Otec BSCF-D ULTIMA Series Technical Manual
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Otec BSCF-D ULTIMA Series Technical Manual

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  • Page 2 CONTENTS Part 1 General Information ................3 Part 2 Outdoor Unit Engineering Data ............13 Part 3 System Design and Installation ............69...
  • Page 3 Part 1 General Information 1 Indoor and Outdoor Unit Capacities ............4 2 External Appearance ................5 3 Nomenclature ..................6 4 Combination Ratio .................. 7 5 Selection Procedure ................8...
  • Page 4 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units Table 1-1.1: Indoor unit abbreviation codes Abbreviation code Type BECW One-way Cassette BECM Compact Four-way Cassette BECS Four-way Cassette BEMP Medium Static Pressure Duct BEWM Wall-mounted Table 1-1.2: Indoor unit capacity range Capacity Capacity BECW...
  • Page 5 2 External Appearance 2.1 Indoor Units Table 1-2.1: Indoor unit appearance One-way Four-way Cassette Cassette Compact Four-way Cassette Wall-mounted Medium Static Pressure Duct 2.2 Outdoor Units Table 1-2.2: Outdoor unit appearance 30/40/50 Models 60/70 Models...
  • Page 6 4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor unit Table 1-4.1: Indoor and outdoor unit combination ratio limitations Type Minimum combination ratio Maximum combination ratio ULTIMA Series outdoor units 130% Table 1-4.2: Combinations of Indoor and outdoor units Outdoor unit capacity...
  • Page 7 5 Selection Procedure 5.1 Procedure Step 1: Establish design conditions Design temperature and humidity (indoor and outdoor) Required heat load of each room System peak load Piping length, level differences Indoor unit specifications (type and quantity) Step 2: Select indoor units Decide indoor unit safety factor Select indoor unit models ensuring that: Indoor unit capacity corrected for indoor air temperature WB...
  • Page 8 5.2 Example The following is a selection example based on total heat load for cooling. Figure 1-5.1: Room plan Room B Room C Room A Room D Step 1: Establish design conditions  Indoor air temperature 25°C DB, 18°C WB; outdoor air temperature 33°C DB. ...
  • Page 9 Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table Indoor air temperature Capacity 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB index Model 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB 30°C DB 32°C DB...
  • Page 10  The number of connected indoor units is 4 and the maximum number of connected indoor units on the 10kW outdoor unit is 6, so the number of connected indoor units is within the limitation.  Calculate the corrected capacity of the outdoor unit: The sum of the indoor unit CIs is 120 and the CI of the 10kW outdoor unit is 100, so the combination ratio is 120 / 100 = 120%.
  • Page 11 the required heat load is 10.5kW.  Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown in Table 1-5.5), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.6. As the sum of CIs of the indoor units is 120.

  • Page 12: Table Of Contents

    Part 2 Outdoor Unit Engineering Data 1 Specifications ................... 14 2 Dimensions ....................16 3 Installation Space Requirements .............. 17 4 Piping Diagrams ..................18 5 Wiring Diagrams ..................20 6 Electrical Characteristics ................22 7 Functional Components and Safety Devices ..........23 8 Capacity Tables..................

  • Page 13: Specifications

    1 Specifications BCSF030N0A4-DTM090 / BCSF040N0A6-DTM115 / BCSF050N0A7-DTM140 Table 2-1.1: 30/40/50 model specifications BCSF030N0A4-DTM090 BCSF040N0A6-DTM115 BCSF050N0A7-DTM140 Model name Power supply 1 phase, 220-240V, 50/60Hz 30.7 37.5 47.8 kBtu/h Capacity Cooling 1.94 2.35 3.18 Power input 4.12 4.26 3.77 Total capacity 45-130% of outdoor unit capacity Connectable indoor unit Quantity...
  • Page 14 BCSF060N0A8-DTM160 / BCSF070N0A9-DTM190 Table 2-1.2: 60/70 model specification BCSF060N0A8-DTM160 BCSF070N0A9-DTM190 Model name Power supply 1 phase, 220-240V, 50/60Hz 54.6 64.8 kBtu/h Capacity Cooling Power input Total capacity 45-130% of outdoor unit capacity Connectable indoor unit Quantity Type DC inverter DC inverter Compressors Quantity Oil type...

