Lennox Core Unit Controller Setup Manual page 39

SELECTED ALARMS (MARKED WITH * IN TAbLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
DISPLAY MESSAGE
CODE
18 HIGH PRESS S96 OPEN COMP4
STRIKE3 HIGH PRESS S96 OPEN
19*
COMP4
NOTE: EVENTS 12 THROUGH 19 COULD ALSO BE CAUSED BY A HIGH TEMPERATURE CONDITION ON SOME COMPRESSORS EQUIPPED
WITH A HIGH TEMPERATURE SHUTDOWN.
20 PHASE MONITOR
21 RESERVED
22 LOW PRESS S87 OPEN COMP1
STRIKE3 LOW PRESS S87 OPEN
23*
COMP1
24 LOW PRESS S88 OPEN COMP
STRIKE3 LOW PRESS S88 OPEN
25*
COMP2
26 LOW PRESS S98 OPEN COMP
STRIKE3 LOW PRESS S98 OPEN
27*
COMP3
28 LOW PRESS S97 OPEN COMP
STRIKE3 LOW PRESS S97 OPEN
29*
COMP4
30* OVERFLOW SWITCH
31 STRIKE3 UNIT SHUTDOWN S149
32 FRZ STAT S49 OPEN COMP1
33* STRIKE3 FRZ STAT S49 OPEN COMP1
34 FRZ STAT S50 OPEN COMP2
35* STRIKE3 FRZ STAT S50 OPEN COMP2
36 FRZ STAT S53 OPEN COMP3
Table 11. CORE Control System Alarm and Event Codes
EVENT ACTION
• Compressor lockout. Check charge, fans and coil.
• The CORE Unit Controller will clear high pressure switch alarm when corresponding
high pressure switch is detected as closed. Compressor will not be restarted until
corresponding high pressure switch is closed and Minimum Off Delay (cooling or
heating) has expired.
• Compressor lockout. Check charge, fans and coil. Use service menu to clear
lockouts.
• User will be able to clear high pressure switch compressor lockout and alarm via user
interface. High pressure switch compressor lockout and alarm will be cleared after
the CORE Unit Controller reset.
• High pressure switch compressor lockout and alarm is cleared on removal of cooling
demand. Default is 3 occurrences and can be set between 1 and 7 occurrences.
Phase monitor or blower motor overload switch or inverter fault output or condensate
overflow switch is indicating an issue.
Compressor is off. Check charge, fans and coil. Use service menu to clear lockouts.
• Compressor is off. Check charge, fans and coil. Use service menu to clear lockouts.
• Number of occurrences is set using Parameter 99 (max lo occurrences). Default is 3
occurrences.
Compressor is off. Check charge, fans and coil.
• Compressor is off. Check charge, fans and coil. Use service menu to clear lockouts.
• Number of occurrences is set using Parameter 99 (max lo occurrences). Default is 3
occurrences.
Compressor if off. Check charge, fans and coil.
• Compressor is off. Check charge, fans and coil. Use service menu to clear lockouts.
• Number of occurrences is set using Parameter 99 (max lo occurrences). Default is 3
occurrences.
Compressor if off. Check charge, fans and coil.
• Compressor is off. Check charge, fans and coil. Use service menu to clear lockouts.
• Number of occurrences is set using Parameter 99 (max lo occurrences). Default is 3
occurrences.
• Check for block drain, condensate lines and drain pan overflow switch.
• Alarm set if overflow switch is detected opened and compressor will be locked out.
System will automatically clear alarm once switch is detected closed. System will
resume operation (compressor lockout), after the Error Timed OFF Delay has expired
following the Overflow switch alarm clear.
S149 input is open, condensate overflow switch; multiple times.
Compressor is off. Check freezestat, air flow, charge, coil, air filter and outside air
temperature.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Number of occurrences is set using Parameter 81 (max freeze sat occ). Default is 3
occurrences.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Number of occurrences is set using Parameter 81 (max freeze sat occ). Default is 3
occurrences.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
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