31-5000001 Rev. 6
15
ENGLISH
Step 3 - Installation of the Outdoor Unit (Cont.)
Connections Cautions
Model
4U36MS2VHB
3U24EH2VHA
3U24MS2VHB
2U18MS2VHB
2U20EH2VHA
Connection priority is
largest indoor unit on
lowest terminal set (D),
and install remaining
indoor units from
bottom to top.
A
B
C
When there are 2
indoors, the prior
service valves are
D C
C B
C B
B A
B A
When there are 3
indoors, the prior
service valves are
D C B
C B A
C B A
/
/
When there are 4
indoors, the prior
service valves are
D C B A
/
/
/
/
NOTE:
For better oil return and more reliable system, please execute as the above when connecting indoor unit.
NOTE:
No connection priority on 4U36EH2VHA.
LED
1
2
3
4
5
Message
Status
OFF
Unit not connected
ALL Flashing
Automatic checking impossible
, all units connected wrong
ALL ON
All units connected correctly
ON
Flashing
Flashing
ON
Flashing
ON:
unit connected correctly
Flashing:
unit connected wrong, need to change the wiring manually
between 2, 3, and 5
ON
Flashing
Flashing
ON
ON
ON:
unit connected correctly
Flashing:
unit connected wrong, need to change the wiring manually
between 2 and 3
Only one LED flashing
A
B
INSTALLATION INSTRUCTIONS
Model Number
Factory
Charge
Total Pipe
Length of
factory charge
Additional
charge rule*
Branch
Maximum
pipe length
System
Maximum
pipe length
Minimum pipe length
Unit
oz
ft
oz/ft
ft
ft
ft
2U20EH2VH*
99
100
0.2
82
164
6 ft per indoor and 20 ft per system
2U18MS2VH*
49.5
50
0.2
65
98
6 ft per indoor and 20 ft per system
3U24EH2VH*
99
100
0.2
82
197
6 ft per indoor and 20 ft per system
3U24MS2VH*
67
75
0.2
82
197
6 ft per indoor and 20 ft per system
4U36MS2VH*
113
100
0.2
82
230
6 ft per indoor and 25 ft per system
4U36EH2VH*
113
131
0.2
82
230
6 ft per indoor and 25 ft per system
Refrigerant Charge and Pipe Length Information
