York ECO2 YPAL 050 - Manual (Page 88)

88 JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
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 satisfi es 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.
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
fi rst 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/VAV RETURN
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”.