Pressure Independent VAV Applications with CEP/CSP-4000 Series
50
CTE-5202 Applications Guide, AN0912A Rev. D
~
T
T
AI1
AO
1
AO
2
CTE-5202
Thermostat
24 VAC @ 40 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
REE-4002/5002 Relay Module
24 VAC Contactors
(10 VA Max. per Stage)
Heat Stage 1
Fan
~
–
24
V
A
C
Fan
1
2
Stages
X
T
Load
Heat Stage 2
Fan Induction with 2-Stage Electric Heat
In this fan induction application, the CTE-5202
thermostat is used with a REE-4002/5002 relay
module, a fan, and two coils (for two stages of heat).
The REE-4002/5002 was designed primarily for use
with VAV fan-powered induction boxes.
If the temperature drops below setpoint, the REE-
4002/5002 senses the decrease in voltage on AO2 and
starts the fan. As the temperature continues to drop,
the first stage of reheat begins, and the second stage
of reheat follows if the thermostat is still not satis
-
fied. The process reverses as the room temperature
begins to rise.
Sequence
1
should be selected from the CTE-5202
SYSTEM
menu. See
Change Configuration on page 6
.
(See also the Fan Box with Reheat section with a
NOTE: The REE-4002/5002 provides the fan an
adjustable start point. The “X” Terminal is
used for measuring fan trip voltage. See the
NOTE: Triac outputs on the REE-4002/5002 are for
24 VAC loads only. The phase side of the
transformer connects to the “common” side
of the load (contactors).
Select Sequence 1
Fan
(
Colder
Room Temperature
Warmer
)
AO2 Signal
Cooling
Max.
Cooling Min.
AO1 Signal
Setpoint
6 V
1 V
3V
#2 #1
12 V
8 V