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Installation
EDUS39-605
35
Installation of Outdoor Units
Remote controller displays an error:
Temperature adjustment operation confirmation
•
After the test operation is over, operate the unit normally.
Heating is not possible if the outdoor temperature is 75°F or
higher.
•
Make sure the indoor and outdoor units are operating
normally.
If a knocking sound can be heard in the liquid compres-
sion of the compressor, stop the unit immediately and
then energize the heater for a sufficient length of time
before restarting the operation.
•
Run each indoor unit one at a time and make sure the
corresponding outdoor 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 see if they operate properly.
NOTE
Cautions for normal operation check
•
Once stopped, the compressor will not restart in about 5
minutes even if the
On/Off
button of an indoor unit in the
same system is pressed.
•
When the system operation is stopped by the remote con-
trol, the outdoor units may continue to operate for a further
5 minutes.
•
If the system has not undergone any check operation by
the test operation button since it was first installed, an error
code [
U3
] is displayed. In this case, perform check opera-
tion referring to Section 8-2
Test Operation
,
•
After the test operation, when handing the unit over to the
customer, make sure the electric box lid, the service lid,
and the unit casing are all attached.
8.
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 lead-
ing 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 fol-
lowing standards may be applicable if local regulations are not
available.
The VRV System uses R-410A which is an entirely safe, non-
toxic, non-combustible refrigerant. However, care must be
taken to ensure that air-conditioning equipment is installed in
a large enough room to ensure that the maximum concentra-
tion level of refrigerant gas is not exceeded. This is a safe-
guard in the unlikely event of a major leak and complies with
local 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./ft3 ( the
weight in Ib. of the refrigerant gas in 1ft3 volume of the occu-
pied 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)
Installation error
Mal-
function
code
Solution
The stop valve of an
outdoor unit is left
closed.
E3
E4
F3
UF
Check referring to the table in
6-6 Additional Refrigerant
Charge
.
The phases of the
power to the outdoor
units are reversed.
U1
Exchange two of the three phases
(L1, L2, L3) to make a positive
phase connection.
No power is supplied to
an outdoor or indoor
unit (including phase
interruption).
U1
U4
Check if the power wiring for the
outdoor units are connected
correctly.
If the power wire is not connected
to L2 phase, no malfunction dis-
play will appear and the compres-
sor will not work.
Incorrect interconnec-
tions between units
UF
Check if the refrigerant line piping
and the unit wiring are consistent
with each other.
Refrigerant
overcharge
E3
F6
UF
Recalculate the required amount
of refrigerant from the piping
length and correct the refrigerant
charge level by recovering any
excessive refrigerant with a refrig-
erant recovery machine.
Insufficient
refrigerant
E4
F3
• Check if the additional refriger-
ant charge is correct. Recalcu-
late the required amount of
refrigerant from the piping
length and add an adequate
amount of refrigerant.
If an outdoor multi
terminal is connected
when there is one
outdoor unit installed.
U7
UF
Remove the line from the outdoor
multi terminals (Q1 and Q2).
The operation mode on
the remote controller
was changed before
the check run.
UF
E4
Set the operating mode on all
indoor unit remote controllers to
“cooling.”
The check operation
has not been
performed.
U3
Perform the check operation.
2
1