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OM 1077-1 • MAVERICK I
Economizer Status
This screen confirms if the enthalpy is acceptable for
economization.
Enthalpy Status
This screen indicates if the system is using single or
differential enthalpy.
Exhaust Status
This screen gives the status of the exhaust fan.
Enthalpy Set Point
The user has five levels to choose for the enthalpy set point.
indicates what each of those levels represents in the
psychometric chart. This setting determines the level at which
economization is allowed. This setting is only adjustable at
economizer potentiometer.
Figure 10: Demand Control Ventilation
Effective Mixed Air Temperature
This is the current value of mixed air temperature.
Mixed Air Set Point
When the mixed air temperature falls below this set point, the
freeze protection control will disable the mixed air control and
close the outdoor damper to the effective minimum position.
External Mixed Air Temperature
This screen corresponds to the discharge air temperature
reading from the DDC Controller.
Economizer Ventilation Limit
The ventilation limit corresponds to a minimum position of
the Economizer that complies with the minimum acceptable
outside-air ventilation rate. The volumetric flow-rate of outside
air required to provide healthful, comfortable conditions for
occupants can be determined from building codes, ASHRAE
standards, or standard practice. It is usually expressed in
terms of volumetric flow-rate (cfm) per occupant or per unit
floor area. The use of a CO
2
sensor can lower the ventilation
limit by verifying that the indoor air quality is suitable for human
occupancy, as described in the next section for Demand
Control Ventilation (DCV).
The system allows the adjustment of the ventilation limit
through four different methods, listed below in order of priority:
1. Network interface (BACnet, BAS, or
L
on
W
orks
)
2. Human Systems Interface (HSI)
3. Remote potentiometer
4. Direct adjustment through a potentiometer on ELM
control.
Economizer Exhaust ON/OFF
This screen allows the user to change the set point of what
percentage the exhaust fan is energized.
Economizer DCV Limit
The economizer will allow the dampers to close more than the
minimum position if the indoor air quality is not contaminated.
The Econ. DCV Limit can be set from 0 to 100% but must be
lower than the minimum position.
