Daikin VRV K - Malfunction of Transmission between Outdoor Units

Troubleshooting Si-95
106 Troubleshooting Inverter K Series
2.30 Malfunction of Transmission Between Outdoor Units
Remote Controller
Display
UU
UU
77
77
Supposed Causes ■ Improper connection of transmission wiring between outdoor unit and outdoor unit outside control
adaptor
■ Improper cool/heat selection
■ Improper cool/heat unified address (outdoor unit, external control adaptor for outdoor unit)
■ Defect of outdoor unit PC board (A1P)
■ Defect of external control adaptor of outdoor unit (option)
Troubleshooting
(VF056)
NO
YES
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
YES
NO
C/H SELECT is set to "IND".
Cool / heat selection is unified.
C/H SELECT
is set to "Unfied MAIN."
NO
Is the indoor
/ outdoor unit transmission
wiring normal?
C/H SELECT
is set to " Unfied SUB."
YES
NO
Check
and see if the following items
are normal.
NO
Does
a malfunction occur when
the cool / heat selector is set
to "IND?"
YES
Set C/H SELECT to "IND."
The cool / heat unified address for
outdoor units in outdoor - outdoor
unit transmission is duplicated.
Set the address correctly.
YES
NO
NO
YES
YES
Replace the outdoor unit outside
control adaptor.
Replace the outdoor unit PC
board (A1P).
Outdoor unit outside control adaptor
•Is it energized?
•Does the cool/heat unified address match?
Outdoor unit (unified main unit)
•Is it energized?
•Does the cool/heat unified address match?
Fix the problem.
SI-95.BOOK Page 106 Friday, March 31, 2000 10:59 AM