  • Page 15: Dimensions

    2 Dimensions BCSF030N0A4-DTM090 / BCSF040N0A6-DTM115 / BCSF050N0A7-DTM140 Figure 2-2.1: 30/40/50 model front view dimensions Figure 2-2.2: 30/40/50 model top view dimensions BCSF060N0A8-DTM160 / BCSF070N0A9-DTM190 Figure 2-2.3: 60/70 model front view dimensions Figure 2-2.4: 60/70 model front top dimensions Table 2-2.1: Outdoor unit dimensions (unit: mm) Model 30/40/50 60/70...

  • Page 16: Installation Space Requirements

    3 Installation Space Requirements Figure 2-3.1: Single unit installation top view (unit: mm) Figure 2-3.2: Single unit installation side view (unit: mm) Figure 2-3.3: Multiple unit installation top view (unit: mm) Figure 2-3.4: Multiple unit installation side view (unit: mm)

  • Page 17: Piping Diagrams

    4 Piping Diagrams BCSF030N0A4-DTM090 / BCSF040N0A6-DTM115 / BCSF050N0A7-DTM140 Figure 2-4.1: 30/40/50 model piping diagram Heat exchanger Filter Liquid pipe Electronic expansion valve Filter Stop valve Gas pipe Stop valve High pressure switch Capillary tube BCSF060N0A8-DTM160 / BCSF070N0A9-DTM190 Figure 2-4.2: 60/70 model piping diagram PCB cooler Heat exchanger Filter...
  • Page 18 Key components: 1. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation efficiency is up to 99%. 2. Accumulator: Stores liquid refrigerant and oil to protect compressor from liquid hammering. 3.

  • Page 19: Wiring Diagrams

    5 Wiring Diagrams BCSF030N0A4-DTM090 / BCSF040N0A6-DTM115 / BCSF050N0A7-DTM140   Figure 2‐5.1: 30/40/50 model wiring diagram...
  • Page 20 BCSF060N0A8-DTM160 / BCSF070N0A9-DTM190 Figure 2‐5.2: 60/70 model wiring diagram COMP. YELLOW/GREEN FAN1 (WHITE) CN53 CN17 CN52 (YELLOW) CN50 (RED) ORANGE MENU D502 CN15 ORANGE NET-ADD (GREY) HEAT D503 BLUE ENC3 BLUE Q503 MAIN BOARD (BLACK) ENC2 L503 POWER Q502 L502 D501 EEV1 CN22 Q501 L501 1 2 3 1 2 3 CN51...

  • Page 21: Electrical Characteristics

    6 Electrical Characteristics Table 2-6.1: Outdoor unit electrical characteristics Power supply Compressors Outdoor fan motors Capacity Min. Max. Rated motor output Volts TOCA volts volts (kW) BCSF030N0A4-DTM090 50/60 220-240 23.0 25.0 0.09 BCSF040N0A6-DTM115 50/60 220-240 23.0 25.0 0.09 BCSF050N0A7-DTM140 50/60 220-240 23.0 25.0...

  • Page 22: Functional Components And Safety Devices

    7 Functional Components and Safety Devices Table 2-7.1: BCSF030, 040, 050 functional components and safety devices BCSF030N0A4- BCSF040N0A6- BCSF050N0A7- Item DTM090 DTM115 DTM140 Discharge temperature switch Compressor Compressor top temperature sensors 90°C = 5kΩ ± 3% Crankcase heater 25W × 1 Inverter module Inverter module temperature sensor 115°C...

