Super Multi System - Toshiba

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68 Valve and sensor function and operation Multi Controller sensor operation Sensor and switch operation Temperature According to a difference between the evaporator outlet temperature and sensor (ThA, B, C, D) saturation temperature (ThX): a. Performs superheat control. (cooling operation) b. Determines the degree of opening of PMV 2. (cooling-dominant operation) Outdoor unit sensor and switch operation Discharge pressure Determines the frequency of the inverter compressor and the ON/OFF status of sensor D.O.L. compressor. Controls the outdoor unit fan operation. Controls the hot gas bypass SV2. Controls the changeover from outdoor unit main heat exchanger to sub heat exchanger. Suction temperature Controls the degree of opening of PMV 1. sensor (ThS) Stops operation when ThS > 40°C for 10 minutes (Fault code [A7]). Discharge temperature Controls the degree of opening of PMV 1. sensor (ThD1, ThD2) Stops operation when the discharge temperature > 130°C (Fault code [A6]). Outdoor unit heat Controls the defrost operation. exchanger sensor (TE) Controls the outdoor unit fan operation. Heating operation Controls the high pressure release valve SV1. Outdoor temperature Controls the hot gas bypass SV2. sensor (ThO) Controls the outdoor unit fan operation. Prevents heating operation when ThO > 25°C. High pressure switch Stops operation when Pd > 30 kgf/cm2G. Low pressure switch Stops operation when suction pressure < 0.25 kgf/cm2G: After 30 seconds for cooling operation. After 10 minutes for heating operaton. The low pressure switch is ignored during defrost operation.
Airtight test Refrigerant pipe installation Leak test Carry out an airtight test after the refrigerant piping is complete. For an airtight test, connect a nitrogen gas bottle as shown, and apply pressure (use oxygen-free nitrogen, OFN). The pressure test must be completed before supplying power to ensure that the Multi Controller PMVs (pulse modulating valves) are open. The test must be completed with the indoor units, Multi Controllers and outdoor unit connected. Be sure to carry out the test from the service ports of the packed valves at the discharge gas, liquid and suction gas side. Keep all of the valves at discharge gas, liquid and suction gas sides fully closed. Nitrogen may enter the cycle of the outdoor unit. Therefore, retighten the valve rod before applying pressure. (For all valves.) For each refrigerant line, apply pressure gradually at the discharge gas, liquid and suction gas sides. Never use oxygen, or a flammable noxious gas. Low pressure Service port at gas discharge side Service port at liquid side Detailed drawing of packed valve To manifold Service port at gas suction side Brazed Flare connection Flare connection To detect a large leakage Step 1: 0.3 MPa (3 kg/cm 2 G) Apply pressure for 3 minutes or more Step 2: 1.5 MPa (15 kg/cm 2 G) Apply pressure for 3 minutes or more To detect a fine leakage Step 3: 3.0 MPa (30 kg/cm 2 G) Apply pressure for 24 hours Packed valve fully closed (gas suction side) Inverter outdoor unit Service port Service port Packed valve fully closed (liquid side) Copper pipe ø 6.4 Packed valve fully closed (gas discharge side) gauge High pressure gauge Copper pipe ø 6.4 Gauge manifold Regulator Nitrogen gas Check for a reduction in pressure. If there is no reduction in pressure this is acceptable. If there is a reduction in pressure check for a leakage. (Note: If there is a difference of ambient temp. between when the pressure was applied and 24 hours later, then pressure could change by approx. 0.01 MPa (0.1 kg/cm 2 G) - so correct the pressure change. 69
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Super Multi System HFC R407C A90-02
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4 Introduction Precautions Please r
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Components - 3 pipe system 1. Outdo
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8 Introduction Super multi system b
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10 Introduction Components Setting
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12 Parts specification Outdoor unit
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14 Parts specification Outdoor unit
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MAR-F105HTM8-PE Dimensional drawing
Page 18 and 19: MAR-F105HTM8-PE 18 Wiring diagrams
Page 20 and 21: 20 Wiring diagram Multi Controllers
Page 22 and 23: 22 Refrigeration piping schematic d
Page 24 and 25: 24 Refrigeration piping schematic d
Page 26 and 27: 26 Diagnostic procedure Outdoor uni
Page 28 and 29: 28 Diagnostic procedure Outdoor uni
Page 30 and 31: 9. Outdoor unit - pressure sensor d
Page 32 and 33: 32 Diagnostic procedure Multi Contr
Page 34 and 35: 34 Fault code display Self-diagnost
Page 36 and 37: 04 No communication signal between
Page 38 and 39: 38 Is 4-way valve coil connector co
Page 40 and 41: 40 Is drain pump connected? Does fl
Page 42 and 43: 42 Troubleshooting Diagnostic proce
Page 44 and 45: Check code Status of air conditione
Page 46 and 47: Check code Operation cause [21] 1.
Page 48 and 49: Check code Operation cause [E5] 1.
Page 54 and 55: Check code [A0] Operation cause Dis
Page 58 and 59: 58 C � Does heating indoor fan op
Page 64 and 65: 64 Control features Outdoor unit/Mu
Page 66 and 67: 66 Valve and sensor function and op
Page 70 and 71: Leak position check 70 Refrigerant
Page 72 and 73: Additional refrigerant One Multi Co
Page 74 and 75: 74 Exploded view and service parts
Page 80: www.toshiba-aircon.co.uk MADE IN UK
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Super Multi System - Toshiba

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