INSTALLATION & OWNER’S MANUAL SYSVRF2 AHU BOX IMPORTANT NOTE: Original instructions Thank you very much for purchasing our air conditioner. Before using your air conditioner, please read this manual carefully and keep it for future reference. The figure shown in this manual is for reference only and may be slightly different from the actual product.
CONTENTS 1 PRECAUTIONS 01 2 INTRODUCTION 02 3 INSTALLATION 3.1 3.2 3.3 3.4 3.5 3.6 Before Installation Choosing an Installation Site Installation Methods and Size Refrigerant Piping Temperature Sensor Installation Electrical Connection 04 05 05 07 09 10 4 FUNCTION SETTINGS 4.1 4.2 4.3 4.4 4.
1 PRECAUTIONS The appliance must be positioned so that the plug is accessible. Be sure to conform to local, national, and international laws and regulations. The enclosure of the appliance shall be marked with words or symbols, and indicate the direction of the fluid flow. Read "PRECAUTIONS" carefully before installation. For electrical work, follow the local national wiring standards, regulations and these installation instructions. An independent circuit and single outlet must be used.
2 INTRODUCTION CAUTION Ground the air conditioner. The AHU control box can be connected to the heat pump/heat recovery ODU and the third party AHU. Every third party AHU can be connected to one AHU control box or to several AHU control boxes in a parallel connection (up to four). This manual describes how to install and operate an AHU control box. Do not connect the ground wire to gas or water pipes, lightning rods or a telephone ground wire. Incomplete grounding may result in electrical shock.
3 INSTALLATION Accessories NAME SHAPE 1 Wired controller 1 Electronic expansion valve adapter cable group 1 Fixed clamp of temperature sensor 3 Sleeve 3 Screw ST3.9x25 8 Plastic expanded tube 8 TA T1 T2BT2 T2A Installation & owner׳s manual Temp.sensor connecting wire group Wired controller Secure the installation board 5 TA T1 T2BT2 T2A Temp.sensor USE QUANTITY 5 5 Tie wrap Installation layout 1 3 2 8 5 Table 3-2 Names and functions No.
3.1 Before Installation Table 3-3 Setting Model An AHU control box can be connected to a heat pump ODU or a heat recovery ODU. Cooling Capacity (HP) When an AHU control box is connected to a heat recovery ODU, the system is not allowed to connect to AHU only. The IDU/ODU capacity ratio of common IDUs should be 50%-100%, that of the AHU control box should be 0%-50%, and that of the entire system should be 50%-100%.
Perform checks upon completion of installation, and pay extra attention to the following items: CAUTION Do not install or operate AHU control boxes in the following indoor environments: Places with fossil fuels (such as kitchens containing oil or natural gas) Whether the temperature sensor is properly installed. Whether AHU control boxes are properly secured. Whether electrical connections meet specifications.
R6 R3 344.2 Install vertically 58.5 15 308.2 360 392.
3.4 Refrigerant Piping How to remove EEV from the AHU control box. The EEV may be removed from the AHU control box and positioned in an external location. Follow these steps to remove the EEV from the box. 3.4.1 Material and Size of the Piping Only seamless phosphorus-deoxidized copper piping that complies with all applicable laws should be used. Temper grades and minimum thicknesses for different diameters of piping are specified in Table 3-5. Table 3-5 Piping Outer Diameter (mm) Temper Min.
2. When performing welding, use the pressure relief damper to keep the nitrogen pressure in the pipe at the range of 0.02-0.03 Mpa (as if the air is blowing gently on the skin). 1 2 3 4 NOTE When welding pipes at the AHU control box, the valve body and filter should be cooled with a wet cloth to prevent damage to the EEV due to excessively high temperatures. 5 4. After the pipes are installed, insulate the pipes. 6 5.
3.4.7 Example 3.5 Temperature Sensor Installation Take (56+28+14)kW that composed by three control boxes as an example to clarify the pipe selection. Controller box capacity A (×100W) Liquld side(mm) Table 3-9 BOX 90200 There are five temperature sensors (T1, TA, T2A, T2, and T2B) and five extension wires in the accessories, as shown in Figure 3-8. BOX 200360 BOX 360560 90≤A≤200 200
Mounting location of indoor temperature sensors T1 and TA Installation of tube temperature sensors T2A, T2 and T2B 1. Weld the sleeves of the temperature sensors at the designated mounting location. Return Air Exhaust Air Outdoor Air Supply Air B Welding 1 A 1 2 2 A : Inlet air temperature T1 B : Outlet air temperature TA (optional) 45 Figure 3-10 2. Insert the temperature sensor into the sleeve after inserting the buckle.
N CN4 N’ M-smart CN30 SW3 1 2 3 4 SW4 1 2 3 4 ON XP12 XS12 CN15 1 2 ON SW9 SW10 1 2 3 ON Display board Specifications are subject to change without notice.
3.6.2 Wiring Inside the Electric Control Box For connections to the AHU control box : Pull the wires inside through the screw nut and fasten the nut firmly to ensure a good pull relief and water protection. The cables require an additional pull relief. Strap the cable with the installed tie wrap. Figure 3-15 Note： The connection with the terminal block must be secure. Failure to do so may result in heating due to poor contact, and even fire in serious cases.
