DX Kit for Single Split Outdoor Unit

DESIGN & TECHNICAL MANUAL

Model Name: UTY-XDZX

Manufacturer: Fuji Electric

Document ID: DR_OP008EJ_03

Date: 2020.10.16

Notices

Product specifications and design are subject to change without notice for future improvement.
For further details, please check with an authorized dealer.

1. Precautions

This manual provides guidelines for Air Handling Unit (AHU) design and notices for the use of the DX kit for single split outdoor units.
This product allows AHUs from other manufacturers to be integrated with Fujitsu General split-type outdoor units. Consult this manual for guidelines when implementing this product with third-party AHUs.
Refer to the installation manuals of this product and the outdoor unit for correct use and installation.

CAUTION

Ensure conformity with all applicable regulations and laws for the entire system (including the outdoor unit).
R32 is a mildly flammable refrigerant. Consult IEC 60335 and IEC 60335-2-40 (Edition 6.0). Fire safety warranty for the entire system (including the outdoor unit) must be handled by the user when using R32 refrigerant.
For safety, always read the outdoor unit's installation manual, especially when using R32 refrigerant.
Fujitsu General Limited is not responsible for system design at the field or failures caused by field system design, including issues with their outdoor units.

2. Model Lineup

2-1. Applicable Outdoor Units

CAUTION: Incorrect selection of the outdoor unit or refrigerant can cause damage and operational issues. Verify the connecting outdoor unit model and select the appropriate unit type.

R410A Refrigerant

Model Code (kBtu/h)	kW	R410A Model Name
09 (2.5)	--	ROG09KBTB
12 (3.5)	ROG12LBLA	ROG12KBTB
14 (4.3)	ROG14LBLA	ROG14KBTB
18 (5.2)	ROG18LBCA	ROG18KBTB
22 (6.0)	--	ROG22KBTB
24 (6.8)	ROG24LBCA	ROG24KBTB
30 (8.5)	ROG30LBTA	ROG30KBTB
36 (9.4)	ROG36LBTA	ROG36KBTB
	ROG36LATT (3 Ø)
45 (12.1)	ROG45LBTA	ROG45KBTB
	ROG45LATT (3 Ø)
54 (13.3)	ROG54LBTA	ROG54KBTB
	ROG54LATT (3 Ø)
60 (15.0)	ROG60LATT (3 Ø)	--
72 (19.0)	ROG72LRLA (3 Ø)	--
90 (22.0)	ROG90LRLA (3 Ø)	--

R32 Refrigerant

Model Code (kBtu/h)	kW	R410A Model Name
09 (2.5)	ROG09KBTB	--
12 (3.5)	ROG12KBTB	--
14 (4.3)	ROG14KBTB	--
18 (5.2)	ROG18KBTB	--
22 (6.0)	ROG22KBTB	--
24 (6.8)	ROG24KBTB	--
30 (8.5)	ROG30KBTB	--
36 (9.4)	ROG36KBTB	--
45 (12.1)	ROG45KBTB	--
54 (13.3)	ROG54KBTB	--

RELATED LINKS: 1. Precautions on page 2

2-2. Applicable Air Handling Units

NOTES: Specifications are based on the following conditions:

Cooling: Indoor temperature of 27°CDB/19°CWB and outdoor temperature of 35°CDB/24°CWB
Heating: Indoor temperature of 20°CDB/15°CWB and outdoor temperature of 7°CDB/6°CWB
Pipe length: 5.0 m
Voltage: 230 V
Ensure AHU heat exchange capacity and airflow meet system design requirements when using third-party AHUs. Capacities are not guaranteed.
For other heat exchanger requirements, refer to "Important notices" on page 1.
For detailed outdoor unit specifications, refer to the "DESIGN & TECHNICAL MANUAL" of the outdoor unit.

