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Pressure Independent VAV Applications with CSP-4702
22
CTE-5202 Applications Guide, AN0912A Rev. D
~
T
T
AI1
AO
1
AO
2
CTE-5202
Thermostat
~
–
(Phase)
(Neutral)
(To Flow Sensor)
(5K–10K
Ohm Resistor
between AI1
and Common
for Heating
Mode Only)
CSP-4702
Controller-Actuator
24 VAC @ 5 VA
Cooling or Heating
CTE-5202 thermostats can use CSP-4702 electronic
VAV controllers to operate damper boxes in the
pressure-independent VAV system. As shown in
the diagram, a “requested flow” voltage signal
(AO1) is connected to the CSP-4702 to adjust airflow
from minimum to maximum flow according to
space demand. Minimum and maximum flow limit
adjustments can be made at the thermostat or at the
controller.
For
cooling
, select Sequence
1
(from the CTE-5202
SYSTEM
menu). See
.
Heating Air
Heating Max.
Heating Min.
Setpoint
(
Colder
Room Temperature
Warmer
)
Cooling Max.
Cooling Min.
Air
Flow
Air
Flow
Setpoint
(
Colder
Room Temperature
Warmer
)
AO1
Signal
Cooling Air
AO1
Signal
Select Sequence 1
Select Sequence 1
AND Set Changeover to 55° F
For
heating
, connect a 5K to 10K ohm resistor
between Common and AI1. Select Sequence
1
and
lower the Changeover to the lowest setting (55° F).
See
Change Configuration on page 6
. The resistor
simulates a changeover sensor and puts the thermo
-
stat in Reverse Acting mode.
NOTE: If the resistor value is too high, the
thermostat will not go into RA mode. If
the resistor value is too low, the thermostat
may go into setback mode.
Select
Sequence 1