Table of Contents
Advertisement
7. Test run
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 flow from the indoor unit during the replacement operation.
* During the replacement operation,
and LED1 and LED2 on the control board of the outdoor unit flash 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.
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.
8. Special Functions
A
Orange
SW1
A Circuit diagram example
(low noise mode)
B On-site arrangement
A
Orange
SW2
A Circuit diagram example
(Demand function)
B On-site arrangement
is displayed on the remote controller
Red
3
Brown
Fig. 8-1
1
CNDM
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
E Max. 10 m
Red
3
Brown
Fig. 8-2
1
CNDM
C External input adapter (PAC-SC36NA)
D Outdoor unit control board
E Max. 10 m
(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
0 to 20 meters
21 to 30 meters
31 to 50 meters
51 to 70 meters
(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 first 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.
• 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.
8.1. Low noise mode (on-site modification) (Fig. 8-1)
By performing the following modification, 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
8.2. Demand function (on-site modification) (Fig. 8-2)
By performing the following modification, 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
OFF
OFF
ON
OFF
OFF
ON
Replacement Operation Time
30 minutes or more
45 minutes or more
60 minutes or more
100 minutes or more
Energy consumption (SW2 ON)
0% (Stop)
50%
75%
11
Advertisement
Table of Contents
