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Pressure Independent VAV Applications with CSP-4702
30
CTE-5202 Applications Guide, AN0912A Rev. D
~
T
T
AI1
AO
1
AO
2
CTE-5202
Thermostat
~
–
(Phase)
(Neutral)
(To Flow Sensor)
REE-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
CSP-4702
Controller-Actuator
24 VAC @ 35 VA
Fan Induction with 2-Stage Electric Heat
This fan induction application uses the thermostat
with a REE-500
2
relay module, a fan, and two
coils (for two stages of reheat). The REE-5002 was
designed primarily for use with VAV fan-powered
induction boxes.
If the temperature drops below setpoint, the REE-
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
.
NOTE: The REE-5002 provides the fan an
adjustable start point between 3 and 8
VDC, with a 1 VDC switching differential.
The “X” Terminal is used for measuring fan
trip voltage. See the
for details.
NOTE: Triac outputs on the REE-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