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036-21478-001 Rev. A (0802)
How Meridian
The Meridian
control system converts single-zone con-
stant volume rooftop packaged or split system HVAC
units into variable air volume/variable temperature
multiple zone systems. The microprocessor based Zone
Manager calculates the heating and cooling require-
ments for each zone based on real time information re-
ceived from each Zone Controller/Damper. The Zone
Manager then directs the HVAC unit to provide the
appropriate amount of heating, cooling, and ventilation
to satisfy each zone's requirements. A bypass damper
controlled, by a static air pressure sensor, modulates
to maintain constant duct pressure.
The Meridian
system uses a unique 3 tier approach to
controlling the system:
•
Voting Zones
•
System Demand
•
Priority
This 3 tier system works in an integrated fashion to
maintain proper control of the equipment and effective
control of comfort in the zone.
Outside Air
Temperature
Sensor
Avoid Direct
Sunlight
24 VAC
AC Line
Ground
Network
Comm
Loop
Computer
(Optional)
24VAC
S yc
h ro
n o
u s
D at
a L
in
k
C
O
N
T
R
O
L
S
C O
C O
M M
M M
LI N
LI N
K II
K II
Remote Link
L
O
O
C
O
M
P
M
O
P
D
E
M
(Optional)
W
AT
TM
AS
TE
R
C
ON
TR
O
L
S,
I
NC
CommLink II
Figure 1-1: Meridian
Plus System Overview
Meridian
Systems
Works
Fan
Supply Air
Temperature
Sensor
Meridian Plus
+
+
Zone Manager
Typically Mounted
in the HVAC Unit
E D
a n
W
ri d
P M
M e
:3 8
0 3
P IE
ea
D
Ar
M S
/9 7
ind
C U
ow
A R
/0 1
O C
r W
A L
0 1
Cl
ea
N O
ES
C
ME
NU
3
2
6
1
To Other
5
R
4
9
EN
TE
8
R
-
CL
EA
7
US
MIN
Meridian Plus
0
C
DE
Zone Managers
24VAC
System Manager
First the zone must initiate a vote to the HVAC unit.
This occurs when a zone becomes more than 1 degree
off setpoint. At this time a vote is placed for heating or
cooling. Next the controller evaluates the total cooling
demand or heating demand within the entire building
to see which requirement is more critical. Finally, the
system looks for any priority conditions, which would
take precedence over other zones. All three of these el-
ements working together provide accurate and stable
control of comfort.
Additional control features are taken into account to
provide a very effective control of the system. Some of
these include priority override, supply air temperature
limits, outside air temperature lockouts, and min./max.
control over damper position.
Substantial savings can be realized using the Meridian
Zoning system instead of having to install multiple roof-
top units to accommodate multiple zone requirements.
The Meridian
Zoning system is versatile and can be
used with any packaged roof top unit or split system. It
controls a variety of terminal unit functions including
single duct pressure dependent, pressure independent,
series fan and parallel fan terminals.
H
C
Mixed
F
E
O
Air
I
A
O
L
T
L
T
I
I
E
N
N
R
G
G
Modulating
Bypass Damper
Static Pressure
Sensor & Pickup Tube
Zone Damper
Zone Controller
Local Communication Loop
r
g e
n a
M a
Zone #1
m
s te
S y
ar
m
Al
tio
n
ica
un
m
m
rid
e
Co
er
Temperature Sensor
Ov
Up To 16 Zones
24VAC
Zoning Design Guide
Outside Air
Exhaust Air
Return Air
Return Air
Sensor
Supply Air Duct
Zone Damper
Zone Controller
Meridian Plus
Zone Controllers
WARMER
NORMAL
OVR
COOLER
Zone #2
Temperature Sensor
With Override and Setpoint Adjust
To Other
5
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