Refrigerant Charging Procedure - Panasonic OCU-CR200VF5 Service Manual

Refrigerant Charging Procedure

Caution Make sure to close the vacuum valve of CO
1. Piping connection
1) Connect the joint valve of the service piping (SPK-TU125) and the manifold gauge set
exclusively for CO
2) Place a CO refrigerant cylinder on a platform scale, and connect the manifold gauge set by
2
using a CO charge hose or 1/4" pipe.
2
Low pressure service valve
Joint valve
3) Set the high pressure service valve to the Mid-position (the access port is open), and the low
pressure service valve to the back seated position.
Note: Do not charge the refrigeration unit with liquid refrigerant from the low pressure side
under any circumstances.
4) Tare the platform scale.
2. Refrigerant Charging
1) Open the joint valve and gradually charge the refrigeration unit with refrigerant.
In order to avoid overcharging, maintain the charging rate at approx. 20 g in 5 sec.
When it is difficult to adjust the charging speed by using the joint valve or the charging valve
of manifold gauge set, install a capillary tube between the CO
manifold gauge set.
Note: Do not install a capillary tube between the service piping and manifold gauge set.
2) When the liquid refrigerant no longer goes into the refrigeration unit, close the access port of
the high pressure service valve and make the refrigeration unit in cooling operation condition
to adjust refrigerant quantity using the access port of the low pressure service valve.
3) After completing refrigerant charge, close the refrigerant cylinder valve and check that the
access ports of the low pressure and high pressure service valves have been closed.
4) Gradually open the vacuum valve or purge port of the manifold gauge set, and release the
refrigerant remaining in the service piping, manifold gauge set, and charge hose (or 1/4"
pipe). Refer to "Service Pipe Connection/Disconnection Method".
refrigerant by using a CO
2
High pressure service valve
Service piping
CO manifold gauge set
2
Low side
gauge
CO
manifold gauge set.
2
charge hose or 1/4" pipe.
2
High side
gauge
Charging
valve
charge hose or 1/4" pipe
2
2
11
CO refrigerant cylinder
2
Blow valve
Platform scale
refrigerant cylinder and