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- Page 1 INSTALLATION/OPERATION INSTRUCTIONS VEP Heat Pump VRF SYSTEMS OUTDOOR UNITS ©2016 Lennox Industries Inc. Dallas, Texas, USA VEP075N432N VEP096N432N VEP120N432N And valid combinations VEP132N432N (see instructions inside) VEP150N432N LENNOX...
- Page 2 Preface Lennox VRF System, with the most advanced technologies in the world, uses Eco-friendly refrigerant R410A as its cooling medium. For correct installation and operation, please read this manual carefully. Before reading the manual, please note that: (1) For safety operation, please strictly follow the instructions in this manual.
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Page 3: Table Of Contents
Contents 1 Safety Precautions ........................1 2 Product Introduction ........................3 2.1 Names of Main Parts......................3 2.2 Combinations of Outdoor Units ................... 4 2.3 Combinations of Indoor and Outdoor Units ................ 5 2.4 The Range of Production Working Temperature ..............6 3 Preparation before Installation ...................... -
Page 4: Safety Precautions
Lennox VRF Unit 1 Safety Precautions means items that must be forbidden! Otherwise, it may lead to personal injury or death or serious damage. refers to things that must be followed. Incorrect operation may cause personal injury or death. Installation should be... - Page 5 Please contact appointed service center.If Lennox appointed service abnormality keeps going, the center for help. unit might be damaged and lead to electric shock or fire. Lennox will not assume responsibility of personal injury or equipment damage caused by...
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Page 6: Product Introduction
10%-100% can be realized. Various product lineup is provided with capacity range from 22.4kW to 246kW, which can be widely used in working area and especially applicable to the place with variable load change.Lennox air conditioner is absolutely your best choice. 2.1 Names of Main Parts... -
Page 7: Combinations Of Outdoor Units
Lennox VRF Unit ① ② ③ ④ ⑤ Electric Box Power cord Communication Name Fan, Motor Valve interface Assembly through-hole code through-hole 2.2 Combinations of Outdoor Units VEP246N432N VEP270N432N VEP282N432N VEP228N432N Model(Single) VEP096N432N VEP096N432N + VEP096N432N + VEP096N432N + Model(Combined) -
Page 8: Combinations Of Indoor And Outdoor Units
Lennox VRF Unit 2.3 Combinations of Indoor and Outdoor Units (1) The following table indicates the number of IDU for ODU ODU model Max number of connectable IDU (unit) VEP075N432N VEP096N432N VEP120N432N VEP132N432N VEP150N432N VEP171N432N VEP192N432N VEP216N432N VEP228N432N VEP246N432N VEP270N432N... -
Page 9: The Range Of Production Working Temperature
If the temperature is beyond the range, the safety protection measure of the unit may take effect, and the air conditioning unit will stop. 3 Preparation before Installation Note: The picture is only used for reference and the actual product prevails. Unit: mm. 3.1 Standard Parts Please use the following standard parts supplied by Lennox. -
Page 10: Installation Site
Lennox VRF Unit Parts for Outdoor Unit Number Name Picture Quantity Remarks Owner's Manual Must be connected to the last Wiring (match with IDU of communication resistance) connection Attach on the wired controller Mark (Master ) of master IDU or on the front panel 3.2 Installation Site... - Page 11 Lennox VRF Unit 3.2.1 When the outdoor unit is totally surrounded by walls, please refer to following figures for space dimension. 3.2.1.1 Space dimension for single-module unit Fig. 3 3.2.1.2 Space dimension for dual-module unit Fig. 4 3.2.1.3 Space dimension for three-module unit...
- Page 12 Lennox VRF Unit 3.2.1.4 Space dimension for four-module unit Fig.6 3.2.2 When there is wall (or similar obstruction) above the unit, keep the distance between the unit top and the wall at least 300mm or above. When the unit is located in a totally open space with no obstructions in four directions, keep the distance between the unit top and wall at least 1500mm or above (See Fig.7).
- Page 13 Lennox VRF Unit 3.2.3 Space dimension for multiple-module unit For keeping good ventilation, make sure there is no obstructions above the unit. When the unit is located at a half-open space (front and left/right side is open), install the unit as per the same or opposite direction.
