Fan Induction With 2-Stage Electric Heat - KMC Controls CTE-5202 Application Manual

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 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.
CSP-4702
Controller-Actuator
24 VAC @ 35 VA
~
(Phase)
(Neutral) –
24 VAC Contactors
Heat Stage 2
Heat Stage 1
Fan
(10 VA Max. per Stage)
Pressure Independent VAV Applications with CSP-4702
(To Flow Sensor)
REE-5002 Relay Module
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
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).
12 V
8 V
6 V
Fan
3V
1 V
(Colder
CTE-5202
Thermostat
30
REE-5002 Installation
AO2 Signal
AO1 Signal
Cooling
Cooling Min.
#2 #1 Setpoint
Room Temperature Warmer)
Select Sequence 1
CTE-5202 Applications Guide, AN0912A Rev. D
Max.