Mitsubishi Electric 500YEMK-A, Руководство по обслуживанию

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-77-
130˚C
(No. 1 compressor)
115˚C
(No. 2 compressor)
• Td
SV1
ON OFF
ON for 4 minutes
ON
ON for 3 minutes
ON
ON during oil recovery operation after
continuous low-frequency compressor
operation.
—
—
—
Item
At compressor is started
Compressor stopped during cool-
ing or heating mode
After operation has been stopped
During defrosting (( ❇ 1) in Fig below)
During oil recovery operation
When low pressure (Ps) has
dropped during lower limit fre-
quency operation(15 minutes af-
ter start)
When the high pressure (Pd) is
risen up during lower limit fre-
quency operation (3 minutes after
starting)
When the discharge temperature
(Td) is risen up
Ps 0.196 MPa
Pd 2.35 MPa and
after 30 seconds
Pd
1.96 MPa
❇
Example of operation of SV1
Compressor
Bypass
solenoid
valve (SV1)
(4-minute) (2-minute) (4-minute) (3-minute)
Start
Thermo.
OFF Thermo.
ON
Defrost
Stop
2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)]
<Variable capacity unit>
Ps
0.098 MPa
Pd 2.65 MPa
ON when the high
pressure (Pd) ex-
ceeds the control
pressure limit.
SV4
ON OFF
—
—
—
Normally ON
—
Pd 2.70 MPa
Pd 2.35 MPa and
after 30 seconds.
and
• Pd
1.96 MPa
or
Ps
0.34 MPa
115 ˚C
(No. 1 compressor)
100˚C
(No. 2 compressor)
Td