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DC Inverter Multi VRF System User Manual

Thank you for selecting LENNOX air conditioners. Please read this

manual carefully before operation

and keep it for further reference.

Summary of Contents for VEP034N432US

Page 1: ...DC Inverter Multi VRF System User Manual Thank you for selecting LENNOX air conditioners Please read this manual carefully before operation and keep it for further reference...

Page 2: ...e reusing it 3 Please properly select the model according to actual using environment otherwise it may impact the using convenience 4 This product has gone through strict inspection and operational te...

Page 3: ...turer 3 After verification the defect of product is directly caused by corrosive gas 4 After verification defects are due to improper operation during transportation of product 5 Operate repair mainta...

Page 4: ...e 8 4 2 Connection Pipe 10 4 3 Installation of Connection Pipe 15 4 4 Disassembly of Compressor Feet 19 4 5 Vacuum Pumping Refrigerant Adding 19 4 6 Electric Wiring 21 5 Check Items after Installation...

Page 5: ...en confirmed as complying to corresponding partial unit requirements of this international standard The electrical interface shall comply with electrical security requirement voltage shall be 220 240...

Page 6: ...ects into air outlet or return air grille If you use gas heater or petroleum heater in the same room please open the door or window to maintain good air circulation otherwise the room may be lack of o...

Page 7: ...oncerning use of the appliance in a safe way and understand the hazards involved Children shall not play with the appliance Cleaning and user maintenance shall not be made by children without supervis...

Page 8: ...arts Fig 1 No Name Motor Fan blade Electric box assembly Gas pipe valve Liquid pipe valve Fig 2 No Name Motor Fan blade Electric box assembly Gas pipe valve Liquid pipe valve VEP042N432U VEP048N432U V...

Page 9: ...ithin 50 135 of that of the outdoor unit Model Max sets of connectable IDUs VEP034N432US 5 VEP042N432US 6 VEP048N432US 8 VEP042N432U 7 VEP048N432U 8 VEP060N432U 9 3 Can be connected to various indoor...

Page 10: ...ndard parts as required Parts for Outdoor Unit No Name Appearance Qty Remark 1 User Manual 1 2 Wiring match with resistance 1 Must be connected to the last IDU of communication connection 3 Corrugated...

Page 11: ...e explosive and corrosive gas or waste gas Make sure the location has space for heat exchange and maintenance so that unit can operate reliably with good ventilation ODU and IDU should stay as close a...

Page 12: ...ere are only for reference Please refer to actual products Unspecified dimensions are all in mm 4 1 Dimension of Outdoor Unit and Mounting Hole Unit Outline and Installation Dimension mm Fig 5 Unit mm...

Page 13: ...DC Inverter Multi VRF System 9 Fig 6 Unit mm Model A B C D E VEP027N432US VEP034N432US VEP042N432US 980 360 790 650 395 VEP048N432US 940 460 820 610 486...

Page 14: ...DC Inverter Multi VRF System 10 4 2 Connection Pipe 4 2 1 Schematic Diagram of Piping Connection Fig 7...

Page 15: ...wable Length and Height Difference of Connection Pipe Piping parameters of VEP027N432US VEP034N432US VEP042N432US Allowable value Fitting pipe Total length actual length of fitting pipe 250m L1 L2 L3...

Page 16: ...difference between ODU and IDU ODU at upper side 50m ODU at lower side 40m Height difference between IDUs 15m 4 2 3 Dimension of Pipe Main Pipe from ODU to the 1st Indoor Branch Dimension of pipe from...

Page 17: ...wnstream indoor units X kW Model Y type branch X 20 VEBC01A 20 X 30 VEBC01B 30 X 70 VEBC02A 70 X 135 VEBC03A 135 X VEBC04A 4 2 5 Dimension of Pipe between Indoor Branches Select pipe between indoor br...

Page 18: ...consistent with the dimension of indoor pipe Fig 12 Rated capacity of IDU C kW Gas pipe mm Liquid pipe mm C 2 8 9 52 6 35 2 8 C 5 0 12 7 6 35 5 0 C 14 0 15 9 9 52 14 0 C 16 0 19 05 9 52 16 0 C 28 0 2...

Page 19: ...4 3 2 Flaring Process 1 Use pipe cutter to cut the connection pipe in case it is unshaped 2 Keep the pipe downward in case cutting scraps get into the pipe Clear away the burrs after cutting 3 Remove...

