Pressure Independent VAV Applications with CEP/CSP-4000 Series
51
CTE-5202 Applications Guide, AN0912A Rev. D
Damper Tracking (Master/Slave)
The configuration is used for special applications
where a differential pressure is needed (either posi-
tive or negative). The thermostat controls the “mas-
ter” CEP-4xxx controller-actuator and an REE-1013
relay controls the “slave.” The relay takes the voltage
reading from the master CEP-4xxx and repeats it to
the slave CEP-4xxx plus or minus a given offset.
As an example, the master CEP-4xxx is supplying
a velocity of 450 fpm (4.0 VDC on terminal 6), and
the relay commands the slave controller to exhaust
550 fpm (4.1 VDC). The amount of voltage “offset”
would be 0.10 VDC to set-up the REE-1013. See the
Voltage/Velocity Correlation section in the
. With the REE-1013, the
maximum offset is ±2 VDC as measured by a voltme-
ter between the + and – terminals.)
~
T
T
AI1
AO
1
AO
2
CTE-5202
Thermostat
24 VAC @ 20 VA
~
–
(Phase)
(Neutral)
1
2
3
7
6
5
4
3
2
1
8
9
10
11
12
13
14
CEP-4xxx
Controller-Actuator
SSE-1001/1002
Flow Sensor
1
2
3
7
6
5
4
3
2
1
8
9
10
11
12
13
14
4
5
6
Slave
4
2
–
Increase
+
Offset
Master
Meter
Reading
for Offset
Adjustment
REE-1013
Offset Relay
Select Sequence 1
Select Sequence
1
(from the
CTE-5202
SYSTEM
menu).
See
. (This replaces a
CTE-1101 with Direct Acting
reset.)
NOTE: Manufacturing of
the REE-1013 was
discontinued in
October 2013.