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Introduction & Overview

A New Way to Look at Building Controls

Control Systems

036-33059-002 Rev. B (0602)

Introduction & Overview

Meridian Control Systems

2

036-33059-002 Rev. B(0602)

Table of Contents

Introduction .......................................................................................................................... 3

The Meridian Controls Concept ........................................................................................ 3

System Overviews

CV ................................................................................................................................... 4, 5

CV-EX.............................................................................................................................. 6, 7

Basic ................................................................................................................................ 8, 9

Plus ............................................................................................................................. 10, 11

Key Components Overviews

Central Operators Interface ............................................................................................... 12

Zone Managers ................................................................................................................. 12

Zone Controller & Round Damper ..................................................................................... 13

Rectangular Damper ........................................................................................................ 13

Rectangular Damper Kit .................................................................................................... 13

Constant Volume Controller............................................................................................... 14

Room Sensors ................................................................................................................... 14

CommLink II & Remote Link ............................................................................................. 15

Add On Devices................................................................................................................. 15

Communication Cable ....................................................................................................... 16

Computer Front End Software ...................................................................................... 16,17

Features & Benefits

All Systems ................................................................................................................... 18,19

Zoning Systems ................................................................................................................. 19

NOTE: Any reference in this document to roof top HVACunits are for ease of communication. Meridian can alsobe used on split systems.

Form: 036-33059-002 Rev. B (0602) Supersedes: 036-33059-002 Rev. A (0401)Copyright 2002 York International Corp..

Meridian is a registered trademark of York International Corp.York International Corp. assumes no responsibility for errors, or omissions.

This document is subject to change without notice.All rights reserved.


Introduction & Overview 3

036-33059-002 Rev. B(0602)

This provides two main benefits for the contractor, engi-neer, and end user:

• Advanced direct digital control technologyfor comfort and energy savings at up to50% lower cost than traditional directdigital control systems.

• A system that is simple to use allowingalmost any HVAC technician to installand start-up the system without the needfor specialized training.

Thank you for your interest in the York Meridian ControlSystem. This booklet was created to give you an overviewof the different systems and system components. TheMeridian is a new approach to providing simple, cost ef-fective, control solutions to many standard HVAC systems.Meridian provides a very competitive solution for build-ings which need more control than a programmable ther-mostat yet for which building automation systems are toocostly.

These systems come pre-engineered, pre-programmed,and fully documented.

Introduction

Meridian CVThis system is used in applications which only require thecontrol of single zone HVAC units, typically roof top units.The CV system can control up to thirty single zone, con-stant volume HVAC units. The Meridian CV is a superioralternative for buildings where multiple programmable ther-mostats would have normally been installed.

Meridian CV-EXThis system is used in applications which have more thanthirty single zone HVAC units. The CV-EX system can con-trol up to sixty single zone, constant volume HVAC units,and each loop expansion kit allows for thirty more singlezone HVAC units to be added to the system. A maximum oftwo loop expansion kits may be added to a CV-EX systemallowing for a total of up to 120 single zone HVAC units onthe system.

Meridian BasicThis system is used in applications where you have oneconstant volume HVAC unit and need to independently con-trol individual zones. The Basic system controls up to six-teen zones.

Meridian PlusThis system combines both multiple zone control and singlezone, constant volume control in one integrated system.You can control up to thirty zoned HVAC units with eachhaving up to sixteen zones. Plus, in addition to the zonecontrol, you can control up to a maximum of thirteen singlezone, constant volume units.

These four configurations can cover a broad range of build-ing types such as offices, retail stores, schools, manufac-turing facilities, and warehouses. Additional systems arebeing added in the near future to cover applications suchas VAV (Variable Air Volume).

How many HVAC projects do you see every week that es-sentially requires a standard control sequence? I mean,there is nothing unique about how most of the equipment isto be operated. So many projects basically fit into a stan-dard set of applications. However, many times these projectswind up with building automation systems which add sub-stantial cost to the project.

