Accessory Usage Guideline

	REQUIRED FOR LOW---AMBI-	REQUIRED FOR LONG	REQUIRED FOR SEA
Accessory	ENT APPLICATIONS	LINE APPLICATIONS*	COAST APPLICATIONS
	(Below 55° F)	(Over 80 Ft.)	(Within 2 miles)
Crankcase Heater	Yes	Yes	No
Evaporator Freeze Thermostat	Yes	No	No
Accumulator	No	No	No
Compressor Start Assist Capacitor and	Yes	Yes	No
Relay	Yes	Yes	No
Relay
Motor Master→ Control	Yes	No	No
or Low---ambient Pressure Switch	Yes	No	No
or Low---ambient Pressure Switch
Support Feet	Recommended	No	Recommended
Liquid Line Solenoid Valve	No	See Long--- Line Application	No
Liquid Line Solenoid Valve	No	Guideline	No
		Guideline
Ball Bearing Fan Motor	Yes{	No	No

*For tubing line sets between 80 and 200 ft. and/or 20 ft. vertical differntial, refer to Residential Split---System Longline Application Guideline. { Required for Low---Ambient Controller (full modulation feature) and MotorMasterr Control only.

Accessory Description and Usage (Listed Alphabetically)

1. Ball-Bearing Fan Motor

6. Evaporator Freeze Thermostat

A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.

Usage Guideline:

Required on all units when MotorMasterr is used.

2. Compressor Start Assist - Capacitor and Relay

Start capacitor and relay gives a ”hard” boost to compressor motor at each start up.

Usage Guideline:

Required for reciprocating compressors in the following applications:

Long line

Low ambient cooling

Hard shut off expansion valve on indoor coil Liquid line solenoid on indoor coil

Required for single-phase scroll compressors in the following applications:

Long line

Low ambient cooling

Suggested for all compressors in areas with a history of low voltage problems.

3. Compressor Start Assist — PTC Type

Solid state electrical device which gives a ”soft” boost to the compressor at each start-up.

Usage Guideline:

Suggested in installations with marginal power supply.

4. 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 the chance of liquid slugging.

Usage Guideline:

Required in low ambient cooling applications. Required in long line applications.

Suggested in all commercial applications.

5. Cycle Protector

The cycle protector is designed to prevent compressor short cycling. This control provides an approximate 5-minute delay after power to the compressor has been interrupted for any reason, including power outage, protector control trip, thermostat jiggling, or normal cycling.

An SPST temperature-actuated switch that stops unit operation when evaporator reaches freeze-up conditions.

Usage Guideline:

Required when low ambient kit has been added.

7. Isolation Relay

An SPDT relay which switches the low-ambient controller out of the outdoor fan motor circuit when the heat pump switches to heating mode.

Usage Guideline:

Required in all heat pumps where low ambient kit has been added.

8. Liquid-Line Solenoid Valve (LLS)

An electrically operated shutoff valve which stops and starts refrigerant liquid flow in response to compressor operation. It is to be installed at the outdoor unit to control refrigerant off cycle migration in the heating mode.

Usage Guideline:

An LLS is required in all long line heat pump applications to control refrigerant off cycle migration in the heating mode. See Long Line Guideline.

9. Low-Ambient Pressure Switch Kit

A 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 pressure within normal operating limits (approximately 100 psig to 225 psig). The control will maintain working head pressure at low-ambient temperatures down to 0_F when properly installed.

Usage Guideline:

ALow-Ambient Pressure Switch or MotorMasterr Low-Ambient Controller must be used when cooling operation is used at outdoor temperatures below 55_F (12.8_C).

10.MotorMasterr Low-Ambient Controller

Afan-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 (-28.9_C), it maintains condensing temperature at 100_F ±10_F (37.8_C ± -12_C).

Usage Guideline:

A MotorMasterr Low Ambient Controller or Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor temperatures below 55_F (12.8_C).

Suggested for all commercial applications.

213R