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ACCESSORY USAGE GUIDELINE
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
† Only when low-pressure switch is used.
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 mesh screen inserted under the top cover and inside the base pan to protect the condenser coil from corrosive atmosphere without restricting airflow.
SUGGESTED USE: In geographic areas where salt damage could occur.
In areas with high pollution levels.
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 motor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
Replacement installations with rapid pressure balance (RPB) expansion valve on indoor coil.
5. Crankcase Heater
An electric resistance heater which mounts to the base of the compressor to keep the 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 Winter Start Control has been added. Use with Low-Ambient Controller.
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 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 Residential Split System Long-Line Application Guideline.
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(Below 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 50 Ft)
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within 2 Miles)
Crankcase Heater Yes Yes No
Evaporator Freeze Thermostat Yes No No
Winter Start Control
Ye s
†
No No
Accumulator No No No
Compressor Start Assist
Capacitor and Relay
Yes Yes No
Low-Ambient Controller
or
MotorMaster® Control
Ye s N o N o
Wind Baffle See Low-Ambient Instructions No No
Coastal Filter No No Yes
Support Feet Recommended No Recommended
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
No
Ball Bearing Fan Motor Yes No No