Specifications

ManualsBrandsMitsubishi ManualsAir ConditionerP500YMF-C

-82-

(11) Liquid Refrigerant Correction Control

The liquid refrigerant correction control adjusts the liquid refrigerant amounts between both accumulators in the

unlikely event that the liquid refrigerant amount in both the constant and variable capacity unit accumulators should

be insufficient, or if excessive amount of liquid refrigerant is returned to either accumulator.

During this operation, Service LED No. 4 on the variable capacity unit will light up.

Direction of Accumula-

tor Liquid Transfer

Variable Capacity Unit

Constant Capacity Unit

Indoor Unit

Variable Capacity Unit

Constant Capacity Unit

Variable Capacity Unit

Constant Capacity Unit

Variable Capacity Unit

Constant Capacity Unit

Variable Capacity Unit

Constant Capacity Unit

Variable Capacity Unit

Constant Capacity Unit

Variable Capacity Unit

Start Conditions

• In heating mode

• Run and stop indoor units

are mixed.

• Pd 13k (1.27 MPa), or

during an accumulator

overflow preliminary error.

• Td < 110˚C

• In heating mode

• While the constant capacity

unit is stopped.

• During an accumulator

overflow preliminary error

in the variable capacity unit

(AL1 = 2)

• TdSH < 40 deg *1

• In heating mode

• During constant capacity

unit operation

• When AL1 = 2 is detected in

the variable capacity unit.

• TdSH < 40 deg *1

• In cooling mode

• While the constant capacity

unit is stopped.

• During an accumulator

overflow preliminary error

in the variable capacity unit

(AL1 = 2)

• Constant capacity unit

AL2 = 0 or 1

• Variable capacity unit

TH6 < 25˚C

• In heating mode

• Constant capacity unit

switches from operation to

stopping.

•

Constant capacity unit AL2 = 0

• In heating mode

• During an accumulator

overflow error delay in the

constant capacity unit

(AL2 = 2)

• Variable capacity unit

AL1 = 0 or 1

• During cooling or heating

• During an accumulator

overflow preliminary error

in the constant capacity

unit (AL2 = 2)

• Variable capacity unit

AL1 = 0 or 1

Actuator Action

Com-

pressor

–

OFF

–

OFF

Constant Capacity Unit

Variable

capacity

unit

–

Opera-

tion

fre-

quency

level

–

Opera-

tion

fre-

quency

level

down

21S4a,

Indoor

Unit

Opera-

tion:

nor-

mal

control

Stop:

LEV = 60

–

All

indoor

unit

LEV = 60

–

All

indoor

unit

LEV = 60

Stopping

Conditions

While all

indoor units

are operat-

ing

Td 115˚C

• AL1 = 0 or 1

• Continuing

for 20

minutes

• AL1 = 0 or 1

• AL2 = 2

• Continuing

for 10

minutes

• AL1 = 0 or 1

• Continuing

for 15

minutes

• AL1 = 0 or 1

• Continuing

for 3 ~ 6

minutes

• AL2 = 0 or 1

• AL1 = 2

• Continuing

for 10

minutes

• AL1 = 2

• Continuing

for 4

minutes

LED Monitor

No.4

• Verify

surplus

refrigerant

• LD1 lights

Liquid

refrigerant

control

LD3 lights

Liquid

refrigerant

control

LD5 lights

Liquid

refrigerant

control

LD7 lights

Liquid

refrigerant

control

LD8 lights

Liquid

refrigerant

control

LD4 lights

Liquid

refrigerant

control

LD6 lights

LEV2

–

2000

–

2000

SV5b

–

(open)

–

(open)

Other

–

Fa n

–

LEV1 =

480

SV4 ON

21S4

OFF

* 1 TdSH (Discharge temperature superheating) = Discharge temperature (TH11 or TH12) - Tc (High pressure satur

ation

temperature)