Dual Duct Heat/Cool Constant Volume With Hot Deck Make-Up - KMC Controls CTE-5202 Application Manual

Dual Duct Heat/Cool Constant Volume with Hot Deck Make-Up

This application is designed for dual-duct
installations requiring constant air volume (CAV).
In this application, a single-duct cooling controller
is mounted on the cold air duct, and its minimum
and maximum flow is reset by the room thermostat.
A second "slave" controller is mounted on the hot
air duct as a constant volume unit, with the flow
sensor measuring downstream "total flow" into the
space. (The "slave" controller has no reset from the
thermostat.)
As the cold deck resets from maximum to minimum
flow, the hot deck controller senses a decrease in
"total flow" to the space, opens the hot air duct
to compensate, and thus maintains a constant
combined airflow into the room.
NOTE: Minimum and
maximum to be set
on the cooling side
(AO1) in the CTE-
5202 LIMITS menu.
(Heating side makes up
the remainder for the
constant volume.)
Constant volume setting
must be equal to or
greater than cooling
maximum.
Set constant volume
on the heating side by
adjusting maximum
for AO2 to 10 VDC
and adjusting AO2
minimum (volts) for
the desired constant
volume. (See the
Voltage/Velocity
Correlation chart in
the CEP-4000 Series
Applications
3300
fpm
Constant Volume
Max.–3000 fpm
Air
Flow
Cooling Min.
0–3000 fpm
0 fpm
Cooling
Setpoint
(Colder Room Temperature
Pressure Independent VAV Applications with CEP/CSP-4000 Series
24 VAC @ 20 VA
–
(Neutral)
(Phase) ~
Guide.)
Cooling Max.
Min.–3000 fpm
Warmer)
Sequence 3 should be selected from the CTE-5202
SYSTEM menu. See
(See also the Dual Heating/Cooling Constant Volume
w/ Hot Deck Make-Up section with a CTE-1103 in
the CEP-4000 Series Applications
Select Sequence 3
CEP-4xxx
Controller-Actuator
8
9
10
11
12
13
14
(Hot Deck) SSE-1001/1002
Flow Sensor (Located
in Common Discharge)
CEP-4xxx
Controller-Actuator
8
9
10
11
12
13
14
(Cold Deck) SSE-1001/1002
Flow Sensor (Located
in Cold Air Inlet)
53
Change Configuration on page
Guide.)
7
6
5
4
3
2
1
1
2
3
7
6
5
4
3
2
1
1
2
3
CTE-5202 Applications Guide, AN0912A Rev. D
6.
CTE-5202
Thermostat