Carrier 38BYG Product Data page 5

Accessory usage guideline
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Accumulator
Compressor Start Assist
Capacitor and Relay
MotorMaster®—Low-Ambient Controller
Wind Baffle
Coastal Filter
Liquid-Line Solenoid Valve
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential, refer to Long-Line section of Application Guideline and Service Manual—
Air Conditioners and Heat Pumps Using R-22 Refrigerant.
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 MotorMaster®—Low-Ambient Controller is installed.
2. Coastal Filter
A mesh screen inserted under the top cover and inside the base pan to protect the condenser coil from salt damage without restricting airflow.
3. 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 single-phase 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
4. Compressor Start Assist – PTC Type
Solid-state electrical device which gives a "soft" boost to the compressor motor at each start up.
Usage Guideline:
Suggested when compressor power supply is marginal.
Suggested in reciprocating compressor applications 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 the chance of liquid slugging.
Note: Some heat pumps are factory supplied with a crankcase heater. See accessory list for units that come standard with a crankcase heater. For units that do
not, use the guideline below.
Usage Guideline:
Required in low ambient cooling applications.
Required in long line applications.
Suggested in all commercial applications.
6. Cycle Protector
Solid-state timing device which prevents compressor rapid recycling. This control provides an approximate 5-minute delay after power to the compressor has
been interrupted for any reason, including normal room thermostat cycling.
Usage Guideline:
Suggested in the following applications:
Installations in areas where power interruptions are frequent.
Where user is likely to "play" with the room thermostat.
All commercial installations.
Long line applications.
High-rise applications.
7. Evaporator Freeze Thermostat
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.
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(Below 55°F)
Yes
Yes
No
Yes
Yes
See Low-Ambient Instructions
No
No
Yes
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 50 Ft)
Yes
No
No
Yes
No
No
No
See Long-Line
Application
Guideline
No
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