York EZ Zone Installation and operation manual

FAN
COOL 1
COOL 2
HEAT 1
HEAT 2
BYPASS OPEN
BYPASS CLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C=HVAC UNIT/CLEAR
D = ALARMS
# = STEP/ENTER
*
= DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
Clear Window Area
6
5
4
DEC
7
MINUS
0
CLEAR
98
132
MENU
Override
Communication
ENTER
ESC
Alarm
System Manager
-
Meridian Plus
05/17/00 03:38PM WED
OCCUPIED
NO ALARMS
Heating and Air Conditioning
®
FAN
COOL 1
COOL 2
HEAT 1
HEAT 2
BYPASS OPEN
BYPASS CLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C = HVAC UNIT/CLEAR
D = ALARMS
# = STEP/ENTER
*
= DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
EZ ZoneEZ Zone
EZ ZoneEZ Zone
EZ Zone
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TT
Too
oo
o
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UpgUpg
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GuideGuide
GuideGuide
Guide
036-21423-001 Rev. A (0602)

EZ Zone/Meridian
2Upgrade
036-21423-001 Rev. A (0602)
Form: 036-21423-001 Rev. A (0602) Supersedes: Nothing
Copyright 2002 York International Corp..
Meridianis a registered trademarkof York International Corp.
York International Corp. assumes no responsibility for errors, or omissions.
This document is subject to change without notice.
All rights reserved.

EZ Zone/Meridian
Upgrade 3
036-21423-001 Rev. A (0602)
Table of Contents
Introduction ........................................................................................................................................ 4
EZ Zone Upgrade Overview.............................................................................................................. 5
Component Descriptions.................................................................................................................... 6
Upgrade Package Selection................................................................................................................ 7
Example #1 - EZ Zone Stand Alone To Meridian Basic ..........................................................8 & 9
Example #2 - EZ Zone Stand Alone To Meridian Plus ........................................................ 10 & 11
Example #3 - Networked EZ Zone To Meridian Plus ..........................................................12 & 13
Optional Controllers And Accessories...................................................................................14 & 15
EZ Zone Wiring ................................................................................................................................ 16
Meridian Basic Wiring..................................................................................................................... 17
Meridian Plus Wiring....................................................................................................................... 18
Meridian Plus Address Switches..................................................................................................... 19
HVAC Staging Connections............................................................................................................. 20
Sensor Connections .......................................................................................................................... 21
Bypass Damper Connections ........................................................................................................... 22
Honeywell Economizer Actuators................................................................................................... 23
System Manager Installation........................................................................................................... 24
CommLink II Installation................................................................................................................ 25
Modem Linc Central EPROM Replacement ................................................................................ 26
Master Interface EPROM Replacement ........................................................................................ 27
Zone Controller EPROM Replacement.......................................................................................... 28
EPROM Installation Procedures..................................................................................................... 29
Ribbon Cable Installation................................................................................................................ 30
Upgrade Parts List Summary.......................................................................................................... 31
Table of Figures
Figure 1: Existing EZ Zone Master Controller Wiring ................................................................ 16
Figure 2: New Meridian Basic Controller Wiring......................................................................... 17
Figure 3: Existing Meridian Plus Controller Wiring .................................................................... 18
Figure 4: New Meridian Plus Address Switch Setting .................................................................. 19
Figure 5: Existing EZ Zone HVAC Wiring .................................................................................... 20
Figure 6: New Meridian HVAC Wiring.......................................................................................... 20
Figure 7: Existing EZ Zone Master Controller Sensor Wiring.................................................... 21
Figure 8: New Meridian Zone Manager Sensor Wiring ............................................................... 21
Figure 9: Existing EZ Zone Bypass Damper Wiring .................................................................... 22
Figure 10: New Meridian Bypass Damper Wiring ........................................................................ 22
Figure 11: Honeywell Economizer Actuators Wiring Information.............................................. 23
Figure 12: System Manager Wiring................................................................................................24
Figure 13: CommLink II Wiring..................................................................................................... 25
Figure 14: EZ Zone Modem Linc Central EPROM Location...................................................... 26
Figure 15: EZ Zone Master Interface Board EPROM Location ................................................. 27
Figure 16: EZ Zone Zone Controller EPROM Location .............................................................. 28
Figure 17: EPROM Removal & Installation.................................................................................. 29
Figure 18: 3 Connector Ribbon Cable Installation ....................................................................... 30

EZ Zone/Meridian
4Upgrade
036-21423-001 Rev. A (0602)
The York International Corporation’s EZ Zone Controls
System was first introduced in the early nineties. The
EZ Zone Controls System was designed for York, by
WattMaster Controls, as a simple zone control system
for York’s line of commercial unitary roof top and split
system HVAC units. Since its original design and in-
troduction, the York EZ Zone Control System has
changed very little.
Introduction
FAN
COOL 1
COOL 2
HEAT 1
HEAT 2
BYPASS OPEN
BYPASS CLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C = HVAC UNIT/CLEAR
D = ALARMS
# = STEP/ENTER
*
= DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
The Meridian Controls System was created from the
original EZ Zone Control System concept by redesign-
ing, enhancing and expanding the original systems ca-
pabilities under the new Meridian Controls System
name.
York’s Meridian Control Systems have continued in the
York EZ Zone tradition of keeping the controls simple
to install and use while enhancing the system to make it
more applicable and in line with the needs of the cur-
rent marketplace. In addition to offering an excellent
control system for zoning applications, the Meridian
Control System has been expanded to allow control of
multiple single zone constant volume units and other
devices such as lighting, exhaust fans, and unit heaters.
Upgrading your EZ Zone system to the Meridian Con-
trols system allows you and your customer to take ad-
vantageof the many improvements that have been made
in the Meridian Controls system without having to re-
place all the EZ Zone system components that are in-
stalled on your job.
This guide is intended to provide you with simple
instructions on upgrading an existing EZ Zone system
to a Meridian Control System.
Clear Window Area
6
5
4
DEC
7
MINUS
0
CLEAR
98
132
MENU
Override
Communication
ENTER
ESC
Alarm
System Manager
-
Meridian Plus
05/17/00 03:38PM WED
OCCUPIED
NO ALARMS
Heating and Air Conditioning
®

