DURASTAR DRF2TA3624ASTNJB3 (01) PDF Document

The DURASTAR DRF2TA3624ASTNJB3 air handler is designed with the following features and benefits:

General Features:

• Constant Torque Motor (ECM)

• Two-Stage Airflow

• Thermal Expansion Valve (TXV)

• Efficiencies from 13.4 to 14.3 SEER2

Detailed Benefits:

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

• TXV for cooling or heat pump operation.

• Wall-hanging brackets included.

• Built-in Filter Rack.

• Molex Plug Connections for field installed heater kits.

• Dual Voltage Direct Drive Blower with a 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 if the condensate pan becomes clogged.

• Cabinet air leakage is 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.

The DURASTAR DRF2TA3624ASTNJB3 air handler comes with the following standard equipment:

• Exclusive Incoloy sheath type electric heating elements.

• Field convertible air supply.

• Durable framed cleanable air filter.

• Indoor coil design that 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 the cabinet.

• Concentric knockouts provided for power connection with a 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 DURASTAR DRF2TA3624ASTNJB3 is configured for vertical upflow only and cannot be installed in any other configuration. The unit can be installed with either a front or bottom return.

Clearance:

A clearance of 24 inches [610 mm] is required in front of the unit for filter and coil maintenance.

Connections:

• High Voltage Connection: 1 3/8″ [35 mm] and 7/8″ [22 mm] knockouts are provided.

• Liquid Line Connection: Copper (sweat).

• Vapor Line Connection: Copper (sweat).

Return Air Opening Dimensions:

The specifications for the DURASTAR DRF2TA3624ASTNJB3 are as follows:

Airflow performance data is based on cooling performance with a coil and no filter in place. The external static pressure applied to the unit must allow operation within the minimum and maximum limits shown below. For optimal 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 details the CFM Dry Delivery, RPM, and Watts for the DURASTAR DRF2TA3624ASTNJB3 air handler (3 Ton capacity) at various external static pressures. This model uses a 10×8 1/2 Hp 2-speed dual voltage motor.

All DURASTAR DRF2TA air handlers have 5-speed constant torque motors. The speed taps are configured for different applications:

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

• Speed tap 2 (low static): For lower tonnage (1.5 or 2.5 tons).

• Speed tap 3 (high static): For lower tonnage (1.5 or 2.5 tons).

• Speed tap 4 (low static): For higher tonnage (2.0 or 3.0 tons), such as the DRF2TA3624ASTNJB3. This tap is for external static pressures below 0.5″ WC.

• Speed tap 5 (high static): For higher tonnage (2.0 or 3.0 tons), such as the DRF2TA3624ASTNJB3. This tap is used for external static pressures exceeding 0.5″ WC.

Configuration Change:

DURASTAR DRF2TA air handlers are always shipped from the factory set to speed tap 5. To change the speed, move the blue wire to the appropriate speed tap on the motor terminal block as required by the application needs.

The electrical specifications for the blower motor only on a DURASTAR DRF2TA3624ASTNJB3 are detailed below. Note that all blower motors are single-phase.

Installation of a U.L. Listed original equipment manufacturer provided heater kit is recommended for all auxiliary heating requirements. The DURASTAR DRF2TA3624ASTNJB3 uses RXHJ-24B series heater kits. The electrical data is as follows:

Power Wiring Grounding

• 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.

• A grounding lug is provided.

Circuit Protection and Sizing

• 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.

• For units without a heater, bring only two leads to the terminal block, then cap, insulate, and fully secure the third lead.

• The largest motor load is included in the single circuit or circuit 1 of multiple circuits.

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

Several accessories and kits are available for the DURASTAR DRF2TA3624ASTNJB3 air handler:

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

• Bottom Return Conversion Kit (RXHK-B02): This kit is used to divert the return air from the factory standard front return to a bottom return configuration. To install, you remove the bottom coil panel and install the new front coil panel.

• Louvered Cabinet Grill (RXHK-C02): This is a decorative grill that covers the return air opening of the front return air handler. It attaches with thumb screws and insert nuts.

• Decorative Wall Grill (RXHK-D01 or RXHK-D02): Used in applications where the air handler is installed in a closet or interior wall, this grill allows adequate return air back to the unit. Refer to the specific installation instructions for dimensional information when selecting a grill.