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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
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