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[2-10 Restrictions on Refrigerant Pipes ]
2-10-2
Restrictions on Refrigerant Pipe Size
(1) Between outdoor unit and the first twinning pipe (Part A)
Outdoor units
72
96
144
192
(2) Between BC controller and indoor unit (Sections a, b, c, d, e, and f )
Indoor unit
P06, P08, P12, P15, P18
P24, P27, P30
P36, P48, P54
P72
P96
(3) Between the main and sub BC controllers (Section C)
Indoor unit
- P72
P73 - P108
P109 - P126
P127 - P144
P145 - P168
Select the proper size pipes for the main unit based on the total capacity of the indoor units that are connected to both sub
BC controllers. Select the proper size pipes for the sub controller side based on the total capacity of the indoor units that are
connected to the sub controller.
HWE13080
Refrigerant pipe size
Low-pressure pipe
High-pressure pipe
ø19.05 [3/4"]
ø15.88 [5/8"]
ø22.2 [7/8"]
ø19.05 [3/4"]
ø28.58 [1-1/8"]
ø22.2[7/8"]
Refrigerant pipe size
Liquid pipe
ø6.35 [1/4"]
ø9.52 [3/8"]
ø12.7 [1/2"]
Refrigerant pipe size (Brazed connection on all models )
Liquid pipe
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
- 57 -
Connection to outdoor unit and BC controller
Low-pressure pipe
ø19.05 [3/4"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
Indoor unit connection
(Flare connection for all models)
Gas pipe
Liquid pipe
ø12.7 [1/2"]
ø6.35 [1/4"]
ø15.88 [5/8"]
ø9.52 [3/8"]
ø19.05 [3/4"]
ø12.7 [1/2"]
ø22.2
[7/8"]
High-pressure gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
Unit : mm [inch]
High-pressure pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
Unit : mm [inch]
Gas pipe
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2
[7/8"]
Unit : mm [inch]
Low-pressure gas pipe
ø19.05 [3/4"]
ø22.2 [7/8"]
ø28.58 [1-1/8"]
GB
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Troubleshooting
Need help?
Do you have a question about the PURY-HP72 and is the answer not in the manual?
Questions and answers
what is the set up mode for recovery, and charging of sys?
Why can control my indoor unit with centralize control
You may not be able to control your Mitsubishi Electric PURY-HP72 indoor unit with centralized control for the following reasons:
1. The power jumper connector on the outdoor unit may not be correctly set. It should be connected to CN40 on only one outdoor unit.
2. The central control switch (SW5-1) on the control board of all outdoor units must be set to "ON."
3. Address settings may not be correctly configured. The main indoor unit should be assigned the smallest address (e.g., IC00), and correct port number settings are required.
4. If using a remote controller alone, an interlock setting from the remote controller is needed.
5. Both ME and MA remote controllers cannot be connected to the same indoor unit group.
6. System controller power issues may occur if the outdoor unit fan rotates due to external forces, causing the system controller to detect an error.
7. Improper wiring or incorrect voltage at TB7 may also prevent operation.
Check each of these conditions to ensure proper centralized control.
This answer is automatically generated
Why can’t control indoor unit with centralize control and stay the MA control set up can’t. Control the mode
The Mitsubishi Electric PURY-HP72 indoor unit cannot be controlled with centralized control and the mode control setup does not function due to the following reasons:
1. Central control is not possible if the indoor/outdoor transmission line is used, even if TB7 terminals are daisy-chained.
2. Shielded cables must be used, and the connection must only be made after confirming the voltage is below 20 VDC.
3. Improper connection of the transmission line for centralized control, such as not correctly daisy-chaining terminals M1 and M2 or not short-circuiting the earth and S terminals on TB7.
4. If a power supply unit is not connected to the centralized control line, the power jumper connector must be moved from CN41 to CN40 on one outdoor unit—if this is not done, mode control will not function.
5. Overlapped indoor unit addresses or noise interference on the remote controller lines can also prevent proper control.
6. Failure to set one MA remote controller to MAIN or exceeding its capacity can result in control failure.
All these factors must be correctly configured for centralized and mode control to function properly.
This answer is automatically generated