List Of Major Component Functions - Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook

[5] List of Major Component Functions

Name Symbol (function)
Compressor MC
High pressure 63HS
sensor
Low pressure 63LS
sensor
Pressure 63H
switch
Thermistor TH1
(discharge)
TH2
(low pressure
saturation
temperature)
TH3 TH4 (liquid
level detection)
TH6 (Inlet water
air temperature)
TH9
THINV
Application
Adjust refrigerant circulation by control-
ling 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 circulation
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 tempera-
ture.
2) Calculates the refrigerant circulation
configuration.
3) Controls the compressor frequency.
4) Controls the valves for heat ex-
changer capacity control.
Detection of refrigerant liquid level inside
accumulator by temperature difference of
TH2, TH3 and TH4
1) Inlet water temperature detection
2) Liquid level heater, and opening
setting for oil return
1) Detects the CS circuit fluid tempera-
ture.
2) Calculates the refrigerant circulation
configuration.
1) Detects the temperature at the
inverter cooler's heat exchanger
outlet.
2) Controls the LEV2 opening angle.
–62–
Specification
Low pressure shell scroll type with
capacity control mechanism
Winding resistance:
Each phase 0.388Ω (20˚C)
Pressure
63HS
0~30 kg/cm 2 G
(0~2.94MPa)
Vout 0.5~3.5 V
Con-
Gnd (black)
nector
Vout (white)
Vc (DC5V) (red)
Pressure
63LS
0~10 kg/cm 2 G
(0~0.98MPa)
Vout 0.5~3.5 V
Con-
nector
Gnd (black)
Vout (white)
Vc (DC5V) (red)
Setting 30kg/cm 2 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 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
Check method
Continuity check
Resistance value
check
Resistance value
check