Mitsubishi Electric PURY-HP144, Service Handbook

Page: 90 / 398

[3-7 Functions of the Major Components of BC Controller ]
HWE18220_GB
chapter 3 -
13
3 Major Components, Their Fu
nctions and Refrigerant Circuits
3-7 Functions of the Major Components of BC Controller
(1) J type
Part name
Symbols
(functions)
Part
code
Usage Specifications Check method
Pressure
sensor PS1
(High pres-
sure side) 1) Detects high pressure
2) LEV control
PS3
(Intermedi-
ate pres-
sure) 1) Detects intermediate
pressure
2) LEV control
Thermistor TH11
(Liquid inlet
tempera-
ture) LEV control
(Liquid level control)
0°C[32°F] : 15 k
ȍ
10°C[50°F] :9.7 k
ȍ
20°C[68°F] :6.4 k
ȍ
25°C[77°F] :5.3 k
ȍ
30°C[86°F] :4.3 k
ȍ
40°C[104°F] :3.1 k
ȍ
TH12
(Bypass
outlet tem-
perature) LEV control (Superheat)
TH15
(Bypass in-
let tempera-
ture) LEV control (Superheat)
TH16
(Liquid re-
frigerant
tempera-
ture) LEV control (Subcool)
Solenoid
valve SVA Provides refrigerant to indoor
unit in cooling operation AC208-230V
Open while being powered/
closed while not being pow-
ered Continuity
check with a
tester
SVB Provides refrigerant to indoor
unit in heating operation
SVC Provides refrigerant to indoor
unit in cooling operation
LEV LEV1 1) Liquid level control
2) Pressure differential con-
trol
DC12V
Opening of a valve driven by a
stepping motor
41-3000 pulses Same as
indoor LEV
LEV3
Pressure
0~4.15 MPa [601psi]
Vout 0.5~3.5V
0.071V/0.098 MPa [14psi]
Pressure [MPa]
=1.38 x Vout [V]-0.69
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145
GND (Black)
Vout (White)
Vcc (DC5V) (Red)
Con-
nector
PS1
1
1 2 3
2
3
R = 15k
0
R = 3460
R = 15
0/80
t
3460
273 t
1
273
1
exp