Honeywell W7750A Manual De Usuario
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
57
74-2958—1
DestBypass -
Has possible states: Bypass On,
Bypass Off or Not Assigned (not active).
This input places the controller in an
untimed bypass state or turns off the
bypass mode. This source is second in
priority to DestManOcc under the same
arbitration schemes mentioned above.
Bypass Off or Not Assigned (not active).
This input places the controller in an
untimed bypass state or turns off the
bypass mode. This source is second in
priority to DestManOcc under the same
arbitration schemes mentioned above.
Override Button -The wall module Override pushbutton
can command status of Bypass,
Continuous Unoccupied and Not
Assigned. This source has the lowest
priority status in the above mentioned
schemes. The above mention sources
of override must be either Not Assigned
or Off before the Override pushbutton
affects the manual override status in the
Network Wins scheme. All actions, in
this case, taken from the Override
pushbutton are locked out.
Continuous Unoccupied and Not
Assigned. This source has the lowest
priority status in the above mentioned
schemes. The above mention sources
of override must be either Not Assigned
or Off before the Override pushbutton
affects the manual override status in the
Network Wins scheme. All actions, in
this case, taken from the Override
pushbutton are locked out.
Bypass status is a controller-timed
event whose duration is set in BypTime.
Upon expiration of the timer, the status
returns to Not Assigned. The status of
this input can be overridden with the
receipt of Not Assigned from
DestManOcc. This, in effect, cancels a
timed bypass or a continuous
unoccupied mode.
event whose duration is set in BypTime.
Upon expiration of the timer, the status
returns to Not Assigned. The status of
this input can be overridden with the
receipt of Not Assigned from
DestManOcc. This, in effect, cancels a
timed bypass or a continuous
unoccupied mode.
The Override pushbutton can be
configured as Normal (all of the above
mentioned states are possible), Bypass
Only (Bypass and Not Assigned only) or
None (effectively Disabling the Override
pushbutton).
configured as Normal (all of the above
mentioned states are possible), Bypass
Only (Bypass and Not Assigned only) or
None (effectively Disabling the Override
pushbutton).
TIME CLOCK (Occ_Time_Clock)
OccTimeClock is the state of the digital input configured and
wired to a time clock. When the digital input is detected to be
Closed (Occupied), the scheduled occupancy will be
OC_OCCUPIED. If the detected state of the digital input is
Open (Unoccupied), then the scheduled occupancy will be
OC_UNOCCUPIED. If the Occ_Time_Clock is not configured,
then either the DestSchedOcc network input received from a
central control or the time clock that is broadcast from a
Sched_Master configured W7750, controls the occupied
mode.
wired to a time clock. When the digital input is detected to be
Closed (Occupied), the scheduled occupancy will be
OC_OCCUPIED. If the detected state of the digital input is
Open (Unoccupied), then the scheduled occupancy will be
OC_UNOCCUPIED. If the Occ_Time_Clock is not configured,
then either the DestSchedOcc network input received from a
central control or the time clock that is broadcast from a
Sched_Master configured W7750, controls the occupied
mode.
SCHEDULE MASTER (Sched_Master)
Sched_Master is the state of a digital input that is configured
and wired to the W7750. If the Sched_Master input is closed
(input shorted), the node is the schedule master and the state
of the locally connected time clock will be broadcast out over
the L
and wired to the W7750. If the Sched_Master input is closed
(input shorted), the node is the schedule master and the state
of the locally connected time clock will be broadcast out over
the L
ON
W
ORKS
Bus to the other W7750 controllers. If the
Sched_Master input is open, then the node is not a schedule
master and the local time clock will not be sent out over the
L
master and the local time clock will not be sent out over the
L
ON
W
ORKS
Bus even if the time clock input is configured.
However, the DestSchedOcc network input received from a
central control has a higher priority than the local time clock,
and therefore overrides the local time clock. The W7750
controllers automatically bind without the need for a
configuration tool.
central control has a higher priority than the local time clock,
and therefore overrides the local time clock. The W7750
controllers automatically bind without the need for a
configuration tool.
