1 Preface 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 Trust V5 X 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”. Notes for installers Notes for installers boxes contain important information which may primarily be of use during field installation, rather than during desk‐based system design. 1.2 Definitions In this Engineering Data Book, the term “applicable legislation” refers to all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation. 1.3 Precautions All system installation including installation of piping and electrical works must only be carried out by competent and ...
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. Air conditioners should not be installed in locations where exposure to oil or to corrosive or harmful gases, such as acidic or alkaline gases, may occur. Air conditioners should not be installed in locations where exposure to salinity may occur unless the anti‐corrosion treatment for high‐salinity areas customization option has been added and the precautions described in Installation Manual, 10 “Installation in Areas of High Salinity” are taken. Outdoor units should be installed in well‐drained, well‐ventilated positions that are as close as possible to the indoor units. 2.1.2 Spacing Outdoor units must be spaced such that sufficient air may flow through each unit. Sufficient airflow across heat exchangers is essential for outdoor units to function properly. Figures 3‐2.1 to 3‐2.3 show spacing requirements in three ...
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2.1.3 Master and slave unit positioning In systems with multiple outdoor units, the units should be placed in order from largest capacity unit to smallest capacity unit. The largest capacity unit must be placed on the first branch, and be set as the master unit, while the others should be set as slave units. Refer to the V5 X Service Manual, Control Manualfor details of how to set units as master/slave. The example in Figure 3‐2.4 illustrates the placing of units in a 48HP combination: Place the 22HP unit on the first branch and set it as the master unit. Place the 16HP and 10HP units on the next branches and set them as slave units. Figure 3‐2.4: Positioning of master and slave units C (10HP) A (22HP) B (16HP) Outdoor units (48HP) First outdoor Indoor Indoor Indoor branch joint unit A unit B unit C 2.1.4 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 ...
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Figure 3‐2.5: Outdoor unit typical concrete base structure design (unit: mm) Outdoor unit Φ10 Expansion bolt Rubber anti‐vibrat i on pads Rubber anti‐vibration pads Solid ground / surface Concrete base h=200 ≥80 Figure 3‐2.6: Expansion bolt positioning Table 3‐2.1: Expansion bolt spacings Dimension (mm) 8, 10, 12HP 14, 16, 18, 20, 22HP A 740 1090 B 990 1340 C 723 723 D 790 790 ...
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. To prevent excessive noise or vibration during operation, suspension rods or other weight‐bearing fixings should typically be able to bear twice the unit’s weight. Notes for installers Before installing an indoor unit, check that the model to be installed is as specified in the construction drawings and confirm the correct orientation of the unit. Ensure that units are installed at the correct height. To allow smooth condensate drainage and to ensure unit stability (to prevent excessive noise or vibration), ensure that units are level to within 1° of the horizontal. If a unit is not level to within 1° of the horizontal, water ...
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3.3 Ducting for 8HP, 10HP and 12HP Units 3.3.1 Option A – Transverse ducting Figure 3‐3.2: Transverse ducting for 8HP, 10HP and 12HP units (unit: mm) 8 × ST3.9 self‐ Support threading screws Radius Radius Remove the θ steel mesh first Air outlet louver (optional) Table 3‐3.1: Duct dimensions Table 3‐3.2: External static pressure Dimensions (mm) A A ≥ 300 ESP (Pa) Remarks B B ≥ 250 ...
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3.4 Ducting for 14HP, 16HP, 18HP, 20HP and 22HP Units 3.4.1 Option A – Transverse ducting Figure 3‐3.4: Transverse ducting for 14HP, 16HP, 18HP, 20HP and 22HP units (unit: mm)) 1290 Support 12 × ST3.9 self‐ Radius threading screws Radius Remove the steel meshes θ first Air outlet louver (optional) Table 3‐3.5: Duct dimensions Dimensions (mm) Table 3‐3.6: External static pressure A A ≥ 300 ESP (Pa) Remarks ...
