Carrier 48LCB07 Controls, Start-Up, Operation And Troubleshooting page 19

With vav-rtu open controller
Table of Contents

Advertisement

Occupied Heating
Once a morning warm-up cycle is complete, Occupied Heating al-
lows the unit to return to heating, if needed. If Disable is selected,
the unit will not return to heating until the next occupancy cycle.
Range = Disable/Enable
Default = Disable
Supply Air Temp Reset
Allows the Supply Air Temperature Setpoint to be reset upward
based on the amount the controlling zone temperature has fallen
below the cooling setpoint.
Range = Disable/Enable
Default = Disable
Reset Ratio
The amount of reset calculated per degree as the controlling zone
temperature falls below the cooling setpoint.
Range = 0 to 10
Default = 3
Reset Maximum Limit
The highest value in degrees of reset allowed when calculating the
Supply Air Temp Reset.
Range = 0 to 25°F
Default = 10°F
SA Reset Humidity Override
Allows a reduction of the calculated Supply Air Temp Reset as the
Space Relative Humidity approaches the Occ Relative Humidity
Setpoint.
Range = Disable/Enable
Default = Disable
Humidity Override
Allows a reduction of the calculated Supply Air Temp Reset as the
Space Relative Humidity approaches the Occ Relative Humidity
Setpoint.
Range = Disable/Enable
Default = Disable
Minimum Cooling SAT
In cooling mode, the cooling outputs are controlled so that the
supply air temperature does not drop below this value. The Mini-
mum Cooling SAT is upper-limited by the calculated Supply Air
Temp Clg. Setpoint minus 5°F.
Range = 45 to 75°F
Default = 45°F
Maximum Heating SAT
In heating mode, the heating outputs are controlled so the supply
air temperature does not rise above this value. The Maximum
Heating SAT is upper-limited by the calculated Automatic Max
SAT Limit Learning algorithm.
Range = 90 to150°F
Default = 120°F
Vent Dmpr Pos / DCV Min Pos
The minimum outdoor air damper position maintained during oc-
cupied periods.
Range = 0 to 100% open
Default = 20% open
Economizer Purge Min Pos
The maximum outdoor air damper position allowed while DCV is
active.
Range = 0 to 100% open
Default = 40% open
Low Fan Econ Min Pos
The minimum outdoor air damper position maintained during oc-
cupied periods when the fan is running at the minimum VFD
speed.
Range = 0 to 100%
Default = 33%
DCV Max Vent Damper Pos
The maximum outdoor air damper position allowed while DCV is
active.
Range = 0 to 75% open
Default = 50% open
Static Pressure Reset Enable
Enables Static Pressure setpoint reset, based on air terminal damp-
er position received via Linkage. When the air terminal maximum
damper is less than Minimum Damper Position, the unit initiates
static pressure reset by lowering the calculated static pressure set-
point.
Range = Disable/Enable
Default = Enable
Maximum Damper Position
The trip point for the maximum air terminal damper position, re-
ceived via Linkage, that calculates a reduction in any previously
calculated static pressure reset value. When any air terminal has a
damper above the Maximum Damper Position, the static pressure
setpoint begins to increase toward the configured Static Pressure
Setpoint.
Range = 0 to 100% Open
Default = 80% Open
Minimum Damper Position
The trip point for the minimum air terminal damper position, re-
ceived via Linkage, that calculates static pressure setpoint reset.
When all air terminals have their damper below the Minimum
Damper Position, the Current Static Pressure Setpoint Reset value
will increase, reducing the static pressure setpoint.
Range = 0 to 100% Open
Default = 50% Open
Maximum Reset
The maximum static pressure reset allowed.
Range = 0.05 to 2.50 in.wg
Default = 0.25 in. wg
SP Reset Demand Level
Enables the System Demand Level specified to lower the static
pressure by the maximum reset value, when active. Enabling is
cumulative for that level and higher levels with Cool Dmd Lvl 3
being the highest load shedding demand level.
Range = Not Active, Cool Dmd Lvl 1, Cool Dmd Lvl 2 Cool,
Dmd Lvl 3
Default = Not Active
Supply Fan Service Alarm Timer
A Supply Fan Runtime alarm is generated when the supply fan
run hours exceed this value. Set to 0 to disable.
Range = 0 to 9999 hr
Default = 600 hr
Compressor 1 Service Alarm Timer
Compressor 1 Runtime alarm is generated when the compressor 1
run hours exceed this value. Set to 0 to disable.
Range = 0 to 9999 hr
Default = 0 hr
19

Advertisement

Table of Contents
loading

This manual is also suitable for:

50lcb0748lcb2650lcb26

Table of Contents