DX Direct Expansion Room Level Precision Air Conditioner Unit

Note: For products with special technical and functional requirements not shown in the table above, please contact Xinya Air Conditioning to confirm the product model.

Indoor Unit Model Description

Note: For products with special technical and functional requirements not shown in the table above, please contact Xinya Air Conditioning to confirm the product model.

Diverse Forms According to the air delivery method, it can be divided into up-blowing and down-blowing, etc., to meet the requirements of different installation and usage environments. Wide Range of Cooling Capacity Cooling capacity 25kW~110kW, can be freely selected to suit large, medium, and small data centers. Precise Control Temperature accuracy can be controlled within ±1°C, and humidity accuracy can be controlled within ±5%RH. High Energy Efficiency Using high-efficiency scroll compressors, high-efficiency V/IA finned heat exchangers, finely designed liquid distributors, and a more reasonable internal layout, the air flow field inside the air conditioner is more uniform, and the refrigerant distribution is more reasonable, greatly improving the heat exchange efficiency of the heat exchanger, making the air conditioning unit achieve high efficiency and energy saving. Uniform, the refrigerant distribution is more reasonable, thus greatly improving the heat exchange efficiency of the heat exchanger, making the air conditioning unit achieve high efficiency and energy saving effects. Convenient and Durable Unique modular framework, compact structure, small overall size, stable and sturdy yet easy to disassemble, can meet the requirements of handling under extreme conditions Requirement: Using insulation cotton, inside the body Good insulation performance: Single-door and double-door structural components have high versatility, greatly reducing the specifications of wearing parts (such as air filters). Infrared humidification Using advanced infrared humidification technology, effectively reducing the humidifier's dependence on water quality, humidity control is fast and accurate. Environmentally friendly refrigerant Adapting to international requirements for environmentally friendly refrigerants, using R410A environmentally friendly refrigerant. Multiple protection Complete diagnostic and automatic alarm functions, which can more effectively prevent faults from occurring and more quickly locate fault locations, All-round protection The unit effectively extends the service life of the air conditioning unit. Easy to maintain The entire machine adopts a full front opening, and all component maintenance can be performed from the front, saving space.

Indoor unit The indoor unit is mainly composed of compressor, evaporator, expansion valve, fan, sight glass, dryer filter, infrared humidifier, PTC heater, safety control device, air filter, etc. Compressor The compressor uses a high-efficiency scroll compressor (as shown in Figure 1-3), which has the characteristics of small vibration, low noise, and high reliability. Evaporator Using a high-efficiency VIA finned evaporator (as shown in Figure 1-4). The fins are hydrophilic slotted fins, inner threaded copper tubes, and the heat exchange efficiency is higher High. Designed and verified for specific models, appropriate distributors ensure the uniformity of refrigerant distribution in each loop, greatly Improving the efficiency of the heat exchanger.

Outdoor unit
Throttling device Equipped with high-precision electronic expansion valve control (as shown in Figure 1-5), online expert algorithm precisely controls the refrigerant flow, operation More energy-efficient, the system is safer and more stable.
Dryer filter The dryer filter (as shown in Figure 1-7) can effectively remove moisture in the refrigeration system within a period of time, and at the same time filter the system Impurities generated during long-term operation to ensure normal operation of the system.
Fan Using a shell-less centrifugal fan (as shown in Figure 1-6), it has the characteristics of large air volume, long air supply distance, convenient maintenance, high reliability, and no Stepless speed regulation, etc. The advanced fan fault feedback system can automatically judge the reduction of unit air volume caused by abnormal fan operation, And stop the heating or humidification work that is currently running, and issue an alarm signal at the same time.
Infrared humidifier Infrared humidifier (as shown in Figure 1-8) microprocessor control. Simple structure: easy to disassemble: cleaning and maintenance. Hanging on stainless steel The high-strength quartz lamp tube on the humidification water pan emits infrared light and far-infrared light, and within 5~6 seconds, the water in the water pan The water molecules absorb radiation energy to escape the surface tension of the water, evaporate in a pure state, and do not contain any impurities. Infrared The application of humidifiers reduces the system's dependence on water quality, and its automatic flushing function makes the water pan cleaner.
Sight glass A window for system circulation, which can observe the refrigerant state and simultaneously detect the water content of the system. When the system water content exceeds the standard, its The bottom color changes to the alarm area color.
PTC electric heating Using PTC electric heating (as shown in Figure 1-9), it has the advantages of safety, energy saving, rapid heating, and wide range of ambient temperature and voltage Range, etc. Its heat output can maintain the dry-bulb temperature of the machine room while compensating for the temperature caused by dehumidification Drop, the lower surface temperature of the PTC heater can prevent air ionization, thereby extending its service life.
Safety control device Each refrigeration system is equipped with high and low pressure protection and exhaust temperature protection devices. When the compressor's exhaust pressure or exhaust When the temperature is too high, an emergency alarm is issued and protection is performed; when the compressor cannot work normally due to too low suction pressure When the time comes, an alarm signal is issued and protection is performed. Each fan is equipped with a thermal overload protection relay, which can be used when the fan is overloaded Protection in time. The filter clogging switch can monitor the air system of the air conditioning unit in real time.
Air filter Using a standard air filter (as shown in Figure 1-10), it is easy to replace. The filtration efficiency level is G4 (EN779), average The filtration efficiency is over 90%, which effectively ensures the cleanliness of the machine room.

