Fujitsu FH**TTT Series High Efficiency Two-Stage EcoNet Enabled Air Handler

Features

• The FH**TTT is EcoNet Enabled, allowing direct communication with the EcoNet Smart Home System.
• Features an Electronic Expansion Valve (EEV).
• Includes a Constant Torque Two-stage motor (ECM) for enhanced SEER performance with most Fujitsu outdoor units.
• Evaporator constructed of aluminum fins bonded to internally grooved aluminum tubing.
• Versatile 4-way convertible design for upflow, downflow, horizontal left, and horizontal right applications.
• Factory-installed indoor coil.
• Sturdy cabinet construction with 1.0 inch [25.4 mm] of foil faced insulation for excellent sound and insulating characteristics.
• Field-installed auxiliary electric heater kits provide exact heat for indoor comfort. Kits include circuit breakers which meet U.L. and cUL requirements for service disconnect.
• 1½ ton [5.3 kW] through 5 ton [17.6 kW] models are between 42½ to 57 inches [1080 to 1448 mm] tall and 22 inches [559 mm] deep.
• All models meet or exceed 330 to 400 CFM [156 to 189 L/s] per ton at .3 inches [.7 kPa] of external static pressure.
• Enhanced airflow up to .7" external static pressure.
• Suitable for application in mobile homes.

Engineering Features

The FH**TTT Series air handler is equipped standard with an EcoNet Air Handler control board, enabling direct communication with the EcoNet Control Center. This Control Center acts as the communication hub for a home's Heating, Cooling, and Water Heating systems, and is essential for operating an EcoNet Enabled Heating and Cooling system in fully communicating mode.

• Selected models feature an Electronic Expansion Valve (EEV) that intelligently adjusts its position based on system demands. By measuring suction pressure via a factory-installed vapor line pressure transducer and a field-connected vapor line thermistor, the EcoNet enabled air handler control calculates indoor coil suction superheat. This calculation allows the air handler control to make decisions for opening and closing the EEV to maintain a predetermined suction superheat. The EEV includes a 4-pole removable external stator and Chatleff fittings for optimal serviceability. These valves also have an internal check valve for heat pump compatibility. In heating mode, the air handler control fully opens the EEV to permit the check valve to operate and maximize reverse refrigerant flow.
• The unit design is highly compact, with all standard heat air handler models measuring only 42½ to 57 inches [1079 to 1448 mm] high.
• Features an attractive pre-painted cabinet exterior.
• Rugged wall steel cabinet construction, designed for added strength and versatility.
• 1.0" foil faced insulation is mechanically retained in the blower compartment for excellent thermal and sound performance.
• Equipped with a four-leg blower motor mount.
• The blower housing, including controls, motor, and blower, features a slide-out design for convenient service and maintenance.
• Traditional open wire element design for heat applications.
• Field convertible for vertical downflow, horizontal left hand, or right hand air supply.
• Three combustible floor base accessories are available to fit all model sizes when required for downflow installations on combustible floors.
• Indoor coil design provides low air side pressure drop, high performance, and extremely compact size.
• Coils are constructed of aluminum fins bonded to internally grooved aluminum tubing.
• Coils are factory tested with an extensive refrigerant leak check.
• Coils have copper sweat refrigerant connections.
• Coils utilize Chatleff metering device connections.
• A molded polymer corrosion resistant condensate drain pan is provided on all indoor coils.
• Supply duct flanges are provided as standard on the air handler cabinet.
• Provisions for field electrical connections are available from either side or the top of the air handler cabinet.
• The connection point for high voltage wiring is inside the air handler cabinet, while low voltage connection is made on the outside.
• Concentric knockouts are provided for power connection to the cabinet. Installers can pull desired hole sizes up to 2 inches [51 mm] for 1½ inch [38 mm] conduit.
• Front refrigerant and drain connections.

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Model Number Identification

The FH**TTT series model numbers are structured to indicate product type, capacity, width, metering device, motor type, speed, voltage, efficiency, and controls. For example, FH2417TTTJMC indicates a Fujitsu Air Handler with 24,000 BTUH capacity, 21 inch width, TEV metering device, Constant Torque motor, Two-Stage speed, 208/230V 1 phase voltage, Medium efficiency, and Communicating controls.

Available TEV Models at J Voltage

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Unit Dimensions

The air handler units are designed with specific return air opening dimensions and overall unit sizes to accommodate various installation requirements. A 24-inch clearance is required in front of the unit for filter and coil maintenance.

