Special Functions - Mitsubishi Electric Mr. Slim PUHZ-HRP-HA2 Serie Manual De Instalación

9. Special Functions

X
X
SW1
Fig. 9-1
Circuit diagram example (low noise mode)
On-site arrangement
External input adapter (PAC-SC36NA)
X: Relay
Y
SW2
Y
Fig. 9-2
Circuit diagram example (Demand function)
On-site arrangement
External input adapter (PAC-SC36NA)
Y: Relay
9.3. 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
minutes 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 ventilators (indoor
and outdoor 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 can-
not be performed. Wait until compressor has been stopped for 3 minutes and
then set the SWP switch to ON again.
9.4 Setting the temperature of the ZUBADAN flash injection function
The ZUBADAN flash injection function achieves high heating performance at low outdoor temperatures.
• The SW9-3 and SW9-4 on the control board of the outdoor unit allow setting of the temperature available for the ZUBADAN flash injection function as shown in the below
table.
SW9-3 SW9-4
OFF OFF
OFF ON
ON OFF
ON ON
12
CNDM
Orange
1
Brown
Red
3
Outdoor unit control board
Max. 10 m
Power supply for relay
CNDM
Orange
1
Brown
Red
3
Outdoor unit control board
Max. 10 m
Power supply for relay
Outdoor temperatures
≤ 3˚C (Initial setting)
≤ 0˚C
≤ –3˚C
≤ –6˚C
9.1. Low noise mode (on-site modification) (Fig. 9-1)
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.
Complete the circuit as shown when using the external input adapter
(PAC-SC36NA). (Option)
SW1 ON: Low noise mode
SW1 OFF: Normal operation
Note:
When the Dip SW9-1 on the control board of the outdoor unit is ON, set Dip
SW9-1 to OFF.
9.2. Demand function (on-site modification) (Fig. 9-2)
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). (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 LED2 is off and the outdoor unit is
stopped, refrigerant collection is not properly performed. Open the liquid stop
valve completely, and then repeat step
* 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%
after 3 minutes have passed.