Lennox Core Unit Controller Setup Manual page 53

Control
Parameter Screen Name
No
83 LAC SP TEMP 1
84 LAC SP TEMP 2
COMP1 LO TMP
85
LCKOUT
COMP2 LO TMP
86
LCKOUT
COMP3 LO TMP
87
LCKOUT
COMP4 LO TMP
88
LCKOUT
COMP MIN OFF
89
DELAY
COMP MIN RUN
91
TIME
MAX HP
98
OCCURRENCES
MAX LP
99
OCCURRENCES
LP SW IGNORE
100
TIME
CL STG 2
101
STGUP TIME
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
Low Ambient
Outdoor Air Limit
10
Temperature 1
Set Point
Low Ambient
Outdoor Air Limit
10
Temperature 2
Set Point
Low Ambient
Temperature
-31
Lockout for
Compressor 1
Low Ambient
Temperature
-31
Lockout for
Compressor 2
Low Ambient
Temperature
-31
Lockout for
Compressor 3
Low Ambient
Temperature
-31
Lockout for
Compressor 4
Compressor
Minimum Off 60
Delay
Compressor
Minimum Run 60
Time
Maximum
High Pressure 1
Occurrences
Maximum
Low Pressure 1
Occurrences
Low Pressure
Switch Ignore 0
Time
Maximum Stage
1 Cooling Time
0
Before Call for
Stage 2 Cooling
Control Value
Default Max.
40 60
55 60
Default may
be altered at 80
factory test.
Default may
be altered at 80
factory test.
Default may
be altered at 80
factory test.
Default may
be altered at 80
factory test.
300 510 Seconds
240 510 Seconds
3 7 Occurrences
3 7 Occurrences
120 600 Seconds
912 3600 Seconds
53
Units Description
• Low ambient outdoor air limit temp.
1. Parameters 83 and 84 are used
to shed fans.
ºF
• Temperature setting must be less
than or equal to Parameter 84.
• Low ambient outdoor air limit temp.
2. Parameters 83 and 84 are used
to shed fans.
ºF
• Temperature setting must be greater
than or equal to Parameter 83.
• Low ambient lockout for compressor
1.
• A value of (-31°F) will disable low
ºF
ambient lockout function.
• Temperature setting must be less
than or equal to Parameter 86.
• Low ambient lockout for compressor
2.
• A value of (-31ºF) will disable low
ºF ambient lockout function.
• Temperature setting must be greater
than or equal to Parameter 85 and
less than or equal to Parameter 87.
• Low ambient lockout for compressor
3.
• A value of (-31ºF) will disable low
ambient lockout function.
ºF
• Temperature setting must be greater
than or equal to Parameter 86 and
less than or equal to Parameter 88.
• Low ambient lockout for compressor
4.
• A value of (-31ºF) will disable low
ºF
ambient lockout function.
• Temperature setting must be greater
than or equal to Parameter 87.
Compressor minimum off delay.
Compressor minimum run time.
Maximum High Pressure occurrences
that are stored before control locks off
compressor stage and energizes the
service output.
Maximum Low Pressure occurrences
that are stored before control locks off
compressor stage and energizes the
service relay.
Low Pressure Switch Ignore Time
• 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.