The reason building automation can be so expensive, evenfor the most simple HVAC systems, is because of the effortrequired to complete the project. When a controls contrac-tor uses building automation equipment, the time requiredto estimate the job, assemble all of the components required,write software, generate installation drawings, debug thesoftware, assemble documentation, etc., etc., etc., it addsa significant amount of cost to the project. When the costbecomes too great, many times the project has to be scaledback. Sometimes the building automation system is elimi-nated all together and standard electric or electronic con-trols are used. Unfortunately the end user loses many ben-efits that a building automation system can provide.

The Meridian System is a new approach in HVAC con-trols to provide engineers, contractors, and end users acontrol system with many of the benefits of building auto-mation without the high cost and complexity. Meridian isan Application Specific Control System. This means youorder a control system package, based on the application,which is ready to install and start up without the expenseand hassles normally associated with building automationsystems.

Meridian is currently offered in four system configurations.Depending on the building size, use or comfort require-ments, one of the four following systems is the best choice.The following information describes each system and itsuses and capabilities.

The Meridian Controls Concept


Introduction & Overview4

036-33059-002 Rev. B(0602)

CV System - Overview

The Meridian CV system is used in buildings which havemultiple rooftop units and is an excellent alternative overprogrammable thermostats. The CV system provides onecentral location to monitor and program the controllers in-stead of having to program each thermostat individually.The system has many features typically not found with pro-grammable thermostats such as: central operators inter-face, heating/cooling failure alarm, change filter alarm, fullenergy saving economizer control, and holiday scheduling.This gives the end user a very varsatile constant volumecontrol system at a price well below a building automationsystem.

Below are a few of the typical building applications the CVsystem is commonly used for.

• Office Buildings • Retail Stores

• Theaters • Supermarkets

• Manufacturing • Houses of Worship

• Schools • Warehouses

• Clinics • Restaurants

Typical Building For The CV System

CV System Applications



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CV System Features

Typical CV System

• CV system supports up to thirty constantvolume units. For systems with morethan thirty constant volume units, use theCV-EX system

• System Manager is housed in an attrac-tive, plastic enclosure suitable for wallmounting in the space and can beconnected anywhere in the communica-tions network

• Complete modulating economizer controlfunctions

• CommLink II interface included with thesystem. Provides connections for com-puter and Remote Link (modem) for on-site or remote communications. RemoteLink & personal computer are optional

• Trend Logging capability if connected to apersonal computer with free Prism,Windows based software installed

Computer(Optional)

CommLink IISingle Loop

CV ControllersUp to 30 Units with Standard CV System

RS-4859600 Baud

24VAC

110VAC

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Remote

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Remote Link(Optional)

NOTE: * Only One Outside Air Sensoris Required per CV-EX System

SupplyAir

Sensor

RS-485Comm Loop 24 VAC

Economizer(Actuator By Others)*Outside

AirSensor

Room Sensorwith Optional

Override & Adj.

F

Typical Constant Volume Unit

Generic AlarmDirty Filter Alarm

Shown

System Manager



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CV-EX System - Overview

The Meridian CV-EX system is used in buildings whichbecause of their size or design requirements, have morethan thirty rooftop units. Standard CV-EX systems can fa-cilitate up to sixty constant volume units. With the additionof a CV-EX Loop Expansion Kit an additional thirty unitsmay be added to the CV-EX system. Two loop expansionkits can be added to the CV-EX system bringing the maxi-mum total system capability up to 120 units. The versatileCV-EX system provides one central location to monitor andprogram the controllers instead of having to program indi-vidual thermostats. The system has many features typicallynot found with programmable thermostats such as: centraloperators interface, heating/cooling failure alarm, changefilter alarm, full energy saving economizer control, and holi-day scheduling.

Below are a few of the typical applications the CV-EX sys-tem is commonly used for.






