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81
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
5
COMFORT VENTILATION
Comfort Ventilation is a Constant Volume control
mode that uses the economizer to control the supply
air temperature. When outdoor air conditions allow,
the economizer will modulate the outside / return air
mix to keep supply air temperatures within the upper
and lower Comfort Ventilation set points. The control
will modulate the economizer, and energize cooling or
heating if necessary, to keep the supply air temperature
within the Comfort Ventilation set points, even though
the space temperature requirements are satisfi ed.
The following criteria must be present in order for
Comfort Ventilation to function”:
• The unit can not be in an active heating or cooling
mode.
• The unit must have an economizer installed.
• The unit must be in the occupied mode.
• The unit should be placed in the continuous in-
door fan operation mode.
• The unit type must be Constant Volume.
The following parameters must be programmed:
“COMFORT VENTILATION FOR COOLING
ENABLED” - must be enabled under the COOLING
SETUP tab in the Simplicity PC software package.
“COMFORT VENTILATION FOR HEATING
ENABLED” - must be enabled under the HEATING
SETUP tab in the Simplicity PC software package.
“COMFORT VENTILATION UPPER SETPOINT” -
must be programmed under the COOLING SETUP or
HEATING SETUP tab in the Simplicity PC software
package.
“COMFORT VENTILATION LOWER SETPOINT” -
must be programmed under the COOLING SETUP or
HEATING SETUP tab in the Simplicity PC software
package.
TABLE 5-4 OPERATION DURING OFF CYCLE
OAT VS OAT COMFORT ZONE SAT VS SAT COMFORT ZONE ECON OPERATION HEAT STAGE COMP STAGE
BELOW ABOVE OPEN - -
BELOW BELOW - TURN ON
BELOW WITHIN - - -
ABOVE ABOVE - - TURN ON
ABOVE BELOW OPEN - -
ABOVE WITHIN - - -
WITHIN ABOVE OPEN - -
WITHIN BELOW OPEN - -
WITHIN WITHIN - - -
TABLE 5-5 COMPRESSOR ON WHEN SPACE INPUT SATISFIED
OAT VS OAT COMFORT ZONE SAT VS SAT COMFORT ZONE ECON OPERATION HEAT STAGE COMP STAGE
BELOW ABOVE OPEN - TURN OFF
BELOW BELOW - TURN ON TURN OFF
BELOW WITHIN - - TURN OFF
ABOVE ABOVE - - LEAVE ON
ABOVE BELOW OPEN - LEAVE ON*
ABOVE WITHIN - - LEAVE ON
WITHIN ABOVE OPEN - TURN OFF
WITHIN BELOW OPEN - TURN OFF
WITHIN WITHIN - - TURN OFF
* If the economizer damper opens to 100%, the compressor will turn off and the economizer damper will remain
at 100%.