Table 3 Ð Controls Options and Con®gurations
UNIT CONFIGURATION | DEFAULT COOLING | DEFAULT HEATING | |||
CV or VAV Unit with SPT Sensor | Unoccupied Cooling Ð 90 F (SPT) | Unoccupied Heating Ð 55 F (SPT) | |||
Occupied Cooling | Ð NA | Occupied Heating | Ð NA | ||
| |||||
CV Unit with SPT Sensor and Remote | Unoccupied Cooling Ð 90 F (SPT) | Unoccupied Heating Ð 55 F (SPT) | |||
Start/Stop Switch | Occupied Cooling | Ð 78 F (SPT) | Occupied Heating | Ð 68 F (SPT) | |
VAV Unit Remote Start/Stop Switch Only | Unoccupied Cooling Ð 90 F (RAT) | Unoccupied Heating Ð 55 F (RAT) | |||
Occupied Cooling | Ð 55 F (SAT) | Occupied Heating | Ð 68 F (RAT)* | ||
| |||||
VAV Unit with SPT Sensor and Remote | Unoccupied Cooling Ð 90 F (SPT) | Unoccupied Heating Ð 55 F (SPT) | |||
Start/Stop Switch | Occupied Cooling | Ð 55 F (SAT) | Occupied Heating | Ð 68 F (RAT)* |
| LEGEND |
CV | Ð Constant Volume |
NA | Ð Not Available |
RAT Ð | |
SAT Ð | |
SPT Ð Space Temperature | |
VAV | Ð Variable Air Volume |
*With DIP Switch No. 5 con®gured to OPEN (Occupied Heat Enabled).
NOTE: Space temperature sensor and remote start/stop switch are
·control of modulating economizer damper to provide free cooling when outdoor conditions are suitable, using
·control of the economizer damper and indoor fan to obtain unoccupied free cooling
·provide power exhaust output to an external power ex- haust controller
·support a ®eld test for ®eld checkout
·control of 2 stages of CV power exhaust
· | compressor Time Guard (power up, minimum off and on |
| times) |
· | compressor lockout during low |
Additional features are provided by accessing the stand- ard unit control board via software with a computer. These features are:
·electronic expansion board features (if installed)
·control board diagnostics
·ability to change supply air set point (economizer control)
·ability to change high outdoor temperature lockout set point (economizer control)
·ability to change power exhaust set points
NOTE: A CV unit without a thermostat requires a ®eld- supplied sensor for operation.
Features with Sensor Control of Unit
2 sensor options available:
·
·
Standard features are:
·support of remote occupied/unoccupied input to start and stop the unit
·cooling capacity control of 3 stages using economizer and 2 compressors to maintain space temperature to an occu- pied or unoccupied set point
·enable heating or cooling during unoccupied periods as required to maintain space temperature within the unoc- cupied set points
·adjustment of space temperature set points of ±5° F when using a
Additional features with sensor control of unit (with com- puter access) are:
·365 day timeclock with backup (supports minute, hour, day of week, date, month, and year)
·daylight savings time function
·occupancy control with 8 periods for unit operation
·holiday table containing up to 18 holiday schedules
·ability to initiate timed override from
·ability to use multiple space temperature sensors to aver- age the space temperature
·temperature compensated start to calculate early start times before occupancy
·access to the Display, Maintenance, Con®guration, Service, and Set Point data tables through network software
When the unit is equipped with a
NOTE: For units with a
An electronic expansion board may be
·control of modulating economizer damper to maintain in- door air quality (IAQ) when outdoor conditions are suitable
NOTE: The IAQ sensor must be set for current output (4 to 20 mA), not voltage output. Ensure the jumper on the sensor is in the upper position. See Fig. 15.
·provide discrete inputs for fan status, ®lter status, ®eld- applied status, and demand limit
·provide an output for the external alarm light indicator
·provide power exhaust ®re outputs for direct control of modulated power exhaust stages during ®re or smoke modes
·control of smoke control modes including evacuation, smoke purge, pressurization, and ®re shutdown (modulating power exhaust required)
When the unit is connected to the CCN (Carrier Comfort Network), the following expansion board features can be utilized:
·perform Demand Limit functions based on CCN loadshed commands or the state of the discrete input
·alarm monitoring of all key parameters
·CCN protocol
·provides CCN IAQ participation
See Carrier TEMP or VVT (Variable Volume and Tem- perature) literature for complete TEMP (single zone) or VVT
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