Return Air Opening Dimensions

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Unit Diagram Description

The unit diagram illustrates the air handler's external structure and connection points. The unit is shown in an upflow configuration, but is convertible for downflow, horizontal right, or horizontal left air supply. Key features include:

• Electrical Connections: Located at the top or either side. High voltage connections have ⅞" [22.2 mm], 1³⁄₃₂" [27.8 mm], and 1³¹⁄₃₂" [50 mm] diameter knockouts. Low voltage connections have ⅝" [15.9 mm] and ⅞" [22.2 mm] knockouts.
• Supply Air: Located at the top, with a supply air opening of 10⁵⁄₁₆" [262 mm].
• Return Air Opening: Located at the bottom, measuring 19½" [495 mm].
• Overall Depth: 21¹¹⁄₁₆" [551 mm].
• Drain Connections: Primary and auxiliary drain connections are ¾" [19.1 mm] female pipe thread (NPT). Auxiliary drain connections are available for horizontal and upflow/downflow applications.
• Refrigerant Connections: Liquid line and vapor line connections are copper (sweat).

Unit Dimensions & Weights

*Maximum dehumidification airflow.

Indoor Coil and Drain Pan Setup

The indoor coil and drain pan setup shows the internal components and their connections. The coil is secured by straps. Key elements include:

• Horizontal Adapter Kit: Used for horizontal configurations.
• Vapor Line Connection: For refrigerant vapor.
• Auxiliary Horizontal Drain Connection: For horizontal drain.
• Primary Drain Connection: Main drain connection.
• Auxiliary Upflow/Downflow Drain Connection: For vertical drain.
• Liquid Line Connection: For refrigerant liquid.
• Electronic Expansion Valve (EEV): Controls refrigerant flow.
• Top Air Stop: Located at the top of the unit.
• Pressure Transducer: Monitors pressure.
• Electronic Expansion Valve Control: Manages EEV operation.
• Vertical Drain Pan: Collects condensate.
• Detail A: Illustrates the retaining channel fully engaged with the coil rail, ensuring proper seating.

The diagram also includes detailed dimensions for various connection points and overall unit depth, such as 5¹⁵⁄₁₆" [151 mm], 4⅛" [105 mm], 3¹⁄₁₆" [76 mm], 1³⁄₁₆" [48 mm], 1⅛" [29 mm], 1¹⁄₁₆" [27 mm], 1⅜" [35 mm], 2¹³⁄₁₆" [71 mm], 5¼" [133 mm], and 5⅜" [136 mm].

Airflow Directional Data

The FH**TTT series air handlers are designed for versatile installation, supporting four main airflow configurations:

• Upflow: Air enters from the bottom and exits from the top. The unit is oriented vertically with the supply air opening at the top.
• Downflow: Air enters from the top and exits from the bottom. The unit is oriented vertically with the supply air opening at the bottom.
• Horizontal Left Hand Airflow: Air enters from one end and exits horizontally to the left. The unit is oriented horizontally.
• Horizontal Right Hand Airflow: Air enters from one end and exits horizontally to the right. The unit is oriented horizontally.

These configurations allow for flexible integration into various HVAC systems and building layouts.

Airflow Performance

Airflow performance data is based on cooling performance with a coil and no filter in place. To select the appropriate unit size, voltage, and number of electric heaters, refer to the performance tables. Ensure that the external static applied to the unit allows operation within the minimum and maximum limits specified for both cooling and electric heat operation. 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

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208V/240V Airflow Performance Data—FH**TTT (Constant Torque (ECM) Motor)

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208V/240V Airflow Performance Data—FH**TTT (Constant Torque (ECM) Motor) (Continued)

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208V/240V Airflow Performance Data—FH**TTT (Constant Torque (ECM) Motor) (Continued)

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208V/240V Airflow Performance Data—FH**TTT (Constant Torque (ECM) Motor) (Continued)

Notes:

• Constant Torque motor speed changes.
• All Constant Torque motors have 5 speed tabs. Speed tab 1 is for continuous fan. Speed tab 2 (low static) and Speed tab 3 (high static) are for lower tonnage. Speed tab 4 (low static) and Speed tab 5 (high static) are for higher tonnage.
• Constant Torque air handlers are always shipped from factory at Speed tab 5, except for -4824, which is set at Speed tab 3. For instance, (-)H1T-HM2417JA is always shipped at high static 2-ton airflow (Speed tab 5). To change to 1.5-ton airflow, move the blue wire to Speed tab 2 or 3 on the Constant Torque motor.
• The low static Speed tab 2 (lower tonnage) and 4 (higher tonnage) are used for external static below 0.5" WC. The high static Speed tab 3 (lower tonnage) and 5 (higher tonnage) are used for external static exceeding 0.5" WC. Move the blue wire to the appropriate Speed tab as required by the application needs.
• The airflow for continuous fan (Speed tab 1) is always set at 50% of the Speed tab 4.
• The above airflow table lists the airflow information for air handlers without heater and air handler with maximum heater allowed for each model.
• The following formula can be used to calculate the approximate airflow, if a smaller (N KW) than the maximum heater kit is installed: Approximate Airflow = Airflow without heater – (Airflow without heater – Airflow with maximum heater) x (N KW/maximum heater kW)

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Electrical Data

Installation of U.L. Listed original equipment manufacturer provided heater kits is recommended for all auxiliary heating requirements.

