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English
〈
Cautions for check operation
〉
• If the system is started within about 12 minutes after the outdoor/
indoor units are turned ON, the compressor will not run and H2P
lights up. Before starting an operation, always verify that the LED dis-
play shows the contents of the table in “
(6)”.
• The system may require up to 10 minutes until it can start the com-
pressor after an operation start. This is a normal operation to equal-
ize the refrigerant distribution.
• The check operation does not provide any means of checking the
indoor units individually. For that purpose, perform normal operation
using the remote controller after the check operation.
• Check operation is not possible in other modes such as collection
mode.
• If the setting of indoor remote controller is changed before the check
operation, it may not be performed correctly and malfunction code
“UF” may be displayed.
Remote controller displays malfunction code
11-4 Check of normal operation
After the check operation is completed, operate the unit normally. (Heat-
ing is not possible if the outdoor temperature is 75 °F or higher. Refer to
the Operation manual.)
Check the below items.
•
Make sure the indoor and outside units are operating normally (If
a knocking sound can be heard in the liquid compression of the
compressor, stop the unit immediately and then energize the
heater for a sufficient length of time before restarting the opera-
tion.)
•
Run each indoor unit one at a time and make sure the corre-
sponding outside unit is also running.
•
Check to see if cold (or hot) air is coming out of the indoor unit.
•
Press the fan direction and fan strength buttons on the indoor unit
to check if they operate properly.
NOTE
〈
Cautions for normal operation check
〉
•
Once stopped, the compressor will not restart in about 5 minutes
even if the
Run/Stop
button of an indoor unit in the same system
is pressed.
•
When the system operation is stopped by the remote controller,
the outside units may continue operating for further 5 minutes at
maximum.
•
If the system has not undergone any check operation by the test
operation button since it was first installed, an malfunction code
“U3” is displayed. In this case, perform check operation referring
to “
”.
•
After the test operation, when handing the unit over to the cus-
tomer, make sure the electric box lid, the service lid, and the unit
casing are all attached.
12. CAUTION FOR REFRIGERANT LEAKS
DANGER
•
Refrigerant gas is heavier than air and replaces oxygen. A massive
leak could lead to oxygen depletion, especially in basements, and
an asphyxiation hazard could occur leading to serious injury or
death.
(Points to note in connection with refrigerant leaks)
Introduction
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.
The VRV System, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-combustible
refrigerant. Nevertheless care must be taken to ensure that air condi-
tioning facilities are installed in a room which is sufficiently large. This
assures that the maximum concentration level of refrigerant gas is not
exceeded, in the unlikely event of major leak in the system and this in
accordance to the local applicable regulations and standards.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maximum
concentration of refrigerant is directly related to the humanly occupied
space in to which it could leak.
The unit of measurement of the concentration is lb./ft
3
( the weight in lb.
of the refrigerant gas in 1ft
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
1.
direction of the refrigerant flow
2.
room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
Malfunc-
tion code
Installation error
Remedial action
E3
E4
F3
F6
UF
U2
The stop valve of an out-
side unit is left closed.
Open the stop valve.
Check referring to the table in
“
”.
U1
The phases of the power
to the outside units are
reversed.
Exchange two of the three
phases (L1, L2, L3) to make a
positive phase connection.
U1
U2
U4
No power is supplied to
an outside or indoor unit
(including phase interrup-
tion).
Check if the power wiring for the
outside units are connected cor-
rectly.
(If the power wire is not con-
nected to L2 phase, no malfunc-
tion display will appear and the
compressor will not work.)
Check if the ground fault circuit
interrupter in the outside unit is
ON.
UF
Incorrect transmission
between units
Check if the refrigerant piping
line and the unit transmission
wiring are consistent with each
other.
E3
F6
UF
U2
Refrigerant overcharge
Recalculate the required
amount of refrigerant from the
piping length and correct the
refrigerant charge level by
recovering any excessive refrig-
erant with a refrigerant recovery
machine.
E4
F3
Insufficient refrigerant
•
Check if the additional refrig-
erant charge has been fin-
ished correctly.
•
Recalculate the required
amount of refrigerant from the
piping length and add an ade-
quate amount of refrigerant.
U7
UF
If an outside multi termi-
nal is connected when
there is one outside unit
installed
Remove the line from the outside
multi terminals (Q1 and Q2).
UF
E4
The operation mode on
the remote controller was
changed before the check
operation.
Set the operation mode on all
indoor unit remote controllers to
“cooling.”
HJ
The heat source water is
not circulating.
Make sure that the water pump
is running.
U3
The check operation has
not been performed.
Perform the check operation.
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