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Page 14: Piping Work Requirements
Lennox VRF Unit 3.2.5 Take snow into consideration when installing the outdoor unit Fig.12 3.3 Piping Work Requirements There should be no fall among outdoor modules. Refer to the table below for piping work requirements. R410A Refrigerant System Outer Diameter (mm/inch) -
Page 15: Installation Instruction
Lennox VRF Unit 4 Installation Instruction 4.1 Physical Dimension of the Outdoor Unit and Mounting Hole Outline and Physical Dimension of VEP075N432N and VEP096N432N unit Fig.13... - Page 16 Lennox VRF Unit Outline and Physical Dimension of VEP120N432N, VEP132N432N and VEP150N432N unit Fig.14...
- Page 17 Lennox VRF Unit Outline and Physical Dimension of VEP171N432N, VEP192N432N and VEP216N432N unit Fig.15...
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Page 18: Connection Pipe
Lennox VRF Unit 4.2 Connection Pipe 4.2.1 Schematic Diagram of Piping Connection Fig.16... - Page 19 Lennox VRF Unit 4.2.2 Schematic Diagram of Piping Sequence VEP075N432Nand VEP096N432N Fig.17 VEP120N432N, VEP132N432N and VEP150N432N Fig.18...
- Page 20 Lennox VRF Unit VEP171N432N, VEP192N432N and VEP216N432N Fi g.19 4.2.3 Allowable pipe length and drop height among indoor and outdoor units Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown in the figure below.
- Page 21 Lennox VRF Unit L10: Length from the first branch to the farthest IDU; L11: Length from the first branch to the nearest IDU; Equivalent length of branch of IDU is 0.5m Allowable R410A Refrigerant System Fitting Pipe Value ≤1000 L1+L2+L3+L4+…+L9+a+b+…+i+j Total length (actual length) of fitting pipe ≤165...
- Page 22 Lennox VRF Unit Φ38.1 Φ22.2 VEP282N432N VEP300N432N Φ38.1 Φ22.2 VEP324N432N Φ41.3 Φ22.2 Φ44.5 Φ22.2 VEP342N432N Φ44.5 Φ22.2 VEP366N432N Φ44.5 Φ22.2 VEP378N432N VEP396N432N Φ44.5 Φ22.2 VEP420N432N Φ44.5 Φ22.2 VEP432N432N Φ44.5 Φ22.2 Φ44.5 Φ22.2 VEP450N432N Φ25.4 VEP474N432N Φ44.5 Φ25.4 VEP492N432N Φ44.5 VEP516N432N Φ25.4...
- Page 23 Lennox VRF Unit 4.2.4 Connection Pipe among Outdoor Modules Fig.21 Fig.22 Note: When the distance between outdoor units exceeds 2m, U-type oil trap should be added at low-pressure gas pipe. A+B10m. 4.2.5 Fitting pipe between Outdoor Unit and the First Manifold 4.2.5.1 For single module system, pipe size (between outdoor unit and the first manifold)is...
- Page 24 Lennox VRF Unit Pipe size of basic outdoor module is shown as follows: Pipe between ODU and the first branch of IDU Basic Module Gas Pipe(mm) Liquid Pipe(mm) VEP075N432N Φ19.05 Φ9.52 VEP096N432N Φ22.2 Φ9.52 VEP120N432N Φ25.4 Φ12.7 VEP132N432N Φ25.4 Φ12.7 VEP150N432N Φ28.6...
- Page 25 Lennox VRF Unit Select the branch of outdoor module Module’s capacity (C) Model Select the branch of outdoor 504≤C VEBC05 module 4.2.5.3 Fitting pipe between two manifolds from basic modules Pipe size (between two manifolds from basic modules)is based on the total capacity of upstream modules.
- Page 26 Lennox VRF Unit Fig.26 Pipe between ODU and the first branch of IDU Basic Module(single module) Gas Pipe(mm) Liquid Pipe(mm) VEP075N432N Φ19.05 Φ9.52 Φ22.2 Φ9.52 VEP096N432N Φ25.4 Φ12.7 VEP120N432N Φ25.4 Φ12.7 VEP132N432N Φ28.6 Φ12.7 VEP150N432N Φ28.6 Φ15.9 VEP171N432N Φ28.6 Φ15.9 VEP192N432N Φ28.6...
