Application Guide

Pressure Independent VAV Applications with CSP-4702 21 CTE-5202 Applications Guide, AN0912A Rev. H
Replacing a CEP-4xxx or CSP-40xx/42xx/44xx/46xx or CSE-484x
With changes to the sensors, the CSP-4702 can
generally be used in any of the older CEP-4xxx and
CSP-40xx/42xx/44xx/46xx applications shown in the
section Pressure Independent VAV and CAV Applica-
tions with CEP/CSP-4000 Series on page 43.
Although it may sound as if it belongs in the same
series, the new CSP-4702 is quite dierent from the
discontinued CSP-40xx/42xx/44xx/46xx models.
There are some dierences among the models of
which the installer must be aware:
• CEP-4xxx and CSP-40xx/42xx/44xx/46xx control-
lers supply 9.1 VDC for connected thermostats.
The CSP-4702 (like the CSP-500x controllers)
outputs 16 VDC. When replacing an older
controller, any connected thermostat that oper-
ates from 9.1 VDC power must also be:
• Replaced with the CTE-5202 that operates
from the 16 VDC supplied by the CSP-4702.
• Or powered by an XEE-4002 power supply
(connected to the transformer) to deliver 9.1
VDC to the existing thermostat.
• If replacing a CEP-4xxx, an aached SSE-xxxx
sensor must be replaced with an SSS-
100x sensor. (See the SSS-1000 Series
Installation Guide.) For an existing
SSE-200x used for duct temperature
sensing, terminals X and Y can continue
to be used for duct temperature sensing,
and an SSS-100x air ow sensor can be
installed separately.
• If a CSP-4702 is used to replace an
existing CxP-4xxx and limits were set in
the CxP-4xxx, the limits will need to be
set (in either the CSP-4702 or the thermo-
stat). If a CSP-4702 is used to replace an
existing CxP-4xxx and limits were set in
the thermostat, the limits in the thermo-
stat should be checked and adjusted to
ensure accuracy.
• The terminals on a CxP-4xxx are very dierent
than on a CSP-4702:
• 10 = 24 VAC phase
• 9 = 24 VAC neutral/common
• 6 = Input from thermostat
• 5 = Power (VDC) to thermostat
• 4 = Common
• 3, 2, and 1 = to SSE-1xxx ow sensor, no
longer used (but SSE-2xxx sensors can still be
used for duct temperature sensing)
~
T T
AI1
AO1 AO2
CTE-5202
Thermostat
~
–
(Phase)
(Neutral)
(To Flow Sensor)
SSE-2001/2002
1
2
3
Y
X
(Flow Sensor
Disconnected)
Temperature Sensor
CSP-4702
Controller-Actuator
24 VAC @ 5 VA
NOTE: Compare the wiring of the CSP-4702
version of cooling with heating changeover
below to the CEP-4xxx version in Cooling
with Heating Changeover on page 48.
See also Cooling with Heating Changeover
on page 26.
NOTE: The discontinued CSE-484x is similar to a
CSP-4xxx, but it does not have a built-in
actuator. A CSP-4702 can replace a CSE-
484x together with its external actuator.