Drainage Piping Work - Mitsubishi Electric PUHZ-RP-HA4 Installation Manual

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.
• 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 heat pump unit can operate.
▼
After operating the cooling system for about 30
minutes, do a pump down work.
▼
Disconnect the existing heat pump unit from the
pipes.
▼
Attach the new heat pump unit.
▼
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
▼
Test run
* Refer to 7..
<Limits of refrigerant piping installation>
RP71 : A+B+C 50 m
RP100-140 : A+B+C(+D) 75 m
RP200, 250 : A+B+C(+D)(+E) 120 m
* "D" is for triple".
* "E" is for four (quadruple).
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
Drain socket
Drain pan PAC-SG63DP-E
Measure the existing pipe thickness and
check for damage.
* If the existing heat pump unit 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 RP100-50 models.
Use new pipes for RP35-71 models.
Indoor unit
Outdoor unit
Multi distribution pipe (option)
Height difference (Indoor unit-
Outdoor unit) Max. 30 m
Height difference (Indoor unit-
Indoor unit) Max. 1 m
A: Main piping
B, C, D, E: Branch piping
Fig. 4-10
RP60, 71
PAC-SG61DS-E
PAC-SG64DP-E
The existing pipe thickness does not meet
specifications or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.
4.8. For twin/triple/quadruple combination (Fig. 4-10)
• When this unit is used as a FREE COMPO MULTI unit, install the refrigerant
piping with the restrictions indicated in the drawing on the left. In addition, if the
restrictions are going to be exceeded, or if there are going to be combinations of
indoor and outdoor units, refer to installation instructions for the indoor unit for
details about the installation.
Permissible total
Outdoor unit piping length
A+B+C+D+E
RP71
50 m and less
RP100-140
75 m and less
RP200
120 m and less
RP250
| B-C | or | B-D | or
| B-E | or | C-D | or
Outdoor unit
RP71 - 250
RP100-50
PAC-SH97DP-E
▼
A+B or A+C Charge-less
or piping length
A+D or A+E A+B+C+D+E
— 30 m and less
30 m and less
—
30 m and less
100 m and less
No. of bends
| C-E | or | D-E |
Within 15
8 m and less
9