- Page 27 Lennox VRF Unit Pipe between ODU and the first branch of IDU Total rated capacity of outdoor modules (multi-modular system) Gas Pipe(mm) Liquid Pipe(mm) Φ28.6 Φ15.9 VEP171N432N Ф28.6 Ф15.9 VEP192N432N Ф28.6 Ф15.9 VEP216N432N Ф28.6 Ф15.9 VEP228N432N Ф31.8 Ф19.05 VEP246N432N Ф31.8 Ф19.05...
- Page 28 Lennox VRF Unit 4.2.5.5 Manifold at indoor unit side Manifold at indoor unit side can be selected as per total capacity of downstream indoor unit(s). Refer to the following table. Fig.28 Total capacity of downstream indoor R410A Refrigerant System Model unit(s) C (kW) C≤20.0...
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Page 29: Installation Of The Connection Pipe
Lennox VRF Unit Φ12.7 Φ6.35 C≤5.6 Φ15.9 Φ9.52 5.6＜C≤14.2 Φ19.05 Φ9.52 14.2＜C≤22.4 Φ22.2 Φ9.52 22.4＜C≤28.0 Φ25.4 Φ12.7 28.0＜C≤40.0 Φ28.6 Φ12.7 40.0＜C≤45.0 Φ28.6 Φ15.9 45.0＜C≤68.0 Φ31.8 Φ19.05 68.0＜C≤96.0 Φ38.1 Φ19.05 96.0＜C≤135.0 Φ44.5 Φ22.2 135.0＜C 4.2.5.7 Fitting pipe between indoor unit and manifold Manifold should be matched with fitting pipe of indoor unit. - Page 30 Lennox VRF Unit (2) Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the requirements for welding process. Rosin joints and pin holes are not allowable. (3) When laying the pipes, be careful not to deform them. The radius of bending parts should be more than 200mm.
- Page 31 Lennox VRF Unit Fig.33 Total capacity of downstream indoor Y-type manifold Model unit(s) (X) VEBC01A X≤200 VEBC01B 200＜X≤300 VEBC02A 300＜X≤700 VEBC03A 700＜X≤1350 VEBC04A 1350＜X (4) Manifold is isolated by insulating material that can bear 120℃ or higher temperature. Manifold attached foam can not be taken as insulating material.
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Page 32: Air Purging And Refrigerant Charge
Lennox VRF Unit Fig.34 4) Manifold attached foam can not be taken as insulating material. 5) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap the tape so tightly, otherwise the insulation effect will be weakened. - Page 33 Lennox VRF Unit How much additional refrigerant should be charged Total refrigerant charging amount R= Pipeline charging amount A + ∑charging amount B of every module (1) Pipeline charging amount Pipeline charging amount A= ∑Liquid pipe length×refrigerant charging amount of every 1m...
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Page 34: Electric Wiring
Lennox VRF Unit Suppose that A (Quantity of refrigerant added to connection pipe) = ∑ Length of liquid pipe x Quantity of refrigerant added to liquid pipe per meter) = 5kg R (Quantity of added refrigerant in total) = 5+0=5kg... - Page 35 Lennox VRF Unit Circuit Circuit breaker Wire size of breaker capacity for Wire size of Model Basic models power supply capacity combined combined uni (mm units (A) VEP075N432N 2.5×5 VEP075N432N VEP096N432N 2.5×5 VEP096N432N VEP120N432N 4.0×5 VEP120N432N VEP132N432N 6.0×5 VEP132N432N VEP150N432N 6.0×5...
- Page 36 Lennox VRF Unit Circuit Circuit breaker Wire size of breaker capacity for Wire size of Model Basic models power supply capacity combined combined uni (mm units (A) 2.5×5+10×5+10× VEP696N432N 280+560+560+615 25+63+63+63 2.5+10+10+10 5+10×5 2.5×5+10×5+10× VEP720N432N 280+ 560+615+615 25+63+63+63 2.5+10+10+10 5+10×5 2.5×5+10×5+10×...
