Application Guide

Pressure Independent VAV Applications with CSP-4702 30 CTE-5202 Applications Guide, AN0912A Rev. H
~
T T
AI1
AO1 AO2
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 VAC
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-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.
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