Hitachi UTOPIA RAS-4HVRP2E - Page 151

7 Commissioning
Test run from the outdoor unit
SMGB0136 rev.0 - 07/2021
149
7
Setting the DSW
DSW301 for 3HP
DSW1 for 4-6HP
Operation Remarks
Test run
1. Setting the operation mode.
Cooling: Set DSW PIN2 OFF
Heating: Set DSW PIN2 ON
2. Start of the test run.
Set DSW PIN1 ON and the operation
starts after approximately 20 seconds.
? NOTE
In the heating mode, leave DSW-PIN2
in the ON position.
1. The indoor unit automatically
starts operating when the test run
of the outdoor unit is set.
2.TheON/OFFcanbeperformed
from the remote control or DSW
PIN1 on the outdoor unit.
3. The operation continues for 2
hours without Thermo-OFF.
Note that the indoor units operate in
conjunction with the test run operation
of the outdoor unit.
If the test run is started from the
outdoor unit and stopped from the
remote control switch, the test run
function of the remote control switch is
cancelled. However, the test run of the
outdoor unit is not cancelled. Check
that DSW PIN1 of the outdoor unit
PCB1 is turned OFF.
In the case that several indoor units
are connected with one remote
control, perform the test run operation
individually for each refrigerant system
one by one. Then, make sure to turn
the power source OFF for the indoor
units in other refrigerant systems not to
operate test run.
Outdoor unit
Power OFF
Test RUN
Indoor
Unit
The setting of DSW is not required for
the test run from the remote control
switch.
Manual
OFF of the
compressor
1. Setting. Compressor manual OFF
set DSW PIN4 to the ON position.
2. Reset. Compressor ON: set DSW
PIN4 in the OFF position.
1. When DSW PIN4 is ON during
the compressor operation, the
compressor stops operating
immediatly and the indoor unit is
under the condition of Thermo-
OFF.
2. When DSW PIN4 is OFF, the
compressor starts to operating
after the cancellation of 3-minutes
guard.
DonotrepeatthecompressorON/OFF
with frequency.
Manual
defrost
1. Manual defrost operation. Press
PSW1 more than 3 seconds during the
heating operation, and the defrosting
operation is started after 2 minutes.
This function is not available within
5 minutes after starting heating
operation.
2. Manual defrost operation completion.
Defrosting operation automatically ends
and the heating operation restarts.
1. Defrost operation is available
regardless of the frost condition
and total time of the heating
operation.
2. Defrost operation is not
performed when the temperature
of outdoor unit heat exchanger is
higher than 10 °C, high pressure is
higher than 3.2 MPa or the unit is
Thermo-OFF .
Do not repeat defrosting operation
frequently.
When manual defrosting operation is
accepted by PSW5 or PSW1, the time
left before starting defrosting operation
is indicated on the 7-segment indicator
on the PCB.
When the test run operation is completed, turn all pins in the DSW to OFF.
1 If the remote control switch is set to a different mode, the test run function will not start. In this case, perform the
following actions before the test run.
- Wired remote Control Switch: STOP
- Central Station: STOP and Remote Control Switch is available mode.
- COOL/HEATChangeoverSwitch:ConnectorCN1ofoutdoorunitPCBisopened.
- Duringthetestrunmode,donotcontrolthewiredremotecontrolswitch,thecentralstationandcool/heat
changeover switch. Otherwise, the operation mode will be changed or the test run will be ended. If necessary,
control them after the test run is completed.
2 If an alarm code is indicated during the test run, reset the system by turning the main power supply off then back on.
The system should then operate.