17
Fig. 13 — ACU ECM Controller
ACU-P, 2-10VDC (4-20MA) INPUT (CONTROL OPTION 8)
Another option is to have the board factory set to allow for on/
off control by setting the jumper on to the “P” position. This set-
ting uses a 2-10 Vdc control signal range with a voltage signal
under 2 Vdc turning the motor off. See Fig. 13 for graph of oper-
ating range.
PNEUMATIC CONTROLS
General — Single Function Pneumatic Controller
Control Sequences (1300-1305, 1400-1401)
To properly balance the system, all ductwork and outlets must
be installed and connected tightly. Reference piping/wiring dia-
gram on unit for specifics for the control sequence selected for
the unit.
Units with Single-Function Controllers
1. Determine sequence of operations (reverse-acting, normal-
ly closed [RANC], direct-acting, normally open [DANO]).
This can be accomplished by reading the diagram affixed
to the unit. The standard RANC controller is gray colored;
the DANO controller is beige. See Fig. 14-16.
2. Check that main air pressure at the controller. Main air
should equal 18 to 25 psi. Main air must be clean and dry.
3. Check for primary airflow in the inlet duct, using a differ-
ential pressure sensor tapped into the differential pressure
sensor signal line tees.
4. Verify that the installed room thermostat is compatible with
the unit control.
5. Close the primary air damper.
a. RANC — disconnecting the actuator from the con-
troller should allow the damper to close completely.
b. DANO — connecting to 20 psi air supply directly to
the actuator should close the damper completely.
6. Start the blower motor by doing one of the following:
45J,K,Q Units:
Both RANC and DANO — Connect electrical power to
the blower motor control.
45M,N,R Units:
RANC — Connect the main air line to the blower control,
bypassing the thermostat input.
DANO — Disconnect the thermostat line from the blower
controls.
These steps should energize the fan.
Fig. 14 — Pneumatic Volume Controller (Normally
Open) for Pneumatic Control Unit (Beige Color)
Fig. 15 — Pneumatic Volume Controller (Normally
Closed) for Pneumatic Control Unit (Gray Color)
NOTE: Both ACU Options provide a manual Override
for field setting the ECM motor without being connected
to a DDC controller. If a DDC controller is connected,
adjusting the manual override with lock out the
automation signal for 15 minutes.
JUMPER SETTING
V
olt
s
0-10Vdc
2-10Vdc with
On/Off
“Opt” J
u
mper
“P” J
u
mper
10
9
8
7
6
5
4
3
2
1
0
0 10 20
3
0 40 50 60 70
8
0 90 100
Flow Index
HI
LO
CSC-2003
0-1” P
D.A.
DMPR. N
.O.
IN
CRE
ASE
IN
CRE
ASE
HI
LO
CSC-2004
0-1” P
R.A.
DMPR. N
.C.
IN
CRE
ASE
IN
CRE
ASE