EZ Zone/Meridian
Upgrade 5
036-21423-001 Rev. A (0602)
The basic steps required to upgrade your EZ
Zone system to a Meridian system are:
Determine what EZ Zone components
are currently installed on the system.
Replace the existing EZ-Zone Master
Controller board with an Meridian
Zone Manager controller board
Replace the existing EZ Zone
EPROM’s in each Zone Controller
with a new Meridian EPROM.
Install return air and outside air
temperature sensors
EZ Zone to Meridian upgrade allows you to
retain:
All existing wiring
Master Controller enclosure with
keypad and display
Existing supply air and static pressure
sensors
Existing bypass damper
All Zone Dampers
* All Zone Controllers
Room sensors
* Modem Linc Central
* All Master Interface Boards
All Fan Terminal Controllers
EZ Zone Upgrade Overview
After upgrading your system from EZ Zone to
Meridian, you will be able to take advantage
of many new enhancements including:
Damper actuators can be programmed
for direct or reverse operation
Full modulating economizer control
capability including optional wetbulb
economizer control
Outside air temperature sensor provides
lockout function for both heating and
cooling. When converted to Meridian
Plus system only one outside air sensor
is required for the entire system
Contact closure input for dirty filter
status
Global and individual zone override
modes
Zones can be set for voting or
nonvoting status
Room sensor slide can be programmed
± 0° F to ± 5° F adjustment
from setpoint
Staging delays, minimum off times,
and changeover intervals are
programmable
Sensor offset calibration to correct
sensor errors due to poor location
MeridianView enhanced graphical
computer front end software available
when CommLink and a PC are used
System Manager operator interface
allows all controllers to be accessed from
one central location
* These controllers can be retained but they will re-
quire an EPROM chip upgrade to be compatible
with the Meridian System.

EZ Zone/Meridian
6Upgrade
036-21423-001 Rev. A (0602)
Component Descriptions
The general architecture of the EZ Zone and the Merid-
ian Systems are very similar making the upgrade pro-
cess relatively easy.
There are some changes in the component descriptions
between the EZ Zone system and the Meridian system.
It is important to understand these differences before
you begin the upgrade process.
Many of these components look similar, however, in
some cases they do not function in an identical fashion.
Having the wrong component installed can cause im-
proper system operation.
The chart below depicts the difference in descriptions
for the various comparable system components in the
EZ Zone and Meridian Systems.
Master Controller Zone Manager
Fan Terminal
Controller
Master Interface Board
MiniLink
Communications
Interface
Modem Linc Central CommLink II
Zone Controller Zone Controller
EZ Zone Components
Meridian Components
Relay Expansion
Board
Must Be Replaced Improved Hardware & Software
Replacement Not Required
EPROM Replacement Require
d
EPROM Replacement Require
d
EPROM Replacement Require
d
Same As Existing Fan Terminal Controlle
r
Improved Software
Improved Software
Improved Software

EZ Zone/Meridian
Upgrade 7
036-21423-001 Rev. A (0602)
Upgrade Package Selection
There are basically 3 possible EZ Zone to Meridian
upgrade scenarios you may encounter. We have out-
lined these below to assist you in deciding which op-
tion is best for your application.
Please see the Meridian upgrade selection chart below
to help determine which example best fits your needs.
Upgrade A Simple EZ Zone Stand Alone
System(s) To The Meridian Basic System
•Each Existing Master Controller Has It’s Own Display
And Keypad And Is Treated As A Separate System
•No Communications Cable Between Existing Master
Controllers
•No Central Display Or Computer Interface Is Desired
See Example #1
On
Pages 8 & 9
See Example #2
On
Pages 10 & 11
See Example #3
On
Pages 12 & 13
Upgrade A Simple EZ Zone Stand Alone
System(s) To The Meridian Plus System
•Two Or More Existing Master Controllers On The Job.
•No Communications Cable Between Existing Master
Controllers
•The Customer Wants To Connect The Master
Controllers So That They Are Part Of A Networked
System And/Or Install Constant Volume Unit
Controllers Or Other Controller Boards On Their
System
Upgrade A Networked EZ Zone System To
The Meridian Plus System
•Two Or More Existing Master Controllers That Are
Networked Together With A Modem Linc Central
•The Customer May Want To Add Constant Volume
Unit Controllers Or Other Controller Boards To Their
System

EZ Zone/Meridian
8Upgrade
036-21423-001 Rev. A (0602)
Example #1:
Your project has a single EZ Zone Master Panel and
it’s associated Zone Controllers. This is a typical EZ
Zone system. The upgrade will essentially convert this
to a Meridian Basic System. Please see the required
upgrade components to be ordered in the list below.
To upgrade your existing EZ Zone System to the Me-
ridian Basic System the following procedure will be
required.
Warning:All removal and installation procedures
must be done with the power to the controllers
turned off. Failure to do so can cause severe dam-
age to the controller boards.
1) All power and input/output wiring will need to be
disconnected from the board. Remove the enclosure
cover and disconnect the keypad & display cable by
unplugging the cable connector at the board connec-
tion.
2) The new Return Air Sensor should be installed in
the return air stream in a location upstream of the point
that the bypass duct connects to the return duct.
3) Install the new Outdoor Air Sensor in a location on
the exterior of the building that provides shade and pro-
tection from the weather. See the mounting instructions
included with the sensor for detailed mounting instruc-
tions.
4) Remove the existing EZ Zone Master Controller
Board from the EZ Zone enclosure. This will require
the removal of 4 screws securing the board to the en-
closure base.
5) Install the new Zone Manager board onto the exist-
ing enclosure base. The new board installation requires
6 plastic standoffs be inserted between the back of the
new board and the existing standoffs. Secure the board
to 4 of the threaded standoffs (one in each corner of the
board) with the mounting screws provided.
6) Connect the input, output and power wiring per the
Meridian Basic wiring diagram (See Figure 2 on page
17). Connect the keypad display connector of the exist-
ing EZ Zone enclosure cover to the new Meridian Zone
Manager board and secure the existing enclosure cover
to the enclosure base with the existing screws.
7) Remove and replace each EPROM on all the exist-
ing EZ-Zone Zone Controllers. See Figures 16 & 17 on
pages 28 & 29 for detailed EPROM Replacement in-
formation.
To Upgrade To The Meridian Basic System Order the Following:
(1) (2ZZC004708124) EZ Zone to Meridian Basic Upgrade Kit
(Includes: Zone Manager Board w/ Mounting Screws, Plastic Standoff Kit for Zone Manager,
Return Air Sensor, Upgrade Label, Installation Instructions.
(1) (2ZOT004704424) Outside Air Sensor
(X) (2ZZC004708224) EPROM (Replaces EZ Zone, Zone Controller EPROM) (One Required Per
Controller)
Note: When ordering be sure to specify Fahrenheit or Celsius operation for your system
For optional components list and information see pages 14 & 15 of this manual.

