SiUS30-1301
Stop
Function and Control
45
Heating or simultaneously cooling/heating operation
The system operates in mode A or mode B listed in the table below.
Note:
The changeover operation for mode A and B is performed for the reason that the required
refrigerant amount varies depending on the indoor unit operation capacity.
2.1.3 Abnormal Stop
In order to protect compressors, if any of the following items has an abnormal value, the system will
make "stop with thermostat OFF" and the error will be determined according to the number of retry
times.
Parts Name
Symbol
Electric
Symbol
Mode A Operation (
1)
Mode B Operation (
1)
Inverter compressor
—
M1C
OFF
OFF
Inverter cooling fan
—
M1F, M2F
OFF
OFF
Four-way valve (Main)
20S1
Y5S
Holding
Holding
Four-way valve (Sub)
20S2
Y7S
Holding
Holding
Electronic expansion valve (Main)
EV1
Y1E
0 pulse
0 pulse
Electronic expansion valve (Subcooling)
EV3
Y3E
0 pulse
0 pulse
Solenoid valve (Hot gas)
SVP
Y1S
OFF
OFF
Solenoid valve (Oil return of water heat
exchanger)
SVE
Y2S
OFF
OFF
Solenoid valve (Receiver gas charging)
SVL
Y3S
ON
OFF
Solenoid valve (Receiver gas
discharging)
SVG
Y4S
OFF
OFF
Solenoid valve (Non-operating unit liquid
pipe closing)
SVSL
Y6S
OFF
ON
Mode transition conditions
To Mode B when no
refrigerant shortage signal
is sent from indoor unit
To Mode A when
refrigerant shortage signal
is sent from indoor unit
Ending conditions
Slave units are required to operate.
⎧
⎨
⎩
∗
1 Mode A or B operation
Mode A: Master unit collects refrigerant.
Mode B: Slave unit storage refrigerant.
Master
unit
Slave
unit
Item
Judgement Value
Retry Number
Error Code
Low pressure abnormality
10.1 psi
3 times in 60 minutes
E4
High pressure abnormality
580 psi
2 times in 30 minutes
E3
Discharge pipe temperature
abnormality
275°F
2 times in 100 minutes
F3
Power supply abnormality
Reverse phase
No retry
U1
Inverter current abnormality
230V unit: 26.1A for 260 sec.
or 31.0A for 5 sec.
460V unit: 14.5A for 260 sec.
or 17.0A for 5 sec.
3 times in 60 minutes
L8
Radiation fin temperature
abnormality
192.2°F
3 times in 60 minutes
L4