18
8-2 Test operation
NOTE
After completing installation, be sure to open the valves. (Operat-
ing the unit with the valves shut will break the compressor.)
Power supply connection
When running the unit for the first time after installation, be sure to per-
form a test operation following these steps. (Not performing a test oper-
ation when the unit is first installed may prevent the unit from operating
properly.)
•
During the operation, monitor the outdoor unit operation status and
check for any incorrect wiring.
(Refer to figure 19)
1.
Electric box lid
2.
Service lid
3.
[Service precautions] Label location
〈〈〈〈
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
display shows the contents of the table in “8-2 Test operation 2.”.
•
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.
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 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 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 stopping, 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 controller, the
outdoor units may continue operating for more 5 minutes at maxi-
mum.
•
If the system has not undergone any check operation by the test
operation button since it was first installed, an error code “U3” is dis-
played. In this case, perform check operation referring to “
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.
1. Turn ON the power to the outdoor
units and indoor units.
3.
.
As necessary, configure the system
settings onsite by using the dipswitch
(DS1) on the outdoor unit PC-Board
(A1P) and push button switches
(BS1 to 5).
.
When the system is in the multiple-
outdoor unit configuration (Out Multi),
perform the configuration on the parent
unit. (Any settings made on a child unit
will be ignored.)
Always perform configuration after turning ON the
power. To learn the setting method, refer to the
[Service Precautions] label attached at the
position shown in the figure on the right
(Electric box lid in outdoor unit).
(Remember, the actual settings you have made
must be recorded on the [Service Precautions]
label.)
2. Check the LED on the PC Board (A1P) in the outdoor unit to see if the data transmission
is performed normally.
Make sure to turn ON the power 6 hours before
starting the operation. This is necessary to warm
the crankcase preliminarily by the electric heater.
LED display
(Default status
before delivery)
One outdoor unit installed
When multiple
outdoor units
installed (
∗
)
Master station
Sub station
Microcomputer
operation
monitor
Page
HAP
H1P
H2P
H3P
H4P
H5P
H6P
H7P
H8P
Ready/
Error
Cooler/heater changeover
Individual
Bulk
(parent)
Bulk
(child)
Low
noise
Demand
Multi
LED display:
OFF
ON
Blinking
(
∗
) The base (parent) unit is the outdoor unit to which the interconnecting wiring for the
indoor units is connected. The other outdoor units are child units.
4. Check if the shutoff valves are in
appropriate status and correct any
wrong status. (Refer to the table in
“
6-6 Additional Refrigerant Charge
”.)
5. Perform the check operation
following the instructions printed
on the [Service Precaution] label.
Do not leave any shutoff valve closed.
Otherwise the compressor will fail.
The system operates for about 15 minutes
(30 minutes at maximum) and automatically
stops the test operation. The system can start a
normal operation about 15 minutes after the test
operation, only if the remote controller displays
no error codes.
Caution
Installation error
Malfunc-
tion code
Solution
The stop valve of an out-
door 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 inter-
ruption).
U1
U4
Check if the power wiring for the
outdoor units are connected
correctly.
(If the power wire is not con-
nected to L2 phase, no malfunc-
tion display will appear and the
compressor will not work.)
Incorrect interconnec-
tions between units
UF
Check if the refrigerant line pip-
ing and the unit wiring are consis-
tent 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
refrigerant recovery machine.
Insufficient
refrigerant
E4
F3
• Check if the additional refriger-
ant charge has been finished
correctly.
• Recalculate the required
amount of refrigerant from the
piping length and add an ade-
quate amount of refrigerant.
If an outdoor multi
terminal is connected
when there is one
outdoor unit installed
U7
UF
Remove the line from the out-
door multi terminals (Q1 and
Q2).
The check operation has
not been performed.
U3
Perform the check operation.
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