Refrigerant Charging - Panasonic OCU-CR400VF8 Operating Instructions And Installation Instructions

Refrigerant Charging

Evacuation (Perform after completing electrical wiring.)
To avoid inclusion of air or moisture in the refrigerant circuit, be sure to execute vacuum drying of the entire circuit by
using a vacuum pump, before charging refrigerant. By following procedure, execute evacuation after securely carrying
out airtight test.
(1) Connect electrical wiring
(2) Enter the Vacuum Mode by following sequence
- Check the Electrical Circuit Breaker to be OFF (No electric power charged to the unit)
- Turn the No.1 and 2 of 8P Dip Switch (SW13) ON. No. 3~8 shall be OFF.
- Set the Slide Switch (SW15) to [CHECK].
then,
- Turn the Electrical Circuit Breaker ON.
- Turn the Operation Switch (S1) to ON.
- Set the Rotary Switch (SW11) to [OPERATION]
- Check that [uAcU] is indicated in the 7-segment LED.
7-segment LED shall indicate
"Low Pressure → High Pressure → Unit outlet Pressure → [uAcU] → Low Pressure → ....".
Check Operation Switch (S1) is ON.
If yes, the unit is confirmed to enter Vacuum Mode (even though 7-segment LED is showing [uAcU], the unit is not
in the Vacuum Mode if (S1) is OFF).
In the Vacuum Mode, all electronic expansion and solenoid valves open.
(3) Evacuation
- Connect the vacuum pressure gauge and vacuum pump to the low pressure and high pressure service ports,
and set both the "Mid-position".
Explanation of each Seat Position
A:
Back seated position
(Turn the stem fully
counter-clockwise)
- Apply evacuation from the two ports.
- Evacuate down to 133 Pa (1 Torr), target level for evacuation,
and continue for 1 to 3 hours.
- Execute the refrigerant charging immediately after evacuation,
according to the charging procedure described in the next page.
B:
Mid-position
(Stem height approx. 15mm)
• High pressure
side Approx. 3 and
a half turns
• Low pressure side
Approx. 3 turns
EN - 21
C:
Front seated position
(Turn the stem fully clockwise)
Compressor
High pressure
service port
Low pressure
service port
Left side of refrigeration unit