—9—
ACCESSORY DESCRIPTION AND USAGE (continued)
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.
Usage Guideline:
Required in low ambient applications.
Required in long line applications.
Suggested in all commercial applications.
6.
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.
7.
Liquid-Line Solenoid Valve (LLS)
This device serves two purposes. It is an electrically operated shutoff valve which stops and starts refrigerant liquid flow in response to compressor oper-
ation. It maintains a column of refrigerant liquid ready for action at next compressor operation cycle. It also provides system protection against off-cycle
refrigerant migration.
Note:
When LLS is used with reciprocating compressors, Compressor Start Assist — Capacitor and Relay is required.
Usage Guideline:
Required in air conditioner long line applications with a piston indoor metering device to prevent off cycle refrigerant migration. A hard shut
off TXV can be used instead of an LLS in single flow air conditioner applications. See Long Line Application Guideline.
8.
MotorMaster®—Low-Ambient Controller
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 (–28.9°C), it maintains condensing temperature at 100°F ±
10°F (37.8°C ± –12°C).
Usage Guideline:
A MotorMaster®—Low-Ambient Controller or Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor tem-
peratures below 55°F (12.8°C).
Suggested for all commercial applications.
9.
Outdoor Air Temperature Sensor
Designed for use with Bryant Thermostats listed in this publication. This device enables the thermostat to display the outdoor temperature. This device also
is required to enable special thermostat features such as auxiliary heat lock out.
Usage Guideline:
Suggested for all Bryant thermostats listed in this publication.
10.
Sound Hood
Wraparound sound reducing cover for the compressor. Reduces the sound level by about 2 dBA.
Usage Guideline:
Suggested when unit is installed closer than 15 ft to quiet areas—bedrooms, etc.
Suggested when unit is installed between two houses less than 10 ft apart.
11.
Support Feet
Four stick-on plastic feet that raise the unit 4 in. above the mounting pad. This allows sand, dirt, and other debris to be flushed from the unit base, minimizing
corrosion.
Usage Guideline:
Suggested in the following applications:
Coastal installations.
Windy areas or where debris is normally circulating.
Rooftop installations.
For improved sound ratings.
12.
Thermostatic Expansion Valve (TXV)
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. Hard shut off types are available.
Note:
When using a hard shut off TXV with single phase reciprocating compressors, a Compressor Start Assist — Capacitor and Relay is required.
Usage Guideline:
Required to achieve ARI ratings in certain equipment combinations. Refer to combination ratings.
Hard shut off TXV or LLS required in air conditioner long line applications
Required for use on all zoning systems.
13.
Time-Delay Relay
An SPST delay relay which briefly continues operation of indoor blower motor to provide additional cooling after the compressor cycles off.
Note:
Most indoor unit controls include this feature. For those that do not, use the guideline below.
Usage Guideline:
For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
A-WTD. SOUND POWER (dBA)
NOTE: Tested in accordance with ARI Standard 270.95. (Not listed with ARI.)
UNIT
SIZE-SERIES
STANDARD
RATING
TYPICAL OCTAVE BAND SPECTRUM (without tone adjustment)
125
250
500
1000
2000
4000
8000
024-G
71
62.0
61.5
63.0
65.0
62.0
57.5
48.0
030-F
71
60.5
59.0
62.5
65.0
63.0
59.5
52.0
036-F
73
60.0
62.0
65.0
68.0
64.0
61.0
52.5
042-F
73
60.0
63.0
67.0
68.0
66.0
62.0
54.0
048-B
76
57.5
63.5
69.0
71.0
63.0
58.0
50.5
060-A
78
56.5
67.0
71.5
70.5
70.5
60.5
53.0
