AAON ASM01891 User Manual

Zone
Zone
Two Condenser Head Pressure II Module Technical Guide
14
TROUBLESHOOTING
Figure 5: Two Condenser Head Pressure II Module Troubleshooting Diagram
Troubleshooting for Stand-Alone Mode
If you suspect or encounter general problems during operation
of the Two Condenser Head Pressure II Module while in Stand
Alone Mode, follow the Troubleshooting Flowchart in Figure
5, below.
Troubleshooting for Stand-Alone Mode
Is
“ERROR”
LED Blinking
?
Note: “STAT” LED
will blink the # of
Good sensors
connected
No
Is
“STAT”
LED
blinking correct
Sensors
?
Check wiring
on all sensors
Measure DC
Volts between
SIGx
&
GND for
All sensors
.
Compare readings
to chart
.
No
Enable
Inputs
?
BIN 2
Yes
Yes
Pressure is
??
than Setpoint
?
No
Monitor DC
Volts on A ut 1O
AutVoltageO1 & 2
Should Modulate
Up to a Max
Voltage of 10VDC
(See Sequence)
Higher
Monitor DC
Volts on
A ut 1 & 2 VoltageO
should Modulate
Down to a Min
voltage of 0VDC
(See Sequence)
Lower
There will
be No
Change on
A ut 1O& 2
Same
1 Blink =
None of the
Sensors are
Check wiring
on all sensors
Measure DC
Volts between
SIGx & GND for
all sensors
Compare readings
to chart
Yes
2
Blinks
=
High
Pressure on one
of the Sensors
(More than
500 PSI)
3 Blinks =
Lo Pressure
the Sensors
Less than 35 PSI
Check
Refrigerant
Charge on
All Circuits
Head Pressure Control
Troubleshooting Flowchart
(Stand-Alone Mode)
Start Here
Is
Blinking
?
No
Is
“ERROR”
LED Blinking
?
No
Is There
24VAC
@ “PWR”
Testpoint
?
No
Verify
Incoming
Power
No
Yes
Yes
Yes
Yes
“STAT” LED
Are
Heat
# of
Detected
Check
Refrigerant
Charge on
All Circuits
On one of
Active
&A ut 2O
A ut 1 & 2O
A& B
Call AAON
Technical
Support
Call AAON
Technical
Support
Call WattMaster
Technical
Support
Is
A or B Fan or
Condenser
Water Valve
Operating?
Fan Speed
Be at
100%
or Water Valve
Position Will

AAON ASM01891 Specifications

General

Brand	AAON
Model	ASM01891
Category	Control Unit
Language	English