Screw chiller/heat pump unit

1. The static pressure of the above indoor unit's air outlet is: top supply air 50Pa, bottom supply air 20Pa. Models up to 200Pa can be customized.
2. The parameters in this table are for standard outdoor units at normal temperature.
3. If the required data is not listed in the table, please contact Xinya Air Conditioning.
4. Depending on project conditions, it supports separate power distribution for indoor and outdoor units, and also supports outdoor unit power being drawn from the indoor unit.

Note: When using under the following circumstances, please consult with a Shen Xinya Air Conditioning professional technician: 1. If the air source unit voltage exceeds 10% of the rated voltage or is lower than 90%, and the external residual pressure exceeds 200Pa.
3. When the altitude exceeds 1000m, derated operation is required.

V. Structural Dimensions
Indoor Unit
The structural dimensions of the indoor unit are shown in Figures 3-1 and 3-2.

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

For top air discharge systems, an air supply hood with a grille can be selected as required. The shape of the air hood is shown in Figure 3-7, and specific dimensions refer to Table 3-3.

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

VIII. Refrigerant Piping
General Principles
Air-cooled systems require the connection of refrigerant piping between the indoor and outdoor units. Typically, installers need to confirm the equivalent length of the refrigerant piping based on site conditions to determine the connection method. The equivalent length of the piping should consider the resistance caused by various fittings. Please refer to the following principles: 1. If the single-pass equivalent length exceeds 30m, or the vertical height difference between the indoor and outdoor units exceeds 7.5m, please consult the manufacturer before installation to confirm whether pipe extension components or other measures are required.
2. The recommended pipe dimensions in Table 4-2 are equivalent lengths, with resistance losses from elbows and valves already calculated. Installers should confirm suitability based on site conditions.
3. When there is a significant height difference between the indoor and outdoor units, install an oil trap (oil reservoir) every 7.5m. Overly long connecting pipes require sufficient compressor oil replenishment. For details, please consult the manufacturer before installation.

Piping Layout
During installation, piping can be laid out by referring to Figures 4-1 and 4-2.

IX. Refrigerant Piping
Piping
Indoor and outdoor units are connected by welding. Before welding, wrap the ball valve with a cloth and pour water over it to ensure the ball valve temperature does not exceed 120°C. There are many warning and instruction labels and moisture-proof cotton on the bottom plate and side plates of the air conditioner 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 led 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 affected by cooling equipment (including under the floor). Considering the influence of pipe diameter on system pressure drop, please select the diameter of the connecting copper pipe of indoor and outdoor units according to the construction dimensions in Table 4-3 as much as possible.

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 air hoods can be selected (for top-blowing). 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 air duct should not be greater than 4:1.
For bending rectangular air 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 air duct is greater than or equal to 630mm, the insulated air duct side length is greater than or equal to 800mm, and the pipe section length is greater than 1200mm, additional support should be adopted.
The surface of the air duct and accessories should be smooth, the arc should be uniform, the bite seam should be tight, and the detachable interface and adjusting mechanism of the air duct and accessories should not be installed on the top or in the floor.
The airtightness test of the air duct should meet the leakage light test standard.

Piping Layout
Pay special attention when connecting air ducts: When multiple air conditioning units share the same static pressure box, the mutual interference of airflows from the air conditioning units should be avoided or reduced as much as possible.
Bottom-blowing units are recommended for free return air and are not recommended for return air ducts. 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. Do not use "odd heads" or "reduced mouths" to replace the static pressure box, otherwise it will cause the unit to alarm.

X. Electrical and Control
Main Circuit Connection
Power requirements for the newly launched DX series air conditioners:
Indoor unit uses 3N+PE-380, 50Hz; outdoor unit uses 3+PE-380, 50Hz. Refer to the nameplate of the air conditioning unit for the specific current. The wire diameter should be determined by considering the full-load current and the influence of the working environment. All electrical wiring should comply with local standards, and check that the power supply is consistent with the nameplate requirements. To avoid corrosion and overheating at the terminal connections, all power supply wires must be copper wires. The power connection diagram is shown in Figure 4-4:
Customer Power Connection (Single-phase power supply for indoor unit, outdoor unit powered by indoor unit)

Customer Power Connection (Outdoor unit with separate power supply)

XI. Application Guide
Controller Connection
The new standard DX series air conditioners provide a dedicated terminal block, mainly providing external interfaces for remote control, alarm monitoring, etc. Users can connect the following monitoring and alarm devices:
1. Remote shutdown. The unit is equipped with a passive signal interface for remote shutdown. This signal should be disconnected normally. To remotely shut down, please close this passive signal. When 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 is equipped with 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. Blue control system. The unit is equipped with an RS485 interface and supports MODBUS-RTU protocol.
4. Alarm signal output. When the unit encounters any alarm, the unit alarm output signal is closed; otherwise, it is open. 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 linked for group control and main/backup rotation. Multi-unit linkage is achieved through 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 fails to communicate or the network fails, each unit will operate independently. The master control unit sends control commands to each unit and obtains 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 humidity value of all operating units with the host's controlled humidity set value to calculate the direction of the room humidity demand. The units in the group control network operate according to the direction of the room 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 humidity value with the host's controlled humidity set value to determine the output direction and intensity. Standby, time rotation, fault rotation, and cascading functions are allowed.

I. Product Introduction

The new Ya DST series screw air conditioning units are divided into four series: screw-type water-cooled chillers, screw-type water-source heat pump units, screw-type air-cooled chillers, and screw-type air-cooled heat pump units.
II. Product Features
High Efficiency and Energy Saving
With the production capacity of major components and independent intellectual property rights, the system is perfectly matched, and the overall efficiency reaches 6.0. The unit can be optionally equipped with the company's independently patented heat recovery device, which can recover more than 30% of the cooling capacity under air conditioning conditions or achieve full heat recovery. The maximum hot water temperature can reach 70°C. Heat recovery does not consume electricity, and the overall efficiency of the unit can be increased by 5%.
Reliable Operation
The unit has seven safety protection measures to ensure normal operation. The unit is available in single and dual-circuit designs to meet different customer needs. When a single compressor in a dual-circuit unit fails, the other compressor can still operate normally, minimizing the impact of the failure. All units undergo 100% safety testing before leaving the factory to ensure that the unit's performance meets company standards.
Intelligent Control
The unit uses microcomputer control and can be operated through a centralized management system. The unit can be optionally equipped with a remote management program to feedback system operation information and enable remote service. The control interface directly displays the fault content, facilitating timely understanding and troubleshooting of faults.
Easy Installation and Maintenance
The unit is pre-charged with refrigerant and lubricating oil at the factory. Customers only need to connect the water inlet and outlet pipes and the power supply to operate.

The screw-type water-cooled chiller uses a high-efficiency twin-screw compressor, matched with a high-efficiency condenser and evaporator produced by our factory, and a brand expansion valve. Application range of the unit: various air-conditioning and heating in large, medium, and small commercial places. Cooling capacity range: 70KW-5000KW.

A variety of refrigerants are available. The unit can provide refrigerants such as R22 and R134a. The chilled water outlet temperature range is 5-20 degrees. 380V-50HZ-3N and other power systems are available. Modular design allows for flexible combinations.

The screw-type water-source heat pump unit uses a twin-screw compressor. The water-source heat pump system can provide heating and cooling, making it versatile. One system can replace the original boiler and air conditioning systems, saving a significant amount of energy and reducing initial equipment investment.