3-2. EXPANSION VALVE CONTROL (LEV CONTROL)

Linear expansion valve (LEV) is controlled by “Thermostat ON” commands given from each unit.

Indoor unit status

LEV opening

Stop of all indoor unit

Opening before stop → 500 pulse in 15 minutes

When outdoor unit is operating,

COOL : 5 pulse (full closed)

some indoor units stop and some

HEAT :(MXZ-2A / 3A30NA) : 140 pulse (slightly opened)

operate.

:(MXZ-3A30NA-1 / 4A ) : 100 → 59 pulse

Thermostat OFF in COOL or DRY

When the outdoor unit operates (When the other indoor unit operates) : 5 pulse.

When outdoor unit stops. (When the other indoor unit stops or thermo off) :

mode

Maintain LEV opening before stop → 500 pulse in 15 minutes

 

 

 

 

• LEV opening for each indoor unit is determined by adding adjustment in accordance

 

with the number of operating unit and the capacity class to standard opening, based

 

on the operation frequency:

 

Ex.) Opening 130 pulse in standard opening 1 → Minimum 80 pulse, Maximum 205

 

pulse. (Capacity code 4 at 1 unit operation) (Capacity code 1 at 3 units operation)

Thermostat ON in COOL or DRY

• After starting operation, adjustment in accordance with intake super heat, discharge

mode

temperature is included in standard opening. 1

 

NOTE: LEV opening in each frequency at DRY operation and COOL operation is the

 

same. However, velocity and compressor operation frequency controls are differ-

 

ent. See 3-3. OPERATIONAL FREQUENCY RANGE

 

(As far as the indoor unit velocity control goes, refer to DRY operation in MICRO-

 

PROCESSOR CONTROL in indoor unit.)

 

 

 

• When the outdoor unit operates. (When the other indoor unit operates) : 140 pulse.

Thermostat OFF in HEAT mode

• When the outdoor unit stops. (When the other indoor unit stops or thermo off) : Main-

 

tain LEV opening before stop → 500 pulse in 15 minutes. “

 

• LEV opening for each indoor unit is determined by adding adjustment in accordance

 

with the number of operating unit and the capacity class to standard opening, based

 

on the operation frequency:

Thermostat ON in HEAT mode

Ex.) Opening 120 pulse in standard opening 1 → Minimum 70 pulse, Maximum 165

 

pulse. (Capacity code 4 at 1 unit operation) (Capacity code 1 at 3 units operation)

 

• After starting operation, opening becomes the one that adjustment in accordance with

 

discharge temperature was added to basic opening. 1 “

1 LEV opening when the outdoor unit is operating: Upper limit 500 pulse, Lower limit 53pulse (MXZ-2A / 3A30NA), 59 pulse (MXZ-3A30NA-1 / 4A).

23

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Mitsubishi Electronics MUY-ANA, MS-AWA, MUZ-ANA - U, MU-AWA, MSY-ANA, MSZ-ANA Opening before stop → 500 pulse in 15 minutes

MSZ-FDNA, MUZ-FDNA - U, MUZ-FDNA, MUZ-ANA - U, MUY-ANA specifications

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