Ccn Global Schedule; Timed Override - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

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CCN Global Schedule — Schedule Numbers, Time Clock
SCH.N from 65 to 99 indicate operation under a CCN Global
Schedule. For unit operation based on a CCN Global Schedule,
the Enable/Off/Remote Control switch must be in the Enable
or Remote Control position with external contacts closed.
In the example in Table 21, the CCN Global Schedule the
unit is to follow is 65. To set up the unit to follow this schedule,

Time Clock SCH.N must be modified.
Any unit can be the Global Schedule Broadcaster. When
using a Global Broadcast Schedule, the schedule broadcaster
must have the Global Schedule Broadcast, Configuration

BCST G.S.BC=ON and all other devices on the network
should have their Global Schedule Broadcast flag set to
 
Configuration BCST G.S.BC=OFF. There can be only
one broadcaster of a specific schedule. The unit set to be the
schedule broadcaster must have a schedule number from 65 to
99, and the Local Schedule configured as described above. It
will broadcast the internal time schedule once every 2 minutes.
Table 21 — CCN Global Schedule Required
Configuration
TIME CLOCK MODE
SUBMODE ITEM DISPLAY
SCH.N XX
Timed Override — There are several ways to override the
occupancy schedule to keep the unit in an occupied period.
Schedule overrides can be initiated at the unit's interface with
either the scrolling marquee or Navigator™ device, from a
space temperature sensor equipped with a timed override but-
ton (see unit Installation Instructions for selection and wiring
information), or through CCN communications. Initiation of
an override period can only be accomplished if the unit is in an
unoccupied period. If Timed Override is in effect, Operating
 
Modes MODE MD06, Timed Override in Effect will be
active. Override expires after each initiation.
Timed Override from Scrolling Marquee/Navigator Device —
A timed override period can be initiated with the unit's inter-
face device. To initiate an override period from the unit's
MONDAY TUESDAY WEDNESDAY
Fig. 15 — Example Schedule
ITEM
COMMENT
DESCRIPTION
Default: 0
Schedule
Range: 0 to 99
Number XX
Example = 65
THURSDAY FRIDAY SATURDAY

interface device, the number of hours requested must be set in

Time Clock OVR
Table 22.
Once a non-zero value has been entered, the unit will re-
sume an occupied period for the duration of the time pro-
grammed. The number of hours in the override time period will
be displayed in OVR.T and will count down as the time period
progresses. This value cannot be changed until the override pe-
riod has expired or is cancelled. The override time period can
be cancelled by changing the OVR.T value to 0. This can be
done at the unit's interface device or through CCN communi-

cations by writing to the point OVR_EXT.
Table 22 — Timed Override Required
SUBMODE ITEM DISPLAY
OVR OVR.T
Timed Override from Space Temperature Sensor with Override
Button — A timed override period can be initiated using a
space temperature sensor with an override button from the
space.
NOTE: This feature requires a single space temperature sensor
connected to the unit. It does not function when used with
averaging space temperature sensor arrays.
To configure this feature, Time Clock
(Override Time Limit) must be set to a non-zero value. This
determines the maximum number of hours the override period
can extend an occupied period when the override button is
pushed. This item has a range of 0 to 4 hours and should be set
to the limit desired for the override period. See Table 23.
Pressing the override button on the Space Temperature Sen-
sor will initiate an override period. The override button must
be pressed for 2 to 4 seconds for the control to acknowledge the
call. The control will ignore a momentary press of the override
button. However, if the override button is held for longer than 4
seconds, a Space Temperature Thermistor Failure alarm will be
generated. The number of hours in the override time period
24
SUNDAY HOLIDAY
LEGEND
— Occupied

OVR.T (Timed Override Hours). See
Configuration
TIME CLOCK MODE
ITEM
DESCRIPTION

Timed Override

Default: 0
X
Hours Range: 0 to 4

OVR
COMMENT

OVR.L