86
IMPORTANT
For fresh air tempering modes to operate properly, the RT6 discharge sensor must be relocated to the supply air duct.
22.1.3.4.
Discharge Air Cooling Reset Operation
Discharge air cooling reset operation saves energy by gradually increasing the discharge air set point as outside air
temperature decreases. This operation also reduces the potential for over-cooling if the zoning system is misapplied, has
an abnormal condition, or has a dominant zone. The M3 unit controller has various Advanced discharge air cooling reset
options which can be selected at start up and are based on either return air temperature, outside air temperature, or both
return and outdoor air temperature.
22.1.3.5.
Discharge Air Heating Reset Operation
Discharge air heating reset operation saves energy by gradually decreasing the discharge air set point as outside air
temperature increases. This operation reduces the potential for overheating if the zoning system is misapplied, has an
abnormal condition, or has a dominant zone. The M3 unit controller has various advanced discharge air heating reset
options which can be selected at start up and are based on either return air temperature, outside air temperature or both
return and outdoor air temperature.
22.1.3.6.
Damper Position Control of Exhaust Fan (Building Pressure)
Energence units can control building static pressure with either a standard or high static power exhaust fan. Each fan type
is available in either a 50% (one fan) or 100% (two fans) configuration. Standard static power exhaust fans use a propeller
while high static power exhaust fans use a centrifugal blower. All units featuring power exhaust fans must also have an
economizer.
Control of the fans can occur based on damper position or building differential static pressure transducers located outside
the building and in the return duct. Control of power exhaust fans can occur through the M3 unit controller, third-party
device or separate M3 unit controller.
Table 55. Exhaust Fan Parameters
Control Parameter
Control Value
Units
Description
No
Screen Name
Parameter Short
Description
Min.
Default
Max
.
215
EXH FN STG1 DAMP SP
Exhaust Fan Stage 1 Damper
Set Point
0.0
50.0
100.0
%
Exhaust Fan stage 1 damper
set point.
216
EXH FN STG1 DAMP DB
Exhaust Fan Stage 1 Damper
Deadband
0.0
Check unit
parameter
label as
default
may be
altered af
factory
test.
100.0
%
Exhaust Fan Stage 1 Damper
Deadband
219
EXH FN STG2 DAMP SP
Exhaust Fan Stage 2 Damper
Set Point
0.0
70.0
100.0
%
Exhaust Fan Stage 2 Damper
Set Point
220
EXH FN STG2 DAMP DB
Exhaust Fan Stage 2 Damper
Deadband
0.0
10.0
100.0
%
Exhaust Fan Stage 2 Damper
Deadband
223
EXH FAN STGUP DELAY
Exhaust Fan Stage Up Delay
0
0
300
Sec
Exhaust Fan Stage Up Delay
224
EXH FAN STGDWN DLAY
Exhaust Fan Stage Down Delay
0
100
200
Sec
Stage 1 off-delay. (Only used
for 2 stage operation)
