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Pressure Independent VAV Applications with CSP-4702
21
CTE-5202 Applications Guide, AN0912A Rev. D
Replacing a CEP-4xxx or CSP-40xx/42xx/44xx/46xx
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
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 different from the
old CSP-40xx/42xx/44xx/46xx models.
There are
some differences 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:
that operates
from the 16 VDC supplied by the CSP-4702.
•
Or powered by an
power supply
(connected to the transformer) to deliver 9.1
VDC to the existing thermostat.
•
If replacing a C
E
P-4xxx, an attached SS
E
-xxxx
sensor must be replaced with an SS
S
-
1xxx sensor. 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-1xxx air flow 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 different
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 flow sensor, no
longer used (but SSE-2xxx sensors can still be
used for duct temperature sensing)
~
T
T
AI1
AO
1
AO
2
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
. See also