Accessory Usage Guideline - Carrier 38AYC Product Data

Accessory usage guideline

ACCESSORY
Crankcase Heater
Evaporator Freeze
Thermostat
Accumulator
Compressor Start Assist
Capacitor and Relay
Low-Ambient Controller
or
MotorMaster® Control
Wind Baffle See Low-Ambient Instructions
Coastal Filter
Support Feet
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft, refer to Residential's Split Systems Long-Line Application Guidelines.
† For buried line applications, refer to Residential's Split Systems Buried Line Application Guidelines.
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. 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 has been added.
3. 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.
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 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.
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. Heat Pump Risers
Six-in. tall plastic rails that are used to elevate outdoor units above mounting pad. The risers are adjustable from 24- to 34-in. long.
SUGGESTED USE: Heat pump installations in light to moderate snowfall areas.
Coastal installations.
Windy areas or where debris can circulate.
Rooftop installations.
8. 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. To prevent rapid compressor recycling, compressor 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).
9. Interface Control (Optimizer II)
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
predetermined economic balance point temperature, then switches to allow furnace operation only below that temperature. KHAIC0101AAA requires outdoor
thermostat (Item 14) to be adjusted for economic balance point temperature.
SUGGESTED USE: For all 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.
REQUIRED FOR REQUIRED FOR
LOW-AMBIENT
APPLICATIONS APPLICATIONS*
(Below 55 F)
Yes
Yes
No
Yes
Yes
No
Recommended
See Long-Line
No
Yes
REQUIRED FOR
LONG-LINE BURIED LINE
APPLICATIONS†
(Over 50 Ft) (Over 3 Ft)
Yes
No
No
Yes
No
No
No
No
Application
Guideline
No
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within 2 Miles)
Yes No
No No
Yes No
Yes No
No No
No No
No Yes
No Recommended
Yes No
No No
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