Cooling - Unoccupied Stand Alone; Heating - Occupied Stand Alone; Heating - Unoccupied Stand Alone; Condenser Fan Operation - York ECO2 YPAL 050 Installation & Operation Manual

Sequence of Operation

Cooling – Unoccupied Stand Alone
The Simplicity Control cannot operate unoccupied
cooling with this method of control.
Heating – Occupied Stand Alone
The following parameters must be programmed into
the Simplicity Control:
• "VAV OCCUPIED HEATING ENABLED"
– This must be turned on using Parameter 26
under the PROGRAM key on the Simplicity
control board or under the HEATING SETUP
tab in the Simplicity PC software package.
• "MORNING WARM-UP/ VAV RETURN AIR
TEMP SETPOINT" – using Parameter 29 under
the PROGRAM key on the Simplicity control
board or under the HEATING SETUP tab in the
Simplicity PC software package.
• "VAV OCCUPIED HEATING SETPOINT" – us-
ing Parameter 27 under the PROGRAM key on
the Simplicity control board or under the HEAT-
ING SETUP tab in the Simplicity PC software
package.
• "SPACE SENSOR FAULT OVERRIDE EN-
ABLED" must be turned on – using Parameter
8 under the PROGRAM key on the Simplicity
control board or under the SYSTEMS OPTIONS
tab in the Simplicity PC software package.
The unit will initiate Occupied Heating when the
following criteria are met:
• The return air temperature is 2.0° F less than the
"VAV OCCUPIED HEATING SETPOINT".
• The return air temperature is 0.1° F below the
"MORNING WARM UP / VAV RETURN AIR
TEMP SETPOINT".
The "VAV OCCUPIED HEATING SETPOINT" should
always be set below the "MORNING WARM UP RAT
SETPOINT".
The unit will terminate Occupied Heating when:
• The return air temperature is equal to the
"MORNING WARM UP RAT SETPOINT".
72
Heating – Unoccupied Stand Alone
The Simplicity Control cannot operate unoccupied
heating with this method of control.

CONDENSER FAN OPERATION

A call for the operation of compressor 1A or 1B will
close an output at terminal CF1 of the P13 connector.
This 24 VAC output energizes the 6M contactor and
turns on condenser fan 1. This 24 VAC output is also
sent to pressure switch PS3. If the discharge pressure
rises above 360 psig the PS3 switch closes and energizes
the 7M contactor. The 7M contactor then energizes
condenser fan 2. If the discharge pressure decreases
below 300 psig the PS3 switch opens and de-energizes
condenser fan 2.
A call for the operation of compressor 2A or 2B will
close an output at terminal CF2 of the P13 connector.
This 24 VAC output energizes the 8M contactor and
turns on condenser fan 3. This 24 VAC output is also
sent to pressure switch PS4. If the discharge pressure
rises above 360 psig the PS4 switch closes and energizes
the 9M contactor. The 9M contactor then energizes
condenser fan 4. If the discharge pressure decreases
below 300 psig the PS4 switch opens and de-energizes
condenser fan 4.

COOLING COMPRESSOR LOCKOUT

This feature prevents operation of mechanical cooling
when the outdoor temperature is below this set point.
•
"OUTDOOR AIR TEMP COOLING LOCKOUT"
- this parameter can be set using the COOLING
SETUP tab in the Simplicity PC software pack-
age. This parameter should never be programmed
less then 45.0º F
Sequence of Operation
•
If the outdoor temperature is 1.0º F below the
"OUTDOOR AIR TEMP COOLING LOCK-
OUT" the Simplicity Elite control will prevent
compressor operation.
•
When the outdoor temperature is 1.0º F above
the "OUTDOOR AIR TEMP COOLING LOCK-
OUT" compressor operation will be permitted.
FORM 100.50-NOM6 (1207)
JOHNSON CONTROLS