7
3-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES
(1) Flowchart
Connecting a new air conditioner
Flaring work should be done so that flare meets the dimension for R410A.
Use flare nut provided with indoor and outdoor unit.
When using gas piping of
:
19.05mm for RP100, 125 or 140.
Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.
This is to keep the pressure on pipes within permissible range.
●
Use different diameter joint or adjust the piping size by brazing.
When using pipes larger than specified size for RP35, 50, 60 or 71.
Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.
This is to prevent oil flow ratio from lowering due to the decrease in flowing refrigerant.
●
Use different diameter joint or adjust the piping size by brazing.
When existing pipes are specified size.
The pipes can be reused referring to TECHNICAL DATA BOOK (OCS05).
●
Use different diameter joint or adjust the piping size by brazing.
*
When using existing pipes for RP60/71VHA3 and RP100/125/140
Make sure that DIP SW8-2 on outdoor unit controller board is set to ON and perform
replacement operation.
+
Chemical compounds containing chlorine left in existing pipes are collected by replace filter.
●
The air conditioner automatically performs cooling operation through replace filter for about 2 hours.
Measure the existing pipe thickness and check for damage.
Check if existing air conditioner can operate.
Existing air conditioner can
operate.
Disconnect existing air con-
ditioner from piping.
Existing pipes can be reused.
In case the unit is RP35/50
or RP60/71VHA2
(1)
which
utilizes HAB oil.
In case the unit is RP60/71
VHA3 or RP100/125/140
which utilize ester oil or
ether oil.
Perform cooling operation
for about 30 minutes and
then do a pump down work.
Use a refrigerant recovery
equipment to recover the
refrigerant.
Existing air conditioner
cannot operate.
The existing pipe thickness meets speci-
fications and the pipes are not damaged.
The existing pipe thickness does not meet
specifications or the pipes are damaged.
Connect a new air conditioner.
Connect a new air conditioner.
Perform replacement operation.
·When performing replacement operation, make sure that DIP SW8-2 on outdoor unit controller board is
set to ON.
+
Chemical compounds containing chlorine left in existing pipes are collected by replace filter.
●
The air conditioner automatically performs cooling operation through replace filter for about 2 hours.
Existing pipes cannot be
reused. Use new pipes.
+
In case existing pipes were used
for gas or oil heat pump system,
be sure to clean the pipes for RP100-140 models.
Use new pipes for RP35-71 models.
Summary of Contents for PUHZ-RP100VHA3
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