Mitsubishi Electric PURY-P72 Service Handbook page 136

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Thermis- TH4
tor (Discharge)
TH3
(Pipe
temperature)
TH7
(Outdoor tem-
perature)
TH5
TH6
THHS
Inverter
heat sink tem-
perature
THBOX
Control box in-
ternal tempera-
ture detection
Solenoid SV1a
valve Discharge-suc-
tion
bypass
SV2
SV4a - SV4d
Heat
exchanger
capacity control
SV5b
Heat
exchanger
capacity control
SV5c
SV9
HWE09130
Notes Usage
1) Detects discharge air temper-
ature
2) Provides high-pressure pro-
tection
0°C[32°F] :698kohm
10°C[50°F] :413kohm
20°C[68°F] :250kohm
30°C[86°F] :160kohm
40°C[104°F] :104kohm
50°C[122°F] : 70kohm
60°C[140°F] : 48kohm
70°C[158°F] : 34kohm
80°C[176°F] : 24kohm
90°C[194°F] :17.5kohm
100°C[212°F] :13.0kohm
110°C[230°F] : 9.8kohm
Controls defrosting during heating
operation
1) Detects outdoor air tempera-
ture
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
1) High/low pressure bypass at
start-up and stopping, and
capacity control during low-
load operation
2) High-pressure-rise preven-
tion
Controls outdoor unit heat ex-
changer capacity
Prevents high-pressure-rise
Controls defrost cycle
Allows the refrigerant to pass
through the bypass pipe to pre-
vent an accumulation of liquid re-
frigerant
High-pressure-rise prevention
- 127 -
Specifications
Degrees Celsius
R = 7.465k
120
R = 4057
25/120
R =
t
1 1
7.465 exp
4057
393
Degrees Celsius
R = 15k
0
R = 3460
0/80
1 1
R = 15 exp
3460
t
273
0°C[32°F] :15kohm
10°C[50°F] :9.7kohm
20°C[68°F] :6.4kohm
25°C[77°F] :5.3kohm
30°C[86°F] :4.3kohm
40°C[104°F] :3.1kohm
Degrees Celsius
R = 17k
50
R = 4016
25/120
1 1
exp
R = 17
4016
t
323
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
AC208 - 230V
Open while being powered/
closed while not being pow-
ered
*The SV4c on the P120 and
P144 models closes when
energized and opens when
de-energized.
AC208 - 230V
Closed while being powered/
open while not being powered
AC208 - 230V
Open while being powered/
closed while not being pow-
ered
AC208 - 230V
Open while being powered/
closed while not being pow-
ered
Check method
Resistance
check
Resistance
check
Continuity
check with a
tester
GB