DURASTAR DRF2TA2421ASTNJB1F (01) PDF Document

The DURASTAR DRF2TA2421ASTNJB1F air handler includes the following features and benefits:

• Front or Bottom Return with an aluminum tube and fin coil.

• Thermal Expansion Valve (TXV) for cooling or heat pump operation.

• Wall-hanging brackets for installation flexibility.

• A built-in Filter Rack.

• Molex Plug Connections for field-installed heater kits.

• A Dual Voltage Direct Drive Blower with a multi-speed motor.

• A Thermoplastic Drain Pan with bottom primary and secondary connections.

• An optional Decorative Grill is available for front return applications.

• An optional Factory Installed Condensate Float Switch can be added, which shuts off the outdoor unit if the condensate pan becomes clogged.

• The cabinet has an air leakage rate of less than 2% at 1 inch H2O when tested in accordance with ASHRAE Standard 193.

• It can be field-wired for single or two-stage applications.

The standard equipment for the DURASTAR DRF2TA2421ASTNJB1F includes:

• Exclusive Incoloy sheath type electric heating elements.

• Field convertible air supply.

• A durable framed cleanable air filter.

• An indoor coil design that provides low air side pressure drop, high performance, and a compact size.

• A PVC condensate elbow is standard on all coils.

• All indoor coils feature aluminum tubing and aluminum fins.

• A molded polymer corrosion-resistant condensate drain pan.

• Supply and return duct flanges.

• High and low voltage connection points located inside the cabinet.

• Concentric knockouts for power connection, with hole sizes up to 2 inches for 1 1/2 inch conduit.

• Internal checked TX valves for quiet refrigerant metering.

• Front refrigerant and drain connection.

The model number provides specific information about the unit. Here is a breakdown:

The dimensions and weights for the DURASTAR DRF2TA2421ASTNJB1F are as follows:

The airflow operating limits for the DURASTAR DRF2TA2421ASTNJB1F (Cabinet Size 21) are as follows. For optimum blower performance, operate the unit in the 0.3 to 0.7 inches W.C. external static range.

The following table shows the CFM dry delivery, RPM, and Watts at various external static pressures for the 2-ton model.

NOTE: All DRF2TA air handlers have 5-speed constant torque motors.

• Speed tap 1 is for continuous fan.

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

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

• DRF2TA air handlers are always shipped from the factory at speed tap 5.

• The low static speed tap 4 is for external static pressures below 0.5″ WC. The high static speed tap 5 is used for external static exceeding 0.5″ WC. Move the blue wire to the appropriate speed tap on the motor terminal block as required by the application needs.

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

The electrical data for the blower motor only (no electric heat) is as follows:

When installing a U.L. Listed original equipment manufacturer provided heater kit, refer to the following electrical data. The table below applies to the DURASTAR DRF2TA2421ASTNJB1F (2 Ton capacity).

Notes:

• 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.

Follow these requirements for electrical power wiring and grounding:

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

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

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

• A grounding lug is provided.

The following accessories, kits, and parts are available for the DURASTAR DRF2TA2421ASTNJB1F:

• Drain Pan Over Flow Switch RXHK-A01: This switch detects condensate drain blockage and shuts down the outdoor unit to prevent water damage.

• Bottom Return Conversion Kit RXHK-B01: This kit is used to divert the return air from the standard front return to a bottom return configuration.

• Louvered Cabinet Grill RXHK-C01: This is a decorative grill that covers the return air opening of the front return air handler.

• Decorative Wall Grill RXHK-D01 or RXHK-D02: These grills are used when the air handler is installed in a closet or interior wall, allowing adequate return air back to the unit.