Typical Building For The CV-EX System

CV-EX System Applications



036-33059-002 Rev. B(0602)

CV-EX System Features

Typical CV-EX System

• CV-EX system supports from thirty one toone hundred twenty constant volumeunits. For systems with thirty or lessconstant volume units, use the CVsystem

• System Manager is housed in an attrac-tive, plastic enclosure suitable for wallmounting in the space and can beconnected anywhere in the communica-tions network


• CommLink II interface included with thesystem. Provides connections for com-puter and Remote Link (modem) for onsite or remote communications. RemoteLink & computer are optional


Computer(Optional)

CommLink IIMultiple Loop

System Manager

CV Controllers

Up to 60 Units with CV-EX System and30 More per Expansion Kit Allowing

a Maximum of 120 Total Units on System

RS-4859600 Baud

CV-EX SystemExpansion Kit

CV-EX SystemExpansion Kit

NOTE: * Only One Outside Air Sensoris Required per CV-EX System

24VAC

Loop # 1MiniLink

Loop # 2MiniLink

Loop # 3MiniLink

Loop # 4MiniLink

Network Loop Local Loop

Local Loop

Local Loop

Loop #1

Loop #2

24VAC

24VAC

24VAC

24VAC

#1

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#1

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110VAC

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Loop #3

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SupplyAir

Sensor

RS-485Comm Loop 24 VAC

Economizer(Actuator By Others)*Outside

AirSensor


Override & Adj.

F

Typical Constant Volume Unit

Generic AlarmDirty Filter Alarm

Shown



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Basic System - Overview

Typical Building For The Basic System

Basic System Applications

The Meridian Basic system is used in buildings which haveonly one constant volume HVAC unit and the need to pro-vide independent comfort to individual zones. Zoning con-verts a constant volume HVAC unit to supply variable vol-ume and variable temperature air only to the zones thatneed it at the particular time. This typically allows the HVACunit to be downsized because peak loads vary throughoutthe building and normally only a few of the total number ofzones are requiring conditioned air to satisfy comfort lev-els at the same time. The Basic system controls up to 16individual zones. In addition this system like the CV & CV-EX also allows many additional features, such as: heat-ing/cooling failure alarm, change filter alarm, full energysaving economizer control, and holiday scheduling.

Below are a few of the typical applications the Basic sys-tem is commonly used for.


• Theaters • Houses of Worship


The Zone Manager is housed in a aluminum metal enclo-sure and has a keypad and display to allow complete pro-gramming and status monitoring. Nine individual LED’s arealso provided for visual confirmation of key system opera-tional functions.



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(Optional)

Computer(Optional)

Zone Air DampersUp to 16 Zone Air Dampers Allowed

RS-4859600 Baud

SupplyAir TempSensor

To HVAC UnitControl Panel

ReturnAir TempSensor

Bypass AirDamper

Economizer(Actuator By Others)

OutsideAir TempSensor

StaticPressureSensor

24VAC

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Velocity Sensor(Optional)

Zone Controller

Damper Actuator

RS-485Comm Loop

24 VAC


Override & Adj.

Typical Zone

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Basic System Features

Typical Basic System

• System will support up to 16 independentzone controllers


• Zone Manager housed in control enclo-sure with keypad and display. StatusLED’s for Fan, Cooling, Heating, Bypass,Communications and Alarms

• Bypass Damper for duct pressure controlcan be configured for direct or reverseacting operation.

• Contact output for exhaust/relief fan(s).Digital input for change filter alarm.

• Optional CommLink II interface providesconnections for personal computer andRemote Link (modem) for on site orremote communications. Remote Link &personal computer are optional




036-33059-002 Rev. B(0602)

Typical Building For The Plus System

Plus System Applications

Plus System - Overview

The Meridian Plus system is used in buildings which haveone or more HVAC units requiring zoning and also requirecontrol of single zone constant volume HVAC units. Thezoning control features of the Plus system are identical tothe Basic system, allowing up to 16 individual zones to becontrolled by each HVAC unit, Zone Manager controller. Inaddition, this system also will allow control of up to thirteenconstant volume single zone units per each zoned HVACunit on the system. All HVAC units on the system are tiedtogether through a communications network that providesfor central point programming and monitoring from the Sys-tem Manager operators interface A personal computer withthe free Prism, Windows based software installed, canalso be used . Up to thirty Zone Managers, each capable

of controlling up to sixteen zones and up to thirteen CVcontrollers, can be interconnected with this system.

