Instruction/ maintenance manual of the product MS-AWA Mitsubishi Electronics
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MS-A•W A · MU-A•W A MSZ-A•NA · MUZ-A•NA · MUZ-A•NA - MSY -A•NA · MUY -A•NA · MXZ-A•NA U SER VICE TECHNICAL GUIDE CONTENTS 1. MS MICROPROCESSOR CONTROL ··················3 2. MSZ,MSY MICROPROCESSOR CONTROL ·······6 3.
1. MS MICROPROCESSOR CONTROL ···························································3 Indoor unit models Outdoor unit models MS-A09W A MU-A09W A MS-A12W A MU-A12W A 1-1.
3 MS MICROPROCESSOR CONTROL 1 1-1. COOL ( ) OPERA TION MS-A09W A MU-A09W A MS-A12W A MU-A12W A 2. Indoor fan speed control Indoor fan operates continuously at the set speed by F AN SPEED CONTROL button regardless of the thermostat’s OFF-ON. In AUTO the fan speed is as follows.
4 -1.8 deg. -1.3 deg. 1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature. Initial temperature difference Thermostat Room temperature minus set temperature : -1.
5 1-3. AUT O V ANE OPERA TION 1. Horizontal vane <SWING operation> In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided.
MSZ,MSY MICROPROCESSOR CONTROL 6 2 2-1. COOL ( ) OPERA TION MSZ-A09NA MSY -A15NA MUZ-A09NA MUY -A15NA MSZ-A12NA MSY -A17NA MUZ-A12NA MUY -A17NA MSZ-A15NA MSY -A24NA MUZ-A15NA MUY -A24NA MSZ-A17NA MUZ-A17NA MSZ-A24NA MUZ-A24NA 2.
7 Set temperature is as shown on the right chart. The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room tem- perature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.
8 (2) Cold air prevention control MSZ-A09/12/15/17 1 When the compressor is not operating, ( 1 ) if the temperature of room temperature thermistor R T1 1 is less than 66°F , the fan stops. ( 2 ) if the temperature of room temperature thermistor R T1 1 is 66°F or more and ( 1 ) if the temperature of RT12 is less than 32°F , the fan stops.
9 T ime chart of defrosting in HEA T mode (reverse type) set position set speed set position set speed Indoor fan Compressor normal Outdoor fan R.V . coil (21S4) OFF (COOL) OFF Maximum frequency horiz.
10 (3) Indoor fan control/ V ane control As the indoor fan speed and the horizontal vane position depend on the selected operation mode, when the operation mode changes over , they change to the exclusive ones. 2-5. OUTDOOR F AN MOTOR CONTROL Fan speed is switched according to the compressor frequency .
11 <SWING operation> In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided.
12 2-7. INVERTER SYSTEM CONTROL 2-7-1. MUZ-A09/12/15/17 MUY -A15/A17 2-7-1-1. Inverter main power supply circuit POWER P .C. BOARD Power supply INVERTER P .
13 4. Intelligent power module IPM consists of the following components · IGBT (x6) : Converts DC waveform to three-phase AC waveform and outputs it. · Drive Circuit : Drives transistors. · Protection circuit : Protects transistors from overcurrent.
14 SYMBOL IPM CB1~3 CT1~2 CT61 L PFC R64A, R64B X64 NAME INTELLIGENT POWER MODULE SMOOTHING CAP ACITOR CURRENT TRANSFORMER CURRENT TRANSFORMER REACTOR POWER F ACTOR CONTROLLER CURRENT -LIMITING RESISTOR RELA Y FUNCTION It supplies three-phase AC power to compressor.
15 Rotor Rotor Position Signal Permanent magnet is embedded. Necessary DC Motor Excited by magnetic field of stator Unnecessary AC Motor 2-7-4. Characteristics of sine wave control in case of brushles.
16 w The operation frequency in COOL mode is restricted the upper limit frequency after 1 hour as shown below for dew prevention. It is rated frequency or less.
17 standard specification 2-9. EXP ANSION V AL VE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor .
18 (2) T ime chart OFF T ime T ime ON Operational frequency of the compressor Commanded to open Standard opening degree Opening degree is corrected according to discharge temperature.
19 In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (super heat) at the heat exchanger , and when temperature difference have developed, the ind.
MXZ MICROPROCESSOR CONTROL 20 3 3-1. INVERTER SYSTEM CONTROL MXZ-2A20NA MXZ-3A30NA SYMBOL IPM CB1~3 CT1~2 CT61 L PFC R64A, R64B X64 NAME INTELLIGENT POWER MODULE SMOOTHING CAP ACITOR CURRENT TRANSFORMER CURRENT TRANSFORMER REACTOR POWER F ACTOR CONTROLLER CURRENT -LIMITING RESISTOR RELA Y FUNCTION It supplies three-phase AC power to compressor.
21 4. Power transistor module IPM consists of the following components. · Power Transistors (x6) : Converts DC waveform to three-phase AC waveform and outputs it. · Drive Circuit : Drives transistors. · Protection circuit : Protects transistors from over current.
22 3-2. EXP ANSION V AL VE CONTROL (LEV CONTROL) Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.
23 The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode. w In COOL mode, the two indoor coil thermistor (one main and one sub) sense temperature ununiformity (super .
24 Capacity code Indoor unit 4 09 7 12 9 15 10 17 12 24 Standard opening (pulse) 01 02 03 04 05 06 07 08 COOL LEV Opening(code) HEA T 126 140 130 146 134 150 138 170 140 180 142 200 182 224 228 244 09.
25 MXZ-3A 1 Discharge temperature 2 Each correction • (Each gas pipe temperature thermistor - Minimum gas pipe temperature thermistor) w 1 • (Main indoor coil thermistor - Sub indoor coil thermistor) w 1 Perform this, when number of operation units is 2 units or more.
26 Correct the LEV opening according to the difference between target discharge temperature and discharge temperature. Discharge temperature (˚F) LEV opening correction (pulse) More than T arget disc.
27 3-3. OPERA TIONAL FREQUENCY RANGE Number of operating unit 1 2 Capacity code 1, 2, 3, 4 5, 6 7, 8 9, 10 1 1, 12 13, 14 15 or above 2, 3, 4, 5, 6, 7 8, 9, 10 1 1, 12, 13 14, 15, 16 17, 18, 19, 20, 21 22, 23, 24 or above Min. 20 20 20 20 20 20 30 30 30 30 30 30 COOL (Hz) Max.
New publication, effective Apr . 2006 Specifications subject to change without notice. C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Apr .
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