Mitsubishi Electronics MUZ-ANA - U, MSY-ANA, MUZ-ANA, MUZ-FDNA - U, MUY-ANA User Manual

...

Revision B:

• MXZ-2A20NA-

MSZ-D and MSY-D have been added.

Please void OBT16 REVISED EDITION-A.

, MXZ-4A36NA, MSZ-FD,

REVISED EDITION-B

SERVICE TECHNICAL GUIDE

Wireless type Models

No. OBT16

MS-A•WA MSZ-A•NA

· MU-A•WA

· MUZ-A•NA

· MUZ-A•NA MSY-A•NA · MUY-A•NA MSZ-FD•NA

MSZ-D•NA

· MUZ-D•NA -

MSY-D•NA

Inverter-controlled multi system type Models

· MUZ-FD•NA

· MUZ-FD•NA -

· MUZ-D•NA

· MUY-D•NA

· MXZ-A•NA

CONTENTS

1. MS MICROPROCESSOR CONTROL ··················4

2. MSZ, MSY MICROPROCESSOR CONTROL ······7

3. MXZ MICROPROCESSOR CONTROL ·············· 21

Revision A:

• MXZ-3A30NA-

Revision B:

• MXZ-2A20NA-

has been added.

, MXZ-4A36NA, MSZ-FD, MSZ-D and MSY-D have been added.

1. MS MICROPROCESSOR CONTROL ··························································· 4

Indoor unit models Outdoor unit models

MS-A09WA MU-A09WA MS-A12WA MU-A12WA

1-1. COOL OPERATION ···············································································4 1-2. DRY OPERATION ··················································································4 1-3. AUTO VANE OPERATION ·····································································6

2. MSZ, MSY MICROPROCESSOR CONTROL ···············································7

Indoor unit models Outdoor unit models

MSZ-A09NA MSZ-FD09NA MUZ-A09NA MUZ-FD09NA MSZ-A12NA MSZ-FD12NA MUZ-A12NA MUZ-FD12NA MSZ-A15NA MSZ-D30NA MUZ-A15NA MUZ-D30NA MSZ-A17NA MSZ-D36NA MUZ-A17NA MUZ-D36NA MSZ-A24NA MSY-D30NA MUZ-A24NA MUY-D30NA MSY-A15NA MSY-D36NA MUY-A15NA MUY-D36NA MSY-A17NA MUY-A17NA MSY-A24NA MUY-A24NA

2-1. COOL OPERATION ··············································································7 2-2. DRY OPERATION ·················································································8 2-3. HEAT OPERATION ···············································································8 2-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION ·····················10 2-5. OUTDOOR FAN MOTOR CONTROL ·················································11 2-6. AUTO VANE OPERATION ··································································11 2-7. INVERTER SYSTEM CONTROL ························································12 2-8.

OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT ·····17

2-9. EXPANSION VALVE CONTROL (LEV CONTROL) ···························18

3. MXZ MICROPROCESSOR CONTROL ·······················································21

Outdoor unit models

MXZ-2A20NA MXZ-3A30NA MXZ-4A36NA

3-1. INVERTER SYSTEM CONTROL ·························································21 3-2. EXPANSION VALVE CONTROL (LEV CONTROL) ···························· 23 3-3. OPERATIONAL FREQUENCY RANGE ·············································· 29 3-4. HEAT DEFROSTING CONTROL ························································· 3-5.

DISCHARGE TEMPERATURE PROTECTION CONTROL ·······················30 3-6. OUTDOOR FAN CONTROL ································································ 3-7. PRE-HEAT CONTROL ········································································· 3-8.

COOL OPERATION ····················································································31 3-9.

DRY OPERATION ·································································· BACK COVER 3-10. HEAT OPERATION ···························································

BACK COVER

30 30

MS MICROPROCESSOR CONTROL

MS-A•WA MU-A•WA

1-1. COOL ( ) OPERATION

1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature

Room temperature minus

Thermostat

set temperature (Initial)

ON -1.8 °F or more

-1.8 °F

OFF less

than

2. Indoor fan speed control

Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat’s OFFON. In AUTO the fan speed is as follows.

