Bryant 280ANV Install Accessories, Start-Up, System Functions And Sequence Of Operation

Step 10 — Install Accessories

There are no refrigeration circuit or electrical accessories required or available for installation within the unit. External to the unit, the same accessories such as the liquid line solenoid, support feet, snow rack, wind baffle etc., are available on other Bryant units can also be used on this line of product. Refer to the individual Installation Instructions packaged with kits or accessories when installing.

Step 11 — Start-Up

!CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal injury, equipment damage or improper operation.

Observe the following:

1.Do not overcharge system with refrigerant.

2.Do not operate unit in a vacuum or at negative pressure.

3.Do not disable low pressure switch

4.Dome temperatures may be hot.

!CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal injury.

Wear safety glasses, protective clothing, and gloves when handling refrigerant.

!CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental damage.

Federal regulations require that you do not vent refrigerant to the atmosphere. Recover during system repair or final unit disposal.

Follow these steps to properly start up the system:

1.After system is evacuated, close the disconnects to energize the ID and OD units to assess the user interface (UI), Keep system in off mode. Under the Advanced function menu, assess the REQUIRED CHARGE CALCULATION screen. Enter the lineset length and vapor tube diameter. The user interface (UI) will now display the required charge adjust- ment (see Fig. 9) for the lineset and an adjustment for a large indoor coil if recognized as such by the UI.

2.Add or remove the required charge adjustment for lineset length to liquid service valve.

Note: If lineset is less than 15 feet (-9.4_C), charge re- moval may be necessary.

3.Fully open liquid and vapor service valves.

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Fig. 9 - Required Charge Adjustment Calculated in UI

4.Set User Interface to operate cooling in CHARGING mode. Charging mode operates system compressor speed and fan speeds to proper conditions to check the refrigerant charge.

NOTE: Do not check charge in a mode other than CHARGING.

5.Wait for the specified stabilization time, depending on lineset length. Compare subcooling at liquid line service valve to Liquid Line Subcooling Target as shown CHAR- GING screen (LiqLin SC TGT) (see Fig. 10).

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Fig. 10 - Liquid Line Subcooling Target

Step 12 — System Functions And Sequence Of Operation

The 280ANV models utilize an Evolution Communicating User Interface (UI). With a call for cooling, the outdoor fan and compressor are energized to run at lowest cooling demand. If this does not satisfy cooling demand, the system will ramp up in stages until it satisfies the demand. After coping with the higher demand, the unit returns to lower capacity operation until the demand is satisfied or until an increase in demand.

When all demand is satisfied, the compressor will shut off. As the unit operates at lower capacity, system vapor (suction) pressure will be higher than it is during a standard single-stage system operation or during a higher capacity operation.

When the outdoor ambient is more the 100_F (37.8_C), the outdoor fan will continue to run for one minute after compressor shuts off. This reduces pressure differential for easier starting in the next cycle.

The conventional thermostat inputs is designed to work for emergency operation only. Connections are Y, O and C. The system will only operate at maximum capacity, heating or cooling.

The user interface (UI) displays the operation mode and fault codes as specified in the troubleshooting section. See Table 7 for codes and definitions.

NOTE: Only one code will be displayed on the outdoor unit control board (the most recent, with the highest priority). The latest codes are stored and can be access via the UI.

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