Page 20: ...lated connection pipe and joint Then tie the sponge tightly with plastic tape 5 Connection pipe should be supported by a bearer rather than the unit 6 The bending angle of piping should not be too sma...

Page 21: ...o customer requirement or space limit outlet pipe can be installed from the front right or rear side Fig 18 Fig 19 4 3 6 Installation of Y type Branch 1 Y type Branch Fig 20 2 Y type branch has severa...

Page 22: ...hermal insulating material and adhesive tape for insulation from the air 2 Thermal insulating material shall be able bear the pipe temperature For heat pump unit liquid pipe should bear 70 C or above...

Page 23: ...from damage during transportation 2 metal pieces are fitted to outdoor unit s compressor feet before unit leaves factory See Fig 23 Fig 23 When installing the unit metal pieces for transportation must...

Page 24: ...installed liquid pipe Record the amount of additional refrigerant for convenience of after sales service 2 Calculation of the amount of additional refrigerant Calculation method of the quantity of ad...

Page 25: ...itional refrigerant 23 0 054 11 0 022 4 2 0 3 2 084kg 4 6 Electric Wiring 4 6 1 Notices for Wiring 1 Install units according to national wiring codes 2 Use air conditioner specialized power supply and...

Page 26: ...e system The circuit breaker should include magnetic trip function and thermal trip function so that system can be protected from short circuit and overload 10 Grounding Requirements 1 Air conditioner...

Page 27: ...2 6 0 VEP060N432U 220 240V 50Hz 208 230V 60Hz 40 1 6 0 2 6 0 NOTES Selection of circuit breaker and power cord in the above table is based upon unit s maximum power maximum current Specification of po...

Page 28: ...g screw according to the wiring diagram 2 Please be noted that engineering wiring cannot touch the pipe and appliance 3 This figure is only applicable for engineering wiring reference of power supply...

Page 29: ...he electric wiring and pipe connection installed correctly Unit may have malfunction or components may get damaged Unit is securely grounded or not Electrical leakage Power cord meets the required spe...

Page 30: ...sure unit s real time data can be checked through this computer The installation and connection of debugging software can be found in the Service Manual 9 Before test operation make sure unit is powe...

Page 31: ...communication and capacity ratio db On 05 On C2 On Communication between master ODU and driver has error Check the communication connection of ODU s main board and drive board When the error is elimi...

Page 32: ...or compressor is less than 8 hours Display will be as in the left until the preheat time reaches 8 hours Press main board s SW7 button to confirm manually that the preheat time has reached 8 hours The...

Page 33: ...w db On 12 On AE On Startup is confirmed After displaying for 2s system will choose 15_Cooling debugging or 16_Heating debugging according to ambient temperature If the project requests to add refrige...

Page 34: ...dentified by the system CL means the amount of indoor unit is very little amount of indoor unit 2 at this moment all buttons are invalid the system cannot enter into the next judgment 05_ Detect ODU s...

Page 35: ...09_ Refrigerant judgments before startup 09 U4 Display circularly System is lack of refrigerant and display will be as in the left Please cut off power of IDU and ODU and check if there is leakage on...

Page 36: ...ation temp As for temp in heat mode it is within 65 90 C and at least 10 C higher than the high pressure saturation temp 3 Defrosting temp C In cool mode defrosting temp is 4 10 C lower than system s...

Page 37: ...s abnormal condition e g unpleasant smell turn unit off and disconnect power immediately Then contact LENNOX authorized service center If unit continues operation despite the abnormal condition it may...

Page 38: ...sed by the expansion of panel and other parts of the unit due to temperature change Unit blows out dust Unit starts up after not operating for a long time Dust in indoor unit is blown out Unit emits o...

Page 39: ...of compressor operates abnormally uniform H1 Driving board of fan operates abnormally uniform P2 Voltage protection of driving board power of compressor uniform H2 Voltage protection of driving board...

Page 40: ...control and inverter fan driver Status Error Code Content Error Code Content A0 Unit waiting for debugging AP Debugging confirmation when starting up the unit A1 Inquiry of compressor operation parame...

Page 41: ...r filter and outer case of indoor and outdoor units 3 Clean away the dust and obstacles on indoor and outdoor units 4 If outdoor unit has rust please apply some paint to it so as to prevent the rust f...

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Page 44: ...ct us at 1 305 718 2901 lennoxglobalhvac lennoxintl com For a complete list of the registered and common law trademarks owned by Lennox Industries Inc please visit www lennox com 2020 Lennox Industrie...

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