Bryant LEGACY 213R Service Manual download pdf (Page 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 of f 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 char ge switch rather than a low pressure switch and

nuisance trips should not be an issue.

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Bryant LEGACY 213R Service Manual Page 5

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