Bryant 598B Pressure Switch Protection, Major Components, Temperature Thermistors

Page 13

I. PRESSURE SWITCH PROTECTION

The outdoor unit is equipped with high- and low-pressure switches. If the control senses the opening of a high or low pressure switch, it will respond as follows:

1.De-energize the compressor low or high speed contactor,

2.Keep the outdoor fan operating for 15 minutes,

3.Display the appropriate error code on the status light (see Table 5).

4.After a 15 minute delay, if Yl or Y2 inputs are on and the LPS or HPS is reset, energize appropriate compressor contactor, either low or high.

5.If LPS or HPS has not closed after a 15 minute delay, the outdoor fan is turned off. If the open switch closes anytime after the 15 minute delay, then resume operation on call for Y1 and/or Y2.

J.MAJOR COMPONENTS

TWO-SPEED CONTROL

The two-speed control board controls the following functions:

-Low- and high-compressor contactor operation

-Outdoor fan motor operation

-Crankcase heater operation

-Compressor protection

-Pressure switch monitoring

-Time delays

FIELD CONNECTIONS

The two-speed control received 24vac low-voltage control system inputs through the screw connections on the left side of the control board.

TWO-SPEED COMPRESSOR

The two-speed compressor contains motor windings that provide 2-pole (3500 RPM) operation.

COMPRESSOR INTERNAL RELIEF

The compressor is protected by an internal pressure relief (IPR) which relieves discharge gas into compressor shell when differen- tial between suction and discharge pressures exceeds 525 psi. The compressor is also protected by an internal overload attached to motor windings.

THERMISTOR CURVE

 

90

(KOHMS)

80

70

 

 

60

RESISTANCE

50

20

 

40

 

30

10

0

0

20

40

60

80

100

120

TEMPERATURE (DEG. F)

A91431

Fig. 13—Resistance Values Versus Temperature

COMPRESSOR CONTROL CONTACTORS

Low and high capacity contactor coils are 24 volts. The electronic control board controls the operation of the low speed (C-L) and the high speed (C-H) contactors.

K. TEMPERATURE THERMISTORS

Thermistors are electronic devices which sense temperature. As the temperature increases, the resistance decreases. Thermistors are used to sense outdoor ambient and coil temperature. Refer to Fig. 13 for resistance values versus temperature.

If the outdoor ambient or coil thermistor should fail, a fault code appears at two-speed control.

IMPORTANT: Outdoor Air Thermistor Placement Mount out- door air thermistor underneath unit base pan lip on control box side of the unit. Attach to base pan with adhesive tape.

IMPORTANT: If outdoor air thermistor is not properly placed underneath base pan, unit may see nuisance thermistor out of range faults.

 

 

 

 

 

 

 

 

 

 

Reversing Valve

Connection

 

Low/High Speed

Contactor Connection

 

 

 

 

 

 

 

SS0ID

 

 

 

HP/AC

C

SEV RVS

C

HI

LO

 

 

 

 

 

 

 

 

CEBD430439-03A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R38

 

C2

 

 

 

 

 

 

 

 

 

Low Pressure

 

 

 

J1

 

R33

R9

 

 

 

PL1

 

PL2

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LPS

Switch Connector

 

R61

 

 

 

 

 

 

 

 

 

 

 

1

PL3

HPS

High Pressure

 

C31

 

 

 

 

 

 

 

 

 

 

 

 

 

Switch Connector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

PL4

OAT

 

R65

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEFROST

FORCED

 

 

 

 

 

 

 

 

 

 

 

 

 

OCT

Thermistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PL5

 

Connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PWM2

 

 

 

 

 

 

 

DEFROST

 

 

 

 

 

 

 

 

 

 

 

 

 

Defrost Time 30

 

TIME (MIN)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

R39

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R44

 

 

 

 

 

 

 

 

 

PWM1

 

 

 

 

 

 

 

R42

 

 

 

 

 

 

 

 

 

 

 

 

Selectors

60

1 2

30

C18

 

 

 

 

 

 

 

 

 

 

BRN

VC

 

R36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C16

 

 

 

 

 

 

 

 

 

 

 

 

To Run

 

 

90

 

 

 

 

 

 

 

 

 