3.6.3 Temperature Sensor Wiring 3.6.4 Cross section of main power cable The temperature sensors come with two wiring methods, by dialling DIP switch SW9-2. Please select the main power cable. Refer to Table 3-11 and Table 3-12.
0-10V Output control The DIP switch numbers of ENC2, ENC3 and ENC4 correspond to different voltage outputs. Depending on the DIP switch numbers of SW1-2, there are two control modes available, which are gear 1 and gear 3 fan speeds, respectively. 1. SW1-2 dialled to "OFF" (factory default) ENC2, ENC3 and ENC4 are respectively defined as low, middle and high voltage output signals. By default, ENC2 is set to 2V, ENC3 is set to 7V, and ENC4 is set to A (A is 10V).
3.6 Signal Cable Connection If the fan motor is a 3-Phase AC motor, SW1-2 must be set to "ON", and the ENC2 must be dialled to "2". The fan terminal block only supports high-speed output. When wiring the motor, refer to Figure 3-20. Only high-speed is available 1234 SW1 P Q E D1 D2 E 2. The control power of the contactor must be the same as the input power of the AHU control box. To Wired Controller (optional) E X Y E WATER To master/slave AHU control box comm.bus magnet ring CN9 3.
Example of signal wiring(Heat pump) Signal wire(P/Q/E) The signal wire between outdoor and master AHU control box Signal wire(X/Y/E) The signal wire between master AHU control box and slave AHU control box Factory controller OR L7 Master AHU T1,T2,T2A,T2B,TA L2 Signal wire(P/Q/E) Outdoor unit signal wire L1 (X /Y/E) The third party controller Signal wire (X/Y/E) 1# slave AHU L4 Signal wire (X/Y/E) N# slave AHU(N≤3) L5 L3 Centralized controller 1# AHU Signal wire(P/Q/E) Factory controller Mast
4 FUNCTION SETTINGS ON 1234 SW2 ON 4.1 Capacity Settings The capacity DIP switches for the AHU control box should be set after the box is installed. 1234 SW2 The capacity can be set through ENC1 and SW4-2. After completing the settings, power off and then power on the unit to apply the settings. Note: The number of slave AHU control boxes connected in parallel can only be set from the main board of the master AHU control box.
When the AHU control box is set to have a capacity of over 18 kW and the capacity DIP switch is greater than D, a virtual address will be generated. The virtual address is equivalent to the actual address and occupies the address bit. When setting the address, do not set the actual address to a virtual address that is already occupied.
4.5 Selection of Controllers Even if capacity setting with third party controller mode has been selected, a factory remote controller or wired controller is needed to set the address for the AHU control box, because the third party controller does not have this function. The factory controller or a third party controller can be selected for the AHU control box. The type of controllers can be selected through SW4-3 and SW4-4.
The definition of signals between the third party controller and AHU control box. Capacity setting requiment table(same in heating and cooling) Analog input 0-10V DC 1. Signals from the third party controller to the AHU control box.
3. One third party controller can’t control two or more AHUs at the same time. Third party controller - return air temperature control setting Definition of signals between the third party controller and the AHU control box Table 4-9 1. Signals from the third party controller to the AHU control box. Table 4-7 Signal Type Temp.
Min. Max. Cooling Set Temperature (°C) 7.4 7.25 7.55 26 26 7.8 7.65 7.95 27 27 8.2 8.05 8.35 28 28 8.6 8.45 8.75 29 29 9 8.85 9.15 30 30 9.4 9.25 10 Non settable Non settable Normal Voltage Range Heating Set Temperature (°C) 2) Definitions of each bit of SW2: ON 1234 ON 1234 Note: ON The analog voltage must be between maximum and minimum value.
3) Definitions of each bit of SW3: Return Air Temperature Control (SW4-1 is 0) Outlet Air Temperature Control (SW4-1 is 1) ON 1234 Valid for the master unit only ON 1234 Valid for the master unit only SW3-1 and SW3-2 are 00: anti-cold air temperature SW3-1 and SW3-2 are 00: anti-cold air temperature value in heating mode is 14°C value in heating mode is 15°C (factory default) SW3-1 and SW3-2 are 01: anti-cold air temperature SW3-1 and SW3-2 are 01: anti-cold air temperature value in heating mode is 12°C
5) Definitions of each bit of SW9: ON SW9-1 is 0: 2-digit digital display panel (factory default) Valid for the SW9-2 is 1: 3-digit digital display master unit only panel SW9-2 is 0: One or more AHU control boxes are connected in parallel to one AHU; one coil is connected to multiple control boxes; (shielding faults from ON the slave unit's temperature sensors T1, T2, T2A, TA and T2B) (factory default) Valid for the SW9-2 is 1: Multiple AHU control master unit only boxes are connected in parallel.
6 ERROR CODE AND QUERY Error Code Priority Definition Displayed content 1 Rcfrigerant leak error A1 2 Emergency shut down A0 3 No address is set FE (only displayed on the display board) 4 IDU address code repeated F7+repeated address, displayed alternately every 1s F7+repeated address 5 Mode conflict error E0 6 Communication error between IDU and ODU E1 7 T1 sensor error E2 8 T2 sensor error E3 9 T2B sensor error E4 10 T2A sensor error E5 11 IDU fan error E6 (reserved)
Query Wired controller query No. No.
16126000005075 V.
