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31-5000564 Rev. 1 19
ENGLISH
Step 3 - Installation of the Outdoor Unit (Cont.)
LED A B C D E Message
LED status
example for
3U24MS2HD*
model
OFF No power to unit
ALL Flashing Outdoor unit searching for indoor units at initial start-
up. If flashing continues, check wiring for proper type and
connections
ALL ON All units connected correctly
ON Flashing Flashing ON Flashing ON: unit connected correctly
Flashing: IDU not communicating. Check wiring and
connections among B, C & E
Only one LED flashing
INSTALLATION INSTRUCTIONS
D. Wiring Check Test
Turn off power at the disconnect. Move all dip
switches in the SW1 bank to ON. When power is turned
on, the LED display will alternate the compressor
frequency and CH (check). The system will run through
each unit (A, B, and C), cycling each EEV while testing
the wiring. A successful test will be indicated by the
corresponding LED displaying a constant green (1=A,
2=B, 3=C). Mis-wired units will generate an EC on the
display, with the corresponding LED flashing green.
Note: This LED display layout only
applies to 4U36MS2HDA1
Line Set Connections
Model 4U36MS2HDA1 3U24MS2HDA1 2U18MS2HDA1 2U20EH2VHA 3U24EH2VHA
Connection priority
is largest indoor unit
on lowest terminal
set (D), and install
remaining indoor units
from bottom to top.
When there are two
indoors, the prior
service valves are
D C C B B A B A C B
When there are three
indoors, the prior
service valves are
D C B C B A / / C B A
When there are four
indoors, the prior
service valves are
D C B A / / / /
NOTE: Please execute as the above when connecting indoor unit for better oil return and more reliable system.
NOTE: No connection priority on 4U36EH2VHA1
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