7
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.
• 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 the diameter of the existing gas side pipe is bigger than the specified diameter, turn SW8-1 on.
Measure the existing pipe thickness and check
for damage.
The existing pipe thickness meets specifi-
cations and the pipes are not damaged.
The existing pipe thickness does not meet
specifications or the pipes are 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.
The existing pipes cannot be reused.
Use new pipes.
4. Installing the refrigerant piping
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
A
A
A
C
E
D
D
B
C
A
B
B–C
B–D
≤
8 m
C–D
RP71 : A+B+C
≤
50
RP100-140 : 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 socket or the drain pan (option).
RP35, 50
RP60-140
Drain socket
PAC-SG61DS-E
Drain pan
PAC-SG63DP-E
PAC-SG64DP-E
Attach the new air conditioner
Perform the airtight test, vacuum air purging, ad-
ditional refrigerant charging (if necessary), and
gas leak check.
RP35–RP71
RP100–RP140
* If the existing air conditioner cannot operate, use
a refrigerant recovery device to collect the refrig-
erant.
* In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes
for RP100-140 models.
Use new pipes for RP35-71 models.
Test run
Replacement
operation
* Reter to page 9
Содержание Mr.Slim PUHZ-RP-HA2
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