Electrical Data – Blower Motor Only – No Electric Heat FH**TTT

* Blower motors are all single phase motors.

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Electrical Data – With Electric Heat FH**TTT

NOTES:

• * Values only. No single point kit available.
• Electric heater BTUH - (heater watts + motor watts) x 3.414 (see airflow table for motor watts.)
• Supply circuit protective devices may be fuses or "HACR" type circuit breakers.
• Largest motor load is included in single circuit and multiple circuit 1.
• Heater loads are balanced on 3 phase heater kits with 3 or 6 heating elements only.
• If non-standard fuse size is specified, use next size larger fuse size.
• J Voltage (230V) single phase air handler is designed to be used with single or three phase 230 volt electric heaters. In the case of connecting 3-phase power to the air handler terminal block without the heater, bring only two leads to the terminal block. Cap, insulate and fully secure the third lead.
• If the kit is listed under both single and multiple circuits, the kit is shipped from factory as multiple circuits. For single phase application, Jumper bar kit RXBJ-A21 and RXBJ-A31 can be used to convert multiple circuits to a single supply circuit. Refer to Accessory Section for details.
• The airflow for continuous fan is set 50% of the cooling airflow.
• ?Heater kits connection type. A=Breaker B=Terminal Block C=Disconnect Pull Out

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Electrical Data – With Electric Heat FH**TTT (Cont.)

NOTES:

• * Values only. No single point kit available.
• Electric heater BTUH - (heater watts + motor watts) x 3.414 (see airflow table for motor watts.)
• Supply circuit protective devices may be fuses or "HACR" type circuit breakers.
• Largest motor load is included in single circuit and multiple circuit 1.
• If non-standard fuse size is specified, use next size larger fuse size.
• J Voltage (230V) single phase air handler is designed to be used with single or three phase 230 volt electric heaters. In the case of connecting 3-phase power to the air handler terminal block without the heater, bring only two leads to the terminal block. Cap, insulate and fully secure the third lead.
• If the kit is listed under both single and multiple circuits, the kit is shipped from factory as multiple circuits. For single phase application, Jumper bar kit RXBJ-A21 and RXBJ-A31 can be used to convert multiple circuits to a single supply circuit. Refer to Accessory Section for details.
• The airflow for continuous fan is set 50% of the cooling airflow.
• ?Heater kits connection type. A=Breaker B=Terminal Block C=Disconnect Pull Out

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Electrical Wiring

Power Wiring

• Field wiring must comply 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.
• See electrical data for product Ampacity rating and Circuit Protector requirement.

Grounding

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

Accessories

Combustible Floor Base RXHB-

Jumper Bar Kits

• Jumper Bar Kit 3 Ckt. to 1 Ckt. RXBJ-A31: Used to convert single phase multiple three circuit units to a single supply circuit. Kit includes cover and screw for line side terminals.
• Jumper Bar Kit 2 Ckt. to 1 Ckt. RXBJ-A21: Used to convert single phase multiple two circuit units to a single supply circuit. Kit includes cover and screw for line side terminals.
• Note: No jumper bar kit is available to convert three phase multiple two circuit units to a single supply circuit.

Auxiliary Horizontal Overflow Pan Accessory RXBM-

Supply and Return Air Sensor Kit RXHT-A02

The RXHT-A02 Thermistor Kit is used with the air handler control to monitor the system return and leaving air temperatures. These temperatures can be monitored with the EcoNet communicating thermostat.

Auxiliary Electric Heater Kits RXBH-

Heater Kits include circuit breakers which meet UL and cUL requirements for service disconnect. Refer to the Electrical Data section in this specification sheet for specific Heater Kit Model numbers.

External Filter Base RXHF-

*Accommodates 1" or 2" filter

Horizontal Adapter Kit RXHH-

This horizontal adapter kit is used to convert Upflow/Downflow only models to horizontal flow. Refer to the following table to order the proper horizontal adapter kit.

External Filter Base RXHF- (Continued)

*Accommodates 1" or 2" filter

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RXHF Diagram Description

The RXHF diagram illustrates the dimensions of the external filter base. It shows the overall length of the flange, which is 19½" [495.30 mm] + 3/30" [1.524 mm] - 3/25" [3.048 mm]. The opening for the filter is 19¹⁸⁄₂₅" [500.888 mm]. The width of the unit is 21" [533 mm].

Limited Warranty

Fujitsu General America, Inc. will furnish a replacement for any part of this product which fails in normal use and service within the applicable periods stated, in accordance with the terms of the limited warranty.

• Conditional Parts (Registration Required): Ten (10) Years

*For complete details of the Limited and Conditional Warranties, including applicable terms and conditions, contact a local contractor or the Manufacturer for a copy of the product warranty certificate.