Orion System MODGAS-X - Manual (Page 17)

MODGAS-X Field Technical Guide
LCD DISPLAY SCREENS
17
Status & Alarm Screens
Status Screens
Refer to the following map when navigating through the Status
Screens. From the STATUS Screen, press
to scroll
through the screens.
STATUS
MODE
HEAT
VLV POS
100%
SA TEMP
XX.X
ACTIV SP
XX.X
Alarm Screens
Refer to the following map when viewing Alarm Screens. These
screens will display automatically when alarms are present. For
alarm troubleshooting, see pages 19 & 20.
SUPPLY AIR TEMPERATURE
40ºF to 200ºF or 5ºC to 93ºC.
If no sensor is detected, screen will display “NO SENSR”
ALARMS
Status Screens shown below will scroll automatically if LCD display is
left on this screen for 20 seconds.
MODE
This screen displays the current mode of operation of the MODGAS-X
Controller. The mode options are:
OFF: This mode will display when there is no call for heat and heating
has been disabled.
HIGH FIRE: Each time Heat is activated, the unit will fi rst go into High
Fire Mode. During this mode, the unit will remain at maximum fi re. The
unit will leave this mode once proof of fi re has been established.
HEAT: After High Fire, the unit will enter the Heat Mode and will begin
to modulate the gas valve to maintain the Heating Supply Air Setpoint
(SAT). The unit must remain in this mode for a minimum run time of 1
minute. While in Heat Mode, the screen will display the staging status—
HEAT STAGE 1 to STAGE 16. If Modulating Staged Heat, the screen will
display MOD HEAT. Once the call for heat goes away, the unit will leave
the Heat Mode.
CUTOFF: The Cutoff Mode occurs if the SAT rises above 200˚F. During
Cutoff Mode, the Heat will be disabled for a fi xed delay period. If the SAT
falls below 200˚F and the delay period has expired, the unit will re-enter
the Heat Mode.
FORCE: Force Mode.
SAT FAIL: The Supply Air Temperature sensor has been disconnected
for more than 60 seconds. This alarm will be disabled when the sensor
is reconnected.
VALVE POSITION
0 to 100 percent
ACTIVE SUPPLY AIR SETPOINT
Calculated from SAT setpoint and reset signal in stand-alone mode. In
communicating mode, the Main Controller sends the setpoint.
ALARMS
The alarms are as follows:
NO ALARMS: This will be shown if there are no current alarms.
SAT CUTOFF: This indicates a Supply Air Temperature Cutoff Alarm
condition which is activated if the SAT has risen above 200ºF. The alarm
will go away if after a fi xed delay period the SAT has dropped below
200ºF.
MECH FAILURE: The unit has been in High Fire Mode for more time
than the mechanical failure delay period. This alarm will be disabled
when the unit leaves High Fire Mode.
SAT FAIL ERROR: The Supply Air Temperature sensor has been dis-
connected for more than 60 seconds. This alarm will be disabled when
the sensor is reconnected.
COMM T/O ERROR: Communications have been lost with the main
controller. This alarm will disable when communications resume.
FAN SPD
OFF,HIGH,LOW
FAN SPEED
OFF, HIGH, LOW