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TOSHIBA Variable Refrigerant Flow

TOSHIBA Variable Refrigerant Flow. Modular Multi. 8-46hp capacity. 40 indoor units. inverter control. energy efficiency. compactness. flexible design. phased installation. piping design program. performance data retrieval . . 10hp (28kW) – inverter driven. 10hp (28kW) – fixed speed.

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TOSHIBA Variable Refrigerant Flow

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  1. TOSHIBA Variable Refrigerant Flow

  2. Modular Multi

  3. 8-46hp capacity 40 indoor units inverter control energy efficiency compactness flexible design phased installation piping design program performance data retrieval .

  4. 10hp (28kW) – inverter driven 10hp (28kW) – fixed speed 8hp (22.4kW) – inverter driven 8hp (22.4kW) – fixed speed 6hp (16kW) – fixed speed .

  5. .

  6. 8-46hp capacity Cooling capacity from 8hp . . . . . 13 (maximum) Connected hp (maximum) 10.8hp Cooling Capacity (nominal) 22.4kw connected to ….. 8hp Inv

  7. 8-46hp capacity up to 46hp . . . . . . . . 40 (maximum) Cooling Capacity (nominal) 128.8kw Connected hp (maximum) 62.1hp 10hp Inv 10hp Fix 10hp Fix 8hp Fix 8hp Fix

  8. Maximum connected horsepower? The selected capacity of indoor units may exceed the horsepower of the outdoor unit(s) by a maximum ratio of 1 to 1.35 or135%

  9. MMS indoor unit PCB – capacity adjustment SW08

  10. Capacity adjustment Capacity code (horsepower) SW 08 ON ON ON ON 0.50 OFF OFF OFF OFF 1 2 3 4 Indoor unit capacity 1.40kW from . . . . . . .

  11. Capacity adjustment Capacity code (horsepower) SW 08 ON ON ON ON 5.00 OFF OFF OFF OFF 1 2 3 4 Indoor unit capacity to . . . . . . . 14.00kW

  12. Indoor unit range and capacities 2 3 4 5 • MM-U56 • MM-U80 • MM-U112 • MM-U140 • 4-way cassette 1 1.5 2 • MM-TU28 • MM-TU42 • MM-TU56 • 2 way cassette 1 • MM-SB28 • Slim duct 4 2 3 5 • MM-B112 • MM-B140 • MM-B56 • MM-B80 • Duct 1.5 2 3 4 5 • MM-C42 • MM-C112 • MM-C56 • MM-C80 • MM-C140 • Ceiling 1.5 2 3 • MM-K42 • MM-K56 • MM-K80 • Wall 2 3 • MM-S80 • MM-S56 • Low wall 1 1.5 2 3 • MM-N28 • MM-N42 • MM-N56 • MM-N80 • Chassis

  13. Inverter control + energy efficiency inverter speed increases and is controlled to meet demand 100% 50% 54% . . . fixed speed compressor starts Fixed speed Inverter 4% if demand is still greater than 50% inverter slows to 4% capacity and . . . Inverter compressor starts at 4% . . . . and if demand is 50% or greater runs up to full speed (or less if demand is >50%)

  14. 2 in 1 compressor Windings thermostat terminals Motor terminals Discharge pipe Discharge pipe Compressor scroll Inverter compressor motor Fixed speedcompressor motor Oil reservoir Crankcase heater in fixed speed models

  15. Inverter control + energy efficiency Indoor unit – cooling mode Temperature sensors Refrigerant pipe connections Pulsed modulating valve Pressure sensor

  16. Inverter control + energy efficiency PMV (Pulsed Modulating Valve) Maintains suction superheat at 6º Temperature sensor measures suction gas temperature Pressure sensor measures refrigerant pressure and converts it to saturated (evaporating) temperature Suction gas temperature minus evaporating temperature equals superheat High superheat – PMV opens Low superheat – PMV closes

  17. Inverter control + energy efficiency Outdoor unit – heating mode Pulsed Modulating Valves Fully open in cooling mode Modulating in heating mode (for superheat control)

  18. Compact Typical 30hp installation 3010 790 Actual footprint = 2.38m2 (incl. servicing area = 4.82m2) Total weight 270 x 3 = 810kgs

  19. New bell mouth design New fan design Intelligent Power Drive Unit (IPDU) 4 way air inlet design Separate housing for coil and mechanical assemblies 2 in 1 Compressor Suction accumulator System maintenance slider Pulsed Modulating Valves

  20. Noise level at maximum speed ………. 56 db(A) 50 db(A) 42 db(A) 10m 4m 2m ……… one of the quietest VRF units on the market

  21. Easy to install Oil balance pipe = 3/8” Single gas & liquid pipes Header T Joint Sized for the total capacity downstream Y Joint Capped for future use

