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ACCESSORY DESCRIPTION AND USAGE (Listed Alphabetically)
1. Ball Bearing Fan Motor
A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.
SUGGESTED USE: Required on all units where Low-Ambient Controller (full modulation feature) or MotorMaster
®
Control has been added.
2. Coastal Filter
A filter designed to protect the condenser coil from salt damage without restricting airflow through the outdoor coil.
SUGGESTED USE: Geographic areas prone to salt spray. Used to meet job specifications where added coil protection is required.
3. Compressor Start Assist—Capacitor/Relay Type
Start capacitor and start relay gives ‘‘hard’’ boost to compressor motor at each start-up.
SUGGESTED USE: Installations where interconnecting tube length exceeds 50 ft.
Installations where outdoor design temperature exceeds 105°F (40.6°C).
Replacement installations with hard shutoff expansion valve on indoor coil.
Installations where Liquid-Line Solenoid Valve has been added.
4. Compressor Start Assist—PTC Type
Solid-state electrical device which gives a ‘‘soft’’ boost to compressor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
5. Crankcase Heater
An electric resistance heater which mounts to the base of compressor to keep lubricant warm during off cycles. Improves compressor lubrication on
restart and minimizes chance of refrigerant slugging. May or may not include a thermostat control.
SUGGESTED USE: When interconnecting tube length exceeds 50 ft.
When unit will be operated below 55°F (12.8°C) outdoor air temperature. Use with Low-Ambient Controller.
All commercial installations.
6. Cycle Protector
Solid-state timing device which prevents compressor rapid recycling. Control provides an approximate 5-minute delay after power to the compressor has
been interrupted 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.
High rise applications.
7. Evaporator Freeze Thermostat
An SPST temperature actuated switch which stops unit operation when evaporator reaches freeze-up conditions.
SUGGESTED USE: All units where Low-Ambient Controller has been added.
8. Filter Drier
A device for removing contaminants from refrigerant circulating in an air conditioner: 1-direction flow.
SUGGESTED USE: All split-system air conditioners.
9. High-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on high side of refrigerant circuit. Cycles compressor off if refrigerant pressure rises to 400 ± 10
psig and resets at 298 ± 20 psig. Provides additional protection against compressor damage due to loss of outdoor airflow. To prevent rapid compressor
recycling, Cycle Protector can be used with this switch.
SUGGESTED USE: Installations exposed to very ‘‘dirty’’ outdoor air.
Installations where condenser inlet air temperature exceeds 125°F (51.7°C).
10. 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
liquid flow in response to compressor operation. Maintains a column of refrigerant liquid ready for action at next compressor operation cycle.
Note: Compressor Start Assist—Capacitor/Relay Type must also be used. Do not use with hard shutoff TXV.
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 Long-Line Application Guideline.
11. Low-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on low side of refrigerant circuit. Cycles compressor off if refrigerant pressure drops to about 27
psig. Prevents indoor coil freeze-up due to loss of indoor airflow. Also, provides additional protection against compressor damage due to loss of refrigerant
charge. To prevent rapid compressor recycling. Compressor Cycle Protector can be used with this switch.
SUGGESTED USE: Where indoor coil is exposed to ‘‘dirty’’ air.
All commercial installations.
12. MotorMaster
®
Control
A fan speed control device activated by a temperature sensor. Designed to control condenser fan motor speed in response to the saturated, condensing
temperature during operation in cooling mode only. For outdoor temperatures down to –20°F, it maintains condensing temperature at 100°F ±10°F.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F.
All commercial installations.
13. Outdoor Air Temperature Sensor
A device that allows the temperature at a remote location (outdoors) to be displayed at the thermostat.
SUGGESTED USE: All corporate programmable thermostats.
14. Sound Hood
Wrap-around sound attenuation cover for the compressor. Reduces the sound level by about 2 decibels.
SUGGESTED USE: Unit installed closer than 15 ft to quiet areas—bedrooms, etc.
Unit installed between 2 houses less than 10 ft apart.
15. Support Feet
Four stick-on plastic feet which raise the unit 4 in. above the mounting pad. This allows sand, dirt, and other debris to be flushed from the unit base;
minimizes corrosion.
SUGGESTED USE: Coastal installations.
Windy areas or where debris is normally circulating.
Rooftop installations.
16. Thermostatic Expansion Valve (TXV) Kits
A modulating flow control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving the
evaporator. Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB type valves are available. Do not use hard shutoff
TXV with 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.