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3.5 Fan Performance The default external static pressure of outdoor units’ air outlets is zero. With the steel mesh cover removed the external static pressure is 20Pa. With customization options, external static pressure can be increased to 40Pa. Figure 3‐3.6: 8HP and 10HP units fan performance Figure 3‐3.7: 12HP units fan performance 12,200 12,200 12,000 12,000 11,800 11,800 11,600 11,600 11,400 11,400 11,200 11,200 11,000 11,000 10,800 10,800 Static pressure (Pa) Static pressure (Pa) Figure 3‐3.8: 14HP and 16HP units fan performance Figure 3‐3.9: 18HP units fan performance 16,100 14,600 16,050 14,400 16,000 14,200 15,950 14,000...
3.6 Snow Shielding In areas of high snowfall, snow shields should be installed on air inlets and outlets to prevent snow from entering the units. Additionally, the height of the base structures should be increased so as to raise the units further off the ground. Figure 3‐3.11: Outdoor unit snow shielding Snow shield for air inlet Snow shield for air outlet Snow shield for air inlet 4 Refrigerant Piping Design 4.1 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 3‐4.2 and 3‐4.3) the system should, as far as possible, be equal in terms of number of units, total capacities and total piping lengths. 4.2 Material Specification Only seamless phosphorus‐deoxidized copper piping that complies with all applicable legislation should be used. Temper grades and minimum thicknesses for different diameters of piping are specified in Table 3‐4.1. ...
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4.3 Permitted Piping Lengths and Level Differences The piping length and level difference requirements that apply are summarized in Table 3‐4.3 and are fully described as follows (refer to Figure 3‐4.2): 1. Requirement 1: The total length of piping in one refrigerant system should not exceed 1000m. When calculating the total length of piping, the actual length of the indoor main pipes (the piping between the first indoor branch joint and all other indoor branch joints, L ) should be doubled. to L 2. Requirement 2: The piping between the farthest indoor unit (N ) and the first outdoor branch joint (N) should not exceed 175m (actual length) and 200m (equivalent length). (The equivalent length of each branch joint is 0.5m.) 3. Requirement 3: The piping between the farthest indoor unit ) and first indoor branch joint (A) should not exceed Ʃ 40m in length ( } + i L ≤ 40m) unless the following conditions are met and the following measures taken, in which case the permitted length is up to 90m: Conditions: Each indoor auxiliary pipe (from each indoor unit to its nearest branch joint) joint does not exceed 40m in length (a to m each ≤ 40m). The difference in length between {the piping from first indoor branch joint (A) to the farthest indoor unit (N )} and {the piping from the first indoor branch joint (A) to the nearest indoor unit (N )} does not exceed 40m. That Ʃ Ʃ is: ( } + i) ...
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Figure 3‐4.2: Permitted refrigerant piping lengths and level differences (140) 12HP 12HP 22HP (140) (71) First indoor branch joint (28) (140) (140) (140) (140) (71) (28) (140) (56) (56) Piping between farthest indoor unit and first indoor branch joint L ≤ 40m Equivalent length of piping between farthest indoor unit and first outdoor branch joint L ≤ 200m Legend Main pipe Indoor main pipes to L Figures in parentheses a to m Indoor auxiliary pipes indicate indoor unit A to L ...
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4.4 Selecting Piping Diameters Tables 3‐4.4 to 3‐4.8, 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 3‐4.4 and 3‐4.5 indicates the larger size. Figure 3‐4.3: Selecting piping diameters (140) (71) 12HP 12HP 22HP (140) First indoor branch joint (28) (140) (140) (140) (140) (71) Alternative outdoor unit arrangements (28) Main pipe (140) (56) (56) Legend Main pipe Main pipe to L Indoor main pipes Figures in parentheses ...
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Table 3‐4.5: Main pipe ) and first indoor branch joint (A) (L Equivalent length of all liquid pipes < 90m Equivalent length of all liquid pipes ≥ 90m Total capacity of outdoor units Gas pipe (mm) Liquid pipe (mm) Branch joint kit Gas pipe (mm) Liquid pipe (mm) Branch joint kit 8HP FQZHN‐02D FQZHN‐02D Φ22.2 Φ9.53 Φ22.2 Φ12.7 10HP FQZHN‐02D FQZHN‐02D Φ22.2 Φ9.53 Φ25.4 Φ12.7 12‐14HP FQZHN‐02D FQZHN‐03D Φ25.4 Φ12.7 Φ28.6 Φ15.9 16HP FQZHN‐03D FQZHN‐03D Φ28.6 ...