  22. 30m 50m (outdoor higher) 30m (outdoor lower) 100m 250m Flexible design Maximum lift between outdoor and indoor units Maximum vertical separation between indoor units Longest single pipe run Maximum total pipe run

  23. Phased installation 1st. branch after outdoor units X X Shut-off valves Note: Size pipework to take account of future units X Shut-off valves X X X X X

  24. Refrigeration circuits • PD • Outdoor fan control (INV) • Stops compressor 1 @ 384 psig • Stops compressor 2 @ 399 psig • Locks out system @ 406 psig • Outdoor fan • Controlled by PD • TE • Outdoor fan control (FIX) • Defrost control • HP SW (both) • Locks system @ 479 psig • PS • Locks out system @ 3 psig TOSHIBA

  25. Capacity control • PMV • Flow control through indoor unit • SV42 • Balances prior to compressor 2 starting • PMV3 • Evaporator bypass • TD1/2 > 110ºC • TS > 20ºC • SV2 • Balance during off cycle TOSHIBA

  26. Coolingcycle • PD • Controls INV outdoor fans • PMV 1 & 2 • Fully open • TE • Controls FIX outdoor fans • Reversing valve • De-energised • PG • Provides saturation condition for superheat control TOSHIBA

  27. Heating cycle • PD • INV outdoor fan control • PMV 1 & 2 • Refrigerant flow control into evaporator • TE • FIX outdoor fan control • Reversing valve • Energised – except at defrost • PS • Provides saturation condition for superheat control

  28. Modular Multi System – Oil Management SV3C Pressurises oil management system TK1 Monitors flow of discharge vapour TK3 Monitors oil dilution TK2 - Monitors flow of oil out of oil vessel At the start of an oil check a record is made of the temperature at TK1, TK2 & TK3 for reference SV2 – (if in cooling mode) Adds hot gas to c/case if: TK3 < 2ºC Fan speed <20% SV3A - Adds oil to balance pipe

  29. Modular Multi System – Oil Management Toshiba has developed an oil management system for its Modular Multi outdoor units which ensures that each compressor within the Modular Multi system operates with the optimum oil charge thus increasing compressor reliability and operating efficiency.  The oil management system is time-controlled. The first check is carried out after one hour’s operation and every 30 minutes thereafter assuming that a satisfactory oil level has been determined. The temperatures measured by sensors TK1, TK2 and TK3 are stored for reference .

  30. Modular Multi System – Oil Management When an oil check is initiated solenoid valve SV3C is energised (opened) for 15 seconds and hot (discharge) gas flows towards the oil tank past sensor TK1  Solenoid valve SV3A is energised allowing oil to flow past sensor TK2 into the compressor suction pipe. If the temperature measured at TK2 is less than that measured at TK1 it is assumed that the oil tank (and therefore the compressor) contains sufficient oil and the oil check is terminated. If the temperature measured at TK2 is the same as that measured at TK1 it is assumed that the oil tank - and therefore the compressor- is empty. .

  31. Modular Multi System – Oil Management If the tank is empty an ‘A1’ judgement is made. An ‘A0’ judgement is made if the tank contains sufficient oil. [Refer to Page 105 of the Service Manual for further details.] In the case of an ‘A1’ judgement the system does not lock out but reschedules the next oil check after 5 minutes. If, during this 10-minute period the low oil level indication self-cancels, the system will continue to operate and carry out the next oil level check after 30 minutes. If the ‘A1’ judgement remains for a further 17 x 5 minute cycles the system will shut down and a D7 fault code will be displayed at the faulty outdoor unit. .

  32. Modular Multi System – Oil Management Solenoid valve SV3A on the unit from which oil is to be recovered and solenoid valve SV3B on the unit which is demanding oil are both energised for 15 seconds allowing oil at discharge pressure to pass from the donor unit into the suction pipe of the recipient unit. If there is no other unit from which oil can be recovered the unit indicating a low oil level will shut down. .

  33. Modular Multi Piping Design Program

  34. Piping Design Program A program designed for . . . . . . . . . . System selection Pipework configurations Branch kit selection Refrigerant charge calculations Job pricing .

  35. Piping Design Program Click on the appropriate button . . . . . .

  36. Piping Design Program

  37. Piping Design Program

  38. Piping Design Program

  39. Piping Design Program

  40. Piping Design Program

  41. Piping Design Program

  42. Piping Design Program

  43. Piping Design Program

  44. Piping Design Program

  45. Piping Design Program

  46. Piping Design Program

  47. Piping Design Program . . . . . . . a working example

  48. What are the ‘rules’ for installation?

  49. Installation rules All pipes must be of refrigeration quality, hard-drawn or soft copper All copper used must be new and previously unused Pipes must be cut using a pipe cutter – not a hacksaw!

  50. Installation rules All cut pipe lengths must be capped after use If in doubt over pipe quality – don’t use it!

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