Economizer - Daikin Maverick I Installation And Maintenance Manual

Min DAT Spt
The Minimum DAT set point is used to create warnings in the
system.
Max DAT Spt
The Maximum DAT set point is used to create warnings in the
system.
Stpnt Adj Enable
If the set point adjustment is enabled, then the control will
consider the hardwired potentiometer input to determine
occupied set points only. If the remote set point adjustment is
enabled but the input reads an invalid number, the control will
default back to the occupied set point selection.
Setpoint Adjust
This is the actual reading of the potentiometer set point "Stpnt
Adj Enable".
Cooling Lockout Temperature
If the outdoor air temperature is below the cooling lockout
temperature the control will prevent the operation of
mechanical cooling. The default cooling lockout temperature
is 35°F with a range of adjustment from 30°F to 50°F and the
cooling lockout resets at 5°F above the set point. As an
example, if the setting is 40°F and the compressors are not
operating due to low outdoor air temperature, then the DDC
Controller will only allow the operation of mechanical cooling
again once the OAT reading exceeds 45°F.
Heating Lockout Temperature
If the outdoor air temperature is above the heating lockout
temperature the control will prevent the operation of heating.
The default heating lockout temperature is 90°F with a range
of adjustment from 70°F to 90°F and the heating lockout resets
at 5°F below the set point.

Economizer

This screen shows the information available from the
Economizer. When this device is not connected, the control
will show the word "Unavailable" on the second line of the
display.
The Economizer uses controllable dampers to increase the
amount of outside-air intake into the building whenever
enabled and whenever outside air enthalpy is favorable for
conditioning the ambient.
The DDC Controller board communicates to the Economizer
Logic Module (ELM) via RS485. Once the ELM receives
communication from the main control indicating a cooling
demand, the ELM will calculate the outdoor air enthalpy and
determine if the economizer operation is favorable for
conditioning the ambient. The main control will read the status
of the economizer and determine whether it is a valid stage for
cooling or not.
McQuay OM 1077
If mechanical cooling is active and the enthalpy is favorable
for ELM operation, the DDC Controller will override the
Economizer opening the damper 100%. ELM will regain
control of the damper whenever mechanical cooling is no
longer necessary.
If operating from a thermostat, the Economizer is the first
stage of cooling. If the unit has two compressors available, the
second stage will never be active as long as free cooling is
available.
When the DDC Controller is operating from its local
temperature sensors, the Economizer is also a first stage of
cooling, if free cooling is available. First and second stages of
mechanical cooling may be necessary for satisfying the
demand in case the temperature trend towards the set point is
not large enough. Whenever mechanical cooling is active,
DDC Controller overrides the Economizer, opening the
damper 100%.
Table 11: Demand Control Ventilation
Economizer
Econ. Status Economizer OK / Economizer Not OK
Econ. Status Diff Enthalpy / Single Enthalpy
Econ. Status
* Enthalpy Setpt.
Eff.Mix.Air Temp
* Mixed Air Setpt.
Ext.Mix.Air Temp
* Econ. Vent. Limit
* Econ.Exh. On/off
* Econ. DCV Limit
DCV Control
* DCV Level Setpt.
Ext. DCV Level
Eff. DCV Level
Eff.Eco.Position
Eff.Min.Position
Local. Min. Pos.
Econ. Faults
Econ Firm Vrsn
* Menus that are user adjustable
Economizer Status
This screen confirms if the enthalpy is acceptable for
economization.
Economizer Status
This screen indicates if the system is using single or
differential enthalpy.
User Interface
Adjustable Range
Exh. Fan is ON/OFF
A/B/C/D/E
XXX.X °F
0 - 99
0 - 100
0 - 100
0 - 100
Enabled / Disabled
500 - 2000 ppm
DCV Sensor Fault
OAE Sensor Fault
RAE Sensor Fault
MAT Sensor Fault
Default
setting
A
45
0
50
0
Disabled
700
0103
19