Start-Up, Make Airflow Selections | Carrier 24ANA instruction

24ANA

Make Airflow Selections

Airflow Setup for Infinity Control Furnace of FE Fan coil (communicating)

When using an Infinity User Interface, airflow is automatically selected based on equipment size. See User Interface Installation Instructions for available adjustments.

Airflow Selection for Variable Speed Furnaces for Models Using Non-Communicating (non-Infinity)

Thermostats

The variable speed furnaces provide blower operation to match the capacities of the compressor during high and low stage cooling operation, The furnace control board allows the installing technician to select the proper airflows for each stage of cooling. Below is a summary of required adjustments. See furnace installation instructions for more details:

1.Turn SW1-5 ON for 400 CFM/ton airflow or OFF for 350 CFM/ton airflow. Factory default is OFF.

2.The A/C DIP switch setting determines airflow during high stage cooling operation. Select the A/C DIP switch setting corresponding to the available airflow shown in the furnace installation instructions that most closely matches the re- quired airflow shown in the air conditioning Product Data for HIGH speed.

3.The CF DIP switch setting determines airflow during low stage cooling operation. Select the CF DIP switch setting corresponding to the available airflow shown in the furnace installation instructions that most closely matches the re- quired airflow shown in the air conditioning Product Data for LOW speed.

If a higher or lower Continuous Fan speed is desired, the Continuous Fan speed can be changed using the fan switch on the thermostat. Refer to the furnace installation instructions for details of how to use this feature.

Airflow Selection for FV4 Fan Coils for Models Using Non-Communicating (non-Infinity) Thermostats

The FV4B provides high- and low-stage blower operation to match the capacities of 24ANA7 compressor at high- and low-stage. The FV4C provides high- and low-stage blower operation to match the capacities of 24ANA1 compressor at high- and low-stage (units containing circuit board HK38EA015 or newer). To select recommended airflow, refer to the FV4 Installation Instructions. The FV4 utilizes an Easy Select control board that allows the installing technician to select proper airflows. For adjustments to control board and recommended A/C SIZE and CFM ADJUST selections. This fan coil has an adjustable blower off delay factory set at 90 sec. for high- and low-stage blower operation.

For other combinations of equipment consult the Product Data Sheet.

START-UP

!CAUTION

UNIT OPERATION AND SAFETY HAZARD

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

To prevent compressor damage or personal injury, observe the following:

S Do not overcharge system with refrigerant.

S Do not operate unit in a vacuum or at negative pressure. S Do not disable low pressure switch

S Dome temperatures may be hot in scroll and bottom temperatures may be hot in recip.

!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, fully back seat (open) liquid and vapor service valves.

2.Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow (back seated). Replace caps finger-tight and tighten with wrench an additional 1/12 turn.

3.Close electrical disconnects to energize system.

4.Set room thermostat or User Interface at desired temperat- ure. Be sure set point is below indoor ambient temperature and is set low enough to energize desired stage.

5.Set room thermostat or User Interface to COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. Check system refrigerant charge.

NOTE: Non-communicating (non-Infinity) Carrier electronic thermostats are equipped with a 15-minute staging timer. This timer prevents the 2-stage system from operating at high-stage until unit has been operating in low-stage for 15 minutes unless there is at least a ±5_F (±2.78_C) difference between room temperature and thermostat set point. To force high-stage (after a minimum of 2 minutes in low-stage), adjust the set point at least

±5_ (±2.78_C) below room ambient.

6.Set room thermostat to COOL and fan control to AUTO or ON as desired. Wait for appropriate time delay(s). Operate unit for 15 minutes. Check refrigerant charge.