Carrier 38TUA Product Data

Also see for 38TUA: Product data Installation and start-up instructions

Contents

6Accessory description and usage (Listed alphabetically)1. Coastal FilterA mesh screen inserted under the top cover and inside the base pan to protect the condenser coil from salt damage without restricting airflow.SUGGESTED USE: In geographic areas where salt damage could occur.2. Compressor Start Assist — Capacitor and RelayStart capacitor and start relay which give a ‘‘hard” boost to compressor motor at each start-up.SUGGESTED USE: Installations where interconnecting tube length exceeds 50 ft (15.24m).Installations where outdoor design temperature exceeds 105°F (40.6°C).Installations where Liquid-Line Solenoid Valve has been added.3. Compressor Start Assist — PTCSolid-state electrical device which gives a ‘‘soft’’ boost to compressor motor at each start-up.SUGGESTED USE: Installations with marginal power supply.Replacement installations with rapid pressure balance (RPB) expansion valve on indoor coil.4. Cycle ProtectorSolid-state timing device which prevents compressor rapid recycling. Control provides an approximate 5-minute delay after power to the compressor has beeninterrupted for any reason, including normal room thermostat cycling.SUGGESTED USE: Installations in areas where power interruptions are frequent.Where user is likely to “play” with the room thermostat.All commercial installations.Installations where interconnecting tube length exceeds 50 ft. (15.24m).High-rise applications.5. Evaporator Freeze ThermostatAn SPST temperature actuated switch which stops unit operation when evaporator reaches freeze-up conditions.SUGGESTED USE: All units where Winter Start Control has been added. Use with Low-Ambient Controller.6. Filter DrierA device for removing contaminants from refrigerant circulating in an air conditioner: 1 direction flow.SUGGESTED USE: All field-connected split-system air conditioners.7. Liquid-Line Solenoid Valve (LSV)An electrically operated shutoff valve to be installed at the outdoor or indoor unit (depending on tubing configuration) which stops and starts refrigerant liquidflow in response to compressor operation. Maintains a column of refrigerant liquid ready for action at next compressor operation cycle.SUGGESTED USE: For improved system performance in air conditioners for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.In certain long-line applications. Refer to the Residential Split-System Long-Line Application Guideline.8. Low-Ambient Pressure SwitchA long life pressure switch which is mounted to outdoor unit service valve. It is designed to cycle the outdoor fan motor in order to maintain head pressurewithin normal operating limits (approximately 100 psig to 225 psig). The control will maintain working head pressure at low-ambient temperatures down to0°F (–17.8°C) when properly installed.SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).9. MotorMaster® ControlA fan speed control device activated by a temperature sensor. Designed to control condenser fan motor speed in response to the saturated, condensingtemperature during operation in cooling mode only. For outdoor temperatures down to –20°F (–28.9°C), it maintains condensing temperature at 100°F ± 10°F(37.8°C ± 5.5°C).SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).All commercial installations.10. Outdoor Air Temperature SensorA device that allows the temperature at a remote location (outdoors) to be displayed at the thermostat.SUGGESTED USE: All Carrier programmable thermostats.11. Support FeetFour stick-on plastic feet which raise the unit 4 in. (102mm) above the mounting pad. This allows sand, dirt, and other debris to be flushed from the unit base,minimizing corrosion.SUGGESTED USE: Coastal installations.Windy areas or where debris is normally circulating.Rooftop installations.12. Thermostatic Expansion Valve (TXV)A modulating flow control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving theevaporator. Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB type valves are available. Do not use hard shutoff TXVwith Liquid-Line Solenoid Valve.SUGGESTED USE: For improved system performance in cooling mode for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.Required for use on all zoning systems.13. Time-Delay RelayAn SPST delay relay which briefly continues operation of the indoor blower motor to provide additional cooling after the compressor cycles off.SUGGESTED USE: For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.Required for use on all zoning systems.14. Winter Start ControlAn SPST delay relay which bypasses the low-pressure switch for approximately 3 minutes to permit start-up for cooling operation under low-load conditions.SUGGESTED USE: All air conditioners which have low-pressure switch and where Low-Ambient Controller has been added.