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4. Installing the refrigerant piping
4.7. Precautions when reusing existing R22 refrigerant pipes
• Refer to the flowchart below to determine if the existing pipes can be used and if it is necessary to use a filter dryer.
• See below for oil condition.
Clear to slight yellow color → Normal
Black or brown → Pipe cleaning is necessary.
• 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.
• If pipes with a diameter of ø19.05 mm are used for RP4-6, DIP switch SW8-1 on the control board must be switched to ON.
The existing pipe thickness meets specifi-
cations and the pipes are not damaged.
Check if the existing air conditioner can operate.
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.
The existing pipes can be reused.
Attach the new air conditioner.
A
E
A
D
≤
RP3 : A+B+C
50
≤
RP4-6 : A+B+C(+D)
75 m
Fig. 4-7
5. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain pan (optional parts).
Measure the existing pipe thickness and check
for damage.
The existing air conditioner cannot operate.
Use a refrigerant collecting device to collect the refrigerant.
Check the oil condition when collecting the refrigerant.
Oil is clean.
C
A
B
D
C
A
B
B–C
≤
B–D
8 m
C–D
The existing pipe thickness does not meet
specifications or the pipes are damaged.
Oil is dirty.
When the compressor bearings are
glazed, rotation scratches are present,
or the compressor breaks down, iron
particles or oil deterioration will blacken
the oil.
Disconnect the existing air conditioner from the pipes and
clean the pipes using a cleaning device.
Attach a filter dryer. (Sold separately)
4.8. For twin/triple combination
Refrigerant piping limitation of length, height difference are shown in the figure. (Fig.
4-7)
A Indoor unit
B Outdoor unit
C Multi distribution pipe (option)
D Height difference (Indoor unit-Outdoor unit) Max. 30 m
E Height difference (Indoor unit-Indoor unit) Max. 1 m
The existing pipes cannot be reused.
Use new pipes.
7
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