Fan speed

Room temperature minus

set temperature (Initial) High 3.1 °F or more Med. between 1.8 and 3.1 °F Low less than 1.8 °F

3. Coil frost prevention

Temperature control When the indoor coil thermistor RT12 reads 37 °F or below the coil frost prevention mode starts immediately. However, the coil frost prevention doesn’t work for 5 minutes since the compressor has started. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if the indoor coil thermistor still reads below 37 °F, this mode is prolonged until the indoor coil thermistor reads

over 37 °F.

Time control When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes. a. Compressor has been continuously operating. b. Indoor fan speed is Low or Med. c. Room temperature is below 79 °F. When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the

beginning.

Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 79 °F.

However, when two of the above conditions (b. and c.) are satisfied again. Time accumulation is resumed.

Room temperature minus set temperature (During operation)

-1.8 °F

-1.3 °F

Room temperature minus set temperature (During operation)

5.4 °F

1.8 °F

3.1 °F

Operation chart Example

Compressor Outdoor fan

Indoor fan

ON OFF

( Continuously at set speed)

1-2. DRY ( ) OPERATION

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 temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.

Set temperature and

°F

initial room temperature in dry mode

Set temperature

50 59 68 77 86 95

Initial room temperature

°F

1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature.

Room temperature minus

Thermostat

set temperature (Initial)

ON -1.8 °F or more OFF less

than

-1.8 °F

2. Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. When thermostat OFF (compressor OFF), fan speed becomes Very Low. In AUTO the fan speed is as follows.

Room temperature minus

Fan speed

set temperature (Initial) High 3.1 F or more Med. between 1.8 and 3.1 F Low less than 1.8 F

3. The operation of the compressor and indoor/ outdoor fan

Compressor operates by room temperature control and time control. Set temperature is controlled to fall 4 °F from initial room temperature. Indoor fan and outdoor fan operate in the same cycle as the compressor.

•When the room temperature is 73 °F or over: When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

•When the room temperature is under 73 °F. When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

Room temperature minus set temperature (During operation)

-1.8 °F

-1.3 °F

Room temperature minus set temperature (During operation)

4.5 F

1.8 F

3.1 F

Operation time chart Example

Thermostat

OFF

Indoor fan

OFF

Outdoor fan Compressor

ON OFF

8 minutes

3 minutes

4 minutes

1 minute

4. Coil frost prevention

Coil frost prevention is as same as COOL mode. (2-1.3.) The indoor fan maintains the actual speed of the moment. However ,when coil frost prevention works while the compressor is not operating, its speed becomes the set speed.

1-3. AUTO VANE OPERATION

1. Horizontal vane

ECONO COOL (

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6 °F higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger (indoor coil thermistor). SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved. ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode.

<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. Then when 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. Also, after 10 minutes when the difference of set temperature and room temperature is more than 3.6 °F, the swing operation is performed in table D~H for more cooling. The air conditioner repeats the swing operation in various cycle as follows.

A 59 or less 2 23 B 59 to 63 5 20 C 63 to 64 8 17 D 64 to 68 11 14 E 68 to 70 14 11

F 70 to 72 17 8 G 72 to 75 20 5 H more than 75 23 2

) operation (ECONOmical operation)

Temperature of indoor

coil thermistor (°F)

Downward blow time

(second)

Horizontal blow time

(second)

MSZ,MSY MICROPROCESSOR CONTROL

MSZ-A•NA MSY-A•NA MUZ-A•NA MUY-A•NA MSZ-FD•NA MSY-D•NA MUZ-FD•NA MUY-D•NA MSZ-D•NA MUZ-D•NA

2-1. COOL ( ) OPERATION

1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature

Room temperature minus

Thermostat

ON -1.8 °F or more OFF less

2. Indoor fan speed control

Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat’s OFFON. In AUTO the fan speed is as follows.

