Table Of Contents - Mitsubishi Electric MSC-GE-VB Service Manual

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Service technical manual (24 pages)

Table of Contents

2. MSZ/MLZ MICROPROCESSOR CONTROL······································································································ 11

Indoor unit models

MSZ-GC22/25/35VA

MSZ-HC25VA

MSZ-CHC25/35VA

MSZ-FD25/35/50VA(S)

MSZ-GE22/25/35/42/50/60/71VA

MSZ-CGE22/25/35/42/50VA

MSZ-EF22/25/35/42/50VEW

MSZ-EF22/25/35/42/50VEB

MSZ-EF22/25/35/42/50VES

MSZ-SF15/20VA

MLZ-KA25/35/50VA

2-1. COOL OPERATION ··································································································································· 11

2-2. DRY OPERATION ······································································································································ 12

2-3. HEAT OPERATION ···································································································································· 12

2-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION············································································· 15

2-5. OUTDOOR FAN MOTOR CONTROL ········································································································ 15

2-6. AUTO VANE OPERATION ························································································································· 15

2-7. DRAIN PUMP/FLOAT SENSOR CONTROL ····························································································· 16

2-8. INVERTER SYSTEM CONTROL ··············································································································· 17

2-9. OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT ···························································· 21

2-10. PRE-HEAT CONTROL ····························································································································· 21

2-11. EXPANSION VALVE CONTROL/LEV CONTROL ··················································································· 22

2-12. STANDBY POWER CONTROL ··············································································································· 23

NOTE: As for the MXZ-A type models or MU/MUH-GA type models, refer to the appropriate service technical

guide as well as this service technical guide.

3. MXZ MICROPROCESSOR CONTROL ·············································································································· 24

Outdoor unit models

MXZ-2B30VA MXZ-3B68VA MXZ-3C54VA MXZ-5C100VA

MXZ-2B40VA MXZ-4B71VA MXZ-3C68VA MXZ-6C120VA

MXZ-2B52VA MXZ-4B80VA MXZ-4C71VA

MXZ-3B54VA MXZ-5B100VA MXZ-4C80VA

3-1. INVERTER SYSTEM CONTROL ··············································································································· 24

3-2. EXPANSION VALVE CONTROL (LEV CONTROL) ·················································································· 28

3-3. OPERATIONAL FREQUENCY RANGE ···································································································· 34

3-4. HEAT DEFROSTING CONTROL ··············································································································· 36

3-5. DISCHARGE TEMPERATURE PROTECTION CONTROL ······································································ 36

3-6. REFRIGERANT RECOVERY CONTROL ON HEATING ·········································································· 36

3-7. OUTDOOR FAN CONTROL ······················································································································ 37

3-8. PRE-HEAT CONTROL ······························································································································· 38

3-9. COOL OPERATION ··································································································································· 38

3-10. DRY OPERATION ······································································································································ 38

3-11. HEAT OPERATION ···································································································································· 39

MSZ-HC35VA(B)

Outdoor unit models

MUZ-GC25/35VA(H)

MUZ-HC25VA

MUZ-FD25/35VA(H)(BH) MUZ-FD50VABH

MUZ-GE25/35/42/50/60/71VA(H)

MUZ-EF25/35/42/50VE

MUZ-EF25/35VEH

MUZ-HC35VA(B)