Below are a few of the typical building applications the Plussystem is commonly used for.








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Computer(Optional)

ZoneManager

ZoneManager

RS-4859600 Baud



To HVAC Unit #1Control Panel



Bypass AirDamper

Bypass AirDamper

Economizer(Actuator By Others)

OutsideAir TempSensor



Typical Zone

Constant Volume UnitsUp to 13 CV Units May Be added To

Each Zone Manager Loop

System Manager

Local Loop

Local Loop

Network Loop

24VAC

24VAC



#1

#1

#18

#16

#16

#30


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110VAC

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To Other ZoneManagers & HVAC Units

(Up To 30 Per System)

To HVAC Unit #2Control Panel

Velocity Sensor(Optional)

Zone Controller

Damper Actuator

RS-485Comm Loop

24 VAC


Override & Adj.

AIRFLO

W AIRFLOW

Plus System Features

Typical Plus System

• Each Zone Manager will support up tosixteen independent zone controllersand up to thirteen CV controllers


• System Manager, central operatorsinterface, is housed in an attractive,plastic enclosure suitable for wall mount-ing in the space

• Bypass Damper for duct pressurecontrol, can be configured for direct orreverse acting operation

• Contact output for exhaust/relief fan(s).Digital input for change filter alarm.

• Standard CommLink II interface providesconnections for personal computer andRemote Link (modem) for on site orremote communications. Remote Link &personal computer are optional




036-33059-002 Rev. B(0602)

System Manager - CV/CV-EX & Plus

Central Operators Interfaces

The Meridian systems utilize two different central opera-tors interfaces. The Zone Manager, used for the Basic sys-tem, is mounted in an aluminum enclosure with keypadand display mounted on the front. It is designed for wallmounting in the equipment room or other similar space or itcan be mounted to the casing of an indoor HVAC unit ifdesired. The Zone Manager is not suitable for outdoormounting. The Meridian CV, CV-EX and Plus systemsutilize the System Manager as the central operators inter-face. The System Manager has a plastic enclosure withkeypad and display. The System Manager is designed forindoor wall mounting. The pleasing color scheme and de-sign of the System Manager make it suitable for wall mount-ing with virtually any room decor.

Features of the both central operators interfaces include:

• Access and Programming to the EntireSystem

• Access is Password Protected

• Maintenance Free Keypads

• 4 Line by 20 Character Easy to ReadDisplay

• Backlighted Display is Easy to ReadEven in Low Light Environments

• Status LED’s

Key Components - Overview

Zone Manager - Basic

Zone Managers

Zone Manager - BasicZone Manager - Plus

The Zone Manager is the “master controller” for the Basic& Plus zone control functions. The Zone Manager calcu-lates the heating and cooling requirements for each zonebased on real time information received over the networkfrom the Zone Controllers. The Zone Manager then directsthe HVAC unit to provide the appropriate amount of heat-ing, cooling, and ventilation to satisfy each zone’s require-ments. The Zone Manager also controls economizer andstatic pressure/bypass damper functions.

The Basic system Zone Manager comes mounted in anenclosure with a keypad & display. The Zone Manager forthe Plus system comes mounted on a backplate for mount-ing in the HVAC unit or remotely.