EZ Zone/Meridian
Upgrade 9
036-21423-001 Rev. A (0602)
EZ Zone Stand Alone to Meridian Basic
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
To HVAC Unit
Control Panel
Master
Controller Bypass Air
Damper
Static
Pressure
Sensor
#1 #16
FAN
COOL 1
COOL 2
HEAT 1
HEAT 2
BYPASS OPEN
BYPASS CLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C=HVAC UNIT/CLEAR
D = ALARMS
# = STEP/ENTER
*
= DECIMAL
+
++
+
EZ-ZONE COOL MODE
04-08-96 03:48PMFRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
®
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
To HVAC Unit
Control Panel
Zone Manager
Bypass Air
Damper
Static
Pressure
Sensor
#1 #16
FAN
COOL 1
COOL 2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A=ALL ZONES
B=EACH ZONE
C=HVACUNIT/CLEAR
D=ALARMS
#=STEP/ENTER
*
=DECIMAL
+
++
+
EZ-ZONECOOLMODE
04-08-9603:48PMFRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
®
Return
Air Temp
Sensor
Outside
Air Temp
Sensor
8
9
7
4
5
6
3
2
1
#
0
*
Remote Link
(Optional)
CommLink II
Single Loop
(Optional)
WCLI
ATTMASTERONTROS, NC
COMM LINK II
COMM LINK II
LCM
M
OOO
OMD
PP
E
Computer
(Optional - By Others)
Sychronous Data Link
CONTROLS
SIG
DET
RDY
SND
REC
PWR
Telephone Line
(Required For
Remote Link)
Upgraded System
Existing System

EZ Zone/Meridian
10 Upgrade
036-21423-001 Rev. A (0602)
Example #2:
Your project has multiple EZ Zone Master Panels and
their associated Zone Controllers. This upgrade will
convert this to a Meridian Plus System.
To upgrade your existing EZ Zone System to the Me-
ridian Plus System the following procedures will be
required.
Warning:All removal and installation procedures
must be done with the power to the controllers
turned off. Failure to do so can cause severe dam-
age to the controller boards.
1) All power and input/output wiring will need to be
disconnectedfrom the existing Master Controller board.
Disconnect the keypad & display cable from the board
by unplugging its connector from the board and the dis-
play on the existing enclosure cover.
2) The new Return Air Sensor should be installed in
the return air stream in a location upstream of the point
that the bypass duct connects to the return duct.
3) Install the new Outdoor Air Sensor in a location on
the exterior of the building that provides shade and
protection from the weather. Only one OA sensor is
requiredfor the entire system. See the mounting instruc-
tions included with the sensor for detailed mounting
instructions.
4) Connect the CommLink to the network communica-
tions loop and wire in 24VAC power (See Figure 13 on
page 25).
5) Remove the existing EZ Zone Master Controller
Board from the EZ Zone enclosure. This will require
the removal of 4 screws securing the board to the en-
closure base.
6) Install the new Zone Manager board onto the exist-
ing enclosure base. The MiniLink should then be
mounted to the Zone Manager board using the stand-
offs and screws included with the MiniLink. The new
Zone Manager board installation requires 6 plastic
standoffs be inserted between the back of the new board
and the existing standoffs. Secure the board to 4 of the
threaded standoffs (one in each corner of the board)
with the screws that were included with the new Zone
Manager board.
7) Connect the input, output and power wiring per the
Meridian Plus wiring diagram (See Figure 3 on page
18). Connect the new 3 Connector Ribbon Cable key-
pad display connector to the existing EZ Zone enclo-
surecoverand to the new MeridianZoneManager board
(See Figure 18 on page 30). Secure the existing enclo-
sure cover to the enclosure base with the existing
screws.
8) Remove and replace each EPROM on all the exist-
ing EZ-Zone Zone Controllers. See Figures 16 & 17 on
pages 28 & 29 for detailed EPROM Replacement in-
formation.
To Upgrade To The Meridian Plus System Order the Following:
(X) (2ZZC004708324) EZ Zone to Meridian Plus Upgrade Kit (One Required Per Existing Master
Controller) (Includes: Zone Manager Board w/ Mounting Screws, Plastic Standoff Kit for Zone
Manager, MiniLink w/ Mounting Hardware, Return Air Sensor, 3 Way Display/Keypad Connector
cable, Upgrade Label, Installation Instructions).
(1) (2ZCP004703124) CommLink II Kit (Includes: Cables, Power Supply, Installation Instructions)
(1) (2ZOT004704424) Outside Air Sensor (Only One Required For Entire System)
(X) (2ZZC004708224) EPROM (Replaces EZ Zone, Zone Controller EPROM) (One Required Per
Controller)
(1) (2ZSM004702924) System Manager (Not Required if Using Optional Computer)
Note: When ordering be sure to specify Fahrenheit or Celsius operation for your system
For optional components list and information see pages 14 & 15 of this manual.

