Mitsubishi P240 User Manual

[

VI Refrigerant Circuit ]

- 91 -

HWE09120

2. Indoor

Unit

Part

Name

Symbol

(functions)

Notes Usage

Specification Check

method

Linear
expan-
sion valve

LEV

1) Adjusts superheat at the

indoor heat exchanger
outlet during cooling

2) Adjusts subcool at the

heat exchanger outlet of
the indoor unit during
cooling

DC12V
Opening of stepping motor
driving valve 0-(1400) puls-
es

Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and or-
ange.
Continuity between
yellow, brown, and
blue.

Thermis-
tor

TH1
(Suction air
temperature)

Indoor unit control (Thermo)

     0°C [32°F]:15kohm
  10°C [50°F] :9.7kohm
  20°C [68°F]:6.4kohm
  25°C [77°F] :5.3kohm
  30°C [86°F] :4.3kohm
  40°C [104°F] :3.1kohm

Resistance check

TH2
(Pipe temper-
ature)

1) Indoor unit control (Frost

prevention, Hot adjust)

2) LEV control during heat-

ing operation (subcool
detection).

TH3
(Gas pipe
temperature)

LEV control during cooling op-
eration (superheat detection)

TH4
Outdoor air
temperature)

Indoor unit control (Thermo)

Temperature
sensor (In-
door air tem-
perature)

Indoor unit control (Thermo)

Yellow

White

Red

Orange

Brown Blue

273+t

=15k

0/80

=3460

Rt =
15exp{3460( - )}

273