regarding the rate at which the HVAC system can provide
restorative heat injection (heating), heat removal (cooling) in a building space. This recovery algorithm also keeps HVAC
systems from starting suddenly and creating an excessive electrical in-rush that can result in undesirable utility demand
control charges. The payoff to getting this "right" is huge. We want to keep building occupants and patrons comfortable
and control energy usage and associated costs. Honeywell Adaptive Intelligent Recovery permits us to meet this
requirement.
LCBS Connect controllers also have the ability to control temperature to "standby" set points. This set point technique is
typically applied to building spaces that are randomly and infrequently occupied. A good example of the application of
the standby set point is for an office or meeting room. The standby heating set point is always set the same or slightly
below the standard occupied set point and the standard cooling set point is always set the same or slightly above the
standard occupied set point. If the space temperature is being controlled at the standby set point, it is assumed that the
building space being controlled is unoccupied. The benefit of using the standby strategy is twofold... 1] to make sure that
building occupants are comfortable when they enter randomly occupied spaces and 2] reduce energy usage by altering
HVAC control and reducing ventilation when building occupants aren't in the randomly occupied building space. The
transition of standby set points from "standby" to "occupied" is typically initiated by a "motion sensor" detecting
occupancy in the building space. Likewise, if the motion sensor does not detect motion, the set point is transitioned from
"standby" to "unoccupied."
In order to comply with building codes, during scheduled "occupied" periods, the supply fan will run 100% on. Why? Most
prevailing building codes require "continuous fresh air ventilation" and a specific requirement of fresh air, outdoor air
based on an aggregate CFM per hour or CFM per person in the building space. Without going into detail, it is literally
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