EZ Zone/Meridian
Upgrade 11
036-21423-001 Rev. A (0602)
EZ Zone Stand Alone to Meridian Plus
Zone Air Dampers
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
Supply
Air Temp
Sensor
To HVAC Unit
Control Panel
To HVAC Unit
Control Panel Master
Controller
Master
Controller
Bypass Air
Damper
Bypass Air
Damper
Static
Pressure
Sensor
Static
Pressure
Sensor
#1
#1
#16
#16
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A=ALLZONES
B=EACHZONE
C=HVACUNIT/CLEAR
D=ALARMS
#=STEP/ENTER
*
=DECIMAL
+
++
+
EZ-ZONE COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YOR K
®
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A=ALLZONES
B=EACHZONE
C=HVACUNIT/CLEAR
D=ALARMS
#=STEP/ENTER
*
=DECIMAL
+
++
+
EZ-ZONE COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YOR K
®
Zone Air Dampers
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
Supply
Air Temp
Sensor
To Other Zone Managers
(Up to 30 Allowed On System)
To HVAC Unit
Control Panel
Network Loop
Network Loop
Local Loop
Zone Manager
Zone Manager
To HVAC Unit
Control Panel
Bypass Air
Damper
Bypass Air
Damper
Static
Pressure
Sensor
Static
Pressure
Sensor
#1
#1
#16
#16
Return
Air Temp
Sensor
Outside
Air Temp
Sensor
Return
Air Temp
Sensor
Only One OA
Sensor Is
Required
For Entire
System
8
9
7
4
5
6
3
2
1
#
0
*
Remote Link
(Optional)
CommLink II
Multiple Loop
WCLI
ATTMASTERONTROS, NC
COMMLINK II
COMMLINK II
LCM
M
OOO
OMD
PP
E
Computer
(Optional - By Others)
SychronousDataLink
CONTROLS
SIG
DET
RDY
SND
REC
PWR
Telephone Line
(Required For Remote Link)
FAN
COOL 1
COOL 2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C=HVACUNIT/CLEAR
D = ALARMS
# = STEP/ENTER
*
= DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
FAN
COOL 1
COOL 2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A = ALL ZONES
B = EACH ZONE
C=HVACUNIT/CLEAR
D= ALARMS
# = STEP/ENTER
*
= DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
System
Manager
(Optional If Computer Front End Used)
Other Controllers
(Optional - Up to 13 On Each Loop))
ClearWindowArea
6
5
4
DEC
7
MINUS
0
CLEAR
9
8
13
2
MENU
Override
Communication
ENTER
ESC
Alarm
SystemManager
-
MeridianPlus
05/17/0003
:38PMW
ED
OCCUPIED
NOALARMS
HeatingandAirConditioning
®
Upgraded System
Existing System

EZ Zone/Meridian
12 Upgrade
036-21423-001 Rev. A (0602)
Example #3:
Your project has a Networked EZ Zone System that you
want to convert to the Meridian Plus system. Please see
the required upgrade components list below for the
necessary parts to be ordered.
To upgrade your existing Networked EZ Zone System
to the Meridian Plus System the following procedures
will be required.
Warning:All removal and installation procedures
must be done with the power to the controllers
turned off. Failure to do so can cause severe dam-
age to the controller boards.
1) All power and input/output wiring will need to be
disconnectedfrom the existing Master Controller board.
Disconnect the keypad & display cable from the board
by unplugging its connector from the board.
2) The new Return Air Sensor should be installed in
the return air stream in a location upstream of the point
that the bypass duct connects to the return duct.
3) Install the new Outdoor Air Sensor in a location on
the exterior of the building that provides shade and
protection from the weather. Only one OA sensor is
requiredfor the entire system. See the mounting instruc-
tions included with the sensor for detailed mounting
instructions.
4) Take the cover off of the Modem Link Central, re-
move the old EPROM and replace with the new
CommLink EPROM. See Figures 14 & 17 on pages 25
& 27 for detailed EPROM installation instructions.
5) Remove the existing EZ Zone Master Controller
Board from the EZ Zone enclosure. This will require
the removal of 4 screws securing the board to the en-
closure base. Remove the existing Master Interface
Board from the old Master Controller board. Remove
the old EPROM from the Master Interface board and
install the new MiniLink upgrade EPROM to the Mas-
ter Interface board. See Figures 15 & 17 on pages 26 &
27 for detailed EPROM installation instructions.
6) Install the upgraded Master Interface board to the
new Zone Manager board using the existing mounting
hardware. Install the new Zone Manager board onto the
existing enclosure base. The new Zone Manager board
installation requires 6 plastic standoffs be inserted be-
tween the back of the new board and the existing stand-
offs. Secure the board to 4 of the threaded standoffs
(one in each corner of the board) with the screws that
were included with the new Zone Manager board.
7) Connect the input, output and power wiring per the
Meridian Plus wiring diagram (See Figure 3 on page
18). Connect the existing 3 Connector Ribbon Cable
keypad display connector to the existing EZ Zone en-
closure cover and to the new Meridian Zone Manager
board (See Figure 18 on page 30). Secure the existing
enclosure cover to the enclosure base with the existing
screws.
8) Remove and replace each EPROM on all the exist-
ing EZ-Zone Zone Controllers. See Figures 16 & 17 on
pages 28 & 29 for detailed EPROM Replacement in-
formation.
To Upgrade To The Meridian Plus System Order the Following:
(X) (2ZZC004708124) EZ Zone to Meridian Basic Upgrade Kit (One Required Per Existing Master
Controller) (Includes: Zone Manager Board w/ Mounting Screws, Plastic Standoff Kit for Zone
Manager, Return Air Sensor, Upgrade Label, Installation Instructions)
(1) (2ZZC004708424) Modem Linc Central to CommLink II Upgrade Kit
(Includes: ComLink EPROM Upgrade Chip, Upgrade Label)
(1) (2ZZC004708524) Master Interface Board to MiniLink Upgrade Kit
(Includes: MiniLink EPROM Upgrade Chip, Upgrade Label)
(1) (2ZOT004704424) Outside Air Sensor (Only One Required Per System)
(X) (2ZZC004708224) EPROM (Replaces EZ Zone, Zone Controller EPROM) (One Required Per
Controller)
(1) (2ZSM004702924) System Manager (Not Required if Using Optional Computer)
Note: When ordering be sure to specify Fahrenheit or Celsius operation for your system
For optional components list and information see pages 14 & 15 of this manual.

