Meridian Basic Wiring; Figure 2: New Meridian Basic Controller Wiring - York EZ Zone Upgrade Manual

036-21423-001 Rev. A (0602)

Meridian Basic Wiring

Figure 2 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.
Bypass Air Damper
Actuator
90
75
60
45
24VAC
POWER
GND
Actuator Wiring
Interface
Feedback (BK)
Gnd (WH)
+
Open (YL)
Close (GR)
FDBK
GND
OPEN
CLOSE
R
G
Y1
COOL1
Y2 COOL2
W1
HEAT1
W2
HEAT2
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.

Figure 2: New Meridian Basic Controller Wiring

Upgrade
Splice As
Required
LO
Zone Manager
5.11V
ADJUST
TB2
Auto-Zone COOL MODE
06/11/95 03:48PM FRI
OCCUPIED
NO ALARM(S)
+
NE5090
REC
LCD DISPLAY
BYPASS
&
KEYPAD
OPEN
BYPASS
1 2 3
CLOSE
G
V3
4 5 6
V4
FAN
V5
V6
Y1
7 8 9
COOL 1
* 0 #
Y2
FAN
COOL 2
W1
HEAT 1
W2
MADE IN U.S.A.
C 1992
HEAT 2
RS-485
Communications To Zone
Controllers
These Switches Must Be
In The OFF Position
As Shown
Address Switch Must Always Be Set
To Address 0 on Zone Manager Board
As Shown
3.)All Communication Wiring To Be 18
Ga. Minimum, 2 Conductor Twisted
Pair With Shield. Belden #82760 Or
Equivalent.
Be sure to pay strict attention to all warnings and cau-
tions listed on the schematic.
Static
Pressure
Sensor
HI
Static
Pick-up
PJ1 ANALOG
INPUTS
+12V
SAT
RAT
OAT
AUX1
AUX2
AUX3
GND
GND
EXHAUST
CONTACTS
N.O.
ANALOG
To Relief / Exhaust Fans
OUTPUTS
A1
A2
A
G
TB2
EXP
B
BUSS
C
RIBBON
CABLE
D
R5
R6
COMM
T
SH
75176
R
RS-485
COMM DRIVER
Local Loop
Zone Manager
Address Switch
4.)For Individual Component Wiring See
Specific Component Wiring Diagram.
5.)It Is Recommended That All
Controllers Address Switches Are
Set Before Installation.
EZ Zone/Meridian
Supply Air Temp.
Sensor
Return Air Temp.
Sensor
Outdoor Air Temp.
Sensor
Auxiliary Inputs
( Dry Contacts )
Aux1
Economizer
Disable
Aux3 Aux2
Forced Filter
Occupied
Alarm
Mode
Warning:
See Figure 11 in this manual for
important wiring instructions
regarding Honeywell
Economizer Actuators
Economizer Actuator
5 U
BELIMO
4 Y2
AF24-SR
3 Y1
133 IN-LB
2 +
1 COM
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.
17