Pressure Independent VAV Applications with CSP-5001/5002
41
CTE-5202 Applications Guide, AN0912A Rev. D
Fan Induction with 2-Stage Electric Heat
In this fan induction application, the CTE-5202
thermostat is used 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
menu. See
Change Configuration on page 6
.
~
T
T
AI1
AO
1
AO
2
CTE-5202
Thermostat
CSP-5001
Controller-Actuator
H
~
16
V
DC
I
N
O
U
T
–
–
L
24 VAC
REE-5002 Relay Module
(To Flow Sensor)
24 VAC @ 34 VA
~
–
24 VAC Contactors
(10 VA Max. per Stage)
Heat Stage 1
Fan
(Phase)
(Neutral)
~
–
24
V
A
C
Fan
1
2
Stages
X
T
Load
Heat Stage 2
(See also the Fan Induction with 2-Stage Electric
Heat section with a
.)
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
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