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