SETPOINT RAMPING
The W7750 Controller incorporates a ramping feature that
gradually changes the space setpoints between occupancy
modes. This feature is only operational if the network variable
inputs DestSchedOcc, TodEventNext, and Time Until Next
Change Of State (TUNCOS) are being used to change the
W7750 Occupancy mode. The applicable Setpoints are
OaTempMinHtRamp, OaTempMaxHtRamp, MinHtRamp and
MaxHtRamp (for HEAT mode operation), and
OaTempMinClRamp, OaTempMaxClRamp, MinClRamp and
MaxClRamp (for the COOL mode operation). See Fig. 46 for a
pictorial representation of how these setpoints interact.
gradually changes the space setpoints between occupancy
modes. This feature is only operational if the network variable
inputs DestSchedOcc, TodEventNext, and Time Until Next
Change Of State (TUNCOS) are being used to change the
W7750 Occupancy mode. The applicable Setpoints are
OaTempMinHtRamp, OaTempMaxHtRamp, MinHtRamp and
MaxHtRamp (for HEAT mode operation), and
OaTempMinClRamp, OaTempMaxClRamp, MinClRamp and
MaxClRamp (for the COOL mode operation). See Fig. 46 for a
pictorial representation of how these setpoints interact.
During recovery operation, the setpoint changes at a rate in
degrees per hour depending on the outdoor air temperature. If
there is no outdoor air temperature sensor available, then
MinHtRamp is used as the recovery rate.
degrees per hour depending on the outdoor air temperature. If
there is no outdoor air temperature sensor available, then
MinHtRamp is used as the recovery rate.
Fig. 46. Setpoint ramping parameters with ramp rate
calculation.
NOTE:
Recovery ramping applies between scheduled
heating or cooling setpoint changes from
UNOCCUPIED to STANDBY, UNOCCUPIED to
OCCUPIED, and STANDBY to OCCUPIED.
Scheduled setpoint changes from OCCUPIED to
UNOCCUPIED or OCCUPIED to STANDBY do not
use a ramped setpoint but instead use a step change
in setpoint. Recovery ramps begin before the next
scheduled occupancy time and are ramped from the
setpoint for the existing scheduled occupancy state
to the setpoint for the next occupancy state.
heating or cooling setpoint changes from
UNOCCUPIED to STANDBY, UNOCCUPIED to
OCCUPIED, and STANDBY to OCCUPIED.
Scheduled setpoint changes from OCCUPIED to
UNOCCUPIED or OCCUPIED to STANDBY do not
use a ramped setpoint but instead use a step change
in setpoint. Recovery ramps begin before the next
scheduled occupancy time and are ramped from the
setpoint for the existing scheduled occupancy state
to the setpoint for the next occupancy state.
RECOVERY RAMPING FOR HEAT PUMP SYSTEMS
When the node is controlling heat pump equipment, during the
recovery ramps, the heating setpoint is split into a heat pump
setpoint (for compressors) and an auxiliary heat setpoint (for
auxiliary heat stages). The heat pump setpoint is a step
change at the recovery time prior to the OCCUPIED time.
Recovery time is computed from the configured heat recovery
ramp rate. The recovery time is calculated:
Recovery time = (OCC setpoint - current setpoint)/ramp rate
recovery ramps, the heating setpoint is split into a heat pump
setpoint (for compressors) and an auxiliary heat setpoint (for
auxiliary heat stages). The heat pump setpoint is a step
change at the recovery time prior to the OCCUPIED time.
Recovery time is computed from the configured heat recovery
ramp rate. The recovery time is calculated:
Recovery time = (OCC setpoint - current setpoint)/ramp rate
See Fig. 47 for the various setpoints.
HEAT RECOVERY
RAMP RATE
(DEGREES/HOUR)
RAMP RATE
(DEGREES/HOUR)
MaxHtRam
MinHtRam
OaTempMinHtRa
OaTempMaxHtRam
OUTDOOR AIR
TEMPERATURE
TEMPERATURE
M10109