Application Guide

Pressure Independent VAV Applications with CSP-5001/5002 41 CTE-5202 Applications Guide, AN0912A Rev. H
Fan Induction with 2-Stage Electric Heat
In this fan induction application, the CTE-5202
thermostat is used with a REE-5002 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 rst stage of reheat begins, and the second stage
of reheat follows if the thermostat is still not satis-
ed. The process reverses as the room temperature
begins to rise.
Sequence 1 should be selected from the CTE-5202
SYSTEM menu. See Change Conguration on page 6.
~
T T
AI1
AO1 AO2
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 VAC
Fan 1 2
Stages
X
T
Load
Heat Stage 2
(See also the Fan Induction with 2-Stage Electric
Heat section with a CTE-5101 in the CSP-5001/5002
Applications Guide.)
NOTE: The REE-5002 provides the fan an
adjustable start point between 3 and 8
VDC, with a 1 VDC switching dierential.
The “X” Terminal is used for measuring fan
trip voltage. See the REE-5002 Installation
Guide 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