Bryant Comprehensive Guide for 187B Air Conditioner Installation and Maintenance
Page 11

OAT Thermistor must be locked in place with spherical nib end facing towards the front of the control box

OCT Thermistor must be secured tight on the liquid tube.

Fig. 8 - Outdoor Air Thermistor (OAT) Attachment

Fig. 9 - Outdoor Coil Thermistor (OCT) Attachment

 

 

Table 6 – TROUBLESHOOTING

 

 

 

 

 

 

AMBER

 

OPERATION

FAULT

LED

POSSIBLE CAUSE AND ACTION

FLASH

 

 

 

 

 

CODE

 

Standby – no call for unit op-

 

On sol-

 

None

id, no

Normal operation

eration

 

flash

 

 

 

 

Low---stage Cool/Heat Opera-

None

1, pause

Normal operation

tion

 

 

 

High-stage Cool/Heat Opera-

None

2, pause

Normal operation

tion

 

 

 

 

System Communications

16

Communication with user interface lost. Check wiring to User Interface, indoor

 

Failure

and outdoor units

 

 

 

Invalid Model Plug

25

Control does not detect a model plug or detects an invalid model plug. Unit

 

will not operate without correct model plug.

 

 

 

 

High Pressure Switch Open

31*

High---pressure switch trip. Check refrigerant charge, outdoor fan operation

 

and coils for airflow restrictions.

 

 

 

 

Low Pressure Switch Open

32*

Low pressure switch trip. Check refrigerant charge and indoor air flow

 

Control Fault

45

Outdoor unit control board has failed. Control board needs to be replaced.

 

Brown Out (230 v)

46

Line voltage < 187v for at least 4 seconds. Compressor and fan operation not

 

allowed until voltage>190v. Verify line voltage.

 

 

 

 

 

 

There is no 230v at the contactor when indoor unit is powered and cooling/

 

No 230v at Unit

47

heating demand exists. Verify the disconnect is closed and 230v wiring is

 

 

 

connected to the unit.

 

Outdoor Air Temp Sensor

53

Outdoor air sensor not reading or out of range. Ohm out sensor and check

 

Fault

wiring.

 

 

 

Outdoor Coil Sensor Fault

55

Coil sensor not reading or out of range. Ohm out sensor and check wiring.

 

Thermistors out of range

56

Improper relationship between coil sensor and outdoor air sensor. Ohm out

 

sensors and check wiring.

 

 

 

 

 

 

Compressor operation detected then disappears while low---stage demand

 

Low stage Thermal Cutout

71*

exists. Possible causes are internal compressor overload trip or start relay and

 

 

 

capacitor held in circuit too long(if installed)

 

 

 

Compressor operation detected then disappears while high---stage demand

 

High stage Thermal Cutout

72*

exists. Possible causes are internal compressor overload trip or start relay and

 

 

 

capacitor held in circuit too long (if installed)

 

Contactor Shorted

73

Compressor voltage sensed when no demand for compressor operation

 

exists. Contactor may be stuck closed or there is a wiring error.

 

 

 

 

No 230V at Compressor

74

Compressor voltage not sensed when compressor should be starting. Contac-

 

tor may be stuck open or there is a wiring error.

 

 

 

 

Low-stage Thermal Lockout

81

Thermal cutout occurs in three consecutive low/ high---stage cycles.

 

low---stage locked out for 4 hours or until 24v power recycled.

 

 

 

 

High-stage Thermal Lock-

82

Thermal cutout occurs in three consecutive high/low---stage cycles.

 

out

high---stage locked out for 4 hours or until 24v power recycled.

 

 

 

Low Pressure Lockout

83

Low pressure switch trip has occurred during 3 consecutive cycles. Unit oper-

 

ation locked out for 4 hours or until 24v power recycled.

 

 

 

 

High Pressure Lockout

84

High pressure switch trip has occurred during 3 consecutive cycles. Unit oper-

 

ation locked out for 4 hours or until 24v power recycled.

 

 

 

* Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.

187B / 180B

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Contents CUT Hazard Safety ConsiderationsInstallation Recommendations Electrical Shock HazardInstallation Refrigerant Tubing Connection Outdoor Install Liquid-Line Filter Drier IndoorUnit Operation and Safety Hazard Outdoor Unit Connected to Factory Approved Indoor UnitMake Electrical Connections Airflow Selection for FV4C Fan Coils non-com- municating System Functions and Sequence of OperationCompressor Crankcase Heater Airflow Selections ECM Furnaces non commu- nicatingCrankcase Heater Operation Time DelaysCommunication and Status Function Lights Compressor OperationCheck Charge Evolution Controlled Low Ambient CoolingFinal Checks Care and MaintenanceTroubleshooting Major Components Temperature ThermistorsFlash TroubleshootingAmber Operation Fault Possible Cause and ActionVS Furnace or Fan Coil Wiring with Communicating 2-Stage AC Puronr R-410A Refrigerant Quick Reference Guide Catalog No. II180---187B---01

187B specifications

The Bryant 187B is a cutting-edge heating and cooling solution designed for efficiency and performance in residential and light commercial applications. This HVAC unit incorporates advanced technologies that prioritize energy savings, user comfort, and reliability.

One of the primary features of the Bryant 187B is its two-stage cooling and heating capability. This technology allows the system to operate at lower capacity most of the time, which not only saves energy but also enhances indoor comfort by minimizing temperature fluctuations. When the demand increases, the system automatically ramps up to meet the needs, providing a consistent and comfortable environment.

Efficiency is a hallmark of the Bryant 187B, boasting a SEER rating of up to 18.5 and an AFUE rating of 80%. These ratings signify that the unit exceeds minimum efficiency requirements, leading to lower energy bills and a reduced carbon footprint. The inclusion of environmentally friendly refrigerants, such as R-410A, further emphasizes its commitment to sustainable practices.

Another notable characteristic of the Bryant 187B is its Quiet Operation technology. The unit is designed with sound-dampening features that reduce operational noise, ensuring that the indoor environment remains peaceful. This is particularly valuable in residential areas where noise pollution can be a concern.

The Bryant 187B also comes equipped with advanced thermostat compatibility, allowing homeowners to integrate smart home technologies seamlessly. This feature enables remote temperature control and scheduling, leading to more efficient energy use and enhanced comfort. Users can easily adjust settings through mobile applications, ensuring that their home is always at the desired temperature upon arrival.

Reliability is a key aspect of the Bryant 187B, featuring a robust construction designed to withstand various environmental conditions. With a durable cabinet and high-quality components, this unit is built to last and requires minimal maintenance.

Overall, the Bryant 187B exemplifies modern HVAC technology, combining efficiency, comfort, and reliability into a single cohesive system. It remains an excellent choice for those seeking an effective solution for heating and cooling needs, ensuring that homes remain comfortable throughout the year while being mindful of energy consumption.
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