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Table 64. M3 Control Parameters
Control Parameter
DescriptionUnits
Control Value
No DescriptionUnitsMax.DefaultMin.Parameter Short DescriptionScreen Name
84 LAC SP TEMP 2
Low Ambient Outdoor Air Limit
Temperature 2 Setpoint
10.0 55.0 60.0 ºF
Low ambient outdoor air limit temp. 2. Parameters 83 and 84 are
used to shed fans.
See Operation section.
Temperature setting must be greater than or equal to Parameter
83.
85 COMP1 LO TMP LCKOUT
Low Ambient Temperature
Lockout for Compressor 1
-31.0
Check unit parameter
label as default may
be altered at factory
test.
80.0 ºF
Low ambient lockout for compressor 1.
A value of (-31°F) will disable low ambient lockout function.
Temperature setting must be less than or equal to Parameter 86.
86 COMP2 LO TMP LCKOUT
Low Ambient Temperature
Lockout for Compressor 2
-31.0
Check unit parameter
label as default may
be altered at factory
test.
80.0 ºF
Low ambient lockout for compressor 2.
A value of (-31F) will disable low ambient lockout function.
Temperature setting must be greater than or equal to Parameter
85 and less than or equal to Parameter 87.
87 COMP3 LO TMP LCKOUT
Low Ambient Temperature
Lockout for Compressor 3
-31.0 0.0 80.0 ºF
Low ambient lockout for compressor 3.
A value of (-31F) will disable low ambient lockout function.
Temperature setting must be greater than or equal to Parameter
86 and less than or equal to Parameter 88.
88 COMP4 LO TMP LCKOUT
Low Ambient Temperature
Lockout for Compressor 4
-31.0 0.0 80.0 ºF
Low ambient lockout for compressor 4.
A value of (-31F) will disable low ambient lockout function.
Temperature setting must be greater than or equal to Parameter
87
89 COMP MIN OFF DELAY Compressor Minimum Off Delay 60 300 510 Seconds Compressor minimum off delay.
91 COMP MIN RUN TIME Compressor Minimum Run Time 60 240 510 Seconds Compressor minimum run time.
98 MAX HP OCCURRENCES
Maximum High Pressure
Occurrences
1 3 8 Occurrences
Maximum High Pressure occurrences that are stored before control
locks off compressor stage and energizes the service output.
99 MAX LP OCCURRENCES
Maximum Low Pressure
Occurrences
1 3 8 Occurrences
Maximum Low Pressure occurrences that are stored before control
locks off compressor stage and energizes the service relay.
100 LP SW IGNORE TIME
Low Pressure Switch Ignore
Time
0 120 600 Seconds
Low Pressure Switch Ignore Time
101 CL STG 2 STGUP TIME
Maximum Stage 1 Cooling Time
Before Call for Stage 2 Cooling
0 912 3600 Seconds
Stage 2 stage up timer. The maximum time that cooling stage 1
runs before calling cooling stage 2.
Used in room sensor applications.
Disabled if set to 0.
102 CL STG 3 STGUP TIME
Maximum Stage 2 Cooling Time
Before Call for Stage 3 Cooling
0 912 3600 Seconds
Stage 3 stage up timer. The maximum time that cooling stage 2
runs before calling cooling stage 3.
Used in room sensor applications.
Disabled if set to 0.
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