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12.3 Test operation method
RDSW01
Operation control selection
RDSW02
Operational speed selection
• The cut-in pressure setting should be at least 0.03 MPa higher than the cut-off pressure setting.
The diagram below illustrates settings of +0.23 MPa and +1.32 MPa.
When using settings of 1.00 MPa and up, set the first decimal place in accordance with A to D.
Setting example for 0.23 MPa
RSW03
Cut-in pressure setting
Cut-off pressure difference (low-pressure constant control)
• The settings for the cut-in pressure and the cut-off pressure should always be in the saturation pressure range of
the evaporation temperature used in the condensing unit. (Refer to the table below.)
When the pressure is set outside this range, control is performed to use the nearest upper limit or lower limit value
within the range. Also, an error is displayed if the cut-in pressure is equal to or less than the cut-off pressure, and
the device will not operate. Be careful when choosing the settings.
Refrigerant used
R410A
• Set the operation control selection switch on the printed circuit board to [0] and power ON
the condensing unit (breaker).
• The test operation performs control to start and stop operations using the same cut-in
(operation start)/cut-off (operation stop) pressures as a conventional single-speed device.
• Set the operating pressure and cut-off pressure setting switch and the cut-in pressure
setting switch before operation.
• Set the cut-off pressure using MPa units up to two decimal places and indicate whether it is
positive or negative. The diagram below illustrates settings of +0.05 MPa and +1.15 MPa.
When using settings of 1.00 MPa and up, set the first decimal place in accordance with A, or
with B .
Setting example for +0.05 MPa
RSW01
RSW02
SW2
Cut-off setting pressure
Setting pressure (low-pressure constant control)
RSW04
Cut-off pressure difference (low-pressure constant control)
Range of possible pressure settings and [evaporation temperature]
Cut-in pressure
Cut-off pressure
Setting example for +1.15 MPa
RSW01
SW2
Cut-off setting pressure
Setting pressure (low-pressure constant control)
Setting example for 1.32 MPa
RSW03
RSW04
Cut-in pressure setting
0.30 MPa [−20°C] to 1.35 MPa
0.00 MPa
to 0.99 MPa [10°C]
29
Setting for first
decimal place
RSW02
Setting for first
decimal place
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