Table 3 - Modes Of Operation - York J Series Manual

TABLE 3 – MODES OF OPERATION
Control
Occupied
Thermostat Controller Occupied input
is ON (energized by 'stat
occ. output, or by an
external command).
'stat uses its
programmed occupied
htg. Setpoint. Supply fan
controlled by 'stat's G
output.
Economizer damper at
programmed min. position.
'stat W1, W2 outputs
control heating stages 1
and 2.
If hydronic heat, 'stat W1,
W2 outputs select
programmed "Hydronic
heat 1 and 2 stage
st nd
Setpoints.
Space Controller Occupied input
Sensor is ON (energized by an
external command).
Space temperature is
controlled to a
programmed occupied
htg. setpoint.
For supply fan, setting of
the parameter "Fan ON
mode with the Sensor
Option" determines if the
supply fan is ON
continuously, or is in
"Auto" mode (i.e. goes off
when space is satisfied).
Economizer damper at
programmed min. position.
Heating is controlled by a
PI algorithm that controls
staging of heat stages
and modulates duty cycle
of the highest numbered
running heating stage.
If hydronic heat, space
control algorithm selects
programmed "Hydronic
Heat 1 Stage SAT
st
Setpoint" and "Hydronic
Heat 2 Stage SAT
nd
Setpoint".
JOHNSON CONTROLS
Heating
Unoccupied
Controller Occupied input
is OFF (deenergized by
'stat occ. output, or by
an external command).
Economizer damper is at
0% Control is same as
occupied heating, except
'stat uses its
programmed unoccupied
heating setpoint.
Controller Occupied input
is OFF (deenergized by
an external command).
Economizer damper is at
0% Supply fan is in
"Auto" mode (i.e. goes off
when space is satisfied).
Control is same as
occupied heating, except
space temperature is
controlled to a
programmed unoccupied
heating setpoint.
Cooling
Occupied
Controller Occupied input is ON
(energized by 'stat occ. output,
or by an external command).
'stat uses its programmed
occupied clg. setpoint. Supply
fan controlled by 'stat's G output
Economizer damper at
programmed min. position, may
modulate open if free cooling is
being used.
Mechanical cooling mode:
'stat Y1, Y2 outputs control
stage 1 and 2 compressors.
Economizer mode:
'stat Y1, Y2 outputs select High
and Low programmed
Economizer SAT setpoints, SAT
controlled by economizer
control algorithm.
Controller Occupied input is ON
(energized by an external
command).
Space temperature is controlled
to a programmed occupied clg.
setpoint.
For supply fan, setting of the
parameter "Fan ON mode with
the Sensor Option" determines
if the supply fan is ON
continuously, or is in "Auto"
mode (i.e. goes off when space
is satisfied).
Economizer damper at
programmed min. position, may
modulate open if free cooling is
being used.
Mechanical cooling mode:
Cooling is controlled by a PI
algorithm that controls
compressor staging and
modulates duty cycle of the
highest numbered running
compressor.
Economizer mode:
Space control algorithm selects
High and Low programmed
Economizer SAT setpoints, SAT
controlled by economizer
control algorithm.
FORM 100.50-NOM7 (808)
Unoccupied
Controller Occupied input is
OFF (deenergized by 'stat
occ. output, or by an external
command).
Economizer damper is at 0%
(damper may modulate open
if free cooling is being used).
Control is same as occupied
cooling, except 'stat uses
its programmed unoccupied
cooling setpoint.
Controller Occupied input
is OFF (deenergized by an
external command).
Economizer damper is at 0%
(damper may modulate open
if free cooling is being used).
Supply fan is in "Auto" mode
(i.e. goes off when space is
satisfied).
Control is same as occupied
cooling with a space sensor,
except space temperature is
controlled to a programmed
unoccupied clg. setpoint.
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