Both Zone Managers include these features:

• Controls two stages each of heating &cooling. The Plus system is capableof expanding to six stage control with theoptional staging expansion board

• 0-10 VDC economizer output and contactoutput for exhaust/relief fan(s)

• Bypass damper/static pressure control

• Digital input for change filter alarm

• On board time clock for scheduling/nightsetback functions



036-33059-002 Rev. B(0602)

Zone Controller With Round Damper

Zone Controller With Round Damper Assembly

Rectangular DamperRectangular Damper Kit

The Zone Controller monitors the space temperature andallocates the proper air flow into its assigned space toachieve desired comfort and ventilation levels. The zonecontroller modulates the actuator motor to move the rounddamper blade to the correct position to maintain the requiredairflow.

Zone Controller & Round Damper Features:

• Modular plug-in connections for actuator,flow sensor, & optional auxiliary relayboard

• Reduces installation time

• Eliminates potential wiring errors

• Both Pressure Dependent and Indepen-dent Control available from the samecontroller

• Optional relay board for control ofauxiliary heat and series or parallel fanboxes

• Damper comes factory insulated reduc-ing labor cost in the field

• Controller automatically recognizespresence of flow sensor and auxiliaryrelay board at system power up andautomatically configures controller toaddress those functions

• Heavy duty, high reliability actuator withreal-time feedback

• Diagnostic LED’s verify proper operation

• Heavy gauge metal round damperhousing and damper blade

Zone Controller With Rectangular Damper

The Rectangular Damper is used in applications whererectangular duct is specified or required because of spacelimitations or job requirements. The Rectangular Damperutilizes opposed blades of airfoil design for improved airflow control. Damper frame, blades and linkage are madeof extruded aluminum. The Zone Controller and actuatorare mounted in the rectangular damper kit. The Rectangu-lar Damper Kit has a sheet metal enclosure and is designedfor easy over the shaft mounting to the rectangular damper.

Rectangular Dampers feature:

• Damper frame, blades and linkage aremade of extruded aluminum

• Blade pins are 7/16” hexagon shapedaluminum, fixed to a Celcon innerbearing that rotates within a polycarbon-ate outer bearing inserted in the damperframe

• Damper linkage is mechanically as-sembled and located in the damperframe

• Blade gaskets are of extruded EPDMmaterial which are secured within anintegral slot on the blade. Jamb seals areof extruded TPE material for low leakagethrough the damper when closed



036-33059-002 Rev. B(0602)

CV Controller

The CV Controller is used in both the Meridian Plus, CVand CV-EX systems. It is designed to control a single zoneconstant volume unit. The controller can be mounted in thecontrol panel of the roof top unit or remotely.

CV Controllers Feature:

• Four configurable relay outputs forheating/cooling control

• Economizer output 0-10 VDC

• Digital input for change filter alarm

• On board time clock for scheduling/nightsetback functions

• Unique alarming feature notifies you ofheating or cooling failures


CV Controller Board

Room Sensors

Room Sensor Options

The flush mount Room Sensor comes in an attractive, offwhite color suitable with most any decor. The sensor canbe painted or wall papered without affecting performance.

The patented design provides accurate sensing of roomtemperature with the benefit of a tamper proof package.

The design of the sensors allow them to be mounted verti-cally in a standard 2 x 4 handy electrical box. Where electri-cal codes do not require low voltage wiring to be enclosedin conduit, they may be mounted directly into the drywall. Atemplate is provided with the sensors to facilitate cutting ofthe correct size hole for mounting.

The sensor comes in four different configurations:

• Sensor Only

• Sensor with override

• Sensor with setpoint adjustment

• Sensor with override & setpoint adjust-ment

Setpoint adjustment affect can be programmed ±0-5°F fromthe central operators interface.



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CommLink II & Remote Link

CommLink II

Add On Device Boards

The CommLink II communications interface acts as a net-work hub for token passing on the system communicationsloop. It also handles alarm gathering for remote callout. TheCommLink has connections for both computer and the Re-mote Link modem.

The CommLink is included with the Meridian CV, CV-EXand Plus Systems. It is optional for the Basic system and isonly required if the system requires remote alarm calloutor is to be connected locally or remotely to a personal com-

puter for use with the Prism, Windows based software.

