11
ANALOG CONTROLS
Balancing Procedures (Control Sequences
2100-2105) —
The analog electronic control system is a
pressure independent volume reset control that uses a Krueger
CSP-5001 controller-actuator (see Fig. 13).
The system provides for independently adjustable set points
for minimum, maximum, and auxiliary airflow limits.
Room temperature control is provided by the associated
room thermostat which is selected according to the application.
The room thermostat provides a fixed 2 degrees F reset span re-
gardless of the minimum and maximum velocity limit set
points.
Adjustments for the minimum and maximum airflows are
made at the thermostat.
The thermostat (CTE-5100 series) operates on a 16 vdc
power supply from the CSP controller and outputs a 0 to
10 vdc signal on the T terminals; T
1
in the cooling mode (DA)
and T
2
in the heating mode (RA). See the reference sequence
diagram on unit for details on which ‘T’ terminals are used on
each model thermostat, but in general T
1
and T
3
are used for
the cooling mode, T
2
and T
4
for heating. Terminals T
1
and T
2
are adjustable to limit minimum and maximum flow. Terminals
T
3
and T
4
have a fixed 0 to 10 vdc output signal.
1. Required tools:
a.
1
/
16
in. hex/key wrench
b.
Small flat blade (
1
/
8
in.) screwdriver
c.
Digital voltmeter capable of displaying a 0 to
10 vdc range which will display in hundredths of
vdc
d.
HSO-5001 Test Leads (optional for meter taps)
2. Remove thermostat cover:
Thermostat cover is removed by loosening the setscrews
on each side of the thermostat. Using a
1
/
6
in. hex/key
wrench turn the setscrews clockwise until cover is loose.
3. Check voltages:
Verify 16 vdc between (+) and (–) terminals.
CONTROL SEQUENCE 2100 (Heating Only)
1. Be certain the ambient room temperature at the thermo-
stat is within the range of the thermostat (55 to 85 F).
2. Adjust the heating set point slider all the way to the left
for minimum heating.
3. Read the DC voltage across the meter taps on the heating
(left) side. Adjust the minimum set point (MIN INCR)
potentiometer (clockwise to increase or counterclockwise
to decrease) to the DC voltage equal to the desired air-
flow (cfm) as shown on the calibration curve (Fig. 14).
NOTE: The minimum set point must be adjusted
first
. Adjust-
ment of the MIN INCR potentiometer directly affects the max-
imum set point.
4. Adjust the heating set point slider all the way to the right
for maximum heating.
5. Read the DC voltage across the meter taps on the heating
(left) side. Adjust the maximum set point (MAX INCR)
potentiometer (clockwise to increase or counterclockwise
to decrease) to the DC voltage equal to the desired air-
flow (cfm) as shown on the calibration curve (Fig. 14).
NOTE: The maximum set point must be adjusted
last
. Adjust-
ment of the MIN INCR potentiometer directly affects the max-
imum set point.
6. Return the heating set point slider to the desired set point.
Insert set point slider stops. Replace thermostat cover.
MAX
MIN
F
L
O
W
0
3
8
13 psig
LO STAT
∆
P
HI STAT
∆
P
ROOM TEMPERATURE
DA HEATING*
Reset
Span
Reset Start*
∆
LO STAT
∆
P
MAX
MIN
F
L
O
W
13
8
3
0 psig
HI STAT
∆
P
ROOM TEMPERATURE
RA HEATING
Reset
Span
Reset Start
∆
MAX
MIN
F
L
O
W
13
8
3
0 psig
LO STAT
∆
P
HI STAT
∆
P
ROOM TEMPERATURE
RA COOLING*
Reset
Span
Reset Start*
∆
MAX
MIN
F
L
O
W
0
3
8
13 psig
LO STAT
∆
P
HI STAT
∆
P
ROOM TEMPERATURE
DA COOLING
Reset
Span
Reset Start
∆
T
H
L
B
M
NO
NC
G
RESET START
LO STAT
∆
P
RESET SPAN
HI STAT
∆
P
D A M P E R
I N C R
I N C R
TO DAMPER
ACTUATOR
TO MAIN AIR
SUPPLY
DIFFERENTIAL PRESSURE (FLOW)
LIMIT ADJUSTMENT WHEN T’STAT
PRESSURE IS HIGH (HI STAT)
(FACTORY SET AT 0.65 IN.WG.)**
**- FIELD ADJUSTMENT REQUIRED
DIFFERENTIAL PRESSURE (FLOW)
LIMIT ADJUSTMENT WHEN T’STAT
PRESSURE IS LOW (LO STAT)
(FACTORY SET AT 0 IN.WG.)**
ALL ADJUSTMENTS CCW TO INCREASE
(1/8”-5/32” FLATBLADE SCREWDRIVER)
RESET SPAN ADJUSTMENT
(FACTORY SET AT 5 PSI)
DAMPER ACTION SELECTION
(FACTORY SET AT NORMALLY OPEN)
NOTE: SCREW MUST BE TIGHT AND ARROWS
IN PERFECT ALIGNMENT FOR DEVICE TO FUNCTION PROPERLY.
LOOSEN SCREW TO
CHANGE DAMPER ACTION
(SUPPLIED IN N.O. POSITION)
GAGE TAP. LEAVE CAP ON UNLESS
CONNECTING GAGE FOR RESET
START OR RESET SPAN ADJUSTMENT
PUSH ON NIPPLES
FOR 3/16” (5) I.D.
FR TUBING (5)
* TO STATIC PRESSURE
TO TOTAL PRESSURE
*(DIFFERENCE IS: DIFFERENTIAL
PRESSURE, OR DEVICE
VELOCITY PRESSURE)
RESET START POINT ADJUSTMENT
(FACTORY SET AT 8 PSI)
TO THERMOSTAT BRANCH SIGNAL
(RESET SIGNAL)
*May require changing the RESET START from 8.0 to 3.0 psig if
sequencing is involved.
Fig. 12 — Reset Cycle for CSC-3011 Control
Fig. 11 — 3011 CSC Controller
ccw cw
E
C
RED-CLS
GRN-OPN
LED
METER
24V
AC
– +
I
N
NOR
MAX
MIN
N
O
M
M
A
X
%
M
I
N
˜
–
–
16
V
DC
O
U
I
H
L
45
90
0
∆
P PORTS
GEAR
DISENGAGEMENT
BUTTON
ADJUSTABLE
END STOPS
0-10V VELOCITY OUTPUT
0-10V INPUT SIGNAL
16V DC OUTPUT
(THERMOSTAT POWER)
COMMON (16V DC,
INPUT, OUTPUT)
POWER
SUPPLY
16
V
DC
I
N
O
U
T
24 V
AC
WIRING
–
–
˜
Fig. 13 — CSP-5001 Controller
