Meridian Plus Wiring; Figure 3: Existing Meridian Plus Controller Wiring - York EZ Zone Upgrade Manual

EZ Zone/Meridian

Meridian Plus Wiring

Figure 3 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
Bypass Air Damper
Actuator
90
75
60
45
Actuator Wiring
Interface
Network Loop RS-485
19200 Baud
To Other Zone
Managers and/or
CommLink on
System
R
G
Y1
Y2
W1
W2
24VAC Only
Line
Voltage
24VAC
GND
See Note 1 &2
Notes:
1.)24 VAC Must Be Connected So
That All Ground Wires Remain
Common.
2.)All Wiring To Be In Accordance With
Local And National Electrical Codes
and Specifications.
3.)All Communication Wiring To Be 18
Ga. Minimum, 2 Conductor Twisted
Pair With Shield. Belden #82760 Or
Equivalent.
Figure 3: New Meridian Plus Controller Wiring
18
Splice As
Required
Zone Manager
7824 7812
24VAC
PWR
GND
I C 2
EXP
PORT
+
+
NE5090
REC
OPEN
FDBK
GND
CLOSE
OPEN
CLOSE
V3
V4
1
2
T T
4
8
SHIELD SH
16
32
R
R
NETWORK
R
LOOP
FAN
COOL1
COOL2
HEAT1
HEAT2
LOCAL
T LOOP
T
SHIELD
SH
R R
Local Loop
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.
5.)For Individual Component Wiring See
Specific Component Wiring Diagram.
pages 12 & 13 of this manual. Be sure to pay strict at-
tention to all warnings and cautions listed on the sche-
matic.
Static
Pressure
Sensor
LO HI
Static
Pick-up
ANALOG
PJ1
R7 INPUTS
D1
R8
D2
+12V
5.11V
SAT
ADJUST
D3 R9
RAT
D4 R10
OAT
AUX1
AUX2
AUX3
GND
GND
EXHAUST
CONTACTS
N.O.
ANALOG
OUTPUTS
A1
A2
G
TB2
COMM
T
SH
R
TB3
RS-485
Communications To Zone
Controllers, CV Controllers
And/Or System Manager
036-21423-001 Rev. A (0602)
Supply Air Temp.
Sensor
Return Air Temp.
Sensor
Outdoor Air Temp.
Sensor
(See Note 4)
Auxiliary Inputs
Aux1
( Dry Contacts )
Economizer
Disable
Aux2
Filter
Alarm
Aux3
Forced
Occupied
Mode
To Relief / Exhaust Fans
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.
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.
Economizer Actuator
5 U
BELIMO
4 Y2
AF24-SR
3 Y1
133 IN-LB
2 +
1 COM
Warning:
See Figure 11 in this manual for
important wiring instructions
regarding Honeywell economizer
actuators
Upgrade