EngA C-TRAC2 - Option 2 - Remote Discharge Set-Point with Separate Discharge Sensor

A C-TRAC2.1 MANUAL
IOM-12 Page 7 March 1999 R1
BMS Minimum Position Reset
Some applications require that BMS systems take control of the minimum OA position for smoke control or to
maintain building static by supplying a 0 – 10 VDC signal to the C-TRAC 2.1. This method would require a
diode to be placed on ‘ED’ terminal and another diode on remote signal wire to eliminate feedback problem.
(See drawings).
NOTE:Fieldanalogcontrolinputsrequiresignalisolationtopreventground
loopsignalcorruptionand/ordamagetothecontroller(s).
SAMPLE WIRING FOR 0 – 10 VDC MOTORS
1

E
R
W
B
ED
R W
HIGH AMBIENT SET BACK AT
75° (23°C) R-w CLOSES ON
RISE
ENG A C-TRAC
CONTROL


2
1
3
2
1
3
0 – 10 VDC
DAMPER
OPERATOR
24V UNGROUND XFMR
MAY HAVE
MULTIPLE
OPERATORS
0 – 10V DC ECOMOMIZER OPERATORS
-
+
24V UNGROUND XFMR
R W
0 – 10V DC ECONOMIZER OPERATION
WITH EXTERNAL 0 – 10VDC SIGNAL OVERRIDE
NOTE: UNGROUNDED TRANFORMER IS REQUIRED FOR C-TRAC CONTROLLER WHEN 0 – 10 VDC DAMPER OVERRIDE SIGNAL
BY OTHERS IS USED.
2


H
N
E
K R
W





A
C

B
ED
1
2
C1
C1


2
1
3
2
1
3
0 – 10 VDC
DAMPER
OPERATOR
MAY HAVE
MULTIPLE
OPERATORS
120/24V/20VA
Unground XFMR
NIGHT
CONTACT
High Ambient
Setback at 75F
(23C R-W Closes
on Rise
Low Ambient
Control at 50F
(10C) R-W Closes
on Rise
24V or 120V Power
Supply from Main
Transformer
EngA C-
TRAC
CONTROL
1LPC
1HPC
2LPC
2HPC
0 – 10 VDC
Damper Override
Signal by Others
DIODE
DIODE
H
N

R W
HIGH AMBIENT
SET BACK AT 75°
(23°C) R-w
CLOSES ON RISE
DAMPER
ON/OFF
CONTACT
=


E
R
W
B
ED
ENG A C-TRAC
CONTROL USING
A
REMOTE MIN. POS.
POTENTIOMETER
2
1
3
2
1
3
0 – 10 VDC
DAMPER
OPERATION
24V UNGROUND XFMR
MAY HAVE
MULTIPLE
OPERATORS
2
3
4
1
=
REMOTE
SGA24
MINIMUM
OUTSIDE
POSITIONER
3
FOR CONTINUOUS ECONOMIZER
OPERATION SWITCHES 6 AND 7 TO
BE ‘OFF’.
R B
REMOTE MINIMUM OUTSIDE AIR POSITIONER
C/W 0 – 10 V DC ECONOMIZER OPERATORS
E
R
W
B
ED
ENG A C-TRAC CONTROL
DOES NOT USE INTERNAL
MINIMUM POSITION
POTENTIOMETER


2
1
3
0 – 10 VDC
DAMPER
OPERATION
24V UNGROUND XFMR
2
1
3
MAY HAVE
MULTIPLE
OPERATORS
4
Z
V
VVVVVVVVVV

R B
-
+
=
DAMPER
ON/OFF
CONTACT
10K MIN.
POS. POT.
MOUNTED
IN
CONTROL
CABINET
FOR CONTINUOUS ECONOMIZER OPERATION SWITCHES 6 AND 7 TO BE OFF
CONTINUOUS 0 – 10 V DC ECONOMIZER OPERATOR c/w OUTSIDE
AIR MINIMUM POSITION POTENTION MOUNTED IN CONTROL
C
ABINET
HIGH AMBIENT
SET BACK AT
75° (23°C) R-
w
CLOSES ON
RISE