The optional Remote Link is a specialized 14,400 baud mo-dem that is used in conjunction with the CommLink inter-face to allow for remote alarm callout or remote connectionof a personal computer. It connects to the CommLink II viaa serial data cable. A telephone line connects the RemoteLink to the local phone service.

Add On Devices

Various Add On Devices are available in addition to the stan-dard controllers previously described. Listed below are thevarious devices available.

CV-C Controller. The CV-C Controller is a field configurableConstant Volume controller for single zone applicationswhere additional capability is required beyond the standardfunctions of the CV controller. The CV-C can be configuredfor applications for CO2/IAQ economizer control, dehumidi-fication, modulating of HW and CW control valves. The CV-C digital outputs can be expanded via a plug-in expansionboard from applications requiring additional staging controlof heating and cooling.

General Purpose Controller. The GPC has (5) UniversalInputs that can accept a contact closure, thermistor tem-perature sensors, or 4-20mA/2-10VDC signal. The control-ler has (5) digital outputs for on/off control and (1) analogoutput to modulate a valve or damper. These inputs andoutputs can be configured in a variety of ways using And/Orlogic functions, time schedules, setpoints, etc., to performmany different tasks.

The GPC can be used for many applications including, butnot limited to:

• Control Unit Heaters • Control Boilers

• Control Exhaust Fans • Monitor Temperature

• Monitor Humidity • Monitor Status Contacts

Optimal Start Scheduler. Provides expanded schedulingcapabilities beyond those incorporated with the standardsystems. Scheduler provides for optimal, Start/Stop and upto (7) independent schedules with 2 Start/Stop events perday and (14) Start/Stop holiday events per schedule.

Lighting Panel Controller. Adds Lighting Control Capabil-ity to the system. The controller provides up to (7) Indepen-dent time schedules and light level controls.

Wetbulb Module. Provides wetbulb temperature monitor-ing for control of all economizer equipped units on all of thesystems.

Remote Link



036-33059-002 Rev. B(0602)

Communications Cables

Imagine This Common Dilemma:

The contractor is at the job site looking up at the ceiling.There are cables strung everywhere…. cables for alarms,speakers, computers, control systems, etc.. These cablesall look the same, except for the Meridian communicationcables. These are easily recognizable because of the colorcoding and labeling printed on the cable. The labeled andcolor coded communication cable is an enhancement thatmakes the contractors job easier. Pre-marked and colorcoded cables save the contractor expensive wire tracingand troubleshooting time.

In keeping with our philosophy of making Meridian sys-tems simple to install, we have developed Meridian Com-munication Cables that make the installer’s job even easier!This new cable meets the specifications of our recom-mended Belden #82760 cable but has a very unique fea-ture. The cables are color coded and labeled for both theNetwork Loop and Local Loop!

You may ask - Why is that important? In both the Meridian

Plus and CV-EX Systems, two types of communicationloops are required.

Network Loop. This Loop originates at the CommLink andinterconnects the MiniLink Network cards for each of theZone and/or CV Controller loops. MiniLinks are suppliedfactory mounted on the Zone Mangers for the Plus System.In the CV-EX System, MiniLinks are mounted on a backplate.The Network Loop cable comes in 500 foot spools.

Local Loop. This is always the communications loop towhich the individual Zone Controllers, System Manager, CVControllers and any other controllers (GPC, Optimal StartScheduler, Lighting Panel) are connected. The Local Loopcable comes in 1000 foot spools.

Color coded cables help the installer keep the two commu-nication cables separate and identifies the cable, during in-stallation and after, as being installed for the Meridian

Systems. Even when installing the Meridian Basic andCV Systems, where there is only one communication loop,color coded cable can be beneficial to a quality installation.In addition, making the color coding part of the controlsspecification can add additional cost to your competitorsbid by requiring them to locate nonstandard cable to meetthe specifications.