MSZ-A MSY-A

Fan speed

High 3.1 °F or more Med. between 1.8 and 3.1 °F Low less than 1.8 °F

set temperature (Initial)

-1.8 °F

than

Room temperature minus set temperature (Initial)

Room temperature minus set temperature (During operation)

-1.8 °F

Room temperature minus set temperature (During operation)

1.8 °F

3.1 °F

-1.3 °F

5.4 °F

MSZ-FD MSZ-D MSY-D

3. Coil frost prevention

The compressor operational frequency is controlled to prevent the temperature of indoor heat exchanger from falling excessively. The compressor is turned OFF for 5 minutes when the temperature of indoor coil thermistor continues 37 °F or less for 5

minutes or more. The indoor fan maintains the actual speed of the moment.

4. Low outside temperature operation

If the outside temperature falls to 64 °F or less during operation in COOL mode, the unit will switch to the low outside temperature operation mode. <Operation> (1) Outdoor fan control

The outdoor fan rotation speed slows down to maintain sufficient cooling capacity. NOTE: Even when the unit is in the "thermostat-off" status under the low outside temperature operation mode, the out-

door fan rotation does not stop.

(2) Dew drop prevention

When the ambient temperature thermistor reads 10 °F (MUZ-A MUY-A MUZ-D MUY-D), -4 °F (MUZ-FD) or less, as coil frost or dew drop from indoor unit may occur, the compressor turns OFF with the outdoor fan ON for prevention of

them. (3) Outdoor temperature detecting control To detect the exact outdoor temperature in this mode, the compressor turns OFF but the outdoor fan stays ON for 3

minutes once 1 hour. If the outdoor temperature rises over 64 °F, the unit goes back to the normal COOL mode. If the

outside temperature stays below 64 °F, the unit continues to run in the low outside temperature operation mode.

Other protections work as well as in the normal COOL mode.

Fan speed

High 2.7 °F or more Med. between Low less than 1.8 °F

Room temperature minus set temperature (Initial)

1.8 and 2.7 °F

Room temperature minus set temperature (During operation)

5.4 °F

1.8 °F

2.7 °F

2-2. DRY ( ) OPERATION

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 temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.

Set temperature and

°F

initial room temperature in dry mode

Set temperature

50 59 68 77 86 95

Initial room temperature

°F

1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature.

Thermostat

Room temperature minus set temperature (Initial)

Room temperature minus set temperature (During operation)

ON -1.8 °F or more OFF less than

-1.8 °F

-1.3 °F

2. Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. When thermostat OFF (compressor OFF), fan speed becomes Very Low. In AUTO the fan speed is as follows.

Fan speed

Room temperature minus set temperature (Initial)

Room temperature minus

set temperature (During operation) High 3.1 F or more Med. between 1.8 and 3.1 F Low less than 1.8 F

1.8 F

4.5 F

3.1 F

3. Coil frost prevention

4. Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (2-1.4.)

2-3. HEAT ( ) OPERATION (MSZ)

1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature.

Thermostat

ON less than 3.6 °F OFF 3.6

2. Indoor fan speed control

(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.

In Auto the fan speed is as follows.

Fan speed

High Med. between 0.4 and 3.6 °F Low

Room temperature minus set temperature (Initial)

°F or more

Room temperature minus set temperature (Initial)

3.6 °F

or more

less than

0.4 °F

Room temperature minus set temperature (During operation)

3 °F

3.6 °F

Room temperature minus set temperature (During operation)

7.2 °F

0.4 °F

3.6 °F

3 °F

(2) Cold air prevention control

MSZ-A09/12/15/17 MSZ-FD MSZ-D

When the compressor is not operating,

(

) if the temperature of room temperature thermistor is less than 66 °F, the fan stops.

) if the temperature of room temperature thermistor is 66 °F or more and

(

) if the temperature of indoor coil themistor is less than 32 °F, the fan stops.

(

) if the temperature of indoor coil themistor is 32 °F or more, the fan operates at Very Low.

(

When the compressor is operating,

(

) if the temperature of indoor coil themistor is 104 °F or more, the fan operates at set speed.

) if the temperature of indoor coil themistor is less than 104 °F and

(

) if heating operation starts after defrosting, the fan stops.

(

) if the temperature of room temperature thermistor is 66 °F or less, the fan stops.

(

) if the temperature of room temperature thermistor is more than 66 °F, the fan operates at Very Low.

