Mitsubishi Electric CITY MULTI CMB-P1010V-E, Руководство по обслуживанию, Страница: 66 / 154

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Name Symbol (function) Application Specification Check method
Heat source unit
Thermistor
Solenoid
valve
Linear
expansion
valve
Liquid level
detection
heater
Linear
expansion
valve
Thermistor
TH10
THHS
SV1
(discharge -
suction bypass)
SV2
(discharge -
suction bypass)
SV3 ~ 6
SV71~73
SLEV
LEV2
CH2, CH3
(accumulator
liquid level
detection)
LEV
TH21
(inlet air tempera-
ture)
TH22
(piping tempera-
ture)
TH23
(gas side piping
temperature)
1) Detects the compressor shell
temperature.
2) Provides compressor shell overheat-
ing protection.
1) Detects the inverter cooling fin
temperature.
2) Provides inverter overheating
protection.
3) Controls the control box cooling fan.
1) High/low press. bypass at starting/
stopping and capacity control at low
load
2) Discharge press. rise suppression
Capacity control and high press. rise
suppression (backup for frequency
control)
Control of heat exchanger capacity.
Adjustment of liquid refrigerant (oil)
return foam accumulator
Controls the volume of refrigerant flowing
to the inverter cooler’s heat exchanger.
Heating of refrigerant in accumulator
liquid level detection circuit
1) Adjust superheat of heat source unit
heat exchanger outlet at cooling.
2) Adjust subcool of indoor unit heat
exchanger at heating.
Indoor unit control (thermostat)
1) Indoor unit control (freeze prevention,
hot adjust, etc.)
2) LEV control in heating operation
(Subcool detection)
LEV control in cooling operation
(Superheat detector)
R
120
=7.465k
Ω
B
25/120
=4057
Rt =
7.465exp
{4057( - )}
20˚C : 250k
Ω
70˚C : 34k
Ω
30˚C : 160k
Ω
80˚C : 24k
Ω
40˚C : 104k
Ω
90˚C : 17.5k
Ω
50˚C : 70k
Ω
100˚C : 13.0k
Ω
60˚C : 48k
Ω
110˚C : 9.8k
Ω
R
50
=17k
Ω
B
25/50
=4170
Rt =
17exp{4170( - )}
-20˚C : 605.0k
Ω
50˚C : 17.0k
Ω
-10˚C : 323.3k
Ω
60˚C : 11.5k
Ω
0˚C : 180.9k
Ω
70˚C : 8.0k
Ω
10˚C : 105.4k
Ω
80˚C : 5.7k
Ω
20˚C : 63.8k
Ω
90˚C : 4.1k
Ω
30˚C : 39.9k
Ω
100˚C : 3.0k
Ω
40˚C : 25.7k
Ω
AC 220~240V
Open at energizing and
close at deenergizing
DC12V stepping motor drive
Valve opening 0~450 pulse
(SLEV), 0~150 pulse (LEV2)
Cord heater : 2k
Ω
(1k
Ω
+ 1k
Ω
)
AC220~240V
20W (10W + 10W)
DC12V
Opening of stepping motor
driving valve
60~2,000 pulses
R
0
= 15k
Ω
B
0/100
= 3460
Rt =
15exp {3460 ( - )}
0
°
C : 15k
Ω
10
°
C : 9.7k
Ω
20
°
C : 6.4k
Ω
25
°
C : 5.3k
Ω
30
°
C : 4.3k
Ω
40
°
C : 3.1k
Ω
• Continuity check by
tester
• Temperature of inlet
and outlet.
Resistance value
check
Continuity check with
tester for white-red-
orange
yellow-brown-blue
Resistance value
check
1
273+t
Indoor unit
1
273+50
1
273+t
1
273+t
1
273+0
1
273+120