Accessory Usage Guideline

	REQUIRED FOR	REQUIRED FOR	REQUIRED FOR
	LOW-AMBIENT	LONG-LINE	SEA COAST
	APPLICATIONS	APPLICATIONS*	APPLICATIONS
ACCESSORY	(Below 55°F)	(Over 50 Ft)	(Within 2 Miles)

Crankcase Heater	Yes	Yes	No

Evaporator Freeze Thermostat	Yes	No	No

Winter Start Control	Yes†	No	No

Accumulator	No	No	No

Compressor Start Assist	Yes	Yes	No
Capacitor and Relay	Yes	Yes	No
Capacitor and Relay

Low-Ambient Controller
or	Yes	No	No
MotorMaster® Control

Wind Bafﬂe	See Low-Ambient Instructions	No	No

Coastal Filter	No	No	Yes

Support Feet	Recommended	No	Recommended

Liquid-Line Solenoid Valve		See Long-Line
or	No	Application	No
Hard Shutoff TXV		Guideline

Ball Bearing Fan Motor	Yes	No	No

*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.

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