ACCESSORY USAGE GUIDELINE
| REQUIRED FOR | REQUIRED FOR LONG | REQUIRED FOR SEA | |
Accessory | LINE APPLICATIONS* | COAST APPLICATIONS | ||
| (Below 55° F / 12.78° C) | (Over 80 Ft. / 24.38 m) | (Within 2 miles / 3.22 km) | |
Ball Bearing Fan Motor | Yes{ | No | No | |
Compressor Start Assist | Yes{ | Yes | No | |
Capacitor and Relay | ||||
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Crankcase Heater | Yes{ | Yes | No | |
Evaporator Freeze Thermostat | Yes{ | No | No | |
Isolation Relay | Yes{ | No | No | |
Liquid Line Solenoid Valve | No | See Long Line Application | No | |
Guideline | ||||
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Motor Master→ Control | Yes{ | No | No | |
or | ||||
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Support Feet | Recommended | No | Recommended |
*For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. vertical (6.09 m) differential, refer to Residential Split System Long Line Application Guideline.
{Required for
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.
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
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
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
6. Evaporator Freeze Thermostat
An SPST
Usage Guideline:
Required when low ambient kit has been added.
7. High Pressure Switch
A high pressure switch that protects unit against excessive pressure. Usage Guideline:
Required in all heat pumps operated in dual fuel applications.
8. Isolation Relay
An SPDT relay which switches the
Usage Guideline:
Required in all heat pumps where low ambient kit has been added.
9. 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.
10. 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
Usage Guideline:
A
25HCR3C
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