EZ Zone/Meridian
Upgrade 13
036-21423-001 Rev. A (0602)
Networked EZ Zone To Meridian Plus
Zone Air Dampers
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
Supply
Air Temp
Sensor
To Other Master Controllers
(Up to 30 Allowed On System)
To HVAC Unit
Control Panel
Network Loop
Network Loop
Local Loop
To HVAC Unit
Control Panel
Bypass Air
Damper
Bypass Air
Damper
Static
Pressure
Sensor
Static
Pressure
Sensor
#1
#1
#16
#16
8
9
7
4
5
6
3
2
1
#
0
*
Modem
(Optional)
Modem Link Central
24VAC
24VAC
WCLI
ATTMASTERONTRO S, NC
COMMLINKII
COMMLINK II
LCM
M
OOO
OMD
PP
E
Computer
(Optional)
Telephone Line
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A= ALL ZONES
B= EACH ZONE
C= HVAC UNIT/CLEAR
D= ALARMS
#= STEP/ENTER
*
=DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A= ALL ZONES
B= EACH ZONE
C=HVAC UNIT/CLEAR
D= ALARMS
#= STEP/ENTER
*
=DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
Master
Controller
Master
Controller
Zone Air Dampers
Zone Air Dampers
Up to 16 Zone Air Dampers Allowed
Up to 16 Zone Air Dampers Allowed
Supply
Air Temp
Sensor
Supply
Air Temp
Sensor
To OtherZone Managers
(Up to 30 Allowed On System)
To HVAC Unit
Control Panel
Network Loop
Network Loop
Local Loop
To HVAC Unit
Control Panel
Bypass Air
Damper
Bypass Air
Damper
Static
Pressure
Sensor
Static
Pressure
Sensor
#1
#1
#16
#16
8
9
7
4
5
6
3
2
1
#
0
*
Modem
(Optional)
Upgraded
Modem Link Central
24VAC
24VAC
WCLI
ATTMASTERONTROS, NC
COMMLINKII
COMMLINK II
LCM
M
OOO
OMD
PP
E
Computer
(Optional)
Telephone Line
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A=ALLZONES
B=EACHZONE
C=HVACUNIT/CLEAR
D=ALARMS
#=STEP/ENTER
*
=DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
FAN
COOL1
COOL2
HEAT1
HEAT2
BYPASSOPEN
BYPASSCLOSE
COMMUNICATION
ALARM
A=ALLZONES
B=EACHZONE
C=HVACUNIT/CLEAR
D=ALARMS
#=STEP/ENTER
*
=DECIMAL
++
++
Meridian COOL MODE
04-08-96 03:48PM FRI
OCCUPIED
NO ALARMS
2
8
5
0
A
C
B
D
1
7
4
*
3
9
6
#
YORK
Zone
Manager
Zone
Manager
Return
Air Temp
Sensor
Outside
Air Temp
Sensor
Return
Air Temp
Sensor
Only One OA
Sensor Is
Required
For Entire
System
System
Manager
(Optional If Computer Front End Used)
Other Controllers
(Optional - Up to 13 On Each Loop))
ClearWindow Area
6
5
4
DEC
7
MINUS
0
CLEAR
9
8
132
MENU
Override
Communication
ENTER
ESC
Alarm
SystemManager
-
MeridianPlus
05/17/0003:38PM WED
OCCUPIED
NOALARMS
HeatingandAir Conditioning
®
Upgraded System
Existing System

EZ Zone/Meridian
14 Upgrade
036-21423-001 Rev. A (0602)
Optional Controllers and Accessories
In addition to the standard Zone Manager and Zone
Controllers, York offers many other controllers and ac-
cessories to enhance your new Meridian System. Op-
tional Controllers that are available for use with the
Meridian Plus system include the CV, CV-C, GPC, Op-
timal Start Scheduler, Lighting Panel Controller and
Wetbulb Module. These controllers are not available
for use with the Meridian Basic System. To utilize any
of the optional controllers you must upgrade your sys-
temto the Meridian Plus configuration. Accessories that
are available for use with either the Meridian Plus or
Basic System include the CommLink II Communica-
tions Interface, Remote Link, Room Sensors, Round
Zone Dampers and Rectangular Zone Dampers. York
also offers Communication Cable that is color coded
and labeled for the network communications loop and
local communications loop.
Following are brief descriptions of the optional con-
trollers and accessories that are available.
CV Controller
The CV Controller provides control of single zone con-
stant volume rooftop or split system HVAC equipment.
CV controllers have four configurable relay outputs for
heating/cooling staging, a 0-10VDC output for econo-
mizer control, on board time clock for scheduling/night
setback functions and built in alarming features.
The CV Controller can be used with the Meridian Plus
System only. The CV can be programmed and moni-
tored from the either the System Manager or from a
personal computer which has the MeridianView Com-
puter front end software installed. Up to 13 CV con-
trollers can be installed on each local communications
loop of your Meridian Plus system.
CV-C Controller
The CV-C Controller is a field configurable constant
volume unit controller that provides additional features
which are not available with the standard CV control-
ler. CV-C controllers can be configured for applications
requiringCO2/IAQeconomizercontrol,modulatingHW
and CW control valves and dehumidification. The CV-
C relay outputs can be expanded via a plug-in expan-
sion board for use in applications requiring additional
heating/cooling staging control.
The CV-C Controller can be used with the Meridian
Plus System only. The System Manager cannot be used
to program or monitor the CV-C controller. CV-C con-
trollers require that a personal computer which has the
MeridianView computer front end software installed
be used for all programming and monitoring. Up to 13
CV-C controllers can be installed on each local com-
munications loop of your Meridian Plus system.
GPC Controller
The GPC (General Purpose Controller) is a very versa-
tile controller that can be used for a variety of control
applications that are outside the function of our stan-
dard HVAC unit controllers. Each GPC controller has
(5) Universal Inputs that can accept contact closures,
thermistor temperature sensors, or 4-20mA/2-10VDC
signals. The controller has (5) digital outputs for on/off
control and (1) 0-10VDC analog output to modulate a
valve or damper. These inputs and outputs can be con-
figured in a variety of ways using And/Or logic func-
tions, time schedules, setpoints, etc. to perform many
different tasks.
The GPC can be used for many applications including,
but not limited to:
• Control of Unit Heaters
• Control of Boilers
• Control of Exhaust Fans
• Monitoring of Temperature
• Monitoring of Humidity
• Monitoring of Status Contacts
The GPC Controller can be used with the Meridian Plus
System only. The System Manager cannot be used to
program or monitor the GPC controller. GPC control-
lers require that a personal computer which has the
MeridianView computer front end software installed
be used for all programming and monitoring.

