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Table 64. M3 Control Parameters
Control Parameter
DescriptionUnits
Control Value
No DescriptionUnitsMax.DefaultMin.Parameter Short DescriptionScreen Name
69 HT GAS HI FIRE DLAY
Gas Minimum Low Fire Time
Prior to High Fire
30 100 300 Seconds The minimum low fire time before high fire is allowed.
70 HT GAS OFF DELAY Heating Off Delay Timer 30 100 300 Seconds Heating off delay.
71 MAX CAI PRF SW OCC
Maximum Combustion Air
Inducer Proof Switch
Occurrence Setting Prior To
Service Output Energized.
1 3 6 Occurrences
Service relay activation. Maximum Combustion Air Inducer proof
switch occurrences stored before service output is energized.
72 MAX CAI NO PRF OCC
Maximum Combustion Air
Inducer Proof Switch
Occurrences
1 3 6 Occurrences
After the initial Maximum Combustion Air Inducer proof switch clos
ure, the system will continue to monitor the pressure switch and set
alarm if three open occurrences are detected
73 MAX GV SENSE OCC
Maximum Gas Valve Sense
Occurrences Stored Prior to
Service Output Is Energized.,
1 3 6 Occurrences
Service output activation. Maximum Gas Valve Sense occurrences
stored before service output is energized.
Note: Heating stage is not locked out.
74 HT GAS STG UP TMR Gas Stage Up Timer 0 912 3600 Seconds
Stage-up timer. The maximum time that lower stage runs before
calling next heat stage. Used in room sensor applications.
Disabled if set to 0.
75 HT GAS STG DWN TMR Gas Stage Down Timer 0 0 3600 Seconds
Time delay before a lower stage turns off following a higher stage
termination.
Used in room sensor applications.
Block 4 Cooling Parameters
78 COOL DOWN DELAY Cool Down Time Delay 0 1792 8160 Seconds
Cool down time delay. Time that Y2 is ignored during cool down
period (when first occupied + cool demand)
This delay is only used if an economizer is used and the outdoor
air is suitable.
79 COOL BLR ON DELAY Cooling Blower On Time Delay 0 0 60 Seconds The time before the blower turns on after a cooling demand.
80 COOL BLR OFF DELAY Cooling Blower Off Time Delay 0 0 240 Seconds The time the blower stays on after the cooling demand is lost.
81 MAX FREEZE STAT OCC
Maximum Freeze Thermostat
Occurrence
1 3 3 Occurrences
Service output activation and compressor lockout. Maximum freeze
thermostat occurrences are stored before service relay is energized
and compressor is locked-out.
82 COND FAN RESTRT DLY
Condenser Fan Restart Time
Delay
0 6 16 Seconds
Low ambient anti-windmilling condenser fan delay. The time period
that the last operating fan is turned off before starting the next fan.
83 LAC SP TEMP 1
Low Ambient Outdoor Air Limit
Temperature 1 Setpoint
10.0 40.0 60.0 ºF
Low ambient outdoor air limit temp. 1. Parameters 83 and 84 are
used to shed fans.
See Operation section.
Temperature setting must be less than or equal to Parameter 84.
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