EN - 41
EN - 40
Oil Level Control Method
Oil Replenishing Method
For the detailed method of adding oil, refer to the Engineering Service Manual “Compressor Oil Adding Procedure.”
(1) Turn the ground fault interrupter and operation switch S1 to “OFF” to stop the operation of the refrigeration unit.
(2) Confirm that the access ports of the high pressure / low pressure service valves and oil service valve are closed
(back seated position), and connect service piping (SPK-TU127 and SPK-TU126) with an attached (closed) joint
valve to each access port.
<High pressure / Low pressure service valve: Connect SPK-TU127, Oil service valve: Connect SPK-TU126>
(3) Before adding oil, the refrigerant in the refrigerant circuit needs to be released. By using the following procedure,
enter “Evacuation mode” (electronic expansion valve and solenoid valve are open).
[1] While keeping the ground fault interrupter “OFF,” turn
operation switch S1 to “ON.”
[2] Turn ON the DIP switch SW13-1 on the control PCB,
and set the slide switch SW15 to [CHECK] and then
turn ON the ground fault interrupter.
[3] The digital display sequentially indicates “Low
pressure→High pressure→Unit outlet pressure→uAcU”
and the electronic expansion valve and solenoid valve
will open.
(4) Set the high pressure / low-pressure service valves slowly open the joint valve attached to the service piping to
release the refrigerant in the refrigerant circuit. After releasing the refrigerant, connect an extension pipe (copper
pipe or charging hose) to the joint valve of the oil service valve.
When setting each service valve to the front seat, recheck in advance that there are no loose
connections in the nut of each service valve, or in the joint of the service piping.
A loose nut or pipe joint may cause the refrigerant to leak out.
(5) Set the rotary switch (knob) to [OPERATION MODE] and turn ON the DIP switch
SW13-7 for activating “Oil level confirmation mode.” Next, connect the manifold
gauge set exclusively for CO
2
refrigerant and vacuum pump to the service
piping attached to the high pressure / low pressure service valves, and set the
oil service valve to open seat position while applying evacuation, open the joint
valve to suck up oil and add oil until the oil level reaches the upper limit.
<Digital display example> (E.g.) Oil level indication before and after adding oil
Caution
DIP switch SW13
Upper limit
Mid level
Lower limit
Lower limit indication
Upper limit indication
Slide switch SW15
DIP switch SW13
CONTROL
CHECK
01_OCU-CR1000VF8A.indd 40
2019/08/27 10:56:09
