York YPAL 050 manual The unit can not be in an active heating or cooling mode, Comfort Ventilation

FORM 100.50-NOM6 (1207)

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 satisfied.

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
							5
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%.

JOHNSON CONTROLS 81