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Malfunction code
Main
Sub code
code
Master/sub 1
01
U7
02
- /03
11
01
U9
18
UA
20
27
28
31
53
01
UH
01
UF
05
16. Operation of the unit
Once the units are installed and test operation of outdoor units,
Branch Selector units and indoor units are finished, the operation of
the system can start.
For operating the indoor units, the user interface of the indoor units
should be switched ON. Refer to the indoor unit operation manual for
more details.
17. Maintenance and service
17.1.
Maintenance introduction
In order to ensure optimal operation of the unit, a number of checks
and inspections should be carried out on the unit at regular intervals,
preferably yearly.
This maintenance shall be carried out by the installer or service agent.
English
Contents
Faulty wiring to Q1/Q2 or indoor- outdoor.
• Too many indoor units are connected to F1/F2 line.
• Faulty wiring between units.
• System mismatch. Wrong type of indoor units com-
bined (R407C, Mini-split, etc).
• Indoor unit malfunction.
Connection malfunction over indoor units or type
mismatch (R407C, Mini-split, etc).
Wrong combination (different series (e.g. RXYQ and
RELQ), or different type (e.g. P type and T type)).
Assembly defect of indoor, Branch Selector and
outdoor units (e.g. different models, number of units or
part numbers, or different series are mixed).
Different type of Branch Selector units are combined
in the system. Combination of T type (BSQ-T*, BS-
Q54T*, BSF-Q54T*) and P type (BSVQ-PVJU, BSV-
Q36PVJU) cause error.
Wrong combination of outdoor units.
• Defect of Branch Selector units connecting position
or abnormality due to wiring error.
• Abnormality of Branch Selector units DIP switches
settings.
Auto address malfunction (inconsistency)
Auto address malfunction (inconsistency)
Stop valves closed.
Connect transmission wiring of Branch Selector units
and indoor units to "TO IN/D UNIT (F1, F2)" and trans-
mission wiring of other outdoor units to "TO OUT/D
UNIT (F1, F2)".
• Check indoor unit amount and total capacity con-
nected.
• Check connection.
Check if other indoor units have malfunction and con-
firm indoor unit mix is allowed.
Check if other indoor units have malfunction and con-
firm indoor unit mix is allowed.
Correct the units combination.
• Check and modify the number of indoor units that
are connected.
• Check the type of refrigerant for indoor and outdoor
units, and replace them with adaptable indoor/out-
door units in the case of inconsistency.
Configure the system with only T type Branch Selector
units.
Correct the units combination.
• Check that the wiring connection are correct, refer-
ring to the wiring diagram for Branch Selector units,
and correct if there are any errors.
• Check that the DIP switches settings are correct,
referring to the installation manual enclosed in
Branch Selector units package, or to the "Service
precautions" plate attached to the control box cover,
and correct if there are any errors.
Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialization is finished.
Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialization is finished.
Open stop valves.
17.2. Service precautions
DANGER: DO NOT TOUCH PIPING AND INTERNAL PARTS
See Safety considerations on page i.
CAUTION
When performing service to inverter equipment:
1 Do not open the control box cover for 10 minutes after the power
supply is turned off.
2 Measure the voltage between terminals on the terminal block
for power supply with a tester and confirm that the power supply
is turned off. In addition, measure points as shown in the figure
below, with a tester and confirm that the voltage of the capacitor in
the main circuit is less than 50 V DC.
Solution
44
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