Method of Troubleshooting Si30-408
88 Troubleshooting
3.6 Structure and Operation of Two-way Solenoid Valve
In heating operation, when each standard speed outdoor unit does not operate, the two-way
solenoid valve stops each gas pipe.
This valve is external equalizing type, i.e. pressure difference to move the spool can be made
outside of valve.
The valve "closes" when coil is energized, "opens" when not be energized.
The shape of the valve is similar to four-way valve and approx. 0.35MPa is required for
operation.
Principal of Valve
Operation
Basically, the principal of valve operation is the same as four-way valve. Below figure shows the
operation of valve.
Operation mode In operation of standard outdoor unit
In no operation of standard outdoor
unit
Cooling operation
Valve state: “open: not energized”
The line including the valve functions
as a low pressure line of each
standard speed outdoor unit.
Valve state: “open: not energized”
The valve is opened to collect
refrigerant in INV unit in order to
prevent refrigerant from accumulate in
the unit stopping.
Heating operation
Valve state: “close: energized”
The line functions as a discharge gas
line of each standard speed outdoor
unit.
Valve state: “open: not energized”
The valve is closed in order to prevent
discharge gas from coming into the
unit stopping.
Energized
Not energized
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust
Exhaust to
equalizer line
High
High
High
High
High
High
High
High
High pressure
applied
High pressure
applied
Exhaust to
equalizer line
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