Bryant 548J 04-24 581J 04-28, Controls, Start-Up, Operation And Troubleshooting, Page: 15 / 44

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DCV Max Vent Damper Pos – This is the greatest
position the economizer can open to while trying to
control the indoor air quality levels
Range = 0- 75% open Default = 50% open
S Fan Service Alarm Timer – The timer set for the Supply
Fan Runtime Alarm. After the number of hours set on this
point is exceeded the corresponding alarm will be generated,
and must be manually cleared in the maintenance menu after
the maintenance has been completed. The timer will then
begin counting its runtime again for the next due
maintenance.
Range = 0 to 9999 hr Default = 600 hr
NOTE : If set to 0 hr this setpoint is disabled and its alarm
will never be generated.
Comp 1 Service Alarm Timer – The timer set for the
Compressor 1 Runtime Alarm. After the number of hours
set on this point is exceeded the corresponding alarm will
be generated, and must be manually cleared in the
maintenance menu after the maintenance has been
completed. The timer will then begin counting its runtime
again for the next due maintenance.
Range = 0 to 9999 hr Default = 0 hr
NOTE : Default = 0 hours, if set = 0 hr this point is
disabled and its alarm will never be generated.
Comp 2 Service Alarm Timer
– The timer set for the
Compressor 2 Runtime Alarm. After the number of hours
set on this point is exceeded the corresponding alarm will
be generated, and must be manually cleared in the
maintenance menu after the maintenance has been
completed. The timer will then begin counting its runtime
again for the next due maintenance.
Range = 0 to 9999 hr Default = 0 hr
NOTE : Default = 0 hours, if set = 0 hr this point is
disabled and its alarm will never be generated.
Filter Service Alarm Timer
– The timer set for the Dirty
Filter Alarm. After the number of hours set on this point is
exceeded the corresponding alarm will be generated, and
must be manually cleared in the maintenance menu after
the maintenance has been completed. The timer will then
begin counting its runtime again for the next due
maintenance.
Range = 0 to 9999 hr Default = 600 hr
NOTE : Default = 600 hours, if set = 0 hr this point is
disabled and its alarm will never be generated.
Pushbutton Override – Set to enable or disable the push-
button override function of the locally installed space sensor.
Range = Disable/Enable Default = Enable
Setpoint Adjustment – Set to enable or disable the
setpoint adjustment function of the locally installed space
sensor.
Range = Disable/Enable Default = Enable
Setpoint Adjustment Range - Sets the slider range of a
space sensor (with built in function). The slider is used to
offset the control setpoint.
Range = 0 to 5
_
F Default = 5
_
F
Cooling Lockout Temperature
- This defines the
minimum outdoor air temperature that cooling mode can
be enabled and run. If the OAT falls below this number
during cooling the compressors will be de-energized.
Range = 0-80
_
F Default = 45
_
F
Economizer High OAT Lockout Temp – If the outdoor
air temperature rises above this value, economizer cooling
will be disabled and dampers will return and stay at
minimum position.
Range = 55-80
_
F Default = 75
_
F
HP Rev Cycle Lockout Temp – If the outdoor air
temperature falls below this value, the compressors will
not be allowed to run for heating. Unit Type must be set to
Heat pump for this to be active.
Range = -20-30
_
F Default = -3
_
F
Heating Lockout Temperature – This defines the
maximum outdoor air temperature that heating mode can
be enabled and run. If the OAT rises above this number
during heating the heat stages will be de-energized.
Range = n/a Default = 65
_
F
Pre- Occupancy Purge - Enables or disables the use of a
purge cycle immediately prior to the start of a scheduled
occupied period.
Range = Enable/Disable Default = Disable
Purge Time - The maximum amount of time used for a
pre- occupancy purge.
Range = 0 to 240 minutes Default = 60 minutes
Unocc Free Cool Enable – Set to enable or disable the
economizer for night time free cooling (NTFC) operation.
Range = Disable/Enable Default = Disable
Setpoint Separation – Sets the minimum separation gap
in which setpoints can be set.
Range = 2-10
_
F Default = 5
_
F
Occupancy Source – Tells the controller which method of
occupancy control to use in determining occupancy of the
rooftop. Refer to Occupancy in the operation section for
detail on each specific operation function.
Range = Always Occupied, BACnet Schedule,
BAS On/Off, or Remote Occ Input
Default =Always occupied
Inputs
Input 1 Function
– This input is an analog input and can
be configured to be one of four different inputs: No
Sensor, IAQ Sensor, OAQ Sensor, or Space RH Sensor.
Input 1 is wired to pin J4- 4,5,6.
Default = No Sensor
Input 2 Function
– This input is an analog input and can
be configured to be one of four different inputs: No
Sensor, IAQ Sensor, OAQ Sensor, or Space RH Sensor.
Input 2 is wired to pin J4- 1,2,3.
Software Default = No Sensor
Factory Default = IAQ Sensor with factory installed CO
2
sensor
NOTE : For Inputs 1 & 2, if using Bryant air quality
sensors do not use 24Vdc from RTU Open board. External
24Vdc power supply required.
Input 3 - This input is a discrete input and can be
configured to be one of six different functions: No
Function, Compressor Safety, Fan Status, Filter Status,
Remote Occupancy, or Door Contact. This input can also
be configured to be either a Normally Open (N/O) or a
Normally Closed (N/C) switch. Input 3 is factory wired to
pin J1-2. Field accessories can be wired to its parallel pin
J5-5.
Factory Default = Compressor Safety and N/O
TS
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5580
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