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SPLIT-TYPE AIR CONDITIONERS
SERVICE TECHNICAL GUIDE
Models
MSC-GE•VB -
MS-GD•VB -
MS-GE•VB -
MSH-GD•VB -
MSH-GE•VB -
MSZ-GC•VA -
MSZ-HC•VA(B) -
MSZ-CHC•VA -
MSZ-FD•VA(S) -
MSZ-GE•VA -
MSZ-CGE•VA -
MLZ-KA•VA -
CONFIDENTIAL
(FOR INTERNAL USE ONLY)
E
· MU-GD•VB -
E
· MU-GE•VB -
E
· MUH-GD•VB -
E
· MUH-GE•VB -
E
· MUZ-GC•VA(H) -
E
· MUZ-HC•VA(B) -
E
E
· MUZ-FD•VA(H)(BH) -
E
· MUZ-GE•VA(H) -
E
E
E
CONTENTS
1. MSC/MS/MSH MICROPROCESSOR CONTROL · 4
2. MSZ/MLZ MICROPROCESSOR CONTROL ·······11
Revision D:
•MSC-GE·VB-
, MS-GE·VB-
E
GE·VB-
, MUZ-FD50VA -
E
50VA -
and MSZ-CGE42/50VA -
E
been added.
Please void OBT17 REVISED EDITION-C.
No. OBT17
REVISED EDITION-D
E
E
E
E
, MSH-
E
, MSZ-GE42/
E
have
E
E
E
E
E
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Table of Contents
Related Manuals for Mitsubishi Electric MSC-GE-VB – E
Summary of Contents for Mitsubishi Electric MSC-GE-VB – E
- Page 1 Revision D: •MSC-GE·VB- , MS-GE·VB- , MSH- GE·VB- , MUZ-FD50VA - , MSZ-GE42/ 50VA - and MSZ-CGE42/50VA - have SPLIT-TYPE AIR CONDITIONERS been added. Please void OBT17 REVISED EDITION-C. No. OBT17 REVISED EDITION-D SERVICE TECHNICAL GUIDE Models MSC-GE•VB - MS-GD•VB - ·...
- Page 2 Revision A: • MSZ-FD•VA - has been added. Revision B: •MS-GD•VB - and MSH-GD•VB - have been added. Revision C: • MSZ-FD50VA - , MSZ-GE•VA - , MSZ-CHC•VA - and MSZ-CGE•VA - have been added. Revision D: • MSC-GE·VB- , MS-GE·VB- , MSH-GE·VB- , MUZ-FD50VA - , MSZ-GE42/50VA -...
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Page 3: Table Of Contents
1. MSC/MS/MSH MICROPROCESSOR CONTROL· ······························································································· 4 Indoor unit models Outdoor unit models MSC-GE20VB MSC-GE25VB MSC-GE35VB MS-GD80VB MU-GD80VB MS-GE50VB MU-GE50VB MSH-GD80VB MUH-GD80VB MSH-GE50VB MUH-GE50VB 1-1. COOL OPERATION ····································································································································· 4 1-2. DRY OPERATION ········································································································································ 5 1-3. HEAT OPERATION ······································································································································ 5 1-4. INDOOR FAN MOTOR CONTROL ·············································································································· 8 1-5. -
Page 4: Msc/Ms/Msh Microprocessor Control
MSC/MS/MSH MICROPROCESSOR CONTROL Difference between room 1-1. COOL ( ) OPERATION temperature and set tem- 1. Thermostat control (MSC-GE20/25/35VB) perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : 0.3°C or more················································ON Room temperature minus set temperature : less than -0.3°C············································OFF °C... -
Page 5: Dry Operation
1-2. DRY ( ) OPERATION Set temperature and initial room temperature in DRY mode 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. - Page 6 2. Indoor fan speed control (1) In AUTO the fan speed Difference between room (MSC-GE20/25/35VB) Indoor fan speed at set speed by FAN SPEED CONTROL button. temperature and set tem- perature during operation Initial temperature difference Fan speed Set temperature minus room temperature: 1.7°C or more ················································· High Set temperature minus room temperature: between 1 and 1.7°C ·································...
- Page 7 4. High pressure protection (MUH-GD80VB, MUH-GE50VB) During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor for excess rise protection of compressor discharge pressure. • Outdoor fan When the temperature of indoor coil thermistor goes to 55°C or more, the outdoor fan is turned OFF. When the temperature of indoor coil thermistor becomes 52°C or less, the outdoor fan is turned ON.
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Page 8: Indoor Fan Motor Control
1-4. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed- back the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low), the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency. - Page 9 (2) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger (Tp ( 1) SWING operation makes you feel cooler than set temperature.