EZ Zone/Meridian
Upgrade 15
036-21423-001 Rev. A (0602)
Lighting Panel Controller
Adds building lighting control capability to the Merid-
ian System. The Lighting Panel Controller provides up
to (7) Independent time schedules and light levels for
control of up to (7) lighting circuits. The Lighting Panel
Controller relay outputs can be set for on/off relay or
pulsed relay control depending on the lighting system
control contactor requirements. Pushbutton override is
available for each lighting circuit by connecting a mo-
mentary pushbutton to the Lighting Panel Controller
board.
The Lighting Panel Controller can be used with the
Meridian Plus System only. The System Manager can-
not be used to program or monitor the Lighting Panel
Controller. Light Panel Controllers require that a per-
sonal computer which has the MeridianView computer
front end software installed be used for all program-
ming and monitoring.
Optimal Start Scheduler
Providesexpanded scheduling capabilities beyond those
incorporatedwiththe standard Meridian controllers. The
Optimal Start Scheduler provides for optimal
Start/Stop and up to (7) independent schedules with 2
Start/Stop events per day and (14) Start/Stop holiday
events per schedule.
The Optimal Start Scheduler can be used with the Me-
ridian Plus System only. The System Manager cannot
be used to program or monitor the Optimal Start Sched-
uler Controller. This controller requires that a personal
computer which has the MeridianView computer front
end software installed be used for all programming and
monitoring.
Wetbulb Module
Provides wetbulb temperature monitoring for control
of all economizer equipped units on the Meridian
system. The Wetbulb Module includes an Outside Air
Humidity Sensor for measuring outside air relative
humidity and utilizes the installed Outdoor Air Sensor
on the Meridian System to calculate the wetbulb
temperature.Thistemperature is used by the economizer
control portion of the unit controller to provide accurate
economizeroperation. The WetbulbModulecan be used
with the Meridian Basic and Plus Zone Systems. The
Wetbulb Module can be monitored and programmed
from either the System Manager or from a personal
computer which has the MeridianView computer front
end software installed.
Accessories
York offers a complete line of accessories for your
Meridian system. For part ordering information and a
complete list of accessories please see the Meridian
Product List Pricing manual and the Meridian
Replacement Parts List Pricing Catalogs. Following is
a brief list of some of the accessories that are offered
for the Meridian system.
•Remote Link - 14,400 baud modem for
remote access to any Meridian system
•CommLink II - Required to connect the
Auto Zone Basic system to a personal
computer
•Round Air Dampers - Air damper with a
Zone Controller and actuator mounted in a
control enclosure. Available in pressure
dependent and pressure independent models.
Available in round duct sizes of 6”, 8”, 10”,
12”, 14” and 16” diameter.
•Rectangular Air Dampers - Rectangular,
aluminum frame opposed blade dampers.
Available in rectangular duct sizes from 8” x
8” to 24” x 36” in 2” increments of height and
width
•Rectangular Air Damper Kit - Zone
Controller and actuator mounted in a control
enclosure for use with Rectangular Air
Dampers
•MeridianView Computer Software
Free when ordered with an EZ Zone to
Meridian upgrade

EZ Zone/Meridian
16 Upgrade
036-21423-001 Rev. A (0602)
EZ Zone Wiring
The wiring diagram below depicts a typical existing
EZ Zone Master Controller wiring. This diagram is
shown for reference only. It’s intent is to show the dif-
ference between the EZ Zone system wiring and the
Meridiansystem wiring. All wiring should be connected
per the specific Meridian system wiring diagrams on
the following pages.
Static
Pick-up
Static
Pressure
Sensor
Supply Air
Temp Sensor
Splice As
Required
LO HI
HVAC Unit
24VAC Only
R
G
Y1
Y2
W1
W2
Line
Voltage
GND
24VAC
Actuator Wiring
Interface
Feedback (BK)
Close (GR)
Open (YL)
Gnd (WH)
Bypass Air Damper
Actuator
Red
Blk
Grn
RS-485
Communication cable
to Zone Controllers
Master Controller Board
75
90
60
45
Figure 1: Existing EZ Zone Master Controller Wiring