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Page 37: Connection Of Power Cord
Lennox VRF Unit If indoor unit is equipped with auxiliary electric heater, select capacity of circuit breaker as per auxiliary electric heater, which requires special setting. Indoor unit models (with auxiliary Capacity of circuit Min. sectional area of Min. sectional area of... - Page 38 Lennox VRF Unit 1) water pipe, 2) gas pipe, 3) drainage pipe, 4)other places that are considered by professionals as unreliable. (5) Power cord and communication wire should be separated, with a distance of more than 20cm. Otherwise, system’s communication may not work well.
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Page 39: System Communication
Lennox VRF Unit Wiring method for the power cord of VEP171N432N VEP192N432N and VEP216N432N The external power cord should be fixed by wire clamps. The communi- -cation line passes throu- -gh the rubber ring The communication line passes through the rubber ring . - Page 40 CAN bus mode is taken for communication between IDU and ODU and communication among IDUs. 4.6.3 Selection and connection mode of Lennox communication material 4.6.3.1 Select communication material Note: if air conditioners are installed at places where there’s strong electromagnetic interference, the communication wire of IDU and wired controller must use shielded wire and the communication wire between IDU and IDU/ODU must use shielded twisted pair.
- Page 41 3. If unit is installed in places with intense /60227 IEC 53) magnetic field or strong interference, it is necessary to use shielded wire. Fig.42 4.6.3.2 Connection mode of communication (1) All communication wires of Lennox must be connected in series rather than in star.
- Page 42 Lennox VRF Unit Fig.43 Fig.44 Fig.45 (2) All communication wires of Lennox are connected by screws.
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Page 43: Connection Method And Steps For System Communication
4.6.4 Communication address Auto addressing technology is adopted for Lennox IDU and ODU. No need to set address codes manually. Only the addresses of master unit and central control are needed to be set (address of central control is only needed when there are multiple refrigeration systems). - Page 44 Lennox VRF Unit Fig.47 Connection of single unit Fig.48 Connection of modular units Note: ①For modular outdoor units, if there are multiple outdoor modules, then the master unit must be the first outdoor module on the communication wire and should not connect with...
- Page 45 Lennox VRF Unit IDU (master unit is set by SA8 of the outdoor main board). ②For modular outdoor units, if there are multiple outdoor modules, then indoor units must be connected with the last slave module of ODU (slave module is set by SA8 of the outdoor main board).
- Page 46 Lennox VRF Unit Fig.52 Two wired controllers control multiple IDUs When two wired controllers control multiple IDUs, the wired controller can be connected to any one IDU, provided that the connected IDU is of the same series. Meanwhile, one and only one of the wired controllers must be set as a slave controller.
- Page 47 Lennox VRF Unit Fig.53 Note: ①Wired controller and light board remote receiver can be used at the same time. ②When light board remote receiver is used, please use remote controller at the same time. 4.7.4 Communication connection of central controlling units Note:The centralized controller can be installed when it is necessary.
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Page 48: External Electrical Wiring Diagram
Lennox VRF Unit Fig.54 4.8 External Electrical Wiring Diagram Each unit should be equipped with a circuit breaker for short circuit protection and exceptional overload protection. Besides, a main circuit breaker shall be prepared for IDUs and ODUs in order to connect or disconnect power of the entire system. - Page 49 Lennox VRF Unit Fig.55 Note: maximum number of IDU is based upon ODU capacity. For details, please refer to the introduction of units’ combination. 4.8.2 External wiring diagram of modular connection Fig.56...
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Page 50: Check Items After Installation And Trial Run
Lennox VRF Unit Note: maximum number of ODU (N) and maximum number of IDU (n) are based upon the combination type of ODU. For details, please refer to the introduction of units’ combination. 5 Check Items after Installation and Trial Run 5.1 Check Items after Installation... - Page 51 Lennox VRF Unit not. (6) Check the valve: For single-module unit, fully open the gas and liquid valve and close oil balance valve; For dual/three module unit, fully open the gas, liquid valve and oil balance valve. 5.2.2 Trial run 5.2.2.1 Notices...
