Filter
Top Products
5
ACCESSORY DESCRIPTIONS
Refer to Table 1 for an Accessory Usage Guide for Air
Conditioners and Table 2 for Heat Pumps. Refer to the appropriate
section below for a description of each accessory and its use.
1. 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 cooling applications.
Required in long line applications.
Suggested in all commercial applications.
2. 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.
3. 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.
Usage Guideline:
Required in all heat pumps where low ambient kit has
been added
4. Low--Ambient Pressure Switch
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 Low Ambient Controller must be used when
cooling operation is used at outdoor temperatures
below 55_F (12.8_C).
Suggested for all commercial applications.
5. 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 is required to enable special
thermostat features such as auxiliary heat lock out.
Usage Guideline:
Suggested for all Bryant thermostats listed in this
publication.
6. 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.
Usage Guideline:
Accessory required to meet ARI rating and system
reliability, where indoor not equipped.
Hard shut off TXV or LLS required in heat pump
long line applications.
Required for use on all zoning systems.
7. 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:
Accessory required to meet ARI rating, where indoor
not equipped.
8. Wind Baffle
Use only in installations where high winds are prevalent to prevent
cross currents from causing abnormal control operation. For
construction, refer to Fig. 1 and Fig. 2.
NOTE: When wind baffles are used, raising unit off of mounting
pad with 4--in. support feet or unit risers is REQUIRED. This
provides better airflow for moderate and high ambient
temperatures.
9. Winter Start Control
This control is designed to alleviate nuisance opening of the
low--pressure switch by bypassing it for the first 3 minutes of
operation. This control is for AC units operating in low ambient
cooling but is not required for Heat Pumps. Heat pumps have a
loss of charge switch rather than a low pressure switch and
nuisance trips should not be an issue.