6
Accessory description and usage (continued)
10. Liquid-LIne Solenoid Valve (LSV)
An electrically operated 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.
NOTE:
Compressor Start Assist — Capacitor and Relay must be used also on reciprocating compressors.
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 the Residential Split-System Long-Line Application Guideline.
11. Low-Ambient Pressure Switch
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 low-ambient temperatures down to 0°F when properly installed.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
12. MotorMaster® Control
A fan speed control device activated by a temperature sensor. Designed to control condenser fan motor speed in response to the saturated, condensing temperature during
operation in cooling mode only. For outdoor temperatures down to –20°F, it maintains condensing temperature at 100°F ± 10°F.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F.
All commercial installations.
13. Outdoor Air Temperature Sensor
A device that allows the temperature at a remote location (outdoors) to be displayed on the thermostat.
SUGGESTED USE: All Carrier programmable thermostats.
14. Outdoor Thermostat
An SPDT temperature-actuated switch which turns on supplemental electric heaters when outdoor air temperature drops below set point.
SUGGESTED USE: Heat pump installations with multiple-stage supplemental heaters.
15. Secondary Outdoor Thermostat
An SPDT temperature actuated switch which turns on third-stage of supplemental electric heaters when outdoor air temperature drops below the second-stage set point.
SUGGESTED USE: Heat pump installations where 3-stage operation of supplemental heaters is desired.
16. Sound Hood
Wraparound sound reducing cover for the compressor. Reduces the sound level by about 2 dBA.
SUGGESTED USE: Unit installed closer than 15 ft to quiet areas—bedrooms, etc.
Unit installed between 2 houses less than 10 ft apart.
17. Thermostatic Expansion Valve (TXV) Bi-Flow
A modulating flow-control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving the evaporator.
Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB valves are available. Do not use hard shutoff TXV with Liquid-Line Solenoid
Valve. Hard shutoff TXV requires Compressor Start Assist — Capacitor and Relay on units with single-phase reciprocating compressors.
SUGGESTED USE: For improved system performance in cooling mode for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
Required for use on all zoning systems.
18. Time-Delay Relay
An SPST delay relay which briefly continues operation of the indoor blower motor to provide additional cooling after the compressor cycles off.
SUGGESTED USE: For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
Required for use on all zoning systems.
SOUND POWER (A-weighted, non-pure tone corrected.)
NOTE:
Tested in accordance with ARI standard 270.95. (Not listed with ARI.)
UNIT SIZE
SOUND LEVEL
(dBA)
OCTAVE BAND CENTER FREQUENCY (Hz)
125
250
500
1000
2000
4000
8000
018
78
49.5
58.0
66.5
69.5
67.0
66.5
59.5
024
78
50.5
59.0
64.5
68.0
67.5
67.5
61.5
030
80
57.5
64.5
68.5
72.5
72.5
70.0
64.0
036
81
60.5
67.5
73.0
76.0
73.0
69.5
63.5
042
80
59.0
65.0
70.5
75.5
72.0
69.5
64.0
048
80
54.5
63.5
69.5
75.0
71.0
70.0
67.5
060
80
56.0
64.5
73.0
74.5
71.0
71.0
63.0
