MITSUBISHI ELECTRIC P500YMF-C User Manual
Page 59
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1
Detects the outdoor air temperature.
2
Performs fan control, liquid level
heater control, opening settings of
LEV for oil return and other functions.
Thermistor
R
0
= 15 k
Ω
B
1/80
= 3460
Rt =
15exp{3460( - )}
0
°
C: 15 k
Ω
10
°
C: 9.7 k
Ω
20
°
C: 6.4 k
Ω
25
°
C: 5.3 k
Ω
30
°
C: 4.3 k
Ω
40
°
C: 3.1 k
Ω
Resistance check
TH6
(Outdoor
temperature)
TH7
(Pipe inlet
heat ex-
changer
temperature)
Outdoor unit
Name
Code
(Function)
Inspection method
Application
Product code
Specification
1
273+t
1
273
1
273+t
1
273
1
273+t
1
273+120
1
273+t
1
323
Resistance check
TH3
TH4
(Liquid level
detection)
TH5
(Pipe
temperature)
Detects liquid level of refrigerant inside
accumulator using the differences
among TH2, TH3, TH4.
1
Frequency control.
2
Controls defrosting during heating.
Resistance check
Conductivity test
using tester
TH10
1) Detects the compressor shell
temperature.
2) Provides compressor shell over-
heating protection.
Inverter cooling fan control using THHS
temperature.
1
Capacity control of high/low
pressure bypass when starting and
stopping.
2
Discharge pressure rise suppression.
Switching of capacity control valve inside
No. 2 compressor (Switching between
full load operation and unload operation)
(only P500 YMF-C).
Capacity control and controlling the rise
of high-pressure (Back-up of frequency
control).
R
120
= 7.465 k
Ω
B
25/120
= 4057
Rt =
7.465exp
{4057( - )}
20
°
C: 250 k
Ω
70
°
C:
34 k
Ω
30
°
C: 160 k
Ω
80
°
C:
24 k
Ω
40
°
C: 104 k
Ω
90
°
C: 17.5 k
Ω
50
°
C: 70 k
Ω
100
°
C: 13.0 k
Ω
60
°
C: 48 k
Ω
110
°
C: 9.8 k
Ω
R
50
= 17 k
Ω
B
25/120
= 4170
Rt =
17exp {4170 ( - )}
0
°
C: 181 k
Ω
10
°
C: 105 k
Ω
20
°
C: 64 k
Ω
25
°
C: 50 k
Ω
30
°
C: 40 k
Ω
40
°
C: 26 k
Ω
AC 220 to 240 V
Open : conducting
Close: not conducting
AC 220 to 240 V
Close: conducting
Open : not conducting
AC 220 to 240 V
Open : conducting
Close: not conducting
THHS inverter
heat sink tem-
perature
SV1
discharge-
suction
bypass
SV22
capacity
control (full
load)
SV32
capacity
control
(unload)
SV4a
discharge-
suction
bypass
TH9
Controls defrosfing during heating
1) Detects the CS circuit fluid tempera-
ture.
2) Calculates the refrigerant circulation
configuration.
R
0
= 15 k
Ω
B
1/80
= 3460
Rt =
15exp{3460( - )}
0
°
C: 15 k
Ω
10
°
C: 9.7 k
Ω
20
°
C: 6.4 k
Ω
25
°
C: 5.3 k
Ω
30
°
C: 4.3 k
Ω
40
°
C: 3.1 k
Ω
Solenoid
valve