DURASTAR DRF2TA3624ASTNJB1 (01) PDF Document

The DURASTAR DRF2TA3624ASTNJB1 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

The standard equipment for this model 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:

• DR – Brand: Durastar
• F – Product Category: Front Return
• 2 – Stages of Airflow: 2-Stage
• T – Motor Type: Constant Torque
• A – Refrigerant: R-410A
• 36 – Capacity: 36,000 BTU [10.55 kW]
• 24 – Width: 24.5″
• 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
• 1 – Factory Heat: 10 kW

Model	(A) Unit Width In. [mm]	(B) Unit Height In. [mm]	(C) Unit Depth In. [mm]	(D) Return Air Opening Width In. [mm]	(E) Return Air Opening Height In. [mm]	Filter Size in. x in. x in. [mm x mm x mm]	Air Flow CFM (Nom.) [L/s] Low/High	Unit Weight/Shipping Weight (Lbs.) [kg]
DRF2TA3624	24 [609.6]	36 [914.4]	21 [533.4]	23 [584.2]	21 3/8 [542.9]	20 X 25 X 1 [508 X 635 X 25.4]	1000 [472] / 1200 [566]	95 [43] x 105 [48]

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.

Airflow Operating Limits (Model Cabinet Size 24)	Value
Cooling BTUH x 1,000	-36
Cooling Tons Nominal	3
Heat Pump or Air Conditioning Maximum Heat/Cool CFM [L/s] (450 CFM [212 L/s]/Ton Nominal)	1350 [637]
Heat Pump or Air Conditioning Nominal Heat/Cool CFM [L/s] (400 CFM [189 L/s]/Ton Nominal)	1200 [566]
Heat Pump or Air Conditioning Minimum Heat/Cool CFM [L/s] (360 CFM [170 L/s]/Ton Nominal)	1080 [510]
Maximum kW Electric Heating & Minimum Electric Heat CFM [L/s]	10 / 976 [461]
Maximum Electric Heat Rise °F [°C]	44 [7]

The following table shows the CFM dry delivery, RPM, and Watts at various external static pressures for the DRF2TA36 (3 Tons) model with a 10×8 1/2 Hp 2-speed dual voltage motor.

Motor Speed	Metric	External Static Pressure-Inches W.C.
		0.1	0.2	0.3	0.4	0.5	0.6	0.7
4	CFM	808	750	698	633	568	504	448
	RPM	615	665	713	780	842	884	929
	Watts	91.4	97.7	103.9	112.4	120.2	125.5	131.2
5	CFM	1241	1201	1148	1109	1065	1028	983
	RPM	847	880	905	916	955	991	1035
	Watts	246.3	254.9	260.9	263.8	273.1	282.5	293.3

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

The electrical data for the blower motor without electric heat is as follows. Blower motors are all single phase motors.

Model/Nominal Cooling Tons	Voltage	Phase	Hertz	HP [W]	RPM	Speeds	Circuit Amps.	Minimum Circuit Ampacity	Maximum Circuit Protector
DRF2TA3624	208/230	1	60	1/2 [373]	300-1100	4	2.7	4	15

Installation of a U.L. Listed original equipment manufacturer provided heater kit is recommended for all auxiliary heating requirements. The electrical data for compatible heater kits is below.

Cooling Capacity Tons	Heater Model No.	Heater kW	PH/Hz	No. Elements – kW Per	(208/240V) Type Supply Circuit	Circuit Amps.	Motor Ampacity	Minimum Circuit Ampacity	Maximum Circuit Protection
DRF2TA3636	RXHJ-24B/T03J	2.25/3.0	1/60	1-3.0	Single	10.8/12.5	2.7	17/19	20/20
	RXHJ-24B/T05J	3.6/4.8	1/60	1-4.8	Single	17.3/20.0	2.7	25/29	25/30
	RXHJ-24B/T08J	5.4/7.2	1/60	2-3.6	Single	26.0/30.0	2.7	36/41	40/45
	RXHJ-24B/T10J	7.2/9.6	1/60	2-4.8	Single	34.6/40.0	2.7	47/54	50/60

• 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.

• 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.

• 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.

Several kits and accessories are available for specific applications:

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

• 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. It is compatible with the DRF2TA-FR36 model.

• Louvered Cabinet Grill RXHK-C02: This is used as a decorative grill which covers the return air opening of the front return air handler. It is compatible with the DRF2TA-FR36 model.

• Decorative Wall Grill RXHK-D01 or RXHK-D02: This is used in applications where the air handler is installed in a closet or interior wall and allows adequate return air back to the unit. Refer to installation instructions for complete dimensional information when selecting a decorative wall grill.