  • Page 23: Capacity Tables

    8 Capacity Tables 8.1 Cooling Capacity Tables Table 2-8.1: BCSF030N0A4-DTM090 cooling capacity Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp.
  • Page 24 Table 2-8.1: BCSF030N0A4-DTM090 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 5.28 1.05 6.42 1.08...
  • Page 25 Table 2-8.1: BCSF030N0A4-DTM090 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 4.32 0.80 5.26 0.82...
  • Page 26 Table 2-8.1: BCSF030N0A4-DTM090 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 3.36 0.57 4.09 0.58...
  • Page 27 Table 2-8.1: BCSF030N0A4-DTM090 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 2.40 0.35 2.92 0.36...
  • Page 28 Table 2-8.2: BCSF040N0A6-DTM115 cooling capacity Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 7.80 1.57 9.10 1.61 11.05...
  • Page 29 Table 2-8.2: BCSF040N0A6-DTM115 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 6.60 1.27 8.03 1.30...
  • Page 30 Table 2-8.2: BCSF040N0A6-DTM115 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 5.40 0.97 6.57 0.99...
  • Page 31 Table 2-8.2: BCSF040N0A6-DTM115 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 4.20 0.69 5.11 0.70...
  • Page 32 Table 2-8.2: BCSF040N0A6-DTM115 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 3.00 0.43 3.65 0.44...
  • Page 33 Table 2-8.3: BCSF050N0A7-DTM140 cooling capacity Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 9.36 2.13 10.92 2.18 13.26...
  • Page 34 Table 2-8.3: BCSF050N0A7-DTM140 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 7.92 1.72 9.64 1.76...
  • Page 35 Table 2-8.3: BCSF050N0A7-DTM140 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 6.48 1.31 7.88 1.34...
  • Page 36 Table 2-8.3: BCSF050N0A7-DTM140 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 5.04 0.93 6.13 0.95...
  • Page 37 Table 2-8.3: BCSF050N0A7-DTM140 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 3.60 0.58 4.38 0.59...
  • Page 38 Table 2-8.4: BCSF060N0A8-DTM160 cooling capacity Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 10.92 2.37 12.74 2.43 15.47...
  • Page 39 Table 2-8.4: BCSF060N0A8-DTM160 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 9.24 1.92 11.24 1.96...
  • Page 40 Table 2-8.4: BCSF060N0A8-DTM160 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 7.56 1.46 9.20 1.49...
  • Page 41 Table 2-8.4: BCSF060N0A8-DTM160 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 5.88 1.03 7.15 1.06...
  • Page 42 Table 2-8.4: BCSF060N0A8-DTM160 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 4.20 0.64 5.11 0.66...
  • Page 43 Table 2-8.5: BCSF070N0A9-DTM190 cooling capacity Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 12.48 2.58 14.56 2.65 17.68...
  • Page 44 Table 2-8.5: BCSF070N0A9-DTM190 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 10.56 2.09 12.85 2.14...
  • Page 45 Table 2-8.5: BCSF070N0A9-DTM190 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 8.64 1.59 10.51 1.63...
  • Page 46 Table 2-8.5: BCSF070N0A9-DTM190 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 6.72 1.13 8.18 1.16...
  • Page 47 Table 2-8.5: BCSF070N0A9-DTM190 cooling capacity (continued) Indoor air temp. (°C DB / °C WB) Outdoor 20.8 / 14.0 23.3 / 16.0 25.8 / 18.0 27.0 / 19.0 28.2 / 20.0 30.7 / 22.0 32.0 / 24.0 temp. (°C DB) 4.80 0.70 5.84 0.72...
  • Page 48 8.2 Capacity Correction Factors for Piping Length and Level Difference Figure 2-8.2: BCSF060, 070 rate of change in cooling Figure 2-8.1: BCSF030, 040, 050 rate of change in cooling capacity capacity Notes: The horizontal axis shows equivalent length of piping between farthest indoor unit and outdoor unit; the vertical axis shows the largest level difference between indoor unit and outdoor unit.

  • Page 49: Operating Limits

    9 Operating Limits Figure 2-9.1: Cooling operating limits...

  • Page 50: Sound Levels

    10 Sound Levels 10.1 Overall Table 2-10.1: Sound pressure level Model dB(A) BCSF030N0A4-DTM090 BCSF040N0A6-DTM115 BCSF050N0A7-DTM140 BCSF060N0A8-DTM160 BCSF070N0A9-DTM190 Notes: Sound pressure level is measured at a position 1m in front of the unit and 1.3m above the floor in a semi-anechoic chamber. During in-situ operation, sound pressure levels may be higher as a result of ambient noise.

  • Page 51: Accessories

    11 Accessories 11.1 Standard Accessories Table 2-11.1: Standard accessories Name Shape Quantity Function Outdoor unit installation manual Outdoor unit owner's manual Indoor unit owner's manual Connecting pipe (for 60/70 model) For outdoor unit gas pipe connection...
  • Page 52 Part 3 System Design and Installation 1 Preface to Part 3 ................... 54 2 Unit Placement and Installation ............55 3 Refrigerant Piping Design ..............59 4 Refrigerant Piping Installation ............... 66 5 Drain Piping ..................77 6 Insulation ....................81 7 Charging Refrigerant ................

  • Page 53: Preface To Part 3

    1 Preface to Part 3 1.1 Notes for Installers Boxes The information contained in this Engineering Data Book may primarily be of use during the system design stage of a OMEGA ULTIMA Series VRF project. Additional important information which may primarily be of use during field installation has been placed in boxes, such as the example below, titled “Notes for installers”.

