Honeywell LCBS Connect, Руководство по применению, Страница: 26 / 44

LCBS CONNECT SOLUTION
31-00118EFS—01 26
NOTICE
Design considerations. You have determined that it will get uncomfortable in the space when relative humidity
exceeds 50%. This will drive the selection of the "alert limit." Further, you want to make sure that you don't have
excessive alert activity, so you should set alert hysteresis at 15 minutes. This means that the humidity level needs
to exceed 50% for 15 minutes or longer. If the humidity level rises above 50% and then fall below 50%, the timer is
reset. You can further create a custom message and make sure that your best service technician gets a custom e-
mail message and an SMS message. The messaging could result in the sale of a replacement rooftop unit by your
company as you are armed with objective supporting data logs.
Space Zone Carbon Dioxide Level Alert
High CO2 levels indicate that ventilation systems are operating properly.
Your story
Your service client has noted perceived comfort issues and "stale air" in a major conference center, served by a rooftop
unit you service. You've installed a demand control ventilation control strategy for the rooftop unit, but one of the
employees in your customer's firm likes to change damper settings because he thinks it saves the boss energy. Your
customer, the boss, doesn't know that her employee is messing with the rooftop unit that you service, but you are going to
catch him!
NOTICE
Design considerations. You have determined that it will gets "stale" in the space when CO2 level exceeds
approximately 600 PPM CO2. As with the humidity example above, this drives the selection of the "alert limit."
Further, you want to make sure that you don't have excessive alert activity, so you should set alert hysteresis at 10
minutes. This means that the CO2 level needs to exceed 600 PPM for 10 minutes or longer. If the carbon dioxide
rises above 600 PPM and then fall below 600 PPM, the timer is reset. You can further create a custom message
and make sure that your best service technician gets a custom e-mail message and an SMS message indicating
that a CO2 level alert has occurred. Again, you can further create a custom message and make sure that your best
service technician gets a custom e-mail message and an SMS message. By definition, this technician will be
prepared to address the mischievous employee!
Differential Pressure Alerting, Filter Loading
High differential static pressure indicates that system filter is loaded and that filter needs to be replaced.
Your story
You have a maintenance contract with your customer to replace air filters. Your contract indicates that you replace the
filters four times a year. You intend to improve you service response to change filters when they need to, rather than to do
it on a fixed time basis. You will save truck rolls to service sites and you will make sure that your customer's equipment is
operating at peak efficiency.
NOTICE
Design considerations. You have determined that standard pressure drop across a clean evaporator coil and filter
is about 0.70 inches of water column. You've also determined by your filter and equipment manufacturer's
technical literature and advice that filters start to load with negative system consequences at about 0.75 inches of
water column. As with the humidity example above, this drives the selection of the "alert limit." Further, you want to
make sure that you don't have excessive alert activity, so you should set alert hysteresis at 120 minutes. This
means that the static pressure level needs to exceed 0.75 inches of water column for 120 minutes or longer. You
can create a custom message and make sure that your best service technician gets a custom e-mail message and
an SMS message indicating that a static pressure alert has occurred. This would present an opportunity to
reference the model number for filter media. You could also set a "pre alert" so that you have warning to order filter
media and schedule a service call.