Outdoor unit Throttling device Equipped with high-precision electronic expansion valve control (as shown in Figure 1-5), online expert algorithm precisely controls the refrigerant flow, operation is more energy-efficient, and the system is safer and more stable. Dryer filter The dryer filter (as shown in Figure 1-7) can effectively remove moisture in the refrigeration system within a period of time, and at the same time filter the impurities generated during long-term operation of the system, ensuring the normal operation of the system. Fan Employing a bladeless centrifugal fan (as shown in Figure 1-6), it features high air volume, long air delivery distance, convenient maintenance, high reliability, and stepless speed regulation. An advanced fan fault feedback system can automatically detect reduced unit air volume due to abnormal fan operation, stop ongoing heating or humidification operations, and simultaneously issue an alarm signal. Infrared humidifier The infrared humidifier (as shown in Figure 1-8) is microprocessor-controlled. Its simple structure allows for easy disassembly, cleaning, and maintenance. High-strength quartz tubes suspended above a stainless steel humidification water pan emit infrared and far-infrared light, causing water molecules in the pan to absorb radiant energy and overcome surface tension within 5-6 seconds, evaporating in a pure state without any impurities. The use of an infrared humidifier reduces the system's dependence on water quality, and its automatic flushing function keeps the water pan cleaner. PTC electric heating Using PTC electric heating (as shown in Figure 1-9), it offers advantages such as safety, energy efficiency, rapid heating, and a wide operating temperature and voltage range. Its heat output maintains the room's dry-bulb temperature while compensating for temperature drops during dehumidification. The PTC heater's lower surface temperature prevents air ionization, thus extending its service life. Safety control device Each refrigeration system is equipped with high-pressure, low-pressure, and exhaust temperature protection devices. When the compressor's exhaust pressure or temperature is too high, it issues an emergency alarm and protection; when the compressor cannot operate normally due to excessively low suction pressure, it issues an alarm signal and protection. Each fan is equipped with a thermal overload protection relay for timely protection in case of fan overload. A filter clogging switch allows real-time monitoring of the air conditioning unit's air system. Air-cooled outdoor unit Standard type The corrugated fin-tube heat exchanger boasts high heat dissipation efficiency and convenient cleaning and maintenance. The external rotor axial flow fan, with its unique "sickle" shaped metal blades, offers superior aerodynamic characteristics and high efficiency. Six-pole and eight-pole fans, combined with a specially designed guide vane, significantly reduce airflow noise. A high-performance three-phase motor customized for the base station power grid environment has a wide applicable voltage range and high reliability. The advanced fan speed control system adjusts the output voltage by detecting the system's condensing pressure, thereby controlling the outdoor fan speed to match system pressure with thermal load, effectively reducing fan noise. This ensures stable, reliable, and efficient system operation. A variable frequency speed-controlled outdoor fan is used, supporting a maximum adjustable range of 10%~100%, suitable for configurations in different temperature environments. The energy-saving type (optional) builds upon the standard type. Through unique design, it improves the overall system's energy efficiency ratio, making the entire unit more energy-efficient and efficient, while also meeting high-temperature environments of +45x55℃. Energy-saving type (optional) Based on the standard type, it adds low-temperature components and freeze protection for the electrical control box, allowing the entire system to operate normally at temperatures as low as -40℃. The microprocessor controller is designed to meet the special requirements of the machine room, featuring good stability, high control precision, and intelligence. The indoor unit's front door provides a true color touch screen (LED) operating panel. The simple and easy-to-understand interface displays the current indoor temperature, humidity, set temperature and humidity values, equipment (fan, compressor, cooling, heating, dehumidification, humidification, etc.) output percentage, and alarm status. Users can access and set various set points, event logs, graphical data, sensor data, alarm settings, etc., from the main menu on the display. The LCD backlight uses an energy-saving design. When there is no key operation for a set period (factory default is 5 minutes, configurable via the menu), the backlight turns off; the backlight turns on again when a key operation occurs. The control system also supports multi-unit group control, intelligently realizing expansion, and multiple reserved interfaces can realize various monitoring methods. The microprocessor controller panel is shown in Figure 1-11. Control system The user interface is simple to operate, with multi-level password protection to effectively prevent unauthorized access. The controller has power-off self-recovery and high/low voltage protection functions. Menu operation allows for accurate understanding of the operating time of each major component. An expert-level fault diagnosis system automatically displays the current fault content, facilitating equipment maintenance by maintenance personnel. It can store 400 historical event records, recording messages, warnings, and alarms. It is configured with an RS485 interface, and the communication protocol uses a standard communication protocol. Temperature setting. The temperature setting range is 18°C-32°C. Humidity setting. The humidity setting range is 40%RH~95%RH. Alarm signal. The microprocessor has audible and visual alarm functions. Standard alarm information is as follows: High temperature alarm, low temperature alarm, high humidity alarm, low humidity alarm, system high pressure alarm, system low pressure alarm, filter clogging alarm, other user-defined alarms. Alarm backlight illuminates. The control system also supports multi-unit group control, intelligently realizing expansion, and multiple reserved interfaces can realize various monitoring methods. The microprocessor controller panel is shown in Figure 1-11.

