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3. Bypass control
Bypass solenoid valves (P200-P400: SV1, SV2, P450-P650: SV1, SV2, SV3), which bypass the high- and low-
pressure sides, operate in the following manner.
(1) Bypass solenoid valve (SV1) (ON = Open)
Operation Timing
At No. 1 compressor start up
or at No. 2 compressor start up
(P450-P650 types only)
After the restoration of thermo
or 3 minutes after restart
During cooling or heating operation
with the compressor stopped
After the operation has stopped
During defrost operation
(See figure ✻1 below)
During oil-recovery operation
During an operation with the
compressor running at 30Hz
When low pressure (LPS) drops
(After 3 minutes have past since
start up)
When high pressure (Pd) rises
[ Example of an SV1 operation ]
Compressor
Bypass solenoid
Start
valve (SV1)
up
(4-minute)
(2) Bypass solenoid valve (SV2) (Open when ON)
Item
When low pressure (LPS) drops in
heating-only or heating-main operation
(5 or more minutes after compressor startup)
(3) Bypass Valve (SV3, P450-P650 types only) (ON = Open)
• The opening SV3 is controlled by the configuration of No.1 and No.2 compressor operations.
No.1 Compressor
No.2 Compressor
Stopped
In operation
In operation
ON (Open)
Always ON. (Exception : OFF when HPS-LPS
ON for 3 minutes. (Exception : OFF when HPS
Always OFF during cooling operation and always ON
during heating operation when running an oil-recovery operation after running a
When low pressure (LPS) drops
below 0.23 MPa.
When Pd exceeds 3.77 MPa
Thermo.
Thermo.
OFF
ON
(2-minute)
When low pressure (LPS)
drops below 0.25 MPa.
SV3
Stopped
OFF
Stopped
ON
In operation
OFF
- 92 -
SV1
ON for 4 minutes
ON for 2 minutes
Always ON
continuous operation at low frequency.
When low pressure (LPS) exceeds
0.38 MPa.
When Pd is or below 3.43MPa and
30 seconds has passed
Defros-
ting
Time
(8-minute)
SV2
ON
When low pressure (LPS)
rises above 0.39 MPa.
OFF (Close)
0.2MPa)
0.2MPa)
Stop
)
(3-minute
OFF
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Troubleshooting
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