List Of Major Component Functions - Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook

[3] List of Major Component Functions

Code
Name
(Function)
LEV
Electronic
expansion
valve
TH21
Thermistor
(Inlet air
temperature)
TH22
(Piping
temperature)
TH23
(Gas piping
temperature)
MC1
Compres-
sor
MC2
63HS
High
pressure
sensor
63LS
Low
pressure
sensor
Pressure 63H1
62H2
switch
Thermistor
TH11,12
(Outlet)
TH2 (Low
pressure
saturation
temperature)
Product code Application
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.
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 kΩ
10°C: 413 kΩ
20°C: 250 kΩ
30°C: 160 kΩ
40°C: 104 kΩ
50°C: 70 kΩ
1
Detects low pressure saturation tem-
perature.
2
Performs frequency control and liq-
uid level of accumulator.
Specification
DC 12 V
Amount of opening of the
stepping motor drive valve
60 to 2000 pulse.
(Gear Type)
R = 15 kΩ
0
B = 3460
0/80
Rt =
15exp{3460(
0°C: 15 kΩ
10°C: 9.7 kΩ
20°C: 6.4 kΩ
25°C: 5.3 kΩ
30°C: 4.3 kΩ
40°C: 3.1 kΩ
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
63HS
Con-
nector
63LS
Con-
nector
Set to 2.94 MPa OFF.
60°C: 48 kΩ
70°C: 34 kΩ
R = 7.465 kΩ
120
80°C: 24 kΩ
B = 4057
25/120
90°C: 17.5 kΩ
Rt =
100°C: 13.0 kΩ
7.465exp{4057(
110°C: 9.8 kΩ
R = 33 kΩ
0
B = 3965
0/100
R =
t
33exp{3965(
– 20°C: 92 kΩ
– 10°C: 55 kΩ
0°C: 33 kΩ
10°C: 55 kΩ
20°C: 13 kΩ
30°C: 8.2 kΩ
-111-
Inspection method
Perform a continuity
check using a tester.
Conductivity among
white, red and orange.
Conductivity among yel-
low, brown and blue.
White
Red
Orange
Yellow Brown Blue
Resistance value
check
1 1
- )}
273+t 273
Pressure
0 to 2.94 MPa
Vout 0.5 to 3.5 V
Connector
GND (Black)
Vout (White)
Vc (DC 5 V) (Red)
Pressure
0 to 0.98 MPa
Vout 0.5 to 3.5 V
0.3 V/MPa
Gnd (black)
Vout (white)
Vc (DC 5 V) (Red)
Conductivity check
Resistance check
1 1
- )}
273+t 393
Resistance check
1 1
- )}
273+t 273
M