York YPAL 051 User Manual
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.
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”:
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.
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.
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.
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.
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%.
at 100%.