Functions Of The Major Components Of Indoor Unit - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[3-5 Functions of the Major Components of Indoor Unit ]

3-5

Functions of the Major Components of Indoor Unit

Part Symbols
name (functions)
Linear ex- LEV
pansion
valve
(LEV)
Thermis- TH21
tor (Suction air tem-
perature)
TH22
(Pipe tempera-
ture)
TH23
(Gas pipe tem-
perature)
TH24
(Discharge air
temperature)
Float 33P1
Switch
33P2
Motor MF
BS_03_C
Notes Usage
Adjusts superheat at the heat ex-
changer outlet of the indoor unit
during cooling
Indoor unit control (Thermo)
Indoor unit control (Freeze pre-
vention)
LEV control during cooling oper-
ation (Superheat detection)
Controls indoor unit discharge
(thermostat)
Detects drain pan water level
P500
mod-
el only
Sends air
Specifications
DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses
R = 15k
0
R = 3460
0/80
1 1
exp
R = 15
3460
t
273
0°C[32°F] : 15kΩ
10°C[50°F] :9.7kΩ
20°C[68°F] :6.4kΩ
25°C[77°F] :5.3kΩ
30°C[86°F]:4.3kΩ
40°C[104°F] :3.1kΩ
Contact Resistance:
Under 250 mΩ
B contact type
PFD-P250VM-E
AC380~415V Type E 4P
Output 3.7kW
PFD-P500VM-E
AC380~415V Type B 4P
Output 5.5kW
Check method
Continuity check with
a tester
Continuity between
white, red, and or-
ange.
Continuity between
yellow, brown, and
blue.
White
M
Red
Orange Yellow Brown Blue
Resistance check
Continuity check with
a tester
Rotation number
check
Standard 930rpm
Rotation number
check
Standard 978rpm
15
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