SiENBE28-901
Standard Specification
Air Cooled Refrigeration Condensing Unit
27
LRMEQ15, 20AY1
LRLEQ15, 20AY1
No.
Name
Symbol
Function
1
Inverter compressor (INV)
M1C
An inverter-driven compressor, which runs at operating frequencies in the
range of 52Hz to 232Hz.
2
Standard compressor (STD 1)
M2C
A compressor, which runs with commercial power supply.
3
Standard compressor (STD 2)
M3C
4
Fan motor
M1F
Used to operate a fan on the right for heat exchange through an air heat exchanger.
5
Fan motor
M2F
Used to operate a fan on the left for heat exchange through an air heat exchanger.
6
Electronic expansion valve
(Main: EV1)
Y1E
Not used.
7
Electronic expansion valve
(Injection: EV2)
Y2E
Used to control the injection flow rate and the compressor overheat
protection.
8
Electronic expansion valve
(M1C: EV3)
Y3E
Returns the oil to the inverter compressor and creates a gas-injection
economizer circuit.
In addition, this controls the difference in discharge pipe temperatures
between INV compressor and STD compressor.
9
Solenoid valve
Y2S
Returns the oil to the M2C and creates a gas-injection economizer circuit.
10
Four way valve
Y3S
Not used.
11
Solenoid valve
Y5S
Returns the oil to the M3C and creates a gas-injection economizer circuit.
12
High pressure sensor
S1NPH
Used to detect high pressure.
13
Low pressure sensor
S1NPL
Used to detect low pressure.
14
High pressure switch (for INV)
S1PH
In order to prevent the increase of high pressure when a malfunction
occurs, this switch activated at high pressure of 3.8MPa or more to stop the
compressor operation.
15
High pressure switch (for STD 1)
S2PH
16
High pressure switch (for STD 2)
S3PH
17
High pressure switch
S4PH
Not used.
18
Fusible plug
—
When the refrigerant of the receiver unit reaches a temperature of 70°C to
75°C, the fusible head of plug will melt, thus discharging the refrigerant of
high temperature and high pressure.
19
Pressure regulating valve
—
Opens when the pressure reaches 4.0 MPa. This prevents an excessive
pressure rise caused by the pipes being completely filled with liquid when
not in operation.
20
Plate type heat exchanger
—
Used to cool the liquid refrigerant from the liquid receiver.
21
Stop valve (Heat
exchanger on primary side)
—
Used to service.
22
Stop valve (Double pipe heat
exchanger on secondary side)
—
Used to service.
23
Service port
—
For gas (high pressure).
24
Service port
—
For liquid (high pressure).
25
Service port
—
For gas (low pressure).
26
Oil separator
—
Refrigerant gas discharged from the compressor contains lubricating oil in the
compressor. If the amount of this lubricating oil is large, the oil quantity in the
compressor will become short, which may result in defective lubrication.
Furthermore, this oil stains the heat transfer surface of condenser or evaporator
and reduces the effectiveness of the heat exchanger. To avoid that, an oil
separator is installed in close proximity to the discharge pipe of the compressor,
where oil is separated and collected to return to the compressor.
27
Liquid receiver
—
Used to compensate the variations in handling of refrigerant, thus providing stable
operating conditions at all times. In order to repair in the refrigerant circuit, this
receiver collects the refrigerant and facilitates the repairing of the parts.
28
Sight glass
—
Used to test run and service.
A
Thermistor (Outdoor air: Ta)
R1T
Used to detect the outdoor temperature and control the fan operation.
B
Thermistor (Suction pipe: Ti)
R2T
Used to detect the suction pipe temperature of M1C~M3C compressor and
protect this compressor.
C
Thermistor (INV discharge
pipe: Td1)
R31T
Used to detect the discharge pipe temperature of M1C compressor and
control over discharge pipe temperature of this compressor for protection.
D
Thermistor (STD 1
discharge pipe: Td2)
R32T
Used to detect the discharge pipe temperature of M2C compressor and
control over discharge pipe temperature of this compressor for protection.
E
Thermistor (STD 2
discharge pipe: Td3)
R33T
Used to detect the discharge pipe temperature of M3C compressor and
control over discharge pipe temperature of this compressor for protection.
F
Thermistor (Heat
exchanger deicer: Tce)
R3T
Not used.
G
Thermistor (Plate type heat
exchanger outlet: Tg)
R5T
Used to detect the gas temperature at evaporator side of double pipe heat exchanger,
and keep the constant overheated degree of double pipe heat exchanger.
H
Thermistor (Plate type heat
exchanger inlet: TL)
R6T
Used to detect the gas saturation temperature at evaporator side of double
pipe heat exchanger.
