Mitsubishi Electric CITY MULTI P500YMF-C, Service Handbook

Page: 58 / 148

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1 Adjustment of super heat of heat
exchanger outlet port of indoor unit
during cooling.
2 Adjustment of sub-cool of heat ex-
changer outlet port of indoor unit
during heating.
Indoor unit control (Thermostat).
1
Indoor unit control (Freeze preven-
tion, hot adjust, etc.).
2 LEV control during heating (sub-cool
detection).
LEV control during cooling (super-heat
detection).
Uses the operating pressure to adjust
the operating frequency and adjust the
amount of circulating refrigerant.
When there is a load that cannot be
adjusted by MC1, this function ensures
the stable flow of refrigerant.
[4] List of Major Component Functions
Name
Code
(Function)
Electronic
expansion
valve
Thermistor
Compres-
sor
Outdoor unit
Inspection method
DC 12 V
Amount of opening of the
stepping motor drive valve
60 to 2000 pulse.
(Gear Type)
R
0
= 15 k
Ω
B
0/80
= 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
Low-pressure shell scroll
type. Winding resitance
0.481 (20
°
C).
Low-pressure shell scroll type.
Winding resistance: each phase.
1.996 (20
°
C): P400 YMF-C
1.197 (20
°
C): P500 YMF-C
1
273+t
1
273
1
273+t
1
393
Application Product code Specification
Indoor unit
LEV
TH21
(Inlet air
temperature)
TH22
(Piping
temperature)
TH23
(Gas piping
temperature)
MC1
MC2
White
Red
Yellow Brown Blue
Orange
M
Perform a continuity
check using a tester.
Conductivity among
white, red and orange.
Conductivity among yel-
low, brown and blue.
Resistance value
check
Con-
nector
Pressure
0 to 30 kg/cm
2 G
(0 to 2.94 MPa)
Vout 0.5 to 3.5 V
Connector
GND (Black)
Vout (White)
Vc (DC 5 V) (Red)
1
273+t
1
273
63HS
Pressure
0 to 10 kg/cm
2 G
(0 to 0.98 MPa)
Vout 0.5 to 3.5 V
(0.3 V/kg/cm
2
, V/MPa)
Gnd (black)
Vout (white)
Vc (DC 5 V) (Red)
Con-
nector
63LS
Set to 30 kg/cm
2
G
(2.94 MPa) OFF.
R
120
= 7.465 k
Ω
B
25/120
= 4057
Rt =
7.465exp{4057( - )}
R
0
= 33 k
Ω
B
0/100
= 3965
R
t
=
33exp{3965( - )}
– 20
°
C: 92 k
Ω
– 10
°
C: 55 k
Ω
0
°
C: 33 k
Ω
10
°
C: 55 k
Ω
20
°
C: 13 k
Ω
30
°
C: 8.2 k
Ω
1 Detects high-pressure pressure.
2 Performs frequency control and high-
pressure protection.
1) Detects low-pressure.
2) Calculates the refrigerant circula-
tion configuration.
3) Protects the low pressure
1 Detects high-pressure.
2 Performs high-pressure protection.
1 Detects high-pressure pressure.
2
Performs high-pressure protection.
0
°
C: 698 k
Ω
60
°
C: 48 k
Ω
10
°
C: 413 k
Ω
70
°
C: 34 k
Ω
20
°
C: 250 k
Ω
80
°
C: 24 k
Ω
30
°
C: 160 k
Ω
90
°
C: 17.5 k
Ω
40
°
C: 104 k
Ω
100
°
C: 13.0 k
Ω
50
°
C: 70 k
Ω
110
°
C: 9.8 k
Ω
1
Detects low pressure saturation tem-
perature.
2
Performs frequency control and liq-
uid level of accumulator.
High
pressure
sensor
Low
pressure
sensor
Pressure
switch
Thermistor
63HS
63LS
63H1
62H2
TH11,12
(Outlet)
TH2 (Low
pressure
saturation
temperature)
Conductivity check
Resistance check
Resistance check