 

 

 

BLU

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VH

Capacitor

 

Y2

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat

Y1

 

 

C O M M S T A T U S

 

 

 

 

 

 

 

 

BLK

ODF

 

W1

 

 

 

 

 

 

 

 

 

 

O.D.F. Connection

Low Voltage RC

 

 

D51

D52

 

 

 

 

CEPL130439-01

YEL

CCH L2

Connector

 

 

 

 

 

 

R85

 

R91

 

 

K1

 

 

RED

Crankcase Heater

 

 

 

 

 

 

 

R89

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R86

R87

 

 

 

 

 

 

 

 

Connection

 

 

 

 

A

B

C D

H K 3 8 E A 0 0 1

 

 

 

 

 

 

 

 

Reserved for

 

 

 

 

 

 

 

 

 

 

 

 

 

Future Use

 

 

 

 

 

 

 

 

 

 

A01192

Fig. 12—Control Board

—13—

Page 12 Page 14
Image 13
Page 12 Page 14
Contents Installation Recommendations Safety ConsiderationsII. Install on a SOLID, Level Mounting PAD Installation Check Equipment and JOB Site Unpack UnitDimensions Install TXVReplacing R-22 TXV or NON-BALANCE Port Puron TXV Installing TXV in Place of PistonLONG-LINE Applications VI. Make Piping Connections Outdoor Unit Connected to FACTORY- Approved Indoor Unit Install LIQUID-LINE Filter DrierRefrigerant Tubing Sweat ConnectionConnect Ground and Power Wires Route Ground and Power WiresConnect Control Wiring Final Tubing CheckVIII. Install Electrical Accessories General Accessory UsageLatent Capacity Control LCC Airflow Selection for FK4C or FV4A FAN CoilsTypical 24V Wiring Diagram See notes 1, 2, 3, Programmable FK4C, FV4A Thermidistat Wiring Diagram Notes Required LIQUID-LINE Temperature F XI. Check Charge Cooling only ProcedureSTART-UP Unit ChargeFactory Defaults Subcooling TemperaturesONE Minute Speed Change Time Delay XII. System Functions and Sequence of OPERA- TionTemperature Thermistors Pressure Switch ProtectionMajor Components XIII. Final Checks Care and MaintenanceWiring Diagram-024, 036 Wiring Diagram-060
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598B specifications

The Bryant 598B, a model in the world of heating, ventilation, and air conditioning (HVAC) systems, stands out due to its efficient and reliable performance. This compact air conditioning unit is engineered to provide optimal cooling, making it an excellent choice for various residential and light commercial applications.

One of the main features of the Bryant 598B is its impressive SEER (Seasonal Energy Efficiency Ratio) rating, which indicates its energy efficiency in cooling mode. With a SEER rating that often exceeds industry standards, the 598B helps homeowners save on energy bills while minimizing their carbon footprint. This high efficiency is a key advantage, especially in regions experiencing extreme temperatures.

The Bryant 598B utilizes advanced technologies that enhance its overall performance and longevity. One of the standout technologies is the two-stage compressor, which allows the unit to operate at different cooling capacities depending on the current heat load. This capability not only improves comfort levels by maintaining consistent temperatures but also reduces wear and tear on the system, leading to extended lifespan and reliability.

Another noteworthy characteristic of the 598B is its quiet operation. Equipped with a sound-dampening design, the unit minimizes operational noise, ensuring peaceful indoor and outdoor environments. This feature is especially appreciated in areas where noise reduction is a priority, such as residential neighborhoods.

The Bryant 598B also comes with a durable cabinet built from high-quality materials that resist corrosion and withstand harsh weather conditions. This durability is crucial for maintaining performance over time, providing peace of mind for homeowners who invest in this HVAC solution.

Installation and maintenance of the Bryant 598B are facilitated by its user-friendly design. The unit includes features that allow for straightforward access to components, making service and upkeep more manageable for HVAC professionals.

In conclusion, the Bryant 598B air conditioning unit offers an appealing combination of energy efficiency, advanced technology, quiet operation, and durability. Whether for a new home or a system replacement, the Bryant 598B is an excellent choice for those seeking reliable and effective cooling solutions that align with modern efficiency standards.
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