Figure 1-11 Controller Panel

Optional components Top air supply style For top air supply systems, optional matching air supply grilles and diffusers ensure uniform air distribution. Extension components For applications with long connecting pipes, extension components can be used. After the compressor stops, the extension components effectively prevent refrigerant backflow and accumulation, ensuring normal restarting of the compressor for safer and more reliable system operation. Water leakage alarm. Rope-type and single-point water leak detectors can provide alarm signals to the unit or an independent monitoring system, triggering unit alarms and promptly shutting down the unit for timely handling. Smoke detector When the smoke detector detects smoke, it immediately triggers the alarm system to shut down the unit. Fire detector The fire detector monitors the return air temperature of the site. Once high temperatures are encountered, it immediately shuts down the unit. High-efficiency air filter High-efficiency air filters are suitable for use in environments with higher cleanliness requirements. Evaporative humidifier The evaporative humidifier (as shown in Figure 1-12) is a built-in humidifier for air conditioners. It features a simple structure, clean operation, and quiet performance. Using environmentally friendly organic wet-membrane materials, it boasts excellent water absorption, high saturation efficiency, lightweight material, ease of production, small size, space saving, and convenient disassembly, cleaning, and maintenance. Simultaneously, it cleans and filters the air, achieving clean, constant enthalpy humidification. During humidification operation, the wet membrane itself consumes no power, resulting in significant energy savings. Note: Single-cold models do not include heating humidification.

Figure 1-12 Evaporative Humidifier

IV. Technical Parameters of Air-Cooled/Water-Cooled Units

Table 2-1 Technical Parameters of Air-Cooled Units

Note:
Consult Shenxinya air conditioning professionals when using under the following conditions:
1. When the voltage of the air conditioning unit exceeds 10% of the rated voltage or is lower than 90%, the external
pressure exceeds 200Pa.
3. When the altitude exceeds 1000m, derating is required.

Air-cooled outdoor unit

The structural dimensions of the outdoor unit are shown in Figures 3-3 and 3-4.

Table 3-1 SW Series Condenser Mechanical Parameters (Unit: mm)

The appearance and dimensions of the indoor unit (bottom air supply) installation base are shown in Figures 3-5, 3-6 and Table 3-2.

Table 3-2 Installation Base Height Dimensions

Note: The installation base needs to be drilled according to the actual position of the base plate fixing holes, and the hole diameter is φ15mm.

VI. Air Hood Dimensions

For the top air outlet system, an air hood with a grille can be selected according to the requirements. The appearance of the air hood is shown in Figure 3-7, and the specific dimensions are shown in Table 3-3.

Table 3-3 Air Hood Dimensions (Unit: mm)

Note: If the air conditioning unit is equipped with an air hood with a height exceeding 450mm, please contact the manufacturer for non-standard production.

The minimum maintenance space requirements are shown in Table 3-4.

Table 3-4 Minimum Maintenance Space (Unit: mm)

Outdoor unit maintenance space, as shown in Figure 3-9.

Table 3-5 Minimum Maintenance Space (Unit: mm)

Note: These spaces are used for daily maintenance.

2. The pipe sizes suggested in Table 4-2 are equivalent lengths, and the resistance loss caused by elbows and valves has been calculated. Installers should confirm whether it is suitable according to the on-site situation.

3. When the height difference between the indoor and outdoor units is large, install an oil collector (oil storage bend) every 7.5m. For extra-long connecting pipes, sufficient compressor oil needs to be added. Specific information can be consulted with the manufacturer before installation. Maintenance

Note: When the condenser is higher than the compressor, a reverse bend must be installed on the condenser inlet pipe and outlet pipe to prevent liquid backflow when the unit is stopped. When installing the reverse bend, the top of the reverse bend must be higher than the highest row of copper pipes of the condenser.

