Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
• Refer to the flowchart below to determine if the existing pipes can be used and if it is necessary to use a filter drier.
• If the diameter of the existing pipes is different from the specified diameter, refer to technical data materials to confirm if the
pipes can be used.
▼
▼
▼
▼
▼
▼
▼
Measure the existing pipe thickness and
check for damage.
The existing pipe thickness meets specifica
-
tions and the pipes are not damaged.
Check if the existing air conditioner can operate.
After operating the cooling system for about 30
minutes, do a pump down work.
Disconnect the existing air conditioner from the
pipes.
Attach the new air conditioner
Test run
The existing pipes cannot be reused.
Use new pipes.
• If the existing air conditioner cannot operate, use a
refrigerant recovery device to collect the refrigerant.
• In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes for
M200/250 models.
The existing pipe thickness does not meet
specifications or the pipes are damaged.
8
OCH737
2-3. PRECAUTIONS WHEN REUSING EXISTING R22/R410a REFRIGERANT PIPES
(1) Flowchart
[5] Service tools
Use the below service tools as exclusive tools for R32 refrigerant.
No.
Tool name
Specifications
1
Gauge manifold
· Only for R32
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
2
Charge hose
· Only for R32
· Use pressure performance of 5.09MPa·G or over.
3
Electronic weighing scale
—
4
Gas leak detector
· Use the detector for R134a, R407C, R410a or R32.
5
Adaptor for reverse flow check
· Attach on vacuum pump.
6
Refrigerant charge base
—
7
Refrigerant cylinder
· Only for R32 · Top of cylinder (Pink)
· Cylinder with syphon
8
Refrigerant recovery equipment
—