Refrigerant type: R410A

Connected outdoor unit model name	Capacity (Nominal)		Specification	Connection pipe	Applicable AHU requirement
Connected outdoor unit model name	Cooling kW	Heating kW	Specification	Connection pipe	Applicable AHU requirement
ROG12LBLA	3.5	4.1	Size (Liquid/Gas): Ø6.35 (1/4") / Ø9.52 (3/8") Pre-charge length: 15 m Max. length: 25 m Max. height difference: 15 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 746/746 cm³ Airflow volume (Min/Max): 510/850 m³/h
ROG14LBLA	4.3	5.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø9.52 (3/8") Pre-charge length: 15 m Max. length: 25 m Max. height difference: 15 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 746/746 cm³ Airflow volume (Min/Max): 570/950 m³/h
ROG18LBCA	5.2	6.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø12.70 (1/2") Pre-charge length: 15 m Max. length: 30 m Max. height difference: 20 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 1,370/1,480 cm³ Airflow volume (Min/Max): 780/1,050 m³/h
ROG24LBCA	6.8	7.8	Size (Liquid/Gas): Ø6.35 (1/4") / Ø15.88 (5/8") Pre-charge length: 20 m Max. length: 30 m Max. height difference: 20 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 1,370/1,480 cm³ Airflow volume (Min/Max): 870/1,150 m³/h
ROG30LBTA	8.5	10.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø15.88 (5/8") Pre-charge length: 20 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,490/1,630 cm³ Airflow volume (Min/Max): 1,070/1,600 m³/h
ROG36LBTA	9.4	10.8	Size (Liquid/Gas): Ø6.35 (1/4") / Ø15.88 (5/8") Pre-charge length: 20 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,640/2,260 cm³ Airflow volume (Min/Max): 1,180/1,560 m³/h
ROG36LATT (3 Ø)	9.4	10.8	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 75 m Max. height difference: 30 m Additional charge amount: 50 g/m	Heat exchanger capacity (Min/Max): 1,370/1,870 cm³ Airflow volume (Min/Max): 970/1,360 m³/h
ROG45LBTA	12.1	13.3	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 75 m Max. height difference: 30 m Additional charge amount: 50 g/m	Heat exchanger capacity (Min/Max): 2,270/2,730 cm³ Airflow volume (Min/Max): 1,430/1,960 m³/h
ROG45LATT (3 Ø)	12.1	13.3	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 75 m Max. height difference: 30 m Additional charge amount: 50 g/m	Heat exchanger capacity (Min/Max): 1,590/2,730 cm³ Airflow volume (Min/Max): 1,100/1,860 m³/h
ROG54LBTA	13.3	15.8	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 20 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 2,270/2,810 cm³ Airflow volume (Min/Max): 1,430/1,960 m³/h
ROG54LATT (3 Ø)	13.3	15.8	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 20 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,940/2,810 cm³ Airflow volume (Min/Max): 1,300/1,860 m³/h
ROG60LATT (3 Ø)	15.0	18.0	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 75 m Max. height difference: 30 m Additional charge amount: 50 g/m	Heat exchanger capacity (Min/Max): 2,556/2,556 cm³ Airflow volume (Min/Max): 2,450/3,550 m³/h
ROG72LRLA (3 Ø)	19.0	22.4	Size (Liquid/Gas): Ø12.70 (1/2") / Ø25.40 (1") Pre-charge length: 30 m Max. length: 100 m Max. height difference: 30 m Additional charge amount: 110 g/m	Heat exchanger capacity (Min/Max): 3,170/4,100 cm³ Airflow volume (Min/Max): 2,200/2,720 m³/h
ROG90LRLA (3 Ø)	22.0	27.0	Size (Liquid/Gas): Ø12.70 (1/2") / Ø25.40 (1") Pre-charge length: 30 m Max. length: 100 m Max. height difference: 30 m Additional charge amount: 110 g/m	Heat exchanger capacity (Min/Max): 3,170/5,470 cm³ Airflow volume (Min/Max): 2,200/3,720 m³/h

