5
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 HRP100, 125.
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 HRP71.
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 (OCS11).
●
Use different diameter joint or adjust the piping size by brazing.
* When using existing pipes for HRP71, 100, 125HA(2).
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 filter replacement for about 2 hours.
HRP·HA(2)
HRP·HA2R1
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 HRP·HA2R1
In case the unit is HRP·HA(2)
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.
OCH425D