  • Page 54: Unit Placement And Installation

    2 Unit Placement and Installation 2.1 Outdoor Units 2.1.1 Placement considerations Placement of outdoor units should take account of the following considerations:  Air conditioners should not be exposed to direct radiation from a high-temperature heat source.  Air conditioners should not be installed in positions where dust or dirt may affect heat exchangers. ...
  • Page 55 2.1.3 Base structures Outdoor unit base structure design should take account of the following considerations:  A solid base prevents excess vibration and noise. Outdoor unit bases should be constructed on solid ground or on structures of sufficient strength to support the units’ weight. ...
  • Page 56 2.1.5 Acceptance and unpacking  Notes for installers  When units are delivered check whether any damage occurred during shipment. If there is damage to the surface or outside of a unit, submit a written report to the shipping company. ...
  • Page 57 2.2 Indoor Units 2.2.1 Placement considerations Placement of indoor units should take account of the following considerations:  Sufficient space for drain piping and for access during servicing and maintenance should be allowed.  To ensure a good cooling/heating effect, short-circuit ventilation (where outlet air returns quickly to a unit’s air inlet) should be avoided.

  • Page 58: Refrigerant Piping Design

    3 Refrigerant Piping Design 3.1 Design Considerations Refrigerant piping design should take account of the following considerations:  The amount of brazing required should be kept to a minimum.  On the two inside sides of the first indoor branch joint (“A” in Figures 3-3.4 and Figure 3-3.5) the system should, as far as possible, be equal in terms of number of units, total capacities and total piping lengths.
  • Page 59 3.4 The Permitted Piping Lengths and Level Differences The piping length and level difference requirements that apply are summarized in Table 3-3.2 and are fully described as follows (refer to Figure 3-3.1 and Figure 3-3.3): Figure 3-3.1: The first connecting method (Welding) Figure 3-3.2: The second connecting method (Welding) Legend Main pipe...
  • Page 60 Figure 3-3.3: The third connecting method (Flaring) Outdoor Unit Legend Main pipe a to f Indoor auxiliary pipes Table 3-3.2: Summary of permitted refrigerant piping lengths and level differences Permitted value Piping Total Pipe Length(Actual) ≤100m L1+L2+L3+L4+L5+a+b+c+d+e+f ≤45m(30/40/50 model) L1+L2+L3+L4+L5+f (The first connecting method) Actual Length Maximum ≤60m(60/70model)
  • Page 61 3.5 Selecting Piping Diameters Tables 3-3.4 to 3-3.6 below, specify the required pipe diameters for the indoor and outdoor piping. The main pipe (L ) and first indoor branch joint (A) should be sized according to whichever of Tables 3-3.4 and 3-3.5 indicates the larger size. Figure 3-3.4: Selecting piping diameters Legend Main pipe...
  • Page 62 3.6 Refrigerant Piping Selection Example The example below illustrates the piping selection procedure for a system consisting of one outdoor unit (16kW) and 6 indoor units. The system's equivalent length of all liquid pipes and gas pipes is in excess of 90m. Figure 3-3.5: Refrigerant piping selection example Legend Main pipe...
  • Page 63 3.7 Branch Joints Branch joint design should take account of the following:  U-shaped branch joints should be used – tee joints are not suitable. Branch joint dimensions are given in Tables 3-3.7.  To ensure even distribution of refrigerant, branch joints should not be installed within 500mm of a 90° bend, another branch joint or the straight section of piping leading to an indoor unit, with the minimum 500mm being measured from the point where the branch joint is connected to the piping, as shown in Figure 3-3.6.
  • Page 64 3.8 Refrigerant Leakage Precautions R410A refrigerant is not flammable in air at temperatures up to 100°C at atmospheric pressure and is generally considered a safe substance to use in air conditioning systems. Nevertheless, precautions should be taken to avoid danger to life in the unlikely event of a major refrigerant leakage.