Network & Local Loop Communications Cables

Computer Front End Software

The Prism, Windows based software is an easy to usegraphical user interface for the. The Meridian family ofsystems. The Prism software has many features typicallyfound in only expensive building automation software pack-ages such as:

• Software is FREE when ordered with asystem

• Very easy to use

• Color graphic status screens

• Password Access (9 Levels)

• User definable passcode levels for everyavailable setpoint

• Trend logging using Excel™ compatiblespreadsheets

• Graphics editor for drawing custom floorplans, etc.

• English language descriptors for allcontrol points

• Alarm reporting

• Dial in/out to multiple installations

• User friendly navigation

• Built in text editor for viewing all historylogs, etc.

• History logging of users actions

• Current status printouts

• Alarm callout from remote locations

See the adjoining page for various sample screens fromthe Prism computer front end software package.



036-33059-002 Rev. B(0602)

Computer Front End Software

Holiday Scheduling

Custom Graphics - Typical Screen Alarm Logging

Daily Sheduling Trend Logging

Zone Manager/Zone Controller Status



036-33059-002 Rev. B(0602)

All Systems

Non-ProprietaryMeridian will work on any manufacturers HVAC equipmentthat will accept a standard thermostat connection. This pro-tects the end user from being locked in to one source forservice and support. In addition, Meridian Systems includevery comprehensive documentation, which was written ina format specifically for a “non-controls technician”. Becausethe manuals are so user friendly, it prevents the end userfrom being “locked-in” to one contractor for service. Anynew contractor needs only a copy of the system manual tohave as much technical information as any previous con-tractor.

Pre-engineered & Application SpecificSystem design, software, and documentation has alreadybeen done for you. This eliminates the costly expense usu-ally associated with conventional DDC systems, makingthe Meridian system more competitive and easier to in-stall and operate.

One System for both Zoned & Single Zone SystemsNot only does Meridian provide a networked control sys-tem for one or multiple zoned HVAC units, but also allowsconnection of individual single zone units to the system,eliminating the need to use programmable thermostats.

Easy to ConfigureSince Meridian components are grouped into packages,configuring a system has been simplified. This reduces thechance of ordering errors and makes system layout effort-less!

User Friendly Set UpSince the Meridian comes with menu driven, fill in the blankprogramming, system setup is simple. The system manualtakes you step by step through the set up process. Defaultparameter values are programmed into permanent memoryso the system can be operational at start-up. Specializedtraining is not required.

True Network CommunicationsThe Meridian uses a three wire, RS-485 loop for commu-nication between all controllers in the system. This pro-vides a very reliable form of communication with flexibilityof installation. The loop can be wired in a “daisy chain” or“star” configuration. Many other zoning systems utilize “homerun” wiring that requires all communication cables to bebrought back to a central point adding additional cost to theproject and complicating wiring.

High Integrity CommunicationsMany communicating control systems are susceptible toelectrical interference. One major manufacturer of zoningsystems recommends that their communication cableshould not be strapped to conduit because of potential in-

terference. The Meridian Systems have a communicationbus that is almost immune to any noise problems that maybe found in commercial facilities.

Microprocessor ControllersAll controllers in the Meridian system have an on boardmicroprocessor. This is what gives the Meridian systemits powerful features and capabilities not found in other sys-tems.

Stand Alone SystemsAll Meridian Systems are true stand-alone. A computer isnot required for operation. Controllers maintain their own7-day time clock, 365-day holiday scheduling, and setpoints.

Operators’ InterfaceAll Meridian systems have an operators’ keypad and dis-play terminal. This gives you access to all system statusand parameter values without the need for a computer. The4 line by 20 character display is backlighted making it easyto read even in low light environments.

Memory BackupInstead of batteries, which have to be replaced, Meridian

controllers utilize super capacitors to provide power formemory backup during power outages. The major advan-tages to this approach is that super capacitors are morereliable than batteries and they recharge in a matter of sec-onds instead of hours. Typical memory backup is good fora minimum of 10 days.

