DURASTAR DRF2TA2421ASTNJB5F (01) PDF Document

The DURASTAR DRF2TA2421ASTNJB5F 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

• 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 for the DURASTAR DRF2TA2421ASTNJB5F series provides specific details about the unit as described in the table below:

Airflow performance data for the DURASTAR DRF2TA2421ASTNJB5F is based on cooling performance with a coil and no filter in place. Select the performance table for the appropriate unit size, voltage, and number of electric heaters to be used. Make sure the external static pressure applied to the unit allows operation within the minimum and maximum limits shown in the “Airflow Operating Limits” table. 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.

All DURASTAR DRF2TA2421ASTNJB5F series air-handlers have 5-speed constant torque motors. The speed taps function as follows:

• Speed tap 1 is for continuous fan.

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

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

The DURASTAR DRF2TA2421ASTNJB5F air handlers are always shipped from the factory set to speed tap 5.

The low static speed taps (2 for lower tonnage and 4 for higher tonnage) are for external static pressures below 0.5″ WC. The high static speed taps (3 for lower tonnage and 5 for higher tonnage) are used for external static pressures exceeding 0.5″ WC. To change the speed, move the blue wire to the appropriate speed tap on the motor terminal block as required by the application.

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

• The airflow table lists the airflow information for air handlers with the maximum heater allowed for each model.

*Blower motors are all single phase motors.

The following table provides the electrical data for DURASTAR DRF2TA2421ASTNJB5F models when an auxiliary electric heat kit is installed.

• Electric heater BTUH = (heater watts + motor watts) x 3.414 (see airflow table for motor watts.)

• 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 non-standard fuse size is specified, use 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.

When installing the DURASTAR DRF2TA2421ASTNJB5F, follow these power wiring and grounding requirements:

• Field wiring must comply with the National Electrical Code.

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

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

• See electrical data for product Ampacity rating and Circuit Protector requirement.

• A grounding lug is provided.

The following accessories, kits, and parts are available for the DURASTAR DRF2TA2421ASTNJB5F air handler:

• Drain Pan Over Flow Switch RXHK-A01: This switch is used to detect condensate drain blockage. It will shut down the outdoor unit to prevent structural damage to the surrounding structures of the air handler.

• Bottom Return Conversion Kit (RXHK-B01 or RXHK-B02): This kit is used to divert the return air from the factory standard front return to a bottom return configuration.

• Louvered Cabinet Grill (RXHK-C01 or RXHK-C02): This serves as a decorative grill that covers the return air opening of the front return air handler.

• Decorative Wall Grill (RXHK-D01 or RXHK-D02): This grill is used in applications where the air handler is installed in a closet or interior wall. It allows for adequate return air to flow back to the unit.