  • Page 65: Refrigerant Piping Installation

    4 Refrigerant Piping Installation 4.1 Procedure and Principles 4.1.1 Installation procedure  Notes for installers Installation of the refrigerant piping system should proceed in the following order: Pipe Pipe brazing Pipe Gas tightness Joint Vacuum drying insulation and installation flushing test insulation Note: Pipe flushing should be performed once the brazed connections have been completed with the exception of the...
  • Page 66 4.2 Storing Copper Piping 4.2.1 Pipe delivery, storage and sealing  Notes for installers  Ensure that piping does not get bent or deformed during delivery or whilst stored.  On construction sites store piping in a designated location.  To prevent dust or moisture entering, piping should be kept sealed whilst in storage and until it is about to be connected.
  • Page 67 4.3.3 Expanding copper piping ends  Notes for installers  Ends of copper piping can be expanded so that another length of piping can be inserted and the joint brazed.  Insert the expanding head of the pipe expander into the pipe. After completing pipe expansion, rotate the copper pipe a few degrees to rectify the straight line mark left by the expanding head.
  • Page 68 4.3.5 Bending piping Bending copper piping reduces the number of brazed joints required and can improve quality and save material.  Notes for installers Piping bending methods  Hand bending is suitable for thin copper piping (Ф6. 35mm - Ф12. 7mm). ...
  • Page 69 4.5 Brazing Care must be taken to prevent oxide forming on the inside of copper piping during brazing. The presence of oxide in a refrigerant system adversely affects the operation of valves and compressors, potentially leading to low efficiency or even compressor failure.
  • Page 70 … box continued from previous page Piping orientation during brazing Brazing should be conducted downwards or horizontally to avoid filler leakage. Figure 3-4.6: Piping orientation during brazing Piping overlap during brazing Table 3-4.3 specifies the minimum permissible piping overlap and the range of permissible gap sizes for brazed joints on piping of different diameters.
  • Page 71 4.6 Branch Joints  Notes for installers  Use U-shaped branch joints as specified on the Figure 3-4.8: Branch joint orientation construction drawings – do not replace U-shaped branch joints with tee joints.  Indoor branch joints may be installed either horizontally or vertically.
  • Page 72 4.7.2 Procedure  Notes for installers Warning Only use nitrogen for flushing. Using carbon dioxide risks leaving condensation in the piping. Oxygen, air, refrigerant, flammable gases and toxic gases must not be used for flushing. Use of such gases may result in fire or explosion. Procedure The liquid and gas sides can be flushed simultaneously;...
  • Page 73 4.8 Gastightness Test 4.8.1 Purpose To prevent faults caused by refrigerant leakage, a gastightness test should be performed before system commissioning. 4.8.2 Procedure  Notes for installers Warning Only dry nitrogen should be used for gastightness testing. Oxygen, air, flammable gases and toxic gases must not be used for gastightness testing.
  • Page 74 4.8.3 Leak detection  Notes for installers The general methods for identifying the source of a leak are as follows: 1. Audio detection: relatively large leaks are audible. 2. Touch detection: place your hand at joints to feel for escaping gas. 3.
  • Page 75 4.9.2 Procedure  Notes for installers During vacuum drying, a vacuum pump is used to lower the pressure in the piping to the extent that any moisture present evaporates. At 5mmHg (755mmHg below typical atmospheric pressure) the boiling point of water is 0°C. Therefore a vacuum pump capable of maintaining a pressure of -756mmHg or lower should be used.

  • Page 76: Drain Piping

    5 Drain Piping 5.1 Design Considerations Drain piping design should take account of the following considerations:  Indoor unit condensate drain piping needs to be of sufficient diameter to carry the volume of condensate produced at the indoor units and installed at a slope sufficient to allow drainage. Discharge as close as possible to the indoor units is usually preferable.
  • Page 77 installed too close to indoor unit lift pumps. Figure 3-5.5: Drain piping air vents  Air conditioner drain piping should be installed separately from waste, rainwater and other drain piping and should not come into direct contact with the ground. ...
  • Page 78 Table 3-5.2: Vertical drain piping diameters Nominal PVC piping Capacity (L/h) Remarks diameter (mm) PVC25 Branch piping only PVC32 PVC40 PVC50 1440 PVC63 2760 Branch or main piping PVC75 5710 PVC90 8280 5.4 Drain Piping for Units with Lift Pumps Drain piping for units with lift pumps should take account of the following additional considerations: ...
  • Page 79 5.6 Water tightness Test and Water Flow Test Once installation of a drainage piping system is complete, water tightness and water flow tests should be performed.  Notes for installers Water tightness test  Fill the piping with water and test for leakages over a 24-hour period. Water flow test (natural drainage test) ...