EZ Zone/Meridian
Upgrade 17
036-21423-001 Rev. A (0602)
Meridian Basic Wiring
Figure 2: New Meridian Basic Controller Wiring
Figure2 below depicts the wiring schematic that should
be used for the Meridian Basic System upgrade as de-
scribed in Example 1 on pages 8 and 9 of this manual.
Be sure to pay strict attention to all warnings and cau-
tions listed on the schematic.
Warning:
See Figure 11 in this manual fo
r
important wiring instructions
regarding Honeywell
Economizer Actuators
Zone Manager
Feedback (BK)
Close (GR)
Open (YL)
Gnd (WH)
Notes:
1.)24 VAC Must Be Connected So
That All Ground Wires Remain
Common.
3.)All Communication Wiring To Be 18
Ga. Minimum, 2 Conductor Twisted
Pair With Shield. Belden #82760 Or
Equivalent.
4.)For Individual Component Wiring See
Specific Component Wiring Diagram.
5.)It Is Recommended That All
Controllers Address Switches Are
Set Before Installation.
2.)All Wiring To Be In Accordance With
Local And National Electrical Codes
and Specifications.
RS-485
Communications To Zone
Controllers
Return Air Temp.
Sensor
Supply Air Temp.
Sensor
Line
Voltage
HVAC Unit
24VAC Only
Red
Blk
To Relief / Exhaust Fans
Grn
Static
Pick-up
Static
Pressure
Sensor
Splice As
Required
LO HI
GND
24VAC
Belimo Actuator Wiring Shown.
Consult Factory For Other
Models Of Economizer Actuators.
Some Actuators Require Isolation
Transformers In Order To Prevent
Damage To The Controller Board.
WARNING!
Use Extreme Care When Wiring
Economizer Actuators
Never Connect Or Disconnect
Wiring With Power Applied!
Never Apply Power If The
Gnd ( 1 Com ) Terminal On The
Actuator Is Not Connected.
See Note 1 &2
Outdoor Air Temp.
Sensor
Aux3
Forced
Occupied
Mode
Aux1
Economizer
Disable
Aux2
Filter
Alarm
Auxiliary Inputs
( Dry Contacts )
R
G
Y1
Y2
W1
W2
Economizer Actuator
133 IN-LB
AF24-SR
1 COM
2+
3Y1
4Y2
5U BELIMO
Actuator Wiring
Interface
Bypass Air Damper
Actuator
C987
CABLE
R6
R5
HEAT 2
SW1
W2
W1
Y2
HEAT2
HEAT1
COOL2
COOL1
FAN
HEAT 1
COOL 2
COOL 1
C 1992
1
16
32
B
NET
2
4
8
ADD
COMM DRIVER
RS-485
75176
MADE IN U.S.A.
D17
D18
D19
D20
D21
D22
D23
D24
0*#D
R
SH
T
COMM
C1
C2
+
P1
RIBBON
GND
06/11/95 03:48PM FRI
Auto-Zone COOL MODE
G
Y1
V6
V5
CLOSE
V4
V3
OPEN
GND
FDBK
FAN
CLOSE
OPEN
+
REC
+
GND
NE5090
4 5 6
KEYPAD
1 2 3
B
A
NO ALARM(S)
OCCUPIED
LCD DISPLAY
&
+
+
24VAC
TB2
POWER
+
+
+
ADJUST
5.11V
PJ1
+
+
PRESSURE
SENSOR JACK
+5V
SIG
BUSS
EXP
TB2
A2
G
OUTPUTS
ANALOG
A1
N.O.
CONTACTS
EXHAUST
AUX3
GND
GND
AUX2
AUX1
ANALOG
SAT
OAT
RAT
INPUTS
+12V
TB12
BYPASS
BYPASS
Local Loop
Address Switch Must Always Be Set
To Address 0 on Zone Manager Board
As Shown
Zone Manager
Address Switch
These Switches Must Be
In The OFF Position
As Shown
ADD
1
2
4
8
16
32
B
NET
ADD
32
B
NET
16
8
4
1
2
OFF >
OFF >
Rocker Down
Rocker Down
75
90
60
45

EZ Zone/Meridian
18 Upgrade
036-21423-001 Rev. A (0602)
Zone Manager
Notes:
1.)24 VAC Must Be Connected So
That All Ground Wires Remain
Common.
3.)All Communication Wiring To Be 18
Ga. Minimum, 2 Conductor Twisted
Pair With Shield. Belden #82760 Or
Equivalent.
5.)For Individual Component Wiring See
Specific Component Wiring Diagram.
2.)All Wiring To Be In Accordance With
Local And National Electrical Codes
and Specifications.
RS-485
Communications To Zone
Controllers, CV Controllers
And/Or System Manager
Return Air Temp.
Sensor
Supply Air Temp.
Sensor
Line
Voltage
HVAC Unit
24VAC Only
Red
Blk
To Relief / Exhaust Fans
Grn
Static
Pick-up
Static
Pressure
Sensor
Splice As
Required
LO HI
GND
24VAC
Belimo Actuator Wiring Shown
Consult Factory For Other
Models Of Economizer Actuators
Some Actuators Require Isolation
Transformers In Order To Prevent
Damage To The Controller Board.
WARNING!
Use Extreme Care When Wiring
Economizer Actuators
Never Connect Or Disconnect
Wiring With Power Applied!
Never Apply Power If The
Gnd ( 1 Com ) Terminal On The
Actuator Is Not Connected.
See Note 1 &2
+
+
+
+
+
+
+
+
+
HEAT2
HEAT1
COOL2
COOL1
FAN
R
2
8
C
SW1
16
A
B
2
4
ADD
LOCAL
LOOP
Local Loop
T
SH
R
TB3
COMM
T
SH
R
32
16
8
4
1
2
MINILINK
R9
R10
R8
IC
EXP
PORT
PWR
V4
V3
CLOSE
OPEN
FDBK
REC
GND
GND
24VAC
AUX1
OPEN
K1
NETWORK
LOOP
Network Loop RS-485
19200 Baud
To Other Zone
Managers and/or
CommLink on
System
SH
R
T
CLOSE
K2
NE5090
ANALOG
OUTPUTS
A2
G
TB2
A1
N.O.
EXHAUST
CONTACTS
GND
GND
AUX3
AUX2
7824
D25
U14
VR3
R40
ADJUST
5.11V
C27
7812
C26
VR2
D1
D3
D4
D2
PJ1
PRESSURE
SENSOR JACK
+5V
R7
OAT
RAT
+12V
SAT
ANALOG
INPUTS
GND
SIG
T
R
SHIELD
T
R
SHIELD
Outdoor Air Temp.
Sensor
(See Note 4)
Aux3
Forced
Occupied
Mode
Aux1
Economizer
Disable
Aux2
Filter
Alarm
Auxiliary Inputs
( Dry Contacts )
R
G
Y1
Y2
W1
W2
Economizer Actuator
133 IN-LB
AF24-SR
1 COM
2+
3Y1
4Y2
5U
BELIMO
Actuator Wiring
Interface
Bypass Air Damper
Actuator
4.)Only One Outside Air Sensor Is
Required Per System. It May Be
Connected To Any CV Controller Or
Zone Manager On The System. If A
Wetbulb Module Controller Is Used The
OA Sensor Must Be Connected To The
Wetbulb Module.
75
90
60
45
Meridian Plus Wiring
Figure 3: New Meridian Plus Controller Wiring
Figure3 below depicts the wiring schematic that should
be used for the Meridian Plus System upgrade as de-
scribed in Example 2 on pages 10 and 11 of this manual.
This schematic is also used for wiring of Example 3 on
pages 12 & 13 of this manual. Be sure to pay strict at-
tention to all warnings and cautions listed on the sche-
matic.
Warning:
See Figure 11 in this manual for
important wiring instructions
regarding Honeywell economizer
actuators

