Lennox Core Unit Controller Setup Manual page 52

Control
Parameter Screen Name
No
HT GAS BLR ON
66
DELAY
HT GAS BLR
67
OFF DLAY
HT GAS HI FIRE
69
DLAY
HT GAS OFF
70
DELAY
MAX CAI PRF
71
SW OCC
MAX CAI NO
72
PRF OCC
MAX GV SENSE
73
OCC
HT GAS STG UP
74
TMR
HT GAS STG
75
DWN TMR
COOL DOWN
78
DELAY
COOL BLR ON
79
DELAY
COOL BLR OFF
80
DELAY
MAX FREEZE
81
STAT OCC
COND FAN
82
RESTRT DLY
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
Gas Blower
On Delay After 8
Heating Demand
Gas Blower
Off Delay After
80
Heading Demand
Termination
Gas Minimum
Low Fire Time 30
Prior to High Fire
Heating Off Delay
30
Timer
Maximum
Combustion
Air Inducer
Proof Switch
1
Occurrence
Setting Prior To
Service Output
Energized.
Maximum
Combustion
Air Inducer 1
Proof Switch
Occurrences
Maximum Gas
Valve Sense
Occurrences
1
Stored Prior to
Service Output Is
Energized
Gas Stage Up
0
Timer
Gas Stage Down
0
Timer
block 4 Cooling Parameters
Cool Down Time
0
Delay
Cooling Blower
0
On Time Delay
20 for defaults.
Cooling Blower
0
Off Time Delay
Maximum Freeze
Thermostat 1
Occurrence
Condenser Fan
Restart Time 0
Delay
Control Value
Default Max.
System
60
Dependent
System
300
Dependent
100 300
100 300
3 5 Occurrences
3 15 Occurrences
3 5 Occurrences
912 3600
0 3600
30 136
See section
3.3.9. on page 60
See section
3.3.10. on
240
page 20 for
defaults.
3 3 Occurrences
6 16
52
Units Description
The time before the blower turns on after
Seconds
a heating demand.
The time the blower stays on after the
Seconds
heating demand is terminated.
The minimum low fire time before high
Seconds
fire is allowed.
Seconds Heating off delay.
Service relay activation. Maximum
combustion air Inducer proof switch
occurrences stored before service output
is energized.
After the initial maximum combustion air
Inducer proof switch closure, the system
will continue to monitor the pressure
switch and set alarm if three open
occurrences are detected
Service output activation. Maximum gas
valve sense occurrences stored before
service output is energized.
NOTE: Heating stage is not locked out.
• Stage-up timer. The maximum time
that lower stage runs before calling
next heat stage. Used in room
Seconds
sensor applications.
• Disabled if set to 0.
• Time delay before a lower stage
turns off following a higher stage
Seconds
termination.
• Used in room sensor applications.
• Cool down time delay. Time that Y2
is ignored during cool down period
(when first occupied + cool demand)
Minutes
• This delay is only used if an
economizer is used and the outdoor
air is suitable.
The time before the blower turns on after
Seconds
a cooling demand.
The time the blower stays on after the
Seconds
cooling demand is lost.
Service output activation and compressor
lockout. Maximum freeze thermostat
occurrences are stored before service
relay is energized and compressor is
locked-out.
Low ambient anti-windmilling condenser
fan delay. The time period that the last
Seconds
operating fan is turned off before starting
the next fan.