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036-21478-001 Rev. A (0802)
True Network Communications
The Meridian
uses a three wire, RS-485 loop for com-
munication between all controllers in the system. This
provides a very reliable form of communication with
flexibility of installation. The loop can be wired in a
"daisy chain" or "star" configuration. Many other zon-
ing systems utilize "home run" wiring that requires all
communication cables to be brought back to a central
point adding additional cost to the project and compli-
cating wiring.
High Integrity Communications
Many communicating control systems are susceptible
to electrical interference. One major manufacturer of
zoning systems recommends that their communication
cable should not be strapped to conduit because of po-
tential interference. The Meridian
munication bus that is almost immune to any noise prob-
lems that may be found in most commercial facilities.
Microprocessor Controllers
All controllers in the Meridian
board microprocessor. This is what gives the Meridian
powerful features and capabilities not found in other
systems.
Stand-Alone Systems
All Meridian
Systems are true stand-alone and do not
require a computer to operate. Unit controllers main-
tain their own 7 day time clock, 365 day holiday sched-
uling, and setpoints within each controller.
Menu Driven Operators' Interface
All Meridian
systems have an operators' keypad and
display terminal. This gives you access to system sta-
tus and parameter values without the need for a com-
puter. The 4 line by 20 character display is backlighted
making it easy to read even in low light environments.
Menu driven programming makes the system extremely
user friendly. In addition, the interface panel is pass-
word protected to keep unauthorized users from access-
ing the system.
Communications Via Optional Modem
The Remote Link is used for achieving remote commu-
nications with the Meridian
CommLink II communications interface and a local
phone line. With the Remote Link, the Meridian
Meridian
Systems
Systems have a com-
system have an on-
system. It connects to the
sys-
tem can be monitored and controlled from a remote lo-
cation, using a computer and the Prism
end software package.
Memory Backup
Instead of batteries, which have to be replaced,
Meridian
utilizes super capacitors to provide power
for memory backup during power outages. The major
advantages to this approach is that super capacitors are
more reliable than batteries and they recharge in a mat-
ter of seconds instead of hours. Typical memory backup
is good for a minimum of 10 days.
Modulating, Heavy Duty Actuators with
Real Time Feedback
All Meridian
actuators utilize true modulating con-
trol unlike many systems, which are two position. This
gives the system-improved control, which translates, to
better comfort levels. Our actuators are also rated for
2-½ million cycles, making our actuators some of the
most reliable in the industry. One other critical feature
is the real time feedback. Many other systems have no
feedback at all. They blindly estimate the travel time of
their actuator, which, in the real world, is not a very
repeatable estimate. To help correct the problems in-
herent with this approach, they recycle all the actuators
in the system once or twice a day. They may save a few
dollars by not including feedback but they sacrifice sys-
tem performance. Not so with Meridian
Commercial Grade – Insulated Round
Zone Dampers
Meridian
only uses commercial grade zone dampers,
not cheap, flimsy, "light commercial" or "residential"
style dampers like many other manufacturers. Our round
damper is ARI certified and comes from the factory fully
insulated. Why? When many zone dampers are installed
they are improperly insulated or not insulated at all.
This can cause problems with the damper "sweating"
from condensation. With factory insulated zone damp-
ers, we eliminate a common problem for the contractor
while insuring the end user will not have problems with
condensation dripping down onto the ceiling.
Rectangular Dampers
Meridian
uses only top of the line, aluminum air foil
rectangular control dampers. No other zone system on
the market today utilizes a damper of this quality and
performance!
Zoning Design Guide
computer front
.
7
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