- Page 52 Lennox VRF Unit pipe or at least 70% of the needed refrigerant has been added. (6) Description of each stage of debugging progress: Description of each stage of debugging progress Debugging —— Progress code Status code code LED1 LED2 LED3...
- Page 53 Lennox VRF Unit components No error in outdoor components. Start light light light next progress. System detects error in indoor components. XXXX is the project no. of the faulted IDU. 3s later, relevant error XXXX/Error light light light code is displayed. For example, IDU no.
- Page 54 Lennox VRF Unit Outdoor pipeline and valves are not light light light normal. System detects error in indoor pipeline. XXXX is the project no. of the faulted IDU. 3s later, error code U8 is displayed. light light XXXX/U8 light For example, IDU no. 100 has U8 error, then LED3 displays like this: 01 (2s later) 00 (2s later) U8, and repeat again.
- Page 55 Lennox VRF Unit Code LED1 LED2 LED3 Progress Display Display Display Code Code Code status status status System doesn’t have master unit. Reset light light light master unit. 01_01 Set More than 2 master units are set. Reset up master...
- Page 56 Lennox VRF Unit Quantity of 04_Confirm the Light Light connected blink quantity of IDUs IDUs If the quantity displayed is the same with actual quantity, then press SW7 confirmation button on the master unit to confirm it. Unit will start next progress:...
- Page 57 Lennox VRF Unit Below is relevant error: —— Debugging code Progress code Status code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status 06_Detect Error System detects error in outdoor outdoor Light Light Light code components.
- Page 58 Lennox VRF Unit —— Debugging code Progress code Status code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status 08_Confirm Preheat time for compressor is less than preheated Light Light Light compressor Step 13: progress 09 is “Refrigerant judgments before startup”...
- Page 59 Lennox VRF Unit 10_Status judgments of Light Light Light Outdoor valves are not fully turned on. outdoor valves before startup Then check the big and small valves whether they are fully turned on. After the check, press SW6 return button to restart the judgments.
- Page 60 Lennox VRF Unit LED1 LED2 LED3 progress Display Display Display Code code Code status status status Debugging is enabled in cooling mode Light Light Light (debugging mode, auto-selected by system). Error Error occurs during debugging in Light Light Light code cooling mode.
- Page 61 For specific details, please refer to System Functions Setup. If no special requirements, skip this step. Step 20: deliver the product to user and inform user about usage precautions. 5.2.3 Appendix: judgment reference of normal operational parameters Reference of Debug Parameters of Lennox VRF System Debug item Parameter name Unit Reference ℃...
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Page 62: Common Malfunction And Troubleshooting
3-phase power voltage is 390v, then the bus voltage after rectification is: 390v X 1.414=551v. It’s normal driven bus voltage if actual voltage varies 15v from the calculated voltage. Reference of Debug Parameters of Lennox VRF System Debug item Parameter name Unit... - Page 63 For detail operation methods, please refer to the Lennox Installation and Maintenance Manual. ②If problem can not be solved after checking the above items, please contact Lennox service center and show phenomena and models. Following circumstance are not malfunction.
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Page 64: Error Indication
Lennox VRF Unit The room odor absorbed by the unit is blew The unit emits odor Operating out again Indoor unit still Indoor fan motor will keep running 20-70s so After every indoor unit receive "stop" signal, fan runs after switch... - Page 65 Lennox VRF Unit Lennox VRF Units...
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Page 66: Maintenance And Care
(6) Check if the outdoor unit is installed firmly. If there is something abnormal, please contact the Lennox appointed service center. 8.4 Maintenance after Seasonal (1) Cut off main power supply of the unit. -
Page 67: Parts Replacement
Lennox. Warranty should meet the folowing requirements: (1) First run of the unit should be operated by professional personnel from Lennox appointed service center. (2) Only Lennox manufactured accessories can be used on the machine. - Page 68 Contact us at +1-305-718-2901 LennoxGlobalHVAC@Lennoxintl.com 2015 Lennox Industries Inc. For a complete list of the registered and common law trademarks owned by Lennox Industries Inc., please visit www.lennox.com...
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