EZ Zone/Meridian
Upgrade 19
036-21423-001 Rev. A (0602)
16
32
8
4
2
1
Caution!
The MiniLinks Must Have Address Switches Set Between 1
And 30 (Up To 30 MiniLinks (Mounted on Zone Managers)
Are Allowed Per Auto-Zone Plus System). The MiniLinks
Should Be Addressed In Consecutive Order Starting With
Address #1. Address #1 Must Be Present On The Loop For
The System To Function.
Address Switch Shown Is
Set For Address 1
Address Switch Must Always Be Set
To Address 17 on Zone Manager Board
As Shown
Address Switch Shown Is
Set For Address 4
Zone Manager
Address Switch
MiniLink
Address Switch
These Switches Must Be
In The OFF Position
As Shown
These Switches Must Be
In The OFF Position
As Shown
Caution:
The Power To The Zone Manager Must Be
Removed And Reconnected After Changing The
MiniLink Or Zone Manager Address Switch Settings
In Order For Any Changes To Take Effect.
Caution:
Disconnect All Communication Loop Wiring From
The Zone Manger Before Removing Power.
Reconnect Power And Then Reconnect
Communication Loop Wiring To Zone Manager.
ADD
ADD
ADD
1
2
4
8
16
32
B
NET
ADD
All Zone Managers On System Must Be
Addressed As 17
Network Switch As ShownMust Be ON
The Address For Each MiniLink
Must Be Unique To The Other MiniLinks
On The Network Loop. Loop #1 MiniLink
Should Be Addressed As #1
Loop #2 MiniLink Should Be Addressed
As #2 Etc..
ADD
ADD
ADD
32
32
32
B
B
NET
NET
16
16
16
8
8
8
4
4
4
1
1
1
2
2
2
OFF >
OFF >
OFF >
Rocker Down
Rocker Down
Rocker Down
HEAT2
HEAT1
COOL2
COOL1
FAN
R
LOCAL
LOOP
T
SH
R
TB3
COMM
T
SH
R
MINILINK
V4
V3
CLOSE
OPEN
FDBK
GND
OPEN
K1
NETWORK
LOOP
SH
R
T
CLOSE
K2
ANALOG
OUTPUTS
A2
G
TB2
A1
Zone Manager Board
(Under MiniLink Board)
MiniLink Address Switch Setting
Zone Manager Address Switch Setting
MiniLink Board
(Mounted On Top Of Zone Manager Board)
Meridian Plus Address Switches
Figure 4: New Meridian Plus Address Switch Setting
The Meridian Plus Zone Manager has two different
address switches. One is located on the main Zone
Managerboardand one is located on the MiniLinkboard
that is located on the top of the Zone Manager board.
The Zone Manager board address should always be set
to address 17 on the Meridian Plus system. The
MiniLinkboardshould be addressed with aunique num-
ber for each Zone Manager on the system. It is recom-
mended that you start with address 1 and address each
Zone Manager consecutively. See Figure 4 below for
detailed information.

EZ Zone/Meridian
20 Upgrade
036-21423-001 Rev. A (0602)
HVAC Staging Connections
Figure 6: New Meridian HVAC Wiring
Figure5 below shows the EZ Zone Master Controller
wiring. Figure 6 below depicts the wiring schematic
that should be used for wiring of all Meridian Zone
Managers boards. As can be seen below, the Meridian
OUT1
OUT2
OUT3
OUT4
OUT5
FAN
COOL1
COOL2
HEAT1
HEAT2
24VAC-R
Fan-G
Cool - Y1
Cool - Y2
Heat - W1
Heat - W2
HEAT2
HEAT1
COOL2
COOL1
FAN
R
Fan-G
Cool - Y1
Cool - Y2
Heat - W1
Heat - W2
24 VAC -R
Figure 5: Existing EZ Zone HVAC Wiring
The EZ Zone Master Con-
troller relay outputs consist
ofa series of five double pole
terminal blocks. Wire jump-
ers between terminal blocks
are required to the common
of each relay.
The Meridian Zone Manager
wiring has been simplified.
There is only one terminal
block with connections
clearlymarked for ease of in-
stallation. Jumpers are no
longer required since the
commons are tied together
within the circuit board.
ZoneManager wiring is much simpler than the EZ Zone
Master Controller wiring. Be sure to pay strict atten-
tion to all warnings and cautions listed on the sche-
matic.
This manual suits for next models
1
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