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Instructions
When the power is not supplied to the unit,
remove the coil, and open forcibly using a
magnet.
(Make sure to restore before restarting the
equipment. If it is operated with the col
removed, it could break down the unit.)
Fig. 15
6 – Vacuum dehydration
• Never use the compressor to evacuate the system.
• Connect a vacuum pump to both the LP & HP sides for quicker and efficient evacuation.
• Pull down the system under a vacuum of 500 µm Hg (0.67 mbar) absolute.
• Do not use a megohmmeter or apply power to the compressor while it is under vacuum as this may cause internal damage.
• After the airtight test, connect the vacuum pump to the low pressure side service port and high pressure side service port, and evacuate (refer fig. 15).
• Use always a vacuum pump to the equipment.
• Check the low pressure with the gauge manifold or vacuum gauge.
• When the unit is not energized, remove the coil from the medium pressure suction solenoid valve, and open it forcibly using a special magnet.
• When the unit is energized, turn the dip switch SW5-7 to ON (Up) to turn on the unit's power supply. The electronic expansion valve and solenoid valve in
the unit open. The vacuum pump is connected to the low pressure side only at that time.
6.1. Charge of condensing unit oil
• On the way of vacuuming, refill condensing unit oil from the service port.
• When the unit is not energized, remove coils from the hot gas bypass solenoid valve and oil return solenoid valve, and open the solenoid valve forcibly
using a special magnet.
• When the unit is energized, turn off the unit's power supply, turn the dip switch SW5-7 to ON (Up), and turn the power ON. The electronic expansion
valve and solenoid valve in the unit open. Make sure to turn SW5-7 to OFF (Down) when the work is over. The vacuum pump is connected to the service
port at the low pressure side only at that time.
• In the event that the pipe is long or there is an oil sump in the evaporator, the condensing unit oil retained in the compressor becomes insufficient.
Charge additional condensing unit oil according to (1) and (2) below.
• After charging the additional oil, confirm that 7-segment display "C32 (Level switch)" indicates "1 (With oil)". When the oil is insufficient, it indicates "0".
(After stopping the freezing operation, for example, the oil level may turn to "0" temporarily because of the pressure difference in the compressor. If it
indicates "0" continually while the compressor is running, refill additional oil.)
When the left 3 of 7-segment shows C32, the third digit from the right indicates the OLS1-2 status.
• If the condensing unit oil becomes insufficient during operation, tripping OLS1-2, the oil level alarm "oPE88-1" or oil level error "E88-1" is indicated on
7-segment display. (Dip switch SW6-5 OFF is for Alarm or ON for Error.) When the alarm or error occurs, refill additional condensing unit oil.
• Time of oil level low with OLS1-2 during compressor running can be summed and checked with 7-segment display "C42", which displays "Accumulated
time of CM1 ON and OLS1-2 OFF".
© Danfoss | Climate Solutions | 2023.02 | LCA012A024
Low pressure side service port
High pressure side service port
Middle pressure side service port
Oil service port
118A5495A - AN405821998738en-000102 | 13
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