Refrigerant type: R32

Connected outdoor unit model name	Capacity (Nominal)		Specification	Connection pipe	Applicable AHU requirement
Connected outdoor unit model name	Cooling kW	Heating kW	Specification	Connection pipe	Applicable AHU requirement
ROG09KBTB	2.5	3.2	Size (Liquid/Gas): Ø6.35 (1/4") / Ø9.52 (3/8") Pre-charge length: 15 m Max. length: 20 m Max. height difference: 15 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 670/680 cm³ Airflow volume (Min/Max): 390/540 m³/h
ROG12KBTB	3.5	4.1	Size (Liquid/Gas): Ø6.35 (1/4") / Ø9.52 (3/8") Pre-charge length: 15 m Max. length: 25 m Max. height difference: 20 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 670/740 cm³ Airflow volume (Min/Max): 410/600 m³/h
ROG14KBTB	4.3	5.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø9.52 (3/8") Pre-charge length: 15 m Max. length: 25 m Max. height difference: 20 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 690/830 cm³ Airflow volume (Min/Max): 480/680 m³/h
ROG18KBTB	5.2	6.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø12.70 (1/2") Pre-charge length: 20 m Max. length: 30 m Max. height difference: 20 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 960/1,480 cm³ Airflow volume (Min/Max): 750/830 m³/h
ROG22KBTB	6.0	7.0	Size (Liquid/Gas): Ø6.35 (1/4") / Ø12.70 (1/2") Pre-charge length: 20 m Max. length: 30 m Max. height difference: 25 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 1,270/1,480 cm³ Airflow volume (Min/Max): 530/830 m³/h
ROG24KBTB	6.8	7.5	Size (Liquid/Gas): Ø6.35 (1/4") / Ø12.70 (1/2") Pre-charge length: 20 m Max. length: 30 m Max. height difference: 25 m Additional charge amount: 20 g/m	Heat exchanger capacity (Min/Max): 1,270/1,480 cm³ Airflow volume (Min/Max): 530/930 m³/h
ROG30KBTB	8.5	10.0	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,370/1,630 cm³ Airflow volume (Min/Max): 980/1,600 m³/h
ROG36KBTB	9.4	10.8	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,370/2,260 cm³ Airflow volume (Min/Max): 980/1,870 m³/h
ROG45KBTB	12.1	13.3	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 1,830/2,420 cm³ Airflow volume (Min/Max): 1,070/1,850 m³/h
ROG54KBTB	13.3	15.8	Size (Liquid/Gas): Ø9.52 (3/8") / Ø15.88 (5/8") Pre-charge length: 30 m Max. length: 50 m Max. height difference: 30 m Additional charge amount: 40 g/m	Heat exchanger capacity (Min/Max): 2,270/2,420 cm³ Airflow volume (Min/Max): 1,430/2,100 m³/h

2-3. Important Notices

Read the conditions described in this section carefully and design appropriately to avoid AHU failure when incorporating this product into the system.

Requirements for using R32 refrigerant

For disabling compressor operation during fire safety measures (e.g., refrigerant leakage), refer to "External input and output" on page 16.
Satisfy requirements for charge limits and ventilation (IEC 60335-2-40 Annex GG).
Satisfy requirements for marking (e.g., flame symbol) and regulatory information.
Satisfy requirements for construction, including the location of the refrigerant detection sensor.

Temperature sensor of AHU heat exchanger (locally purchased) installation requirements

