DURASTAR DRF2TA2421ASTNJB5 (01) PDF Document

The DURASTAR DRF2TA2421ASTNJB5 air handler includes the following features and benefits:

• 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 DRF2TA2421ASTNJB5 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 provides specific details about the unit. Here is a breakdown:

The specifications for the DURASTAR DRF2TA2421ASTNJB5 (model DRF2TA2421) are as follows:

Airflow performance data is based on cooling performance with a coil and no filter in place. For optimum blower performance, operate the unit in the .3 [8 mm] to .7 inches [18 mm] W.C. external static range. Units with coils should be applied with a minimum of .1 inch [3 mm] W.C. external static range.

The following table provides the airflow performance data for the 2 Ton model (DRF2TA24) with a 10×6 1/3 Hp, 2-speed dual voltage motor, based on various motor speeds and external static pressures.

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 or 2.5 tons). Speed tap 4 (low static) and speed tap 5 (high static) are for higher tonnage (2.0 or 3.0 tons).

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

• The low static speed tap 2 (lower tonnage) and 4 (higher tonnage) are for external static pressures below 0.5″ WC. The high static speed tap 3 (lower tonnage) and 5 (higher tonnage) are 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 above airflow table lists the airflow information for air handlers with maximum heater allowed for each model.

The electrical specifications for the blower motor without electric heat for model DRF2TA2421 are:

*Blower motors are all single phase motors.

Installation of U.L. Listed original equipment manufacturer provided heater kits is recommended. Below are the electrical specifications for the DRF2TA2421 (compatible with heater kits starting with RXHJ-21B) with various electric heat kits.

Please adhere to the following electrical wiring requirements:

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

• This 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.

• Refer to the electrical data for the product Ampacity rating and Circuit Protector requirement.

• A grounding lug is provided.

Additional notes:

• Electric heater BTUH = (heater watts + motor watts) x 3.414.

• J voltage (230V) single phase air handler is designed to be used with single or three phase.

• 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. Without the heater, bring only two leads to terminal block, cap, insulate and fully secure the third lead.

• Largest motor load is included in single circuit or circuit 1 of multiple circuits.

• Do not use 480 volts electrical heaters on 230 volts air handler.

The following accessories and kits are available for the DURASTAR DRF2TA2421ASTNJB5:

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

• 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: This grill is used in applications where the air handler is installed in a closet or interior wall, allowing for adequate return air back to the unit. Refer to the installation instructions for complete dimensional information.