Carrier 38YRA, Данные о продукции, Страница: 5 / 40

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Accessory usage guideline
* 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.
‡ Only when low-pressure switch is used.
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 or liquid line solenoid on indoor coil.
Units installed with low-ambient controller.
3. Compressor Start Assist — PTC Type
Solid state electrical device which gives a “soft” boost to the reciprocating compressor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
Replacement installations with rapid pressure balance (RPB) expansion valve on indoor coil.
Replacement installations with undersized interconnecting refrigerant tubes.
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. Cycle Protector
Solid-state timing device which prevents compressor rapid recycling. Control provides an approximate 5-minute delay after power to the compressor has been interrupted for any
reason, including normal room thermostat cycling.
SUGGESTED USE: Installations in areas where power interruptions are frequent.
Where user is likely to “play” with the room thermostat.
All commercial installations.
Installations where interconnecting tube length exceeds 50 ft.
High-rise applications.
6. Evaporator Freeze Thermostat
An SPST temperature actuated switch which stops unit operation when evaporator reaches freeze-up conditions.
SUGGESTED USE: With low-ambient controller.
7. Filter Drier—Bi-flow
A device for removing contaminants from refrigerant circulating in a heat pump system; 2-direction flow for heat pumps.
SUGGESTED USE: Split-system heat pumps.
8. 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 predetermined economic balance
point temperature, then switches to allow furnace operation only below that temperature. KHAIC0101AAA requires outdoor thermostat (Item 10) to be adjusted for economic balance
point temperature.
SUGGESTED USE: For heat pump and gas- or oil-fired furnace combination systems.
9. 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.
10. Liquid Solenoid Valve (LSV)
An electrically operated bi-flow shutoff valve to be installed at the outdoor unit and which stops and starts refrigerant liquid flow in response to compressor operation. Maintains a
column of refrigerant liquid ready for action at next compressor operation cycle.
SUGGESTED USE: For improved system performance in air conditioners for certain combinations of indoor and outdoor units. (Refer to ARI Unitary Directory.)
In certain long-line applications. (Refer to Long-Line Application Guideline.)
11. Low-Ambient Controller
Head pressure controller is a cycle control device activated by a temperature sensor mounted on a header tube of the outdoor coil. It is designed to cycle the outdoor fan motors in order
to maintain condensing temperature within normal operating limits (approximately 100
°
F high and 60
°
F low). The control will maintain working head pressure at low-ambient tem-
peratures down to 0
°
F when properly installed.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55
°
F (12.8
°
C).
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(Below 55
°
F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 50 Ft)
REQUIRED FOR
BURIED LINE
APPLICATIONS†
(Over 3 Ft)
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within 2 Miles)
Crankcase Heater Yes Yes Yes No
Evaporator Freeze
Thermostat Yes No No No
Winter Start Control Yes‡ No No No
Accumulator No No Yes No
Compressor Start Assist
Capacitor and Relay Yes Yes Yes No
Low Ambient Controller
or
MotorMaster® Control Yes No No No
Wind Baffle
See Low-Ambient
Instructions No No No
Coastal Filter No No No Yes
Support Feet Recommended No No Recommended
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV No
See
Long-Line
Application Guideline Yes No
Ball Bearing Fan Motor Yes No No No