JOHNSON CONTROLS
80
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 5 – SEQUENCE OF OPERATION
The economizer will become inactive and eliminate
the use of outdoor air for cooling when:
•
The outside air enthalpy is 1.0 BTU/LB greater
than the
“ECONOMIZER OUTSIDE AIR EN-
THALPY SETPOINT”
.
•
The Simplicity Control does not have an Occu-
pied or Unoccupied cooling demand.
Dual Enthalpy
The following parameters must be programmed to al-
low economizer operation:
•
“RETURN AIR HUMIDITY SENSOR IN-
STALLED”
– must be enabled using Parameter 38
under the PROGRAM key on the Simplicity con-
trol board or under the EQUIPMENT INSTAL-
LATION tab in the Simplicity PC software pack-
age.
•
“DIFFERENTIAL ENTHALPY MODE EN-
ABLED”
must be turned ON under the ECONO-
MIZER/EXHAUST tab in the Simplicity PC soft-
ware package.
The economizer will become active and use outdoor air
for cooling when:
•
The outside air enthalpy is 1.0 BTU/LB less than
the return air enthalpy.
•
The Simplicity Control has a demand for cooling
operation.
The economizer will become inactive and eliminate
the use of outdoor air for cooling when:
•
The outside air enthalpy is equal to or greater than
the return air enthalpy.
•
The Simplicity Control does not have an Occu-
pied or Unoccupied cooling demand.
BAS ECONOMIZER OPERATION
This feature allows the outdoor/return air damper to be
controlled by an external 2 to 10VDC input.
The following parameters must be programmed to al-
low BAS ECONOMIZER OPERATION:
•
“ECONOMIZER INSTALLED”
- must be dis-
abled using Parameter 32 under the PROGRAM
key on the Simplicity Control board or under the
ECONOMIZER/EXHAUST tab in the Simplicity
PC software package.
•
“OUTSIDE AIR HUMIDITY SENSOR IN-
STALLED”
- must be disabled using Parameter
36 under the PROGRAM key on the Simplicity
Control board or under the EQUIPMENT IN-
STALLATION tab in the Simplicity PC software
package.
•
“RETURN AIR HUMIDITY SENSOR IN-
STALLED”
- must be disabled using Parameter
38 under the PROGRAM key on the Simplicity
Control board or under the EQUIPMENT IN-
STALLATION tab in the Simplicity PC software
package.
•
“THIRD PARTY BAS ECONOMIZER IN-
STALLED”
must be enabled using Parameter 58
under the PROGRAM key on the Simplicity Con-
trol board or under the EQUIPMENT INSTAL-
LATION tab in the Simplicity PC software pack-
age.
In order to use this feature a 2 to 10VDC external sig-
nal must be sent to the unit through the “BAS ECON
+” and “BAS ECON -” connections on the Unit Con-
trol board.
Sequence of Operation
The Unit Controller sends the 2 to 10VDC input signal
directly to the analog output terminals “ECO +” and
“ECO -” to the damper actuator. A 2 VDC input from
the external source will result in a 2 VDC signal to the
damper actuator.
If voltage is applied to the “BAS ECON
+” and “BAS ECON -” terminals before
“THIRD PARTY BAS ECONOMIZER
INSTALLED” is enabled the Unit Con-
troller can be damaged.
Constant Volume Economizer Setpoint
The following parameters must be programmed to al-
low economizer operation:
•
“ECONOMIZER FIRST STAGE SETPOINT”
–
must be programmed using Parameter 33 under
the PROGRAM key on the Simplicity control
board or under the ECONOMIZER/EXHAUST
tab in the Simplicity PC software package.
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