A temperature sensor for the AHU heat exchanger (locally purchased) is necessary for controlling the outdoor unit operation.
NTC Temperature Sensor Type: R25: 10 kΩ (±1%), B25/85: 3950 K (3900 K—4000 K).
Cover the full sensor length with suitable insulation material to prevent ambient air temperature from affecting readings.
The recommended sensor cable length is 2 m. For longer cables, use appropriate wire types, such as noise shield wire. Longer cables are permissible if precautions are taken to avoid electrical noise interference. A 15 m cable is generally acceptable if shielded.
Avoid ground loops in the shield.
Placement of the temperature sensor: Optimal placement depends on system use. Install to securely detect condensation and evaporation temperatures. For DX coils with cooling and heating, place it near the middle of the inlet and outlet pipe. For cooling-only systems, place it on the coldest part of the evaporator or midway along the inlet/outlet pipe.
Installing the temperature sensor: Ensure good thermal contact with the sensed pipe and fasten securely using zip ties, aluminum tape, or equivalent. Protect the sensor with heat insulating materials. Route the sensor wire carefully, avoiding stress or submersion. Install where it will not be exposed to condensed water or submerged. Ensure sufficient contact area with the piping for accurate detection. Avoid direct sunlight.

AHU heat exchanger requirements in field system design

AHU heat exchanger pipes must meet the following conditions: Clean inside, free from oil, moisture, cutting chips; no chlorine; water content ≤ 20 mg; oil content ≤ 1 mg/m; foreign substance ≤ 15 mg.
Soldering must be performed under a protective gas atmosphere.
Pipes must be free from dents or deformation.
Pipe contraction sections should be smooth, without significant corrugation or burrs.
Use only non-discolored or undeformed copper tubes.
When designing with third-party AHUs, ensure heat exchangers meet the following withstand pressures: Outdoor unit design pressure: 4.15 MPa; AHU burst pressure: 12.45 MPa.
Maintenance: Keep the heat exchanger clean. Rinse thoroughly to remove flux. Do not use chlorinated detergents for cleaning.

Cooling operation requirements

Supply air (inlet) temperature range for cooling mode is 18°C to 32°C. Outside this range, supply air temperature is not guaranteed.
If the temperature around the AHU heat exchanger air inlet drops below 18°C, icing may occur.
If the AHU heat exchanger evaporation temperature drops below 4°C, stop compressor operation via the AHU controller. Operating below 4°C may cause failure.
If the heat exchanger pipe temperature does not drop below the ambient air inlet temperature for over 20 minutes during continuous operation, stop compressor operation as the outdoor unit's 4-way valve may be failing.

Heating operation requirements

Supply air (inlet) temperature range for heating mode is 10°C to 30°C. Outside this range, supply air temperature is not guaranteed.
Stop operation if the heat exchanger pipe temperature does not rise above the ambient air temperature after 20 minutes of continuous operation, as this may indicate an outdoor unit failure.
Operating at temperatures lower than specified may cause compressor malfunction. If the ambient air inlet temperature is lower than specified, frequent defrosting operations may occur.

3. Overview

Circuit Diagram

The circuit diagram illustrates the connections for the DX kit. It includes inputs for power (DC 24 V), Enable, Cool/Heat, GND, and Demand (0-10 V for 0-100% compressor demand). It also shows connections for a temperature sensor of the AHU heat exchanger (locally purchased). The diagram features a setup switch, reset switch, and LEDs (RGB, Red, Green). An outdoor unit terminal block example is shown, with connections to terminals 1, 2, 3, and 4 for Common, Compressor, Defrosting, and Error outputs respectively.

System Diagram Example

The system diagram depicts a Fujitsu General split-type outdoor unit connected to an "Other manufacturer's AHU" via the DX KIT. The connection involves wiring and piping. The diagram indicates connections for Enable, Cool/Heat, DC 24 V power, GND, Demand (0-10 V), and a temperature sensor for the AHU heat exchanger.

3-1. Wireless LAN Control

By registering a user account on EcoSmart.cloud, various functions can be controlled remotely. Refer to EcoSmart.cloud for user account registration and network setting details.

CAUTION: To prevent personal injury, property damage, or product malfunction, carefully read the product's installation manual and adhere to all safety precautions.

System Requirement

Before using the Wireless LAN control function, prepare the following:

Wireless router:
Wireless LAN standard: IEEE802.11b/g/n
Frequency bands*: 2.400 to 2.484 GHz (1ch—14ch)
Network security: Supported to provide the latest security requirements on your network. Includes Hardware WAPI acceleration engine, AES, TKIP, WPA, WPA2.