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4.5 Refrigerant Piping Selection Example The example below illustrates the piping selection procedure for a system consisting of three outdoor units (22HP + 12HP + 12HP) and 13 indoor units. The system's equivalent total piping length is in excess of 90m; the piping between the farthest indoor unit and the first indoor branch joint is less than 40m in length; and each indoor auxiliary pipe (from each indoor unit to its nearest branch joint) is less than 10m in length. Figure 3‐4.4: Refrigerant piping selection example (140) (71) 12HP 12HP 22HP (140) First indoor branch joint (28) (140) (140) (140) (140)
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There are three outdoor units in the system. Refer to T abl e 3‐4.7. Outdoor branch joints M and N are TFQZHW‐03N1D. 16 ...
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4.6 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 3‐4.9 and 3‐4.10. To avoid accumulation of oil in the outdoor units, outdoor branch joints should be installed horizontally and must not be higher than the outdoor unit refrigerant outlets. Refer to Figure 3‐5.9 in Installation Manual, 5.6 “Branch Joints”. Indoor branch joints may be installed either horizontally or vertically. 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 3‐4.5. Figure 3‐4.5: Branch joint spacing and separation from bends (unit:mm) 500 or more 500 or more 500 or more 500 or more 500 or more Indoor Indoor Indoor unit unit unit 17 ...
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Table 3‐4.9: Indoor branch joint dimensions (unit: mm) Model Gas side joints Liquid side joints TFQZHN‐01D TFQZHN‐02D TFQZHN‐03D TFQZHN‐04D TFQZHN‐05D TFQZHN‐06D 18 ...
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4.7 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. Precautions should be taken in accordance with all applicable legislation. Where no applicable legislation exists, the following may be used as a guide: Air conditioned rooms should be large enough that if leakage of all the refrigerant in the system occurs, the concentration of the refrigerant in the room does not reach a level dangerous to health. A critical concentration (at which point R410A becomes dangerous to human health) of 0.3 kg/m can be used. The potential concentration of refrigerant in a room following a leak can be calculated as follows: Calculate the total amount in of refrigerant in the system (“A”) as the nameplate charge (the charge in the system when delivered from the factory) plus the additional charge added as per Installation Manual, 8.1 “Calculating Additional Refrigerant Charge”. Calculate the total volume (“B”) of the smallest room into which refrigerant could potentially leak. ...
5 Refrigerant Piping Installation 5.1 Procedure and Principles 5.1.1 Installation procedure Notes for installers Installation of the refrigerant piping system should proceed in the following order: Pipe Pipe brazing Pipe Joint Gastightness 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 final connections to the indoor units. That is, flushing should be performed once the outdoor units have been connected but before the indoor units are connected. 5.1.2 Three principles for refrigerant piping Measures Reasons Seal piping during storage Particles such as oxide produced CLEAN ...
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5.2 Storing Copper Piping 5.2.1 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. If piping is to be used soon, seal the openings with plugs or adhesive tape. If piping is to be stored for a long time, charge the piping with nitrogen at 0.2‐0.5MPa and seal the openings by brazing. Storing piping directly on the ground risks dust or water ingress. Wooden supports can be used to raise piping off the ground. During installation, ensure that piping to be inserted through a hole in a wall is sealed to ensure dust and/or fragments of wall do not enter. Be sure to seal piping being installed outdoors (especially if being installed vertically) to prevent rain entering. 5.3 Manipulating Copper Piping 5.3.1 De‐oiling Notes for installers Lubrication oil used during some copper pipe manufacturing processes can cause deposits to form in R410A refrigerant systems, causing system errors. Oil‐free copper piping should therefore be selected. If ordinary (oily) ...
