Mitsubishi Electric CAHV-P500YA-HPB Service Handbook page 66

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Thermi TH3
stor (Pipe
temperature)
TH7
(Outdoor tem-
perature)
TH5
TH6
THHS
Inverter
heat sink tem-
perature
Sole- SV1
noid INJ control
valve
SV2
Heat
exchanger
capacity control
Heater CH
4-way 21S4
valve
Fan FAN motor
motor
Linear LEV2
expan- (INJ control)
sion
valve
LEV1a
LEV1b
(Refrigerant
flow adjust-
ment)
HWE10060
Notes Usage
Controls defrosting during
heating operation
1) Detects outdoor air tem-
perature
2) Controls fan operation
Fan operated on the 63LS and
TH5 values.
Controls defrosting during
heating operation
Controls inverter cooling fan
based on THHS temperature
Turns on/off the injection
Controls defrost cycle
Heats the refrigerant in the
compressor
Changeover between heating
and defrost
Regulates the heat exchanger
capacity by adjusting the oper-
ating frequency and operating
the propeller fan based on the
operating pressure.
Adjusts the amount of bypass
flow from the liquid pipe on the
outdoor unit during heating
Adjusts refrigerant flow during
heating
Specifications
Degrees Celsius
R = 15k
0
R = 3385
0/80
exp
R = 15
3385
t
0°C[32°F] :15kohm
10°C[50°F] :9.7kohm
20°C[68°F] :6.5kohm
25°C[77°F] :5.3kohm
30°C[86°F] :4.4kohm
40°C[104°F] :3.0kohm
Degrees Celsius
R = 17k
50
R = 4016
25/120
R = 17 exp
4016
t
0°C[32°F] :161kohm
10°C[50°F] :97kohm
20°C[68°F] :60kohm
25°C[77°F] :48kohm
30°C[86°F] :39kohm
40°C[104°F] :25kohm
AC220 - 240V
Open while being powered/
closed while not being pow-
ered
AC220 - 240V
Open while being powered/
closed while not being pow-
ered
Cord heater
ohm 45W
AC220-240V
Dead: defrost cycle
Live: heating cycle
AC342V, 50.5Hz, 920W
DC12V
Opening of a valve driven
by a stepping motor 0-480
pulses (direct driven type)
DC12V
Opening of a valve driven
by a stepping motor 2000
pulses
- 59 -
Check method
Resistance check
1 1
273
1 1
323
Continuity check with a
tester
Resistance check
Continuity check with a
tester
Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, brown, and or-
ange.
Continuity between yel-
low, red, and blue.
Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and orange.
Continuity between yel-
low, brown, and blue.
White
Red
Orange
Yellow Brown Blue
M
GB