Bryant 574D Instruction Manual download pdf (Page 32)

MOTOR

FAN GRILLE

MOTOR SHAFT

A08505

MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE

SIZE

“A”

IN. MM

24 7.3 185

30 7.3 185

36 7.3 185

42 7.6 193

48 7.6 193

60 7.6 193

Fig. 23 -- Fan Blade Position

Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be

sure to turn off the electrical power to the unit.

Remove access panels (see Fig. 20) to locate all the electrical

controls and wiring. Check all electrical connections for tightness.

Tighten all screw connections. If any smoky or burned connections

are noticed, disassemble the connection, clean all the parts, re--strip

the wire end and reassemble the connection properly and securely.

After inspecting the electrical controls and wiring, replace all the

panels. Start the unit, and observe at least one complete cooling

cycle to ensure proper operation. If discrepancies are observed in

operating cycle, or if a suspected malfunction has occurred, check

each electrical component with the proper electrical

instrumentation. Refer to the unit wiring label when making these

checks.

Refrigerant Circuit

Annually inspect all refrigerant tubing connections and the unit

base for oil accumulations. Detecting oil generally indicates a

refrigerant leak.

EXPLOSION, SAFETY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could result in personal

injury, death or property damage.

System under pressure. Relieve pressure and recover all

refrigerant before system repair or final unit disposal. Use

all service ports and open all flow--control devices,

including solenoid valves.

WARNING

If oil is detected or if low cooling performance is suspected,

leak--test all refrigerant tubing using an electronic leak--detector,

halide torch, or liquid--soap solution. If a refrigerant leak is

detected, refer to the Check for Refrigerant Leaks section.

If no refrigerant leaks are found and low cooling performance is

suspected, refer to the Checking and Adjusting Refrigerant Charge

section.

Gas Input

The gas input does not require checking unless improper heating

performance is suspected. If a problem exists, refer to the Start--Up

section.

Evaporator Airflow

The heating and/or cooling airflow does not require checking

unless improper performance is suspected. If a problem exists, be

sure that all supply-- and return--air grilles are open and free from

obstructions, and that the air filter is clean. When necessary, refer to

the Indoor Airflow and Airflow Adjustments section to check the

system airflow.

Puron Items

Metering Device (Thermostatic Expansion Valve

)

This metering device is a hard shutoff, balance port TXV. The

TXV maintains a constant superheat at the evaporator exit resulting

in higher overall system efficiency.

Pressure Switches

Pressure switches are protective devices wired into control circuit

(low voltage). They shut off compressor if abnormally high or low

pressures are present in the refrigeration circuit. These pressure

switches are specifically designed to operate with Puron (R--410A)

systems. R--22 pressure switches must not be used as replacements

for the Puron (R--410A) system.

Loss of Charge Switch

This switch is located on the liquid line and protects against low

suction pressures caused by such events as loss of charge, low

airflow across indoor coil, dirty filters, etc. It opens on a pressure

drop at about 20 psig. If system pressure is above this, switch

should be closed. To check switch:

1. Turn off all power to unit.

2. Disconnect leads on switch.

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

NOTE: Because these switches are attached to refrigeration

system under pressure, it is not advisable to remove this device for

troubleshooting unless you are reasonably certain that a problem

exists. If switch must be removed, remove and recover all system

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Bryant 574D Instruction Manual Page 32

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