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EN - 40
ENGLISH
Oil Replenishing Method
(6) After adding oil, close the joint valve of the oil service valve and remove the extension pipe, and continue
evacuation from the high pressure / low pressure service valves. (Continue until reaching vacuum level of 133 Pa
(1 Torr) and further continue for one to three hours)
(7) After applying evacuation, turn OFF the operation switch S1 and then return the slide switch SW15 to [CONTROL]
and the DIP switch SW13-1 to “OFF”.
Next, return the DIP switch SW13-7 to “OFF” and the rotary switch (knob) to [OPERATION].
(8) After removing the vacuum pump, connect a refrigerant cylinder to the manifold gauge set, and charge the
refrigerant from the high pressure service valve in liquid state. When liquid refrigerant can no longer be added,
close the access port of the high pressure service valve, activate the refrigeration unit’s cooling operation to adjust
the refrigeration quantity from the access port of the low pressure service valve.
[1] You must not charge liquid refrigerant from the access port of the low pressure service valve
under any circumstances.
[2] For adjustment of the refrigerant quantity, follow instructions in “Adjusting Refrigerant Quantity
of the Refrigeration Unit” in “Adjustment during Operation.”
(9) After completing the refrigerant quantity adjustment, close the valve of the refrigerant cylinder and access port
of the low pressure service valve, and then slowly open the purge valve of the manifold gauge set to release the
remaining refrigerant in the service piping and manifold gauge set.
(10) After completely releasing the refrigerant in the pipes, remove the service piping and attach a nut at the access
port (fastening torque: 13 ± 1 N·m). At the end of operations, check for a loose gland nut (fastening torque: 10 ± 1
N·m) at each service valve and fasten again, and then attach the cap (fastening torque: 30 ± 5 N·m).
Installation of an Alarm System
This refrigeration unit has a variety of protection devices for securing safety. When the ground fault protector or other
protection device is activated, and the alarm system or temperature control system is insufficient, cooling operation is
stopped for many hours thereby damaging the food items.
To enable prompt actions at such time, an alarm system or temperature control system should be considered at the
time of plan development.
External Alarms
This refrigeration unit is capable of delivering alarm output during abnormality (no voltage contact: contact capacity
Maximum 250V 3A).
During unit abnormality, the alarm output between the External alarm terminal base 1 and base 2 is turned ON
(continuity between the contacts). Connection of an external alarm circuit (local wiring) is recommended. External
alarm power should be furnished separately from the refrigeration unit power.
Detail of abnormality alarm content is shown in the table below.
Oil Level Control Method
Caution
About Alarms
Buzzer stopping switch
Buzzer
External power source
Maximum 250V 3 A
BZ
①
②
External alarm terminal base
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