DURASTAR DRF2TA2421ASTNJB8 (01) PDF Document

The DURASTAR DRF2TA2421ASTNJB8 air handler includes the following features:

• Front or Bottom Return with aluminum tube and fin coil

• TXV for cooling or heat pump operation

• Wall-hanging brackets

• Built-in Filter Rack

• Molex Plug Connections for field installed heater kits

• Dual Voltage Direct Drive Blower with multi-speed motor

• Thermoplastic Drain Pan with bottom primary and secondary connections

• Optional Decorative Grill for front return applications

• Optional Factory Installed Condensate Float Switch which shuts off the outdoor unit in the event the condensate pan becomes clogged

• Cabinet air leakage less than 2% at 1 inch H2O when tested in accordance with ASHRAE Standard 193

• Can be field wired for single or two stage applications

Standard equipment for the DURASTAR DRF2TA2421ASTNJB8 includes:

• Exclusive Incoloy sheath type electric heating elements

• Field convertible air supply

• Durable framed cleanable air filter

• Indoor coil design provides low air side pressure drop, high performance and compact size

• PVC condensate elbow is standard on all coils

• All indoor coils have aluminum tubing and aluminum fins

• Molded polymer corrosion resistant condensate drain pan

• Supply and return duct flanges

• High and low voltage connection points inside cabinet

• Concentric knockouts provided for power connection with hole size up to 2 inches [51 mm] for 1 1/2 inch [38mm] conduit

• Internal checked TX valves for quiet refrigerant metering

• Front refrigerant and drain connection

The model number is broken down as follows:

DR – Brand: Durastar

F – Product Category: Front Return

2 – Stages Of Airflow: 2-Stage

T – Motor Type: Constant Torque

A – Refrigerant: R-410A

24 – Capacity: 24,000 [7.03 kW]

21 – Width: 21″

A – Major Series: 1st Design

S – Efficiency: Standard

T – Metering: TXV

N – Coil Series: N Coil

J – Voltage: 208-240/1/60

B – Disconnect: Breaker

8 – Factory Heat: 8 kW

F – Option Code: Float Switch

Yes, a clearance of 24 inches (610 mm) is required in front of the unit for filter and coil maintenance.

For optimum blower performance, operate the DURASTAR DRF2TA2421ASTNJB8 in the 0.3 to 0.7 inches W.C. external static range. Units with coils should be applied with a minimum of 0.1 inch W.C. external static range.

The DURASTAR DRF2TA2421ASTNJB8 has a 5-speed constant torque motor. The unit is always shipped from the factory set to speed tap 5. To adjust the speed for your specific application, move the blue wire to the appropriate speed tap on the motor terminal block.

• Speed tap 1 is for continuous fan. The airflow for continuous fan is always set at 50% of the speed tap 4 airflow.

• Speed tap 2 (low static) and speed tap 3 (high static) are for lower tonnage applications (1.5 or 2.5 tons).

• Speed tap 4 (low static) and speed tap 5 (high static) are for higher tonnage applications (2.0 or 3.0 tons).

• Use the low static speed taps (2 and 4) for external static pressures below 0.5″ WC.

• Use the high static speed taps (3 and 5) for external static pressures exceeding 0.5″ WC.

The following table shows the airflow performance data for the DURASTAR DRF2TA2421ASTNJB8 (2 Tons model). This data is for dry delivery with filter and heaters.

*Blower motors are all single phase motors.

Follow these requirements for power wiring and grounding:

• Field wiring must comply with the National Electrical Code (C.E.C. in Canada) and any applicable local ordinance.

• The product must be sufficiently grounded in accordance with the National Electrical Code (C.E.C. in Canada) and any applicable local ordinance.

• Supply wiring must be 75°C minimum copper conductors only.

• A grounding lug is provided.

• Supply circuit protective devices may be fused or “HACR” type circuit breakers.

• If a non-standard fuse size is specified, use the next size larger standard fuse size.

The Drain Pan Over Flow Switch (model RXHK-A01) is an optional accessory used to detect a condensate drain blockage. If a blockage is detected, the switch will shut down the outdoor unit to prevent structural damage to the surrounding structures of the air handler.

The compatible Bottom Return Conversion Kit for the DURASTAR DRF2TA2421ASTNJB8 is model RXHK-B01. This kit is used to divert the return air from the factory standard front return to a bottom return configuration.

The compatible Louvered Cabinet Grill for the DURASTAR DRF2TA2421ASTNJB8 is model RXHK-C01. This accessory is used as a decorative grill that covers the return air opening of the front return air handler.

The Decorative Wall Grill, model RXHK-D01 or RXHK-D02, is an optional accessory used in applications where the air handler is installed in a closet or interior wall. It allows adequate return air back to the unit.