DURASTAR DRF2TA3624ASTNJB8F (01) PDF Document

The DURASTAR DRF2TA3624ASTNJB8F air handler includes the following features and benefits:

General Features:

• 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:

• 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 nomenclature for the DURASTAR DRF2TA3624ASTNJB8F air handler series is broken down as follows:

DR	F	2	T	A	36	24	A	S	T	N	J	B	8	F
Brand	Product Category	Stages Of Airflow	Motor Type	Refrigerant	Capacity	Width	Major Series	Efficiency	Metering	Coil Series	Voltage	Disconnect	Factory Heat	Option Code
DR – Durastar	F – Front Return	2 – 2-Stage	T – Constant Torque	A – R-410A	24 – 24,000 [7.03 kW] 36 – 36,000 [10.55 kW]	21 – 21″ 24 – 24.5″	A – 1st Design	S – Standard	T – TXV	N – N Coil	J – 208-240/1/60	B – Breaker N – None	0 – No Heat 3 – 3 kW 5 – 5 kW 8 – 8 kW 1 – 10 kW	F – Float Switch

Return Air Opening Dimensions

Model Cabinet Size	Return Air Opening Width (Inches)	Return Air Opening Depth/Length (Inches)
17	15 7/8	19 3/4
21	19 3/8	19 3/4
24	22 7/8	19 3/4

Unit Dimensions & Weights

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]		Unit Weight/Shipping Weight (Lbs.) [kg]
							Low	High
DRF2TA2421	21 1/2 [546.1]	36 [914.4]	17 [431.8]	20 [508.0]	17 7/16 [442.9]	20 X 20 X 1 [508 X 508 X 25.4]	600 [283]	800 [378]	95 [43] x 105 [48]
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]

For optimum blower performance, operate the DURASTAR DRF2TA3624ASTNJB8F 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 airflow operating limits are as follows:

Airflow Operating Limits

Model Cabinet Size	21	24
Cooling BTUH x 1,000	-24	-36
Cooling Tons Nominal	2	3
Heat Pump or Air Conditioning Maximum Heat/Cool CFM [L/s] (37.5 CFM [18 L/s]/1,000 BTUH) (450 CFM [212 L/s]/Ton Nominal)	900 [425]	1350 [637]
Heat Pump or Air Conditioning Nominal Heat/Cool CFM [L/s] (33.3 CFM [16 L/s]/1,000 BTUH) (400 CFM [189 L/s]/Ton Nominal)	800 [378]	1200 [566]
Heat Pump or Air Conditioning Minimum Heat/Cool CFM [L/s] (30.0 CFM [14 L/s]/1,255 BTUH) (360 CFM [170 L/s]/Ton Nominal)	720 [340]	1080 [510]
Maximum kW Electric Heating & Minimum Electric Heat CFM [L/s]	10 690 [326]	10 976 [461]
Maximum Electric Heat Rise °F [°C]	44 [7]	44 [7]

115V/208V/240V Airflow Performance Data—DRF2TA (Constant Torque (ECM) Motor)

