Mitsubishi Electric PUHY-RP200 Service Handbook page 27

[ II Restrictions ]
(3) Reusability check of the existing transmission lines for Replace Multi units
Check the existing wires for damage to insulation by measuring the resistance between the lead and the
ground with a 500 V ohmmeter. If the insulation resistance is less than 100 M , replace the wires.
Use the flowcharts on the following pages to determine the reusability of the existing transmission lines.
Obtain the system configuration drawing, fill out the checklist, and make a decision based on them.
Existing transmission lines reusability checklist
1. Remote controller cable (MA remote controller)
(1) Length
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
2. Remote controller cable (ME remote controller)
(1) Length *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
3. Remote controller cable (system controller)
(1) Length *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
(5) System controller connection (Indoor unit
system/centralized control system)
4. Indoor-outdoor transmission line
(1) Refrigerant system (Single/Multiple)
(2) Length of transmission line to the farthest unit *1
(3) Cable size
(4) Number of cores
(5) Cable type (shielded/unshielded)
(6) Number of connected indoor units
5. Centralized control transmission line
(1) Length of transmission line to the farthest unit *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
6. Availability of system configuration drawing (Obtain one as
much as possible.)
7. Noise-related problems with the old units
(Write down the nature of the problem in the "Notes" column,
if any.)
8. Are there any high-frequency medical equipment in the adjacent
area that could cause noise-interference?
(Write down the specific nature of the concerns in the "Notes"
column, if any.)
*1: If the remote controller (ME/System controller) length exceeds 10 m, include the exceeded length in the calculation of the
transmission line length (indoor-outdoor transmission line/centralized control system).
HWE10010
Check items
- 18 -
Findings
m
mm
2
Cores
Shielded/Unshielded
m
mm 2
Cores
Shielded/Unshielded
m
mm
2
Cores
Shielded/Unshielded
Indoor/Centralized
Single/Multiple
m
mm 2
Cores
Shielded/Unshielded
units
m
mm
2
Cores
Shielded/Unshielded
Available/Not available
Available/Not available
Available/Not available
Notes
GB