Technical Guide
MUA II Controller
12
Start-up & Commissioning
In order to have a trouble free start-up it is important to follow a few
simple procedures. Before applying power for the first time it is very
important to correctly address the controller and run through a few simple
checks.
Controller Addressing
All MUA II controllers are equipped with address switches. If the
MUA II controller is to operate as a stand alone system (not connected
to any other controllers) the controller address switch should be set for
address 1. When using the Modular Service Tool or System Manager to
program and configure the MUA II controller you would enter this
address to communicate with the controller. When the system is to be
connected to other HVAC unit controllers on a communication loop,
each controllers address switch must be set with a unique address be-
tween 1 and 59. See Figure 15 for address switch setting information.
For detailed information regarding communication wiring and connec-
tion for interconnected and networked systems, please see the Orion
System Installation & Troubleshooting Guide.
Power Wiring
One of the most important checks to make before powering up the
system for the first time, is to confirm proper voltage and transformer
sizing for the controller. Each MUA II controller requires 10 VA of
power delivered to it at 24 VAC. Each 2 slot expansion board requires 5
VA at 24 VAC and each 4 slot expansion board requires 10 VA at 24 VAC.
You may use separate transformers for each device (preferred) or power
several devices from a common transformer. If several devices are to be
powered from a single transformer correct polarity must be followed.
Warning:
Observe Polarity! All boards must be wired with
GND-to-GND and 24 VAC-to-24 VAC. Failure to
observe polarity will result in damage to one or more
of the boards. Expansion Boards must be wired in
such a way that power to both the expansion boards
and the controller are always powered together. Loss
of power to the expansion board will cause the
controller to become inoperative until power is
restored to the expansion board.
Check all wiring leads at the terminal block for tightness. Be sure that
wire strands do not stick out and touch adjacent terminals. Confirm that
all sensors required for your system are mounted in the appropriate lo-
cation and wired into the correct terminals on the MUA II controller. Be
sure any expansion boards connected to the MUA II controller are also
correctly wired just as you did for the MUA II controller.
After all the above wiring checks are complete, apply power to the
MUA II controller and all expansion boards connected to it.
4
NETWORK
TOKEN
16
32
8
SW1
ADD
2
1
ADDRESS
V6
POWER
GND
24VAC
L1
D16
R6
C9
SC1
R1
1
U1
1
D13
C16
VR2
TB4
R27
C13
R10
VR1
C19
C18
R7
D10
R13
D12
C7
CX10
U10
CX12
U12
U14
CX14
PJ3
PJ2
PJ1
EXPANSION
PRESSURE
SENSOR
C17
D15
R26
C20
R25
R24
R22
U15
CX13
U13
C15
R19
R15
C14
D18
D17
PU1
PU2
PU3
PU4
PU5
PU7
D6
D7
D8
D9
D11
D14
C12
C10
0-5
VDC
0-1
VDC
JP1
C1
1
X2
GND
TB3
INPUTS
GND
GND
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
AOUT1
AOUT2
AIN7
RN5
D19
CX15
16
32
TOKEN
NETWORK
8
4
2
1
Address Switch Shown Is
Set For Address 1
Address Switch Shown Is
Set For Address 13
Controller
Address Switch
This Switch Should Be
In The OFF Position
As Shown
Note:
The Power To The Controller Must Be Removed And
Reconnected After Changing The Address Switch Settings
Caution
Disconnect All Communication Loop Wiring From The
Controller Before Removing Power From The Controller.
Reconnect Power And Then Reconnect Communication Loop
Wiring.
ADDRESS
ADD
ADDRESS
ADD
ADDRESS
ADD
The Address For Each Controller
Must Be Unique To The Other Controllers
On The Local Loop And Be Between 1 and 59
Figure 15: MUA II Controller Address Switch Setting