Model/ Nominal Cooling Capacity	Air-Flow Range (Max/Min) CFM	Manufacturer Recommended Blower Size/ Motor HP # of Speeds	Motor Speed From Factory	Motor Speed	CFM Dry Delivery/filter/heaters/RPM/Watts External Static Pressure-Inches W.C.
					0.1	0.2	0.3	0.4	0.5	0.6	0.7
DRF2TA24 1.5 Tons	825/510	10×6 1/3 Hp 2 speed dual voltage	5	2	CFM	537	495	451	404	343	286	252
					RPM	608	656	702	752	826	879	935
					Watts	51.2	54.5	57.6	60.9	65.9	69.5	73.2
				3	CFM	735	702	666	634	600	565	528
					RPM	757	794	836	872	905	942	981
					Watts	99.1	103.2	107.7	112	115.6	119.6	124.1
DRF2TA24 2 Tons	973/733	10×6 1/3 Hp 2 speed dual voltage	5	4	CFM	654	616	581	542	503	463	399
					RPM	694	736	777	818	858	899	971
					Watts	76.4	80.1	83.7	87.6	91.3	95.1	101.6
				5	CFM	887	858	830	802	771	743	717
					RPM	876	914	945	976	1014	1044	1070
					Watts	156	161.8	166.8	171.5	177.5	182.3	186.2
DRF2TA36 2.5 Tons	1145/894	10×8 1/2 Hp 2 speed dual voltage	5	2	CFM	772	698	635	569	497	438	366
					RPM	595	639	698	771	821	866	933
					Watts	82.9	84.9	91.6	100	105.8	110.7	118.3
				3	CFM	1106	1053	1004	962	918	864	814
					RPM	776	816	838	862	901	955	1007
					Watts	183.3	191.4	195.7	200.5	208.4	219.3	230.2
DRF2TA36 3 Tons	1306/1040	10×8 1/2 Hp 2 speed dual voltage	5	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 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 following table details the electrical specifications for the blower motor without an electric heat kit. Blower motors are all single phase motors.

Electrical Data—Blower Motor Only—No Electric Heat

Model/Nominal Cooling Tons	Voltage	Phase	Hertz	HP [W]	RPM	Speeds	Circuit Amps.	Minimum Circuit Ampacity	Maximum Circuit Protector
DRF2TA2421	208/230	1	60	1/3 [249]	300-1100	4	1.9	3	15
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 units with electric heat is as follows:

Electrical Data—with Electric Heat

Cooling Capacity Tons	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
DRF2TA3624	RXHJ-21B/T03J	2.25/3.0	1/60	1-3.0	Single	10.8/12.5	1.9	16/18	20/20
	RXHJ-21B/T05J	3.6/4.8	1/60	1-4.8	Single	17.3/20.0	1.9	0.9	25/30
	RXHJ-21B/T08J	5.4/7.2	1/60	2-3.6	Single	26.0/30.0	1.9	35/40	35/40
	RXHJ-21B/T10J	7.2/9.6	1/60	2-4.8	Single	34.6/40.0	1.9	0.9	50/60
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.

When wiring the DURASTAR DRF2TA3624ASTNJB8F, please adhere to the following 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.

• Supply wiring must be 75°C minimum copper conductors only, in accordance with the National Electrical Code (C.E.C. in Canada) and any applicable local ordinance.

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

• A grounding lug is provided.

The Drain Pan Over Flow Switch RXHK-A01 is an accessory used to detect condensate drain blockage. If a blockage is detected, it will shut down the outdoor unit to prevent structural damage to the surrounding structures of the air handler.

The Bottom Return Conversion Kit is used to divert the return air from the factory standard front return to a bottom return configuration. The correct kit depends on your specific indoor unit model.

Accessory Number	Indoor Unit
RXHK-B01	DRF2TA-FR18
	DRF2TA-FR24
	RF1T-FR24
RXHK-B02	DRF2TA-FR30
	DRF2TA-FR36
	RF1T-FR36

The Louvered Cabinet Grill is a decorative grill accessory that covers the return air opening of the front return air handler. The correct grill depends on your specific indoor unit model.

Accessory Number	Indoor Unit
RXHK-C01	DRF2TA-FR18
	DRF2TA-FR24
	RF1T-FR24
RXHK-C02	DRF2TA-FR30
	DRF2TA-FR36
	RF1T-FR36

The Decorative Wall Grill accessory (RXHK-D01 or RXHK-D02) is used in applications where the air handler is installed in a closet or interior wall. It allows adequate return air back to the unit. Please refer to the installation instructions for the specific grill for complete dimensional information.

Before proceeding with installation, refer to installation instructions packaged with each model, as well as complying with all Federal, State, Provincial, and Local codes, regulations, and practices.