10
8. Test run
8.1. Before test run
s
After completing installation and the wiring and piping of the indoor and outdoor
units, check for refrigerant leakage, looseness in the power supply or control
wiring, wrong polarity, and no disconnection of one phase in the supply.
s
Use a 500-volt megohmmeter to check that the resistance between the power
supply terminals and ground is at least 1.0M
Ω
Ω
Ω
Ω
Ω
.
s
Do not carry out this test on the control wiring (low voltage circuit) terminals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1.0M
Ω
Ω
Ω
Ω
Ω
.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 M
Ω
due to refrigerant accumulat-
ing in the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. If the insulation resistance is below 1 M
Ω
, the compressor is faulty or the resist-
ance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm
up after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
•
The insulation resistance drops due to accumulation of refrigerant in the com-
pressor. The resistance will rise above 1 M
Ω
after the compressor is warmed
up for two to three hours.
(The time necessary to warm up the compressor varies according to atmos-
pheric conditions and refrigerant accumulation.)
•
To operate the compressor with refrigerant accumulated in the compressor,
the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 M
Ω
, the compressor is not faulty.
Caution:
• The compressor will not operate unless the power supply phase connection
is correct.
• Turn on the power at least 12 hours before starting operation.
• Starting operation immediately after turning on the main power switch can
result in severe damage to internal parts. Keep the power switch turned on
during the operational season.
s
The followings must be checked as well.
• The outdoor unit is not faulty. LED1 and LED2 on the control board of the outdoor
unit flash when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
• A protective sheet covers the surface of the DIP switch panel on the control board of
the outdoor unit. Remove the protective sheet to operate the DIP switches easily.
• Make sure that the all of the SW5 DIP switches for function changes on the control
board of the outdoor unit are set to OFF. If all of the SW5 switches are not set to
OFF, record the settings and then set all of the switches to OFF. Begin recovering
the refrigerant. After moving the unit to a new location and completing the test run,
set the SW5 switches to the previously recorded settings.
Unit replacement operation
s
When reusing existing pipes that carried R22 refrigerant, replacement op-
eration must be performed before performing a test run.
• If new pipes are used, these procedures are not necessary.
• If existing pipes that carried R22 refrigerant are used for the RP3 model, these
procedures are not necessary. (The replacement operation cannot be performed.)
Replacement operation procedures
1
Supply power.
2
Set DIP switch SW8-2 on the control board of the outdoor unit to ON to start
replacement operation.
* The replacement operation is performed using the cooling system. Cool air will
flow from the indoor unit during the replacement operation.
* During the replacement operation,
TEST RUN
is displayed on the remote controller
and LED1 and LED2 on the control board of the outdoor unit flash together.
3
Replacement operation requires at least two hours to complete.
* After setting switch SW8-2 to ON, the unit automatically stops after two hours.
* Replacement operation can be performed repeatedly by setting switch SW8-2
from OFF to ON. Wait at least two hours before starting replacement operation.
(If operation is started in less than two hours, the existing pipes will not be
cleaned and the unit may be damaged.)
4
Set switch SW8-2 to OFF. (Replacement operation is complete.)
* If the indoor temperature is less than 15°C, the compressor will operate inter-
mittently but the unit is not faulty.
Fig. 7-1
A
F
G
H
I
C
J
K
L
E
M
B
D
M
N
A
Indoor unit
B
Air intake duct flange
C
Drain pan
D
Air outlet duct flange
E
Electrical parts box
F
Air intake
G
Air outlet
H
Leave clearance to prevent
short cycle
I
Ceiling
J
Air intake (procure locally)
K
Air filter (procure locally)
L
Air intake duct (procure locally)
M
Canvas duct (procure locally)
N
Air outlet duct (procure locally)
O
Air outlet grille (procure locally)
Mode
Filter sign
Fan speed
No. of air outlets
Installed options (high-performance filter)
Up/down vane setting
Energy saving air flow
(Heating mode)
Settings
100Hr
2500Hr
No filter sign indicator
Standard (PLH/PLA)/Silent (PCH/PCA)
High ceiling
1
(PLH/PLA)/Standard (PCH/PCA)
High ceiling
2
(PLH/PLA)/High ceiling (PCH/PCA)
4 directions
3 directions
2 directions
Not supported
Supported
No vanes
Equipped with vanes (vanes angle setup
1
)
Equipped with vanes (vanes angle setup
2
)
Disabled
Enabled
Mode no.
Setting no. Initial setting
setting
1
07
2
3
1
08
2
–
3
1
09
2
–
3
10
1
–
2
11
1
2
–
3
12
1
–
2
Select unit numbers 01 to 03 or all units (AL [wired remote controller]/07 [wireless remote controller])
*1 When the power supply returns, the air conditioner will start 3 minutes later.
*2 Power failure automatic recovery initial setting depends on the connecting outdoor unit.
7. Duct work (Fig. 7-1)
Use the canvas duct for connecting the indoor unit and the duct.
Use fire-proof material for the duct parts.
Make sure that the duct has sufficient heat insulation.
Notes:
• An outlet duct of 850 mm or more is needed for construction.
• Connect the main body of the air conditioner and the duct so that their
potentials are equal.
• The standard external static pressure should be 125 Pa.
• Connect an earth cable
R
from the air intake duct
E
to the earth terminal
Q
.
Then, connect another earth cable
R
from the earth terminal
Q
to the air
outlet duct
F
.
6. Electrical work
