Precautions When Reusing Existing R22 Refrigerant Pipes; Service Tools - Mitsubishi Electric PUHZ-P200YKA.UK Service Manual

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name
Gauge manifold
1
Charge hose
2
Electronic scale
3
Gas leak detector
4
Adaptor for reverse flow check
5
Refrigerant charge base
6
Refrigerant cylinder
7
Refrigerant recovery equipment
8

2-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES

(1) Flowchart
• 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 technological data materials to confirm if
the pipes can be used.
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
▼
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
▼
Test run
OCH582B
· Only for R410A
· Use the existing fitting specifications . (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
· Only for R410A
· Use pressure performance of 5.09MPa·G or over.
· Use the detector for R134a, R407C or R410A.
· Attach on vacuum pump.
· Only for R410A
· Cylinder with syphon
Measure the existing pipe thickness and
check for damage.
• I f 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
P200/250 models.
5
Specifications
—
—
· Top of cylinder (Pink)
—
The existing pipe thickness does not meet
specifications or the pipes are damaged.
▼
The existing pipes cannot be reused.
Use new pipes.