5284792-UIM-D-1017
10
Johnson Controls Unitary Products
Status Code Display
The main control board contains 2 LED’s for status and fault display as
shown in Figure 10. The control will provide a status code indicating the
state of the system using the Yellow LED as detailed in Table 5. The
Red LED indicates a system fault is present. Further details of the fault
can be found on the outdoor screen.
SECTION VIII: OUTDOOR SCREEN OPERATION
The system is provided with an advanced screen to assist in unit com-
missioning and troubleshooting. Operating pressures and temperatures
from the system sensors are displayed in a format emulating a set of
refrigerant gauges. Full description text is scrolled across a banner dis-
play to show current system operation and status. A menu structure for
the outdoor display can be found in Table 6 and general operation is
detailed in the following pages.
GENERAL DISPLAY OPERATION
1. During an Active Call
A. Display Current system values:
Value
• COMPRESSOR SPEED (RPM)
• OD FAN SPEED (RPM)
• EEV STEP (ID Status)
• EEV STEP (OD Status)
• ID FAN SPEED (CFM)
• INPUT CURRENT (AMPS) -From Inverter Input
• INPUT VOLTAGE (VOLTS) -From Inverter Input
• INPUT WATTS (WATTS) -From Inverter Input
Equipment Status information will scroll sequentially on a continuous
loop, example below.
Continuous Loop Example:
COMPRESSOR (RPM) * OD FAN (RPM) * EEV STEP (ID EEV)
* EEV STEP (OD EEV) * ID FAN (CFM) * INVERTER (APMS)
* INVERTER (VOLTS) * INVERTER (WATTS)
2.
No Active Call, High Voltage is applied
The control will scroll and display * STANDBY * when there are no
active calls for compressor operation.
TABLE 4:
Same Priority Fault Storage
Control
Description
Time of
Fault
Fault
Priority
Inverter Control Fault
Microelectronic Fault
10:15:00
1
Outdoor Control Fault
Inverter Control
Communications Fault
10:15:01
1
TABLE 5:
Status Code Display
Description
Required Condition
LED
Color
No power to control
No power to control
OFF
OFF
Control Failure
Control failure occurs and
can be detected.
ON
Yellow
System has 24 VAC present and the microprocessor is active.
No faults active
2s ON / 2s OFF (“Heartbeat”)
Yellow
Control normal operation – in ASCD period
No faults/events active,
compressor speed > 0, ASCD
timer not expired
0.1 sec ON / 0.1 sec OFF
Yellow
System is active and presently communicating successfully.
No faults/events active,
compressor speed > 0, ASCD
timer not expired
0.5 sec ON / 0.5 sec OFF
Yellow
FIGURE 11:
Outdoor Display
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