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5.3.3 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. Caution Ensure that the expanded section of piping is smooth and even. Remove any burrs that remain after cutting. Figure 3‐5.1: Expanding copper piping ends 5.3.4 Flared joints Flared joints should be used where a screw thread connection is required. ...
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5.3.5 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). Mechanical bending (using a bending spring, manual bending machine or powered bending machine) is suitable for a wide range of diameters (Ф6. 35mm ‐ Ф54.0mm). Caution When using a spring bender, ensure that the bender is clean Figure 3‐5.3: Pipe bending in excess of 90° before inserting it in the piping. After bending a copper pipe, ensure that there are no wrinkles or Wrinkles deformation on either side of the pipe. may appear Ensure that bend angles do not exceed 90°, otherwise wrinkles may ...
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5.5 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. To prevent oxidation, during brazing nitrogen should be flowed through the refrigerant piping. Notes for installers Warning Never flow oxygen through piping as doing so aids oxidation and could easily lead to explosion and as such is extremely dangerous. Take appropriate safety precautions such as having a fire extinguisher to hand whilst brazing. Flowing nitrogen during brazing Use a pressure reducing valve to flow nitrogen through copper piping at 0.02‐0.03MPa during brazing. Start the flow before brazing starts and ensure that the nitrogen continuously passes through the section being brazed until the brazing is complete and the copper has cooled down completely. ...
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… box continued from previous page Piping orientation during brazing Brazing should be conducted downwards or horizontally to avoid filler leakage. Figure 3‐5.6: Piping orientation during brazing Brazing Brazing Brazing Piping overlap during brazing Table 3‐5.3 specifies the minimum permissible piping overlap and the range of permissible gap sizes for brazed joints on piping of different diameters. Refer also to Figure 3‐5.7. Figure 3‐5.7: Piping overlap and gap for brazed joints Legend A Inner diameter of larger pipe Brazing D Outer diameter of smaller pipe B Inlaid depth (overlap) Table 3‐5.3: Piping overlap and gap for brazed joints Minimum Permissible A – D D (mm) permissible B (mm) (mm) ...
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5.6 Branch Joints Notes for installers Use U‐shaped branch joints as specified on the Figure 3‐5.8: Branch joint orientation construction drawings – do not replace U‐shaped branch joints with tee joints. U-shaped branching pipe To avoid accumulation of oil in the outdoor units, outdoor branch joints should be installed horizontally and must not be higher than the outdoor unit refrigerant outlets. Refer A direction view to Figure 3‐5.9. Wrong Correct 10°...
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5.7 Piping Connections Between Outdoor Units The piping connecting the outdoor units should be horizontal and must not be higher than the refrigerant outlets. If necessary, to avoid obstacles the piping may be vertically offset below the outlets. When inserting a vertical offset to avoid an obstacle, the whole outdoor piping should be offset, rather than just the section adjacent to the obstacle. Refer ...
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5.8.2 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; alternatively, one side can be flushed first and then Steps 1 to 8 repeated, for the other side. The flushing procedure is as follows: 1. Cover the inlets and outlets of the indoor units to prevent dirt getting blown in during pipe flushing. (Pipe flushing should be carried out before connecting the indoor units to the piping system.) 2. Attach a pressure reducing valve to a nitrogen cylinder. 3. Connect the pressure reducing valve outlet to the inlet on the liquid (or gas) side of the outdoor unit. 4. Use blind plugs to block all liquid (gas) side openings, except for the opening at the indoor unit which is furthest from the outdoor units (“Indoor unit A” in Figure 3‐5.11). 5. Start to open the nitrogen cylinder valve and gradually increase the pressure to 0.5MPa. 6.
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5.9 Gastightness Test 5.9.1 Purpose To prevent faults caused by refrigerant leakage, a gastightness test should be performed before system commissioning. 5.9.2 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. Use of such gases may result in fire or explosion. Procedure The gastightness test procedure is as follows: Step 1 Once the piping system is complete and the indoor and outdoor units have been connected, vacuum the piping to ‐0.1MPa. Step 2 Charge the piping with nitrogen at 4MPa and leave for at least 24 hours. After the test period of at least 24 hours, observe the pressure in the piping and assess whether or not the observed pressure indicates the presence of a leak. Allow for any change in ambient temperature over the test ...
