Outdoor Unit Refrigerant System Diagram - Panasonic Urban Multi MX1R Series Service Manual

Outdoor Unit Refrigerant System Diagram

1. Outdoor Unit Refrigerant System Diagram

1.1

Outdoor Unit Refrigerant System Diagram

PA-16~30MA1XPK
No. Name
A Inverter compressor
B Constant-speed compressor 1
C Constant-speed compressor 2
J Electronic expansion valve
K Electronic expansion valve
L Electronic expansion valve
M Solenoid valve
N Solenoid valve
O Solenoid valve
P Solenoid valve
Q Solenoid valve
R Solenoid valve
S High pressure sensor
T Low pressure sensor
U High pressure switch
V High pressure switch
W High pressure switch
X Pressure regulating valve
Y Fusible plug
1 Outside air thermistor
2 Heat exchanger thermistor 1
3 Heat exchanger thermistor 2
4 Heat exchanger thermistor 3
5 Discharge pipe thermistor 1
6 Discharge pipe thermistor 2
7 Discharge pipe thermistor 3
8 Header thermistor 1
9 Header thermistor 2
10 Header thermistor 3
11 Suction pipe thermistor
414
Code
M1C Combination of a compressor (inverter compressor)
capable of operating at 29-79 Hz with inverter drive and
M2C
compressors (constant-speed compressors) operable
only on commercial power supply achieves 45-step control
M3C
(38 steps in PA-16·18·20MA).
Y1E (For master unit heat exchangers)
Provides PI control during heating operation to maintain
constant superheated degree (SH).
Y2E (For sub unit heat exchangers)
Provides PI control during heating operation to maintain
constant superheated degree (SH).
Y3E (For sub unit's heat exchanger)
Provides PI control during heating operation to maintain
constant superheated degree (SH).
Y1S (For auxiliary condensers)
Y2S (For hot gas bypass and pressure equalization)
Bypasses hot gas during transitional operation such as
defrosting operation to prevent sudden decrease of low
pressure. Also equalizes pressure to reduce startup load.
Y3S (For inverter unit liquid injection)
Provides liquid injection to prevent overheating operation.
Y4S (For constant-speed unit liquid injection)
Provides liquid injection to prevent overheating operation.
Y5S (For receivers)
Y6S (For constant-speed unit liquid injection)
Provides liquid injection to prevent overheating operation.
SENPH Heating operation: Provides PI control for compressors by
detecting high pressure.
Cooling operation: Controls compressors to ensure
sufficient high pressure when outside temperature is low.
SENPL Cooling operation: Provides PI control for compressors by
detecting low pressure.
Heating operation: Controls motorized valves to maintain
constant evaporator superheated degree.
S1PH Opens at set pressure of 3.09 MPa to stop operation.
S2PH
S3PH
Pressure relief valve to protect liquid sealing in receiver
piping during transportation or storing.
It opens at 2.65 MPa.
Plug head melt at 70~75°C around receiver and high
pressure and high temperature refrigerant is relived.
R1T Detects outside temperature and uses it as a function in
determining defrost IN conditions during heating
operation.
R2-1(11)T Uses inlet temperature of each heat exchanger as a
function (together with outside temperature data) in
R2-12T
determining defrost IN conditions during heating
operation.
R2-2T
R3-1(11)T Detects discharge pipe temperature of inverter
compressor and use it for compressor discharge pipe
temperature protection.
R3-2(12)T Detects discharge pipe temperature of constant-speed
compressor 1 and use it for compressor discharge pipe
temperature protection.
R3-13T Detects discharge pipe temperature of constant-speed
compressor 2 and use it for compressor discharge pipe
temperature protection.
R4-1(11)T Detects outlet temperatures of heat exchangers and uses
it in constant superheated degree (SH) control (electronic
R4-2(12)T
expansion valve contro
R4-13T
R6-1T Detect accumulator outlet temperature and protect
compressor.
Function
l)
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
Remarks
(PA-24~30MA only)
(Master unit's left side
exchanger in case of
PA-24~30MA1XPK)
(Master unit's right side heat
exchanger in case of
PA-24~30MA1XPK)
(PA-24~30MA only)
(PA-24~30MA only)
(PA-24~30MA only)
(PA-24~30MA only)
(PA-24~30MA only)
(PA-24~30MA only)