(

NOTE : When 3 minutes have passed since the compressor started operation, this control is released regardless of the

temperature of room temperature thermistor and indoor coil thermistor.

MSZ-A24

When the compressor is not operating,

) if the temperature of room temperature thermistor is 59 °F or less, or temperature of indoor coil thermistor is

(

less than 64 °F, the fan stops.

(

) if the temperature of room temperature thermistor is more than 59 °F, or temperature of indoor coil themistor is

more than 64 °F, the fan operates at Very Low.

When the compressor is operating,

) if the temperature of indoor coil themistor is 64 °F or more, the fan operates at set speed.

( (

) if the temperature of indoor coil themistor is less than 64 °F and

( ) if heating operation starts after defrosting, the fan stops. ( ) if the temperature of room temperature thermistor is 59 °F or less, the fan stops. ( ) if the temperature of room temperature thermistor is more than 59 °F, the fan operates at Very Low.

NOTE : When 3 minutes have passed since the compressor started operation, this control is released regardless of the

temperature of room temperature thermistor and indoor coil thermistor.

(3) Warm air control (MSZ-FD)

When the following any condition of (a. ~ c.) and the condition of are satisfied at the same time, warm air control works.

a.) Fan speed is used in MANUAL. b.) When cold air prevention has been released. c.) When defrosting has been finished.

When the temperature of indoor coil thermistor is less than 104 °F.

When warm air control works, the fan speed changes as follows to blow out warm air gradually.

Gradation of fan speed in initial

<Time condition> <Indoor fan speed> Less than 2 minutes ------------ Low 2 minutes to 4 minutes -------- Med. More than 4 minutes -----------High or Super high

The upper limit of the fan speed in MANUAL is the set speed. When the temperature of indoor coil thermistor has been 104 °F or more, or when the set speed has been changed, this control is released and the fan speed is the set speed.

3. Overload starting

When the room temperature thermistor reads 64 °F or more, the compressor runs with its maximum frequency regulated for 10 minutes after the start-up.

4. Defrosting

(1) Starting conditions of defrosting

When the following conditions a) ~ c) are satisfied, the defrosting starts. a) The defrost thermistor reads 27 °F or less. b) The cumulative operation time of the compressor has reached any of the set values

(40, 45, 55, 65, 75, 85, 95, 105,

115, 125, 150 minutes.

c) More than 5 minutes have passed since the start-up of the compressor.

Set value of compressor operation time (here in after referred to as defrost interval)

This is decided by the temperature of defrost thermistor, ambient temperature thermistor, and the previous defrosting

time. For example, the first defrost interval is 40 minutes long, and the second is 45 minutes long. The third and subsequent intervals are set to be longer, and less frequent, depending on defrosting time.

The third and subsequent defrost intervals follow any of the three patterns …5 or 10 to 20 minutes longer, the same,

or 5 or 10 to 20 minutes shorter compared with the previous defrost interval … with the longest 125 minutes and the shortest 40 minutes.

(2) Releasing conditions of defrosting

Defrosting is released when any of the following conditions is satisfied: a) The defrost thermistor continues to read 50 °F or more (MUZ-A09/12 MUZ-D) / 41 °F or more (MUZ-A15/17 MUZ-FD) /

59 °F or more (MUZ-A24) for 30 seconds. b) Defrosting time has exceeded 10 minutes. c) Any other mode than HEAT mode is set during defrosting.

Time chart of defrosting in HEAT mode (reverse type)

Horizontal vane

Indoor fan

Compressor normal

Outdoor fan

set position

set speed

seconds

ON ON

horizontal (temperature of indoor coil thermistor < 102 °F)

Very Low (temperature of indoor coil thermistor > 64 °F)

seconds

Maximum frequency

OFF

seconds

5 seconds 5 seconds

horizontal

OFF

seconds

OFF

seconds

set position

set speed

R.V. coil

(21S4)

ON (HEAT)

OFF (COOL)

ON (HEAT)

2-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ)

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.

If the room temperature thermistor reads more than set temperature, COOL mode is selected. If the room temperature thermistor reads set temperature or less, HEAT mode is selected.

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