Outdoor Coil Thermistor, Suction Thermistor OST

Outdoor Coil Thermistor

The outdoor coil thermistor is a 10Kohm resistor used for multiple system operations. It provides the coil/liquid line temperature to the heat pump board and user interface. Low ambient operation, defrost initiation, defrost termination and assistance with OAT temperature measurement of some of the functions. The sensor must be securely mounted to the tube connecting the EXV and distributor. See Fig. 15 for proper placement. See Table 4 for proper resistances.

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

A11142

Fig. 15 - OAT Thermistor Location (Bottom of Control Box)

OCT SENSOR

LOCATION

A11143

Fig. 16 - Outdoor Coil Thermistor (OCT) Attachment

(On Distributor Tube)

Suction Thermistor (OST)

Suction Thermistor is used for assisting in EXV control and must be secured on the suction tube and aligned longitudinally to the vertical surface of the tube axis (see Fig. 17).

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

In order to minimize the ambient influence, make sure the thermistor curved surface hugs the pipe surface and is secured tight using the wire tie fished through the original slot insulating polymer body.

Variable Speed Compressor Sensor Output Terminals

This compressor has a motor thermistor and a scroll thermistor. Correct resistance between scroll thermistor terminal and common is 10k at 77_F (25_C). Correct resistance between motor thermistor terminal and common is 5k at 77_F (25_C).

Variable Speed Compressor Power Input Terminals

This compressor operates with a 3-phase variable frequency PWM variable voltage to the three fusite terminals.

Table 5 – Variable Speed Compressor Resistances

(winding resistance at 70_F 20_F)

WINDING	280ANV024	280ANV048
WINDING	280ANV036	280ANV060
	280ANV036	280ANV060

Between terminals	.681	.203
T1, T2, and T3	.681	.203
T1, T2, and T3

Between terminal &	>1 mega OHM	>1 mega OHM
ground	>1 mega OHM	>1 mega OHM
ground


!	CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage and/or improper operation.

Do not use Meggar for measuring the winding resistance.

PRESSURE TRANSDUCER (SPT)

ACCUMULATOR TUBE

SUCTION TUBE

COMPRESSOR

SUCTION THERMISTOR (OST)

ACCUMULATOR

REVERSING VALVE

SUCTION SERVICE VALVE

A11103

Fig. 17 - Suction Thermistor (OST) Attachment

(On Suction Tube)

ECM Fan Motor

If verification of proper operation is required for the ECM motor used in this unit, follow these steps:

1.Verify that the 230v input to the transformer is present.

2.Verify that the control board is powered 18 volts to 30 volts from the transformer.

3.With the UI in charging mode in cooling, measure the DC voltage between the PWM 1 and PWM 2 terminals on the outdoor control board. The DC voltage and PWM (option- al) measured must be as shown in Table 6.

Table 6 – DC Voltage and PWM Measurement

Unit Size	Voltage	PWM

024, 036	8.9 VDC	52

048, 060	11.1 VDC	84

280ANV specifications

The Bryant 280ANV is a highly efficient air conditioning unit designed for residential use, providing homeowners with reliable cooling performance while maintaining energy efficiency. One of the standout features of the Bryant 280ANV is its two-stage compressor, which allows for variable speed operation. This means that the unit can adjust its cooling output to match the current demand for indoor comfort, leading to more consistent temperatures and increased energy savings.

The Bryant 280ANV also boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, which indicates its energy efficiency. Typically, this model achieves a SEER rating of up to 20, making it a strong contender in the market for those looking to reduce their energy bills without sacrificing comfort. This level of efficiency not only results in lower monthly costs but also contributes to a reduced environmental footprint.

Another key technology featured in the Bryant 280ANV is its advanced, variable-speed blower motor. This motor helps to operate quietly while ensuring optimal airflow throughout the home. The quiet operation of the 280ANV means that it can deliver cooling without disturbing your daily life, making it an excellent choice for bedrooms or other quiet spaces.

The unit is also designed with durability in mind. Its cabinet is constructed from high-quality, weather-resistant materials that protect against harsh outdoor conditions. This ensures longevity and reliable performance over the years. Furthermore, the Bryant 280ANV includes a protected scroll compressor that adds an extra layer of reliability and enhances the unit's overall efficiency.

Installation of the Bryant 280ANV can be completed by a qualified HVAC professional, who can ensure that the system is set up to operate at peak performance. Additional features, such as the built-in Wi-Fi capability, allow homeowners to connect the unit to smart home systems for enhanced control and convenience.

In conclusion, the Bryant 280ANV combines energy efficiency with advanced technology to provide effective cooling solutions for residential spaces. With its two-stage compressor, high SEER rating, quiet operation, and durable construction, it meets the needs of modern homeowners who value comfort, efficiency, and reliability. Overall, the Bryant 280ANV stands out as a quality choice for those seeking a dependable air conditioning system.