Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

Page: 85 / 503

[3-4 Functions of the Major Components of Indoor Unit ]
16
- chapter 3 BS_03_L
3 Major Compon
ent
s
, Their Fun
ct
io
ns
a
n
d
Re
frig
e
ra
n
t
Circ
ui
ts
3-4 Functions of the Major Components of Indoor Unit
Some parts are not built in, depending on the connected indoor units.
Part
Name
Symbol
(functions)
Notes Usage Specification Check method
Flow con-
trol valve
FCV Controls the rate of water flow
to the indoor unit.
DC12V
Opening of stepping motor
driving valve 85-(770) pulses
Refer to the section [8-
8-4 General Overview
on FCV Operation (In-
door unit)].
Thermis-
tor
TH1
(Suction air tem-
perature)
Indoor unit control (Thermo)
0°C [32°F]:15 k Ω
10°C [50°F]: 9.7 k Ω
20°C [68°F]: 6.4 k Ω
25°C [77°F]: 5.3 k Ω
30°C [86°F]: 4.3 k Ω
40°C [104°F]: 3.1 k Ω
Resistance check
TH2
(Inlet pipe tem-
perature)
Indoor unit control (Hot adjust)
TH3
(Outlet pipe tem-
perature)
Indoor unit control (Error de-
tection)
TH4
Outdoor air tem-
perature)
Indoor unit control (Thermo)
Temperature
sensor (Indoor
air temperature)
Indoor unit control (Thermo)
Pressure
sensor
(inner wa-
ter)
PS1 1) Detects inner water pres-
sure
2) Check flow rate
Pressure
sensor
(outlet
water)
PS2 1) Detects outlet water pres-
sure
2) Check flow rate
1
273+t
R
0
=15k
R
0/80
=3460
Rt =
15exp{3460( - )}
1
273
Pressure
0~1.0 MPa [145psi]
Vout 0.5~4.5V
0.392V/0.098 MPa [14psi]
Pressure [MPa]
=0.25 x Vout [V] - 0.125
Pressure [psi]
=(0.25 x Vout [V] - 0.125) x 145
GND (Black)
Vout (White)
Vcc (DC5V) (Red)
Con-
nector
PS1
1
1 2 3
2
3
Pressure
0~1.0 MPa [145psi]
Vout 0.5~4.5V
0.392V/0.098 MPa [14psi]
Pressure [MPa]
=0.25 x Vout [V] - 0.125
Pressure [psi]
=(0.25 x Vout [V] - 0.125) x 145
GND (Black)
Vout (White)
Vcc (DC5V) (Red)
Con-
nector
PS1
1
1 2 3
2
3
Component Sym-
bol
Room temperature
thermistor
TH21
Resistance 0°C/15k Ω , 10°C/9.6k Ω , 20°C/6.3k Ω , 25°C/5.4k Ω , 30°C/4.3k Ω , 40°C/3.0k Ω
Water inlet pipe
thermistor
TH22
Resistance 0°C/15k Ω , 10°C/9.6k Ω , 20°C/6.3k Ω , 25°C/5.4k Ω , 30°C/4.3k Ω , 40°C/3.0k Ω
Water outlet pipe
thermistor
TH23
Resistance 0°C/15k Ω , 10°C/9.6k Ω , 20°C/6.3k Ω , 25°C/5.4k Ω , 30°C/4.3k Ω , 40°C/3.0k Ω
0000006412.BOOK 16 ページ ２０２１年１０月１２日 火曜日 午後４時３３分