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5.9.3 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. Soapy water detection: small leaks can be detected by the formation of bubbles when soapy water is applied to a joint. 4. Refrigerant leak detection: for leaks that are difficult to detect, refrigerant leak detection may be used as follows: Pressurize the piping with nitrogen at 0.3MPa. Add refrigerant into the piping until the pressure reaches 0.5MPa. Use a halogen refrigerant detector to find the leak. If the leak source cannot be found, continuing charging with refrigerant to a pressure of 4MPa and then search again. 5.10 Vacuum Drying 5.10.1 Purpose ...
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5.10.2 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. Using a vacuum pump with a discharge in excess of 4L/s and a precision level of 0.02mmHg is recommended. Caution Before performing vacuum drying, make sure that all the outdoor unit stop valves are firmly closed. Once the vacuum drying is complete and the vacuum pump is stopped, the low pressure in the piping could suck vacuum pump lubricant into the air conditioning system. The same could happen if the vacuum pump stops unexpectedly during the vacuum drying procedure. Mixing of pump lubricant with compressor oil could ...
6 Drain Piping 6.1 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. To prevent the drain piping becoming excessively long, consideration should be given to installing multiple drain piping systems, with each system having its own drainage point and providing drainage for a subset of the overall set of indoor units. The routing of drain piping should take into consideration the need to maintain sufficient slope for drainage whilst avoiding obstacles such as beams and ducting. The drain piping slope should be at least 1:100 away from indoor units. Refer to Figure 3‐6.1. Figure 3‐6.1: Drain piping minimum slope requirement 1 c m / 1 m a b o v e 1 / 1 0 0 ...
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piping. Refer to Figure 3‐6.5. Air vents should not be installed too close to indoor unit lift pumps. Figure 3‐6.5: Drain piping air vents Vent 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. Drain piping diameter should be not less than the indoor units’ drain piping connection. To allow inspection and maintenance, the piping clamps shipped with units should be used to attach drain piping to indoor units – adhesive should not be used. Thermal insulation should be added to drain piping to prevent condensation forming. Thermal insulation should extend all the way to the connection with the indoor unit. Units with drain pumps should have separate drain piping systems from systems that use natural drainage. 6.2 Water Traps For indoor units with a high negative pressure differential at the outlet of the Figure 3‐6.6: Drain piping water traps ...
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Table 3‐6.2: Vertical drain piping diameters Nominal PVC piping Capacity (L/h) Remarks diameter (mm) PVC25 25 Branch piping only PVC32 32 410 PVC40 40 730 PVC50 50 1440 PVC63 63 2760 Branch or main piping PVC75 75 5710 PVC90 90 8280 6.4 Drain Piping for Units with Lift Pumps Drain piping for units with lift pumps should take account of the following additional considerations: ...
Notes for installers Installation of the drain piping should proceed in the following order: Drain piping Watertightness Indoor unit installation Drain piping insulation installation test Caution Ensure that all joints are firm and once the drain piping is all connected conduct a watertightness test and water flow test. Do not connect air conditioner drain piping to waste, rainwater or other drain piping and do not let air conditioner drain piping come into direct contact with the ground. ...
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Minimum thicknesses for refrigerant piping insulation are specified in Table 3‐7.1. In hot, humid environments, the thickness of insulation should be increased over and above the specifications in Table 3‐7.1. Table 3‐7.1: Refrigerant piping insulation thickness Minimum insulation Pipe outer diameter thickness (mm) (mm) Ф6.35 Ф9.53 15 Ф12.7 Ф15.9 Ф19.1 Ф22.2 Ф25.4 20 Ф28.6 Ф31.8 Ф38.1 Ф41.3 Ф44.5 25 ...
