York YPAL 061, YPAL 050, YPAL 051, YPAL 060 manual Sequence of Operation, Morning Warm-Up

Sequence of Operation

•If heating mode is selected the Simplicity Elite control will also compare the current outdoor temperature to the outdoor temperature recorded during the previous start up period.

–If the current outdoor air temperature is 10.0° F or more below the previous day the Simplic- ity Elite control will add 5inutes to the above calculated recovery time for every 10.0° F difference.

•The outdoor damper will be kept closed during this period unless it is being used to meet the oc- cupied cooling space temperature requirement.

•Even if the space temperature satisfies the “CV OCCUPIED COOLING” and “CV OCCUPIED HEATING” set points the unit will not switch to the occupied mode until the calculated warm up / cool down time has expired. However, the supply fan will remain energized during this time. If the space temperature rises above the “CV OCCUPIED COOLING”, or below the “CV OCCUPIED HEATING” set points during this time the cooling or heating will cycle back on.

MORNING WARM-UP

This feature can be used to energize the heating section of the unit to bring the temperature of the space up to conditions prior to the start of the occupied period.

The following parameters must be programmed in order to use this feature:

“MORNING WARM-UP ENABLE” – must be enabled using Parameter 28 under the PROGRAM key of the Simplicity Elite control board or under the HEATING SETUP tab of the Simplicity PC software package.

“MORNING WARM-UP/VAV RETURN AIR TEMP SETPOINT” - must be programmed using Parameter 29 under the PROGRAM key of the Simplicity Elite control board or under the HEATING SETUP tab of the Simplicity PC software package.

“HEATING MODE ENABLED FOR OPERATION”

–must be enabled using Parameter 54 under the PROGRAM key of the Simplicity Elite control board or under the HEATING SETUP tab of the Simplicity PC software package.

FORM 100.50-NOM6 (1207)

The following criteria must be met for Morning Warm- up operation:

•Morning Warm-up will only work on a VAV system.

•Morning Warm-up will only work when the in- ternal scheduling feature is used. It will not work using a hard wired or communicated Occupied command.

•Morning Warm-up will only function during the first occupied period of each day.

Sequence of Operation

•One hour before the beginning of the occupied period the Simplicity Elite control will energize the supply fan circuit.

•The Simplicity Elite control will keep the econo- mizer damper closed.

•After 5 minutes of supply fan operation the Sim- plicity Elite control will compare the return air temperature to the “MORNING WARM-UP/VAV RETURN AIR TEMP SETPOINT”.

•If the return air temperature is 2.0° F or more below the “MORNING WARM-UP/VAVRETURN AIR TEMP SETPOINT” the Simplicity Elite control will energize all the available heat.

•If the return air temperature is not 2.0° F or more below the “MORNING WARM-UP/VAV RETURN AIR TEMP SETPOINT” the Simplicity Elite control will continue supply fan operation while continuing to monitor the return air tem- perature.

•When the return air temperature is equal to or above the “MORNING WARM-UP/VAV RE- TURN AIR TEMP SETPOINT” heating operation will be de-energized.

•During this time the heat will cycle on and off based on the comparison of the return air tem- perature to the “MORNING WARM-UP/VAV RETURN AIR TEMP SETPOINT”.

•After one hour of operation the Simplicity Elite control will go into the Occupied mode and open the economize to the minimum position.

•Heating operation will continue until the return air temperature is equal to or above the “MORN-

ING WARM-UP/VAV RETURN AIR TEMP SETPOINT”.

88 JOHNSON CONTROLS