Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

Page: 78 / 215

- 69 -
[
VI
Refrigerant Circuit ]
Ther-
mistor TH11
TH12
(Discharge) TH12 is
available
only on
P500
model 1.Detects discharge air temper-
ature
2.Provides high-pressure pro-
tection
Resis-
tance
check
0°C :698kohm
10°C :413kohm
20°C :250kohm
30°C :160kohm
40°C :104kohm
50°C : 70kohm
60°C : 48kohm
70°C : 34kohm
80°C : 24kohm
90°C :17.5kohm
100°C :13.0kohm
110°C : 9.8kohm
TH5
(Pipe
temperature) 1.Controls frequency
2.Controls defrosting during
heating operation
3.Detects subcool at the heat
exchanger outlet and controls
LEV1 based on HPS data and
TH5 data
0°C :15kohm
10°C :9.7kohm
20°C :6.4kohm
25°C :5.3kohm
30°C :4.3kohm
40°C :3.1kohm
Resis-
tance
check
TH6
(Outdoor
temperature) 1.Detects outdoor air tempera-
ture
2.Controls fan operation
TH7
TH8 Controls LEV1 based on TH5,
TH7, and TH8 data.
THHS
Inverter
heat sink
temperature Heat sink Controls inverter cooling fan
based on THHS temperature
0°C :181kohm
10°C :105kohm
20°C :64kohm
25°C :50kohm
30°C :40kohm
40°C :26kohm
Solenoid
valve SV1
Discharge-
suction
bypass 1.High/low pressure bypass at
start-up and stopping, and ca-
pacity control during low-load
operation
2.High-pressure-rise prevention
AC220~240V
Open while being powered/
closed while not being pow-
ered Continuity
check with
a tester
SV3
Discharge-
suction
bypass P500
model
only Provides compressor protection
while compressor No. 2 is
stopped
SV5b
Heat
exchanger
capacity
control Controls outdoor unit heat ex-
changer capacity AC220~240V
Closed while being powered/
open while not being powered
SV5c
Heat
exchanger
capacity
control P500
model
only
Part
name
Symbols
(functions)
Notes Usage Specifications
Check
method
R = 7.465k
120
R = 4057
R =
7.465
25/120
t
4057 273 t
1
393
1
exp
R = 15k
0
R = 3460
R = 15
0/80
t
3460 273 t
1
273
1
exp
R = 17k
50
R = 4170
R = 17
25/120
t
4170
273 t
1
323
1
exp