*Usable only in the country or region where the product was purchased. Refer to the installation manual to verify wireless router compliance with the listed network security technologies or standards.

Output Power

Characteristics	Type	Criteria	Unit
RF average output power, 802.11b CCK mode	1M	±1.5	dBm
	11M	±1.5	dBm
RF average output power, 802.11g OFDM mode	6M	±1.5	dBm
	54M	±1.5	dBm
RF average output power, 802.11n OFDM mode	MCS0	±1.5	dBm
	MCS7	±1.5	dBm

4. Specifications

Item	Unit	Specification
Power supply		230 V ~ 50 Hz
Maximum input power	W	2
Maximum operating current	A	0.01
Dimensions (H x W x D)	mm	90.2 x 53.3 x 57.5
Weight	g	110 (Net) / 150 (Gross)
Dry bulb temperature of installed environmental	°C	-20 to 46 (Operating)
Degree of protection		IP10

5. Dimensions

Unit: mm

Top view: Width: 53.3 mm, Height: 90.2 mm.

Side view: Width: 57.5 mm, Height: 61.6 mm. Section A-A shows internal dimensions. Base depth: 27.5 mm.

6. Electrical Characteristics

Wiring spec.	Circuit breaker current	Connection cable
	Cross-sectional area (mm²)	Limited wiring length (m)	Type
	Depending on connected outdoor unit	2.5 (Maximum)	Refer to Max. length of connection pipe in "Applicable air handling units" on page 5. Use confirmed cable with type 60245 IEC57.

*1: Regulations for wire size and circuit breaker vary by country/region; select appropriate devices compliant with regional standards.

*2: Limit voltage drop to less than 2%. Increase conductor size if voltage drop is 2% or more.

NOTE: Connect the ground to the external ground properly.

7. External Input and Output

NOTES:

Use suitable isolated wires of 0.25 to 0.5 mm².
For noisy environments or wire lengths exceeding 2 m, a twisted pair shielded cable (0.25 to 0.5 mm²) is recommended.
For high impedance inputs, keep wire connections separate from the power cable.

External Input

Input name	Terminal No.
Cool/Heat	6-7
Enable	5-7
Demand	3, 4
Temperature sensor	1, 2

External Output

Output name	Terminal No.
Compressor running	3-4
Defrosting	2-4
Error	1-4

7-1. Terminal Layout

The terminal layout shows connections for DC 24 V power supply, Enable, Cool/Heat, GND, Demand (0-10 V for 0-100% compressor demand), and a temperature sensor for the AHU heat exchanger (locally purchased). The diagram also indicates connections to a common terminal, compressor, defrosting, and error indicators via terminals 1, 2, 3, and 4.

7-2. External Input

The unit features a galvanically isolated internal power source. The required control signals are:

Enable: Short: Demand input is available. Open: Demand input is not available; compressor does not work.
Cool/Heat: Short: Heating mode is set. Open: Cooling mode is set.
Demand: DC 0-10 V for 0-100% compressor demand. 0 V: Compressor off.

All these signals must be either potential-free or refer to a common potential.

Cool/Heat, Enable inputs

Diagram shows external device connections for Cool/Heat and Enable inputs to terminals 6 and 5 respectively, with DC power supply on terminal 7.

Demand input

Diagram shows a graph of output voltage vs. compressor demand percentage. Demand input is connected to terminals 3 (Input) and 4 (GND).

Temperature sensor of AHU heat exchanger input

Diagram shows temperature sensor connected to terminals 1 and 2 (GND).

7-3. External Output

The external outputs are 3 potential-free relays with a common supply. Total rating is 3 A, AC 250 V or DC 30 V resistive load.

Diagram shows connections for Connected device 1, 2, and 3 to the DX kit's Common (terminal 4), Compressor (terminal 3), Defrosting (terminal 2), and Error (terminal 1) outputs, powered by DC 24V.

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