Heavy Duty Actuators with Real Time FeedbackAll Meridian system actuators utilize true modulating con-trol unlike many systems, which are two position. This givesthe system improved control which translates to better com-fort levels. Our actuators are also rated for 2-½ million cyclesmaking our actuators some of the most reliable in the in-dustry. One other critical feature is the real time feedback.Many other systems have no feedback at all. They blindlyestimate the travel time of their actuator, which, in the realworld, is not a very repeatable estimate. To help correctthe problems inherent with this approach, they recycle allthe actuators in the system once or twice a day. They maysave a few dollars by not including feedback but they sac-rifice system performance. Not so with Meridian.

Patented Room SensorsOur flush mount room sensors are so unique, they are pat-ented (U.S. Patent No. 4,659,236). Even though part of thesensor is recessed into the wall to provide an attractive yettamper proof flush mounting, internal wall temperatures donot influence the sensor. A special plate on the face of thesensor accurately senses space temperature. Even thoughthe attractive off white plastic housing is a preferred color,the sensor housing can be painted or wallpapered to blend

Features & Benefits



036-33059-002 Rev. B(0602)

with room decor without affecting sensor performance. Thesensors are offered in four different configurations:

• Sensor Only

• Sensor with override

• Sensor with setpoint adjustment

• Sensor with override & setpoint adjustment

Modular ConnectionsMany Meridian auxiliary devices are connected to the con-trollers via modular plugs like the ones used on telephones.This simplifies installation and eliminates the possibility ofwiring errors. The devices, which utilize this method, aredamper actuators for zone and bypass control, auxiliaryrelay boards, and static pressure/air flow sensors. There isone interesting side note about the auxiliary relay board andairflow sensors. These devices are typically used on thezone controllers in the Meridian Basic & Plus systems.When the system is powered up, it automatically looks tosee if these devices are connected to the controller. If theyare, the controller automatically reconfigures itself to uti-lize these devices and activates the appropriate set upscreens back at the operators interface. Pretty neat don’tyou think!FREE! Windows based Color Graphics SoftwareEach Meridian system can be monitored on site or re-

motely using a PC and our Meridian Windows basedsoftware. This full-featured package is very user friendlyand can be used to monitor one system or hundreds.Meridian is not copy protected so it can be installed onmultiple PC’s’ without additional expense. Just some of itsmany features include but not limited to:

• Pre-designed status screens for allcontrollers

• Alarm dial out capability

• Programming of all system parameters

• Trend logging to Excel™ spreadsheets

• Alarm Handling

• Custom graphics capability

Open ProtocolMeridian is an open protocol based system allowing othermanufacturers to develop direct interfaces to the commu-nications loop. This gives you the ability to integrate theMeridian system into products from other vendors. Ourengineering staff will be glad to assist any vendor in thisprocess.

Zoning Systems

All Systems

In addition to the features already mentioned, the Basic &Plus systems zoning features include:

• Pressure Dependent and PressureIndependent zone operation from thesame controller

• Pressure Independent control is auto-matically detected by the Zone Managerupon start up. System automaticallydisplays appropriate setpoints and statusscreens

• Bypass Damper actuator can be softwareselected for direct or reverse actingoperation

• Zone Manager controls up to two stageseach of heating and cooling. An optionalexpansion board provides control for upto six stages each

• Room sensor slide adjustment effect canbe programmed from ±0°F to 5°F.

• Global and individual zone overridemodes

• Basic & Plus systems have manualairflow/damper force modes available fortroubleshooting or air balancing pur-poses

• Zones can be programmed for VOTINGor NONVOTING status which allows theuser to eliminate troubled zones from theZone Managers decision process

NormanOK

73069

Subject to change without notice. Printed in U.S.A.

Copyright by Unitary Products Group 2002. All rights reserved.

UnitaryProductsGroup

5005YorkDrive

036-33059-002 Rev. B (0602)

Supersedes: 036-33059-002 Rev. A (0401)

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