IX. Refrigerant Piping

Connection

The indoor and outdoor units are connected by welding. Before welding, wrap a wet cloth around the ball valve and pour water to ensure that the ball valve temperature does not exceed 120℃. There are many warning and instruction labels and insulation cotton on the bottom plate and side plates of the air conditioning unit near the ball valve. Do not burn the labels and insulation cotton during welding. The horizontal part of the exhaust pipe should be inclined downwards after being drawn out from the compressor, with a slope of at least 1:200 (5mm drop per 1m). The exhaust pipe should be insulated if it is in a place affected by cooling equipment (including under raised floors). Considering the impact of pipe diameter on system pressure drop, please select the diameter of the connecting copper pipes of the indoor and outdoor units according to the recommended sizes in Table 4-3 as much as possible.

Table 4-3 Recommended Pipe Size Reference

General Principles
Indoor units can be divided into top-blowing and bottom-blowing according to the air outlet method. For the connection of the air-cooled system, air ducts can be connected or an air cap (for top-blowing) can be selected. Comprehensive consideration is needed when connecting air ducts.
Please refer to the following principles when installing air ducts:
● The ratio of the long side to the short side of the rectangular duct should not be greater than 4:1.
● For bending rectangular ducts, inner arc or inner oblique rectangular bends can be used. When the side length is greater than or equal to 500mm, flow guides should be set.
● When the side length of the rectangular duct is greater than or equal to 630mm, the side length of the insulated duct is greater than or equal to 800mm, and the length of the pipe section is greater than 1200mm, reinforcement measures should be adopted.
● The surface of the duct and accessories should be smooth, the arc should be uniform, and the bite seam should be tight. Moreover, the detachable interfaces and adjusting mechanisms of the duct and accessories should not be installed on the wall
or in the floor slab.
· The airtightness test of the air duct should meet the light leakage test standard.
Pay special attention when connecting air ducts: When multiple air conditioning units are connected to the same static pressure box, the interference of air flow between air conditioning units should be avoided or reduced as much as possible.
★Bottom air supply units are recommended for free return air, and return air ducts are not recommended. If a return air duct must be installed, please install a static pressure box above the unit, and the height of the static pressure box should not be less than 600mm. Using "elbows" or "reducers" as substitutes is prohibited.
Piping

Controller Connection

The following monitoring and alarm devices can be connected:
1. Remote shutdown. The unit reserves a passive signal interface for remote shutdown. This signal should be disconnected normally. When remote shutdown is required, please close this passive signal. After the remote shutdown signal is closed, the unit will shut down and generate a remote shutdown alarm. Refer to the electrical schematic diagram and installation instructions included in the package for connection.
2. Smoke alarm. The unit reserves a passive signal interface for smoke alarm. This signal should be disconnected normally. When the smoke alarm signal is closed, the unit will shut down and generate a smoke alarm. Refer to the electrical schematic diagram and installation instructions included in the package for connection.
3. Monitoring system. The unit reserves an RS485 interface and supports the MODBUS-RTU protocol.
4. Alarm signal output. When any alarm occurs in the unit, the unit alarm output signal is closed, otherwise it is disconnected. The unit alarm output signal is a passive contact signal. Refer to the electrical schematic diagram and installation instructions included in the package for connection.
Multi-unit Group Control
Multiple units can be interconnected to achieve group control and main-backup rotation functions. Multi-unit interconnection is achieved through the CAN bus, with a maximum of 32 units. Unit 1 (address 0) is the default master control unit, and other units are set to addresses 1-31 respectively. If the master control unit communication or networking fails, each unit will operate independently. The master control unit sends control commands to each unit and reads measurement data and unit status from the slave units.
Multi-unit group control can achieve the following functions:
1. Module 1: The host compares the average controlled temperature and humidity value of all running units with the host's controlled temperature and humidity set value to calculate the direction of the room temperature and humidity demand. The units in the group control network operate according to the direction of the room temperature and humidity demand. Standby, time rotation, fault rotation, and cascading functions are allowed.
2. Module 2: The units in the group control network compare their own detected controlled temperature and humidity values with the host's controlled temperature and humidity set values to determine the output direction and intensity. Standby, time rotation, fault rotation, and cascading functions are allowed.
1、模块一主机根据所有运行机组的平均被控温湿度值与主机被控温湿度设定值进行比较计算出机房温湿度需求方向，群控网络中的机组按照机房温湿度需求方向运行工作。允许备用、时间轮值、故障轮值、层叠功能。
2、模块二：群控网络中的机组根据自身检测的被控温湿度值与主机被控温湿度设定值进行比较，确定输出方向和输出力度。允许备用、时间轮值、故障轮值、层叠功能。