  • Page 80: Insulation

    6 Insulation 6.1 Refrigerant Piping Insulation 6.1.1 Purpose During operation, the temperature of the refrigerant piping varies. Insulation is required to ensure unit performance and compressor lifespan. During cooling, the gas pipe temperature can be very low. Insulation prevents condensation forming on the piping.
  • Page 81 Figure 3-6.1: Installation of joint insulation (unit: mm) 6.2 Drain Piping Insulation  Use rubber/plastic insulating tube with a B1 fire resistance rating.  The insulation should typically be in excess of 10mm thick.  For drain piping installed inside a wall, insulation is not required. ...

  • Page 82: Charging Refrigerant

    7 Charging Refrigerant 7.1 Calculating Additional Refrigerant Charge The additional refrigerant charge required depends on the lengths and diameters of the outdoor and indoor liquid pipes. Table 3-7.1 shows the additional refrigerant charge required per meter of equivalent pipe length for different diameters of pipe.
  • Page 83 … box continued from previous page Step 4 · Open the three valves on the pressure gauge to begin charging refrigerant. · When the amount charged reaches R (kg), close the three valves. If the amount charged has not reached R (kg) but no additional refrigerant can be charged, close the three valves on the pressure gauge, run the outdoor unit in cooling mode, and then open the yellow and blue valves.

  • Page 84: Electrical Wiring

    8 Electrical Wiring 8.1 General  Notes for installers Caution  All installation and wiring must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation.  Electrical systems should be grounded in accordance with all applicable legislation. ...
  • Page 85  Notes for installers The power supply should be connected to the outdoor unit power supply terminals as shown in Figure 3-8.2. Figure 3-8.2: Outdoor unit 1-phase power supply terminals 8.3 Communication Wiring Communication wiring design and installation should adhere to the following requirements: ...
  • Page 87 8.4 Wiring example Figure 3-8.4: System communication wiring example Note: The wired controller and centralized controller in the dashed box are optional accessories. If necessary, please contact the local distributor for purchase.

  • Page 88: Installation In Areas Of High Salinity

    9 Installation in Areas of High Salinity 9.1 Caution Do not install outdoor units where they could be directly exposed to sea air. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient performance. Outdoor units installed in seaside locations should be placed such as to avoid direct exposure to the sea air and additional anticorrosion treatment options should be selected, otherwise the service life of the outdoor units will be seriously affected.

  • Page 89: Commissioning

    10 Commissioning 10.1 Multi-system Projects For projects with multiple refrigerant systems, each independent refrigeration system (i.e. each system of one outdoor unit and its connected indoor units) should be given a test run independently, before the multiple systems that make up a project are run simultaneously.
  • Page 90 the CHECK button on the outdoor unit’s main PCB and complete the cooling mode columns of one Sheet D and one Sheet E of the system commissioning report for the outdoor unit. Run the system in heating mode with the following settings: temperature 30°C; fan speed high. After one hour, complete Sheet B of the system commissioning report then check the system parameters using the CHECK button on the outdoor unit’s main PCB and complete the heating mode columns of one Sheet D and one Sheet E of the system commissioning report for the outdoor unit.

  • Page 91: Appendix To Part 3 - System Commissioning Report

    11 Appendix to Part 3 – System Commissioning Report A total of up to 3 report sheets should be completed for each system:  One Sheet A, one Sheet B per system.  One Sheet C per outdoor unit.
  • Page 92 System Commissioning Report – Sheet A SYSTEM INFORMATION Project name and location Customer company System name Installation company Commissioning date Agent company Commissioning Outdoor ambient temp. engineer Model Serial no. Power supply (V) Outdoor unit information OUTDOOR UNIT Compressor suction pipe Current (A) temperature System pressure at check...
  • Page 93 System Commissioning Report – Sheet B Project name and location System name RECORD OF ISSUES SEEN DURING COMMISSIONING Serial no. of Description of observed issue Suspected cause Troubleshooting undertaken relevant unit OUTDOOR UNIT FINAL CHECKLIST SW2 system check performed? Any abnormal noise? Any abnormal vibration? Fan rotation normal? OMEGA representative...
  • Page 94 System Commissioning Report – Sheet C Project name and location System name Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode 0.-- Actual value = value displayed Operating frequency 1.-- Operating mode 0-Standby;2-Cooling;4-Forced cooling The fan speed index is related to the fan 2.-- Operating fan speed level speed in rpm.
  • Page 95 OMEGA BCSF-D ULTIMA Mini VRF Technical Manua info@omegavrf.com info@otecvrf.com www.omegavrf.com www.otecvrf.com BCSFCM-TM1D0622...

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