Page 115
Table 64. M3 Control Parameters
Control Parameter
DescriptionUnits
Control Value
No DescriptionUnitsMax.DefaultMin.Parameter Short DescriptionScreen Name
164 ECONOMIZER PROFILE Economizer Profile 0 2 3 Option
These are the operating profile options for the economizer damper
during free cooling when any compressor is on and can be selected
as follows:
Option 0: Damper continues to modulate while compressors are on,
but the effect of mechanical cooling may force the damper closed to
its minimum position. After compressor starts, the free cooling set
point is lowered to a fixed temperature of 45°F.
Option 1: Damper opens to its maxopen position (Parameter 131 -
FREE CL MAX DAMPER) when any compressors start.
NOTE - When using Option 1 and after the compressor is stopped,
the M3 shall resume damper modulation.
Option 2: Damper continues to modulate while compressors are on,
but the effect of mechanical cooling may force the damper closed to
its minimum position. This is the factory default setting.
Holdsoff compressor on Y2 call until damper has modulated to
maximum position (Parameter 131 - FREE CL MAX DAMPER)
for three minutes.
After three minutes, compressor starts and the free cooling set
point is lowered to 45°F. Damper is not locked at maximum open
while compressor is on, but modulates to maintain 45°F discharge
air temperature.
When Y2 is satisfied, compressor goes off and free cooling set
point is restored to 55°F (Parameter 159 - FREE COOL SUPPLY
SP).
Option 3: Same as Option 2, but with a 10 minute delay instead of a
three minute delay.
System 2 Parameters
165 FAH STAGE DIFFER
Fresh Air Heating Stage
Differential
0.0 2.0 20.0 °F
Fresh Air Heating stage differential.
0 value for first stage heating only for Fresh Air Heating.
166 FAH REHEAT OAT SP
Fresh Air Heating Control
Reheat Outdoor Air
Temperature Setpoint
20.0 45.0 60.0 °F
Outdoor air temperature set point that enables fresh air heating for
reheat demand and opens damper to Parameter 167 when outdoor
air is less than set point.
167 FAH REHEAT DAMPER
Fresh Air Heating Control
Reheat Damper Position
5.0 40.0 100.0 % Fresh air damper position during Fresh Air Heating reheat operation.
168 FAH REHEAT SP Fresh Air Heat Control Setpoint 40.0 40.0 70.0 °F Fresh Air Heating Reheat set point.
169 FAT AUTO CHGOVR DLY
Fresh Air Tempering Automatic
Changeover Delay
896 1792 7200 Seconds
Fresh Air Heating Control or Fresh Air Cooling Control air Tempering
auto-changeover delay.
170 FRESH AIR COOL SP Fresh Air Cooling Setpoint 60.0 90.0 90.0 °F
Fresh Air Cooling set point.
To enable Fresh Air Cooling Control, set this to a value between
60°F and 90°F.
171 FAC STAGE DEADBAND
Fresh Air Cooling Control
Deadband
3.0 10.0 15.0 °F Fresh Air Cooling stage dead-band.
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