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Page 10: Expansion Valve Control (Lev Control)
1-6. EXPANSION VALVE CONTROL (LEV CONTROL) (MU-GD80VB, MUH-GD80VB) LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Control range Minimum: 54 pulse, Maximum: 500 pulse Drive speed 30 ~ 90 pulse/second Opening set The setting is always in opening direction. (To close LEV, it is closed to the pulse smaller than the one set finally. -
Page 11: Msz/Mlz Microprocessor Control
MSZ/MLZ MICROPROCESSOR CONTROL 2-1. COOL ( ) OPERATION 1. Thermostat control (MSZ) Thermostat is ON or OFF by difference between room temperature and set temperature. Room temperature minus Room temperature minus Thermostat set temperature (Initial) set temperature (During operation) -1°C or more Less than -1°C -1°C -0.75°C... -
Page 12: Dry Operation
2-2. DRY ( ) OPERATION Set temperature and initial room temperature in dry mode 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. - Page 13 (2) Cold air prevention control When the compressor is not operating, ( ) if the temperature of room temperature thermistor is less than 19°C, the fan stops. ) if the temperature of room temperature thermistor is 19°C or more and ( ) if the temperature of indoor coil thermistor is less than 0°C, the fan stops.
- Page 14 Time chart of defrosting in HEAT mode (reverse type) <Indoor unit> Horizontal Set position Set position 39 °C ) Horizontal (Temperature of indoor coil thermistor Horizontal vane Indoor fan Very Low (Temperature of indoor coil thermistor > 18 °C) Set speed Set speed seconds <Outdoor unit>...
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Page 15: Auto Change Over
2-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ-GC/FD/GE/CGE, MLZ-KA) Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. 1. Mode selection (1) Initial mode At first, indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature. Following the conditions below, operation mode is selected. -
Page 16: Drain Pump/Float Sensor Control
<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 at starting of this operation, next downward blow time is decided. After the downward blow has been finished, next horizontal blow time is decided. For initial 10 minutes, the swing operation is performed in table G ~ H for quick cooling. -
Page 17: Inverter System Control
2-8. INVERTER SYSTEM CONTROL 2-8-1. Inverter main power supply circuit MUZ-GC, HC, FD25/35, GE CURRENT DIODE TRANSFORMER REACTOR MODULE1 NOISE RESISTOR POWER SMOOTHING FILTER SUPPLY CAPACITOR CIRCUIT RELAY COMPRESSOR SWITCHING POWER DIODE TRANSISTOR MODULE2 BOOSTER CHOPPER CIRCUIT Function of main parts NAME FUNCTION INTELLIGENT POWER MODULE (IPM) - Page 18 2-8-2. Outline of main power supply circuit MUZ-GC, HC, FD25/35, GE 1. At the start of operation Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup. To prevent rush current from running into the circuit when power supply is turned ON, RESISTOR is placed in sub circuit. 2.
- Page 19 MUZ-FD50 1. At the start of operation Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup. To prevent rush current from running into the circuit when power supply is turned ON, RESISTOR are placed in sub circuit. 2.
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Page 20: Operational Frequency Control Of Outdoor Unit
2-8-5. Control Method of Rotation Times Sine wave control makes the current transformers conduct real time detection of the value of the current running into the mo- tor, locates the rotor position from the detected value, and decides if voltage should be impressed and if frequency should be changed. -
Page 21: Pre-Heat Control
2-10. PRE-HEAT CONTROL MUZ-GC, HC, FD, GE 1. Outline Compressor is energized to improve the start-up of compressor at a low outside temperature even when compressor is stopped. 2. Pre-heat control Compressor Pre-heat control 20 °C Outside temperature 30 minutes 1 hour Pre-heat control ON condition (1) Compressor is not operating. -
Page 22: Expansion Valve Control/Lev Control
2-11. EXPANSION VALVE CONTROL/LEV CONTROL (MUZ-GC/FD/GE HC35) (1) Outline of LEV control The LEV basic control is setting of LEV opening degree to the standard opening degrees set for each operational fre- quency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air condi- tioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temperature (Shell temperature) of the compressor, developing the unit’s performance. - Page 23 (3) Control data Operational frequency of the compressor (Hz) Reference value of target discharge temperature (COOL/HEAT °C) In COOL operation, the two indoor coil Applied model thermistors (one main and one sub) sense temperature ununiformity (super heat) MUZ-GC25 54/36 59/46 65/55 70/63 75/70...
- Page 24 HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2007 MITSUBISHI ELECTRIC CO.,LTD Distributed in Dec. 2008. No. OBT17 REVISED EDITION-D 6 Distributed in Aug. 2008. No. OBT17 REVISED EDITION-C 5 Distributed in Apr. 2008. No. OBT17 REVISED EDITION-B 7 Distributed in Aug.