Installation manual

11
8. SpecialFunctions
8.1. Lownoisemode(on-sitemodication)(Fig.8-1)
By performing the following modication, operation noise of the outdoor unit can be
reduced by about 3-4 dB.
The low noise mode will be activated when a commercially available timer or the
contact input of an ON/OFF switch is added to the CNDM connector (option) on
the control board of the outdoor unit.
• The ability varies according to the outdoor temperature and conditions, etc.
1
Complete the circuit as shown when using the external input adapter (PAC-
SC36NA). (Option)
2
SW1 ON: Low noise mode
SW1 OFF: Normal operation
A
Circuit diagram example
(low noise mode)
B
On-site arrangement
C
External input adapter (PAC-SC36NA)
D
Outdoor unit control board
E
Max. 10 m
Red
A
SW1
CNDM
Fig.8-1
Brown
Orange
A
Circuit diagram example
(Demand function)
B
On-site arrangement
C
External input adapter (PAC-SC36NA)
D
Outdoor unit control board
E
Max. 10 m
8.2. Demandfunction(on-sitemodication)(Fig.8-2)
By performing the following modication, energy consumption can be reduced to 0
–100% of the normal consumption.
The demand function will be activated when a commercially available timer or the
contact input of an ON/OFF switch is added to the CNDM connector (option) on
the control board of the outdoor unit.
1
Complete the circuit as shown when using the external input adapter (PAC-
SC36NA). (Option)
2
By setting SW7-1 and SW7-2 on the control board of the outdoor unit, the
energy consumption (compared to the normal consumption) can be limited as
shown below.
SW7-1 SW7-2 Energy consumption (SW2 ON)
OFF OFF 0% (Stop)
ON OFF 50%
OFF ON 75%
A
SW2
CNDM
3
1
Fig.8-2
Red
Brown
Orange
3
1
7. Testrun
7.3. Testrun
7.3.1. UsingSW4inoutdoorunit
SW4-1 ON
Cooling operation
SW4-2 OFF
SW4-1 ON
Heating operation
SW4-2 ON
* After performing the test run, set SW4-1 to OFF.
• After power is supplied, a small clicking noise may be heard from the inside of
the outdoor unit. The electronic expansion valve is opening and closing. The unit
is not faulty.
• A few seconds after the compressor starts, a clanging noise may be heard from
the inside of the outdoor unit. The noise is coming from the check valve due to
the small difference in pressure in the pipes. The unit is not faulty.
Thetest run operation modecannotbechangedby DIPswitchSW4-2 dur
-
ingthetestrun.(Tochangethetestrunoperationmodeduringthetestrun,
stopthetestrunbyDIPswitchSW4-1.Afterchangingthetestrunoperation
mode,resumethetestrunbyswitchSW4-1.)
7.3.2. Usingremotecontroller
Refer to the indoor unit installation manual.
7.2. Unitreplacementoperation
► 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.
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 ow from the indoor unit during the replacement operation.
* During the replacement operation,
is displayed on the remote controller
and LED1 and LED2 on the control board of the outdoor unit ash together.
3
The duration of the replacement operation is determined by the length of the
piping. Always perform the replacement operation for longer than the stipulated
time.
* Use one of the following methods to complete the replacement operation.
When the replacement operation ends, the unit will automatically stop.
(1) Set SW8-2 from ON to OFF (when ending a replacement operation of less
than 2 hours).
• Because the replacement operation restarts each time SW8-2 is set from
OFF to ON, always perform the replacement operation for longer than the
stipulated time.
Required replacement operation times
Pipe Length Replacement Operation Time
0 to 20 meters 30 minutes or more
21 to 30 meters 45 minutes or more
31 to 50 meters 60 minutes or more
51 to 70 meters 100 minutes or more
(2) Allow the replacement operation to automatically stop after 2 hours (operation
stops while SW8-2 is still in the ON position).
• When the replacement operation has ended automatically after 2 hours of
operation, there is no need to set SW8-2 from ON to OFF; normal air condi-
tioning operation is possible with SW8-2 set to ON. However, to repeat the
replacement operation, SW8-2 rst has to be set to OFF and then to ON.
* If the indoor temperature is less than 15°C, the compressor will operate inter
-
mittently but the unit is not faulty.
BG79U791K01_en.indd 11 9/18/2007 3:43:23 PM