Mitsubishi Electric Mr.Slim PUZ-A NHA3 Serie Manual De Instalación página 10

7. Test run
7.2. Test run
7.2.1. Using SW4 in outdoor unit
1) PUZ Type
SW4-1 ON
Cooling operation
SW4-2 OFF
SW4-1 ON
Heating operation
SW4-2 ON
2) PUY Type
SW4-1 ON
Cooling operation
SW4-2 ON or OFF
* After performing the test run, set SW4-1 to OFF.
8. Special Functions
SW1
Circuit diagram example (low noise mode)
On-site arrangement
External input adapter (PAC-SC36NA-E)
SW2
Circuit diagram example
(Demand function)
On-site arrangement
8.3. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
Supply power (circuit breaker).
* When power is supplied, make sure that "CENTRALLY CONTROLLED" is not
displayed on the remote controller. If "CENTRALLY CONTROLLED" is dis-
played, the refrigerant collecting (pump down) cannot be completed normally.
* Start-up of the indoor-outdoor communication takes about 3 minutes after the
power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 min-
utes after the power (circuit breaker) is turned ON.
After the liquid stop valve is closed, set the SWP switch on the control board of
the outdoor unit to ON. The compressor (outdoor unit) and fans (indoor and out-
door units) start operating and refrigerant collecting operation begins. LED1 and
LED2 on the control board of the outdoor unit are lit.
* Only set the SWP switch (push-button type) to ON if the unit is stopped. How-
ever, even if the unit is stopped and the SWP switch is set to ON less than 3
minutes after the compressor stops, the refrigerant collecting operation cannot
be performed. Wait until compressor has been stopped for 3 minutes and then
set the SWP switch to ON again.
10
Red
Brown
Orange
Fig. 8-1
CNDM
Outdoor unit control board
Max. 10 m, 33 ft
Red
Brown
Fig. 8-2
Orange
CNDM
External input adapter
(PAC-SC36NA-E)
Outdoor unit control board
Max. 10 m, 33 ft
• 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 during
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.)
7.2.2. 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 capacity may be insufficient according to the outdoor temperature and condi-
tions, etc.
Complete the circuit as shown when using the external input adapter (PAC-
SC36NA-E). (Option)
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.
Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
By setting SW7-1 and SW7-2 on the control board of the outdoor unit, the ener-
gy consumption (compared to the normal consumption) can be limited as shown
below.
SW7-1 SW7-2
OFF OFF
ON OFF
OFF ON
Because the unit automatically stops in about 2 to 3 minutes when the refriger-
ant collecting operation is completed (LED1 off, LED2 lit), be sure to quickly
close the gas stop valve. If LED1 is lit and LED 2 is off and the outdoor unit is
stopped, refrigerant collection is not properly performed. Open the liquid stop
valve completely, and then repeat step 2 after 3 minutes have passed.
* If the refrigerant collecting operation has been completed normally (LED1 off,
LED2 lit), the unit will remain stopped until the power supply is turned off.
Turn off the power supply (circuit breaker).
* Note that when the extension piping is very long with large refrigerant amount,
it may not be possible to perform a pump-down operation. When performing
the pump-down operation, make sure that the low pressure is lowered to near
0 MPa (gauge).
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst if air etc. get into it.
Energy consumption (SW2 ON)
0% (Stop)
50%
75%