Carrier 38BYC User Manual

5
Accessory usage guideline
* 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.
SUGGESTED USE: Required on all units where Low-Ambient kit (full modulation feature) or MotorMaster® Control has been added.
2. 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.
3. Compressor Start Assist — Capacitor and Relay
Start capacitor and start relay which 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.
4. Compressor Start Assist — PTC
Solid-state electrical device which gives a soft boost to compressor motor at each start-up.
SUGGESTED USE: Installation with marginal power supply.
Replacement installations with rapid pressure balance (RPB) expansion valve on indoor coil.
5. Evaporator Freeze Thermostat
An SPST temperature actuated switch which stops unit operation when evaporator reaches freeze-up conditions.
SUGGESTED USE: All units where low-ambient controller has been added.
6. Filter Drier — Bi-flow
A device for removing contaminants from refrigerant circulating in a heat pump system:2–direction flow.
SUGGESTED USE: Split-system heat pumps.
7. 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 about 425 psig.
Provides additional protection against compressor damage due to loss of outdoor airflow.
SUGGESTED USE: Installations exposed to very dirty outdoor air.
Installations where condenser inlet air temperature exceeds 125 ° F (51.7 ° C).
8. Inlet Grille Kit
A field-installed enhanced inlet grille to replace the standard inlet grille on residential air conditioners and heat pumps.
SUGGESTED USE: For greater protection against inclement weather, incidental damage, and vandalism.
9. Interface Control
An electric control for controlling a heat pump and gas or oil furnace system for maximum energy savings. It allows heat pump to operate down to a pre-
determined economic balance point temperature, then switches to allow furnace operation only below that temperature. KHAIC0101AAA requires outdoor
thermostat to be adjusted for economic balance point temperature.
SUGGESTED USE: For heat pump and gas- or oil-fired furnace combination systems.
10. 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.
SUGGESTED USE: All heat pumps where low-ambient controller has been added.
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(Below 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 50 Ft)
Crankcase Heater
Ye s Ye s
Evaporator Freeze Thermostat Ye s N o
Accumulator No No
Compressor Start Assist
Capacitor and Relay
Ye s Ye s
MotorMaster® Control Ye s N o
Wind Baffle See Low-Ambient Instructions No
Coastal Filter No No
Support Feet Recommended No
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
Ball Bearing Fan Motor Ye s N o

Carrier 38BYC Specifications

General

Brand	Carrier
Model	38BYC
Category	Heat Pump
Language	English