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straight‐through joint Copper pipe Insulation Insulation material material Figure 3‐7.1: Installation of joint insulation (unit: mm) 7.2 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. Use suitable adhesive to seal seams and joints in the insulation and then bind with cloth reinforced tape of width not less than 50mm. Ensure tape is fixed firmly to avoid condensation. Ensure the drain piping insulation adjacent to the indoor unit drainage water outlet is fixed to the unit itself using adhesive, to prevent condensation and dripping. 7.3 Ducting Insulation Suitable insulation should be added to ducting in according with all applicable legislation. 38 ...
8 Charging Refrigerant 8.1 Calculating Additional Refrigerant Charge The additional refrigerant charge required depends on the lengths and diameters of the outdoor and indoor liquid pipes. Table 3‐8.1 shows the additional refrigerant charge required per meter of equivalent pipe length for different diameters of pipe. The total additional refrigerant charge is obtained by summing the additional charge requirements for each of the outdoor and indoor liquid pipes, as in the following formula, where L to L represent the equivalent lengths of the pipes of different diameters. Assume 0.5m for the equivalent pipe length of each branch joint. Additional refrigerant charge R (kg) = @Φ6.35) × 0.022 Table 3‐8.1: Additional refrigerant charge Additional refrigerant charge per + @Φ9.53) × 0.057 Liquid side meter of equivalent length of piping (mm) + @Φ12.7) × 0.110 piping (kg) + @Φ15.9) × 0.170 Φ6.35 0.022 Φ9.53 0.057 + @Φ19.1) × 0.260 Φ12.7 0.110 + @Φ22.2) × 0.360 Φ15.9 0.170 Φ19.1 ...
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… box continued from previous page Step 3 · Loosen the connection port which connected with yellow pipeline and the pressure gauge, and open the refrigerant tank slightly to let the refrigerant eliminate the air. Caution: open the tank slowly to avoid freezing your hand. · Set the weighing scale to zero. 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 units in cooling mode, and then open the yellow and blue valves. Continue charging until the full R (kg) of refrigerant has been charged, then close the yellow and blue valves. Note: Before running the system, be sure to complete all the pre‐commissioning checks as listed in Installation Manual, 11.3 “Pre‐commissioning Checks” and be sure to open all stop valves as running the system with the stop valves closed would damage the compressor. Figure 3‐8.1: Charging refrigerant Pressure gauge Master unit Slave unit Slave unit...
9 Electrical Wiring 9.1 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. Overcurrent circuit breakers and residual‐current circuit breakers (ground fault circuit interrupters) should be used in accordance with all applicable legislation. Wiring patterns shown in this data book are general connection guides only and are not intended for, or to include all details for, any specific installation. ...
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Figure 3‐9.1: Outdoor unit power supply wiring Power facilities 1 Outdoor unit Leakage (with leakage protector) protector Manual Outdoor unit switch Outdoor unit Leakage protector Manual switch Outdoor unit Outdoor unit Outdoor unit Branch box Outdoor unit Outdoor unit Branch box Power facilities 2 Outdoor unit (with leakage protector) ...
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0.75mm three‐core shielded cable should be used for communication wiring. Using other types of cable can lead to interference and malfunction. Indoor communication wiring: The P and Q communication wires should be connected one unit after another in a daisy chain from the outdoor unit to the final indoor unit as shown in Figure 3‐9.4. At the final indoor unit, a 120Ω resistor should be connected between the P and Q terminals. After the final indoor unit, the communication wiring should NOT be continued back to the outdoor unit – that is, do not attempt to form a closed loop. The P and Q communication wires and should NOT be grounded. The shielding nets of the communication wires should be connected together and grounded. Grounding can be achieved by connecting to the metal casing adjacent to the P Q E terminals of the outdoor unit electrical control ...
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Master Slave Slave unit unit unit H1 H2 E H1 H2 E P Q E P Q E P Q E Notes for installers The communication wires should be connected to the master outdoor unit terminals indicated in Figure 3‐9.5 and Table 3‐9.1. Caution Communication wiring has polarity. Care should be taken to connect the poles correctly. Figure 3‐9.5: Master outdoor unit communication terminals Table 3‐9.1: Communication connections ...
Power wire Power wire Branch box Power wire Power wire Outdoor unit terminals Outdoor unit terminals Outdoor unit terminals H1H2E P Q E H1H2E P Q E H1H2E P Q E ABC N ABC N ABC N Power wire Communication wire Communication wire Communication wire Communication wire Communication wire Indoor unit terminals Indoor unit terminals Indoor unit terminals P Q E ABC DE P Q E ABC DE P Q E ABC DE Power wire...
Figure 3‐10.2. Ensure that base structures drain well so that outdoor unit footings do not become waterlogged. Check that outdoor unit casing drainage holes are not blocked. Figure 3‐10.1: Installation in a well‐ventilated indoor area Figure 3‐10.2: Installation outdoors under a canopy Canopy Discharge duct Canopy support Indoor area Sea wind Sea wind Outdoor unit Outdoor unit 10.3 Inspection and maintenance In addition to standard outdoor unit servicing and maintenance, the following additional inspections and maintenance should be undertaken for outdoor units installed in seaside locations: A comprehensive post‐installation inspection should check for any scratches or other damage to painted surfaces and any damaged areas should be repainted/repaired immediately. ...
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≥8 Invalid 11.2 Multi‐system Projects For projects with multiple refrigerant systems, each independent refrigeration system (i.e. each system of up to four outdoor units and their connected indoor units) should be given a test run independently, before the multiple systems that make up a project are run simultaneously. 11.3 Pre‐commissioning Checks Before turning on the power to the indoor and outdoor units, ensure the following: 1. All indoor and outdoor refrigeration piping and communication wiring has been connected to the correct refrigeration system and the system to which each indoor and outdoor unit belongs is clearly marked on each unit or ...
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heated the compressor oil sufficiently. 5. Run the system: Run the system in cooling mode with the following settings: temperature 17°C; fan speed high. After one hour, complete Sheet A of the system commissioning report then check the system parameters using the SW2 system check button on each 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 each 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 SW2 system check button on each 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 each outdoor unit. 6. Finally, complete Sheet C of the system commissioning report. 11.4.2 Commissioning test run of multiple refrigerant systems Once the commissioning test run of each refrigerant system has been satisfactorily completed as per Installation Manual, 11.4.1 “Commissioning test run of single refrigerant system”, run the multiple systems that make up a project simultaneously and check for any abnormalities. ...
12 Appendix– System Commissioning Report A total of up to 11 report sheets should be completed for each system: One Sheet A, one Sheet B and one Sheet C per system. One Sheet D and one Sheet E per outdoor unit. 49 ...
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V5 X Series System Commissioning Report – Sheet A SYSTEM INFORMATION Project name and location Customer company System name Installation company Commissioning date Agent company Outdoor ambient temp. Commissioning engineer A‐B B‐C C‐A Power supply (V) OUTDOOR UNIT INFORMATION Master unit Slave unit 1 Slave unit 2 Slave unit 3 Model ...
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V5 X Series System Commissioning Report – Sheet B Project name and location System name OUTDOOR UNITS Master unit Slave unit 1 Slave unit 2 Slave unit 3 Compressor suction pipe temperature System pressure at check port A B C A B C A B ...
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V5 X Series System Commissioning Report – Sheet C Project name and location System name RECORD OF ISSUES SEEN DURING COMMISSIONING Serial no. of No. Description of observed issue Suspected cause Troubleshooting undertaken relevant unit 1 2 3 ...
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V5 X Series System Commissioning Report – Sheet D Project name and location System name Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode Outdoor unit address Master unit: 0; slave units: 1, 2, 3 ‐ 0 Outdoor unit capacity Refer to Note 1 ‐ 1 Number of outdoor units Displayed on master unit PCB only ‐ 2 Number of indoor units as set on PCB Displayed on master unit PCB only ‐ 3 Outdoor unit output metric (total of all units) Displayed on master unit PCB only ...
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V5 X Series System Commissioning Report – Sheet E Project name and location System name … table continued from previous page Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode 22 Compressor discharge pressure (MPa) Actual value = value displayed x 0.1 23 Reserved Number of indoor units currently in communication with 24 Actual value = value displayed master unit 25 Number of indoor units currently operating Actual value = value displayed ...
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