Mitsubishi Electric ECOV-X37VA Manuel D'installation page 51

11-4. Test run procedure
11-4-1. Initial processing
It will take approximately two minutes (max. five minutes) for the low pressure to be displayed on the digital display on the
MAIN board after the unit is turned on.
If the low pressure does not appear on the digital display after a while, check for wiring errors.
1) What to expect during the initial processing
During the initial setting of the LEV, the LEV will make clicking noises, but this is not a malfunction.
During the initial setting of the circuit board, a value will appear on the digital display for a few seconds.
11-4-2. Operation
[1] Operate the unit operation. (Capacity control)
1) Check that dip switch SW3-5 is
Capacity control operation is performed using the inverter.
2) Set the ON/OFF switch (SW1) to
The unit starts operating.
Low pressure will be displayed on the digital display on the MAIN board.
ON
Switches 1 to 5 are ON, and switches 6 to 10 are OFF in the figure on the left.
1 2 3 4 5 6 7 8 9 10
11-4-3. Stop the unit. (Pump down stop)
[1] Stop the unit.
Set the ON/OFF switch (SW1) to
The unit stops operating.
• To prevent refrigerant flood-back upon resuming operation, turn off the switch (SW1) after low-pressure cutoff from pump
down operation.
[2] Stop the unit after pump down. (Pump-down mode)
Use the pump-down mode when closing the solenoid valve on the liquid line, recovering the refrigerant to the liquid receiver,
and providing maintenance for the load-side equipment.
1) Set the ON/OFF switch (SW1) to
2) Set the unit power to
3) Set dip switch SW3-5 to
start the pump-down mode.
4) Set the unit power to
The unit operates at the low-pressure cutoff OFF-threshold of 0.9 MPa and the ON-threshold of 1.1 MPa.
After completing the pump down process, set the ON/OFF switch (SW1) to
dip switches SW3-5 and 3-1 to
* Do not operate the unit in the above settings except to perform maintenance.
* Even after pump down stop, approximately 1 MPa of refrigerant will remain on the low-pressure side. Refrig-
erant may spew out during servicing.
• If the system is overcharged with refrigerant, performing a pump-down operation through the liquid service valve in high am-
bient temperature (30°C or above) may result in high-pressure cut off.
• If a pumpdown is performed on a system with refrigerant overcharge and is then stopped for a long time, the pressure may
rise. Do not perform a pumpdown, and instead stop the unit by turning off the operation switch.
.
.
.
to stop the operation.
.
to start the fixed frequency mode. Set dip switch SW3-1 on the unit to
and the ON/OFF switch (SW1) to
with the unit power set to
51
to start the operation.
to stop the operation, and set
.
to
WT09614X03_GB