The control board accumulates compressor run time. As the accumulated run time approaches the selected defrost interval time, the control board monitors the coil temperature sensor for a defrost demand. If a defrost demand exists, a defrost cycle will be initiated at the end of the selected time interval. A defrost demand exists when the coil temperature is at or below 32_F (0_C) for 4 minutes during the interval. If the coil temperature does not reach 32_F (0_C) within the interval, the interval timer will be reset and start over.

SUpon initial power up the first defrost interval is defaulted to 30

minutes. Remaining intervals are at selected times.

S Defrost is only allowed to occur below 50_F (10_C) outdoor ambient temperature.

The defrost cycle is terminated as described below.

SWhen OAT is > 30°F (-1.1°C), defrost terminates if outdoor coil

temperature > 50°F (+10°C).

SWhen OAT ≤ 30°F (-1.1°C), defrost will terminate if OCT is

>40°F (+4.4°C).

SOr 10 minutes has passed.

At the defrost termination, the outdoor fan output (ODF) will turn on 15 seconds before the reversing valve switching.

NOTE: Compressor speed during defrost varies based on outdoor conditions.

Step 13 — Check Charge

Charge in CHARGING mode

Factory charge amount and desired subcooling are shown in the user interface (UI). To properly check or adjust charge, conditions must be favorable for subcooling charging in cooling mode. Favorable conditions exist when the outdoor temperature is between 65_F and 100_F (18_C and 38_C), and the indoor temperature is between 70_F and 80_F (21_C and 27_C). If the temperatures are outside of these ranges, weigh-in charge only. If confirmation is needed return and check subcooling when the temperatures are within the desired range.

Charging Procedure: Unit is factory charged for 15ft (4.57 m) of lineset and for smaller rated indoor coil combinations. If any refrigerant charge adjustment is required based on the indoor coil combination you select and the line set length you input, the UI will calculate and display the target subcooling and the amount of additional charge to be added. Therefore UI is your source of information for charging the system correctly. Refrigerant charge adjustment amount for adding or removing 0.6 oz/ft (17.74 g/m) of 3/8 liquid line above or below 15ft (4.57 m) respectively, and an additional amount of refrigerant charge adjustment (2 lbs) for a large ID coil if required, is calculated and displayed by the UI.

Perform a final charge check only when in cooling and OD is between 65°F (18°C) and 100°F (38°C).

NOTE: UI indicates acceptable conditions if outside of this range. Do not charge if outside 65°F (18°C) and 100°F (38°C) outdoor temperature.

If the range is acceptable, go the CHARGING screen in the user interface (UI). At cooling conditions, set the user interface (UI) to check the charge in cooling mode. Allow system to operate in cooling mode for the stabilization period as indicated in the user interface (UI). Once conditions are indicated as favorable and stable by the user interface (UI), check the system charge by

subcooling method. Compare the subcooling taken at the liquid service valve to the subcooling target (LiqLin SC TGT) listed on the charging screen. Add refrigerant if the subcooling is low and remove charge if subcooling is high. Tolerance should be ±2°F.

If any adjustment is necessary, add or remove the charge slowly (no greater than 0.5 lb per minute) and allow system to operate for 15 minutes to stabilize before declaring a properly charged system.

The use of a commercial charge metering device (restrictor) such as Imperial liquid low side charger model 535-C or Watsco ChargeFaster model CH200 is recommended when adding refrigerant to an operating system. This prevents potential damage of liquid slugging of the compressor and allows the subcooling to stabilize quicker.

If the indoor temperature is above 80_F (26.67_C), and the outdoor temperature is in the favorable range, adjust system charge by weight based on line length and allow the indoor temperature to drop to 80_F (26.67_C) before attempting to check system charge by subcooling method as described above.

If the indoor temperature is below 70_F (21.11_C), or the outdoor temperature is not in the favorable range, adjust charge for line set length above or below 15ft (4.57 m) only. Charge level should then be appropriate for the system to achieve rated capacity. The charge level could then be checked at another time when the both indoor and outdoor temperatures are in a more favorable range. This ensures maximum efficiency and reliability.

Heating Check Chart Procedure

In heating mode, the required charging method is by weigh-in. On new installation or complete recharge, refer to the REQUIRED CHARGE CALCULATION screen in the user interface (UI) to obtain the required charge adjustment and/or total charge required. Use the UI and Heating Check Charts (Fig. 12 and 13) to check system operation during heating mode. The indoor conditions must be between 60°F (15.6_C) and 80°F (26.7_C) to check the charge. The outdoor coil must be dry and ice/frost free. Do not check for pressure agreement if the outdoor has rain, mist or snow present.

Use the Defrost CHECKOUT mode to remove ice or frost from coil, if present, prior to checking the heating pressures.

To use the Heating Check Chart, the user interface (UI) must be in CHARGING mode. These charts indicate whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units. If pressure and temperature do not match on chart, system refrigerant charge may not be correct. DO NOT USE CHART TO ADJUST REFRIGERANT CHARGE.

NOTE: High pressure is at vapor service valve. Add 12 psig if high pressure is taken from liquid service valve.

NOTE: When charging is necessary during heating season, charge must be weighed in accordance with unit rating plate, ±0.6 oz./ft (±17.74 g/m). of 3/8-in. liquid-line above or below 15 ft (4.57 m)., respectively.

NOTE: In heating mode, check refrigerant pressures only when user interface is in CHARGING mode and indicates stable. If charge is in doubt, remove charge and weigh-in correct calculated refrigerant charge.

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Bryant 280ANV installation instructions Check Charge Charge in Charging mode, Heating Check Chart Procedure
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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.
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