FORM 100.50-EG3 (802)
59
YORK INTERNATIONAL
Stage 1 (“Y1”) Call
If Y1 is called and the unit is equipped with an economizer,
the control will check to see if the Outside Air is suitable for
economizing. If conditions are suitable for economizing, the
control will control the economizer and stage up compres-
sors, as required, to maintain the economizer first-stage
setpoint. If conditions are not suitable for economizing or
not equipped with an economizer, the control will stage up
50% of the compressors. This shall be maintained until
Stage 1 is deactivated or Stage 2 is called.
Stage 2 (“Y2”) Call
If Y2 is called and the unit is equipped with an econo-
mizer, the control will check to see if the Outside Air is
suitable for economizing. If conditions are suitable for
economizing, the control will control the economizer and
stage up compressors, as required, to maintain the econo-
mizer second-stage setpoint. If conditions are not suit-
able for economizing or not equipped with an economizer,
the control will stage up 100% of the compressors. This
shall be maintained until Stage 2 is deactivated.
Zone Sensor Control
If a zone sensor controls the unit, the OptiLogic
™
con-
troller shall maintain the zone temperature setpoint.
This setpoint is user selectable at the OptiLogic
™
User
Interface.
When a zone sensor is used for control, the OptiLogic
™
unit controller will monitor the temperature within the
space and control the unit accordingly. A closed-loop
staging algorithm is used to stage compressors up and
down as required to maintain the desired zone tem-
perature setpoint. If the unit is equipped with an econo-
mizer, Outside Air conditions are continuously monitored
by the control to determine if conditions are suitable for
economizing. If conditions are suitable for economiz-
ing, the OptiLogic
™
controller will modulate the Outside
Air damper in addition to staging compressors up and
down to maintain the zone temperature setpoint.
HEATING OPERATION
Thermostat Control
If a 7-wire thermostat (2 Cool/2 Heat) controls the unit,
all zone temperature setpoint control is maintained at
the thermostat. With this operation, the unit remains
idle until it receives a stage call from the thermostat. If
“G” is called from the thermostat, the Supply Fan will
start. Ventilation functions (if equipped) will be permit-
ted to run with an occupied signal.
Stage 1 (“W1”) Call
If W1 is called and the unit is equipped with an econo-
mizer, the economizer will go to minimum position with
an occupied signal or close with an unoccupied signal.
and the control will stage up 50% of the heating steps.
This shall remain active until Stage 1 call is deactivated
or a Stage 2 call is activated.
Stage 2 (“W2”) Call
If W2 is called and the unit is equipped with an econo-
mizer, the economizer will go to minimum position with
an occupied signal or close with an unoccupied signal,
and the control will stage up 100% of the heating steps.
This shall remain active until Stage 2 call is deactivated.
Zone Sensor Control
If a zone sensor controls the unit, the OptiLogic
™
con-
troller shall maintain all zone temperature setpoints.
These setpoints are user selectable at the OptiLogic
™
User Interface.
When a zone sensor is used for control, the OptiLogic
™
unit controller will monitor the temperature within the
space and control the unit accordingly. A closed-loop
staging algorithm is used to stage heating steps up and
down as required to maintain the desired zone tem-
perature setpoint. If the unit is equipped with an econo-
mizer, Outside Air conditions are continuously monitored
by the control to determine if conditions are suitable for
economizing. If conditions are suitable for economiz-
ing, the OptiLogic
™
controller will modulate the Outside
Air damper in addition to staging heating steps up and
down to maintain the zone temperature setpoint.
