Mitsubishi Electric PUHY-200YMF-B Service Handbook page 77

[4] List of Major Component Functions
Symbol
Name
(function)
Compres- MC
sor
High 63HS
pressure
sensor
Low 63LS
pressure
sensor
Pressure 63H
switch
Thermistor TH1
(discharge)
TH2
(low pressure
saturation
temperature)
TH3 TH4
(liquid level
detection)
TH5
(piping
temperature)
TH6 (outdoor
air tempera-
ture)
TH7
(subcool coil
outlet
temperature)
TH8
(subcool coil
bypass outlet
temperature)
TH9
Application
Adjust refrigerant circulation by
controlling operating frequency and
capacity control valve with operating
pressure.
1) High press. detection.
2) Frequency control and high
pressure protection
1) Detects low pressure
2) Calculates the refrigerant circula-
tion configuration.
3) Protects the low pressure
1) High pressure detection
2) High pressure protection
1) Discharge temperature detection
2) High pressure protection
20˚C : 250kΩ 70˚C : 34kΩ
30˚C : 160kΩ 80˚C : 24kΩ
40˚C : 104kΩ 90˚C : 17.5kΩ
50˚C : 70kΩ 100˚C : 13.0kΩ
60˚C : 48kΩ 110˚C : 9.8kΩ
1) Detects the saturated vapor
temperature.
2) Calculates the refrigerant circula-
tion configuration.
3) Controls the compressor fre-
quency.
4) Controls the outdoor unit's fan air
volume.
Detection of refrigerant liquid level
inside accumulator by temperature
difference of TH2, TH3 and TH4
1) Frequency control
2) Defrost control and liquid level
detection at heating
1) Outdoor air temperature detection
2) Fan control, liquid level heater, and
opening setting for oil return
Subcool coil bypass LEV (LEV1)
control
Subcool coil bypass LEV (LEV1)
control
1) Detects the CS circuit fluid
temperature.
2) Calculates the refrigerant
circulation configuration.
Specification
Low pressure shell scroll type
with capacity control mechanism
Winding resistance:
Each phase 0.388Ω (20˚C)
Pressure
63HS
0~30 kg/cm
(0~2.94MPa)
Vout 0.5~3.5 V
Con-
Gnd (black)
nector
Vout (white)
Vc (DC5V) (red)
Pressure
63LS
0~10 kg/cm
(0~0.98MPa)
Vout 0.5~3.5 V
Con-
nector
Gnd (black)
Vout (white)
Vc (DC5V) (red)
2
Setting 30kg/cm G
(2.94MPa) OFF
R =7.465kΩ
120
B =4057
25/120
Rt = 7.465exp
1 1
{4057( - )}
273+t 273+120
R =33kΩ
0
B =3965
0/100
Rt =
1 1
33exp{3965( -
273+t 273+0
-20˚C : 92kΩ
-10˚C : 55kΩ
0˚C : 33kΩ
10˚C : 20kΩ
20˚C : 13kΩ
30˚C : 8.2kΩ
R =15kΩ
0
B =3460
0/100
Rt =
1
15exp{3460( -
273+t
273+0
0˚C : 15kΩ
10˚C : 9.7kΩ
20˚C : 6.4kΩ
25˚C : 5.3kΩ
30˚C : 4.3kΩ
40˚C : 3.1kΩ
–75–
Check method
• PU(H)Y-
• PURY-
2
G
• PUHY-
2
G
• PURY-
Continuity check • PU(H)Y-
• PURY-
Resistance value
check
Resistance value • PU(H)Y-
check
• PURY-
)}
• PU(H)Y-
• PURY-
1
)}
• PU(H)Y-
• PUHY-
• PURY-
Object
(P)200·250YMF-B
(P)200·250YMF-B
P200·250YMF-B
(P)200·250YMF-B
(P)200·250YMF-B
(P)200·250YMF-B
(P)200·250YMF-B
P200·250YMF-B
(P)200·250YMF-B
(P)200·250YMF